VARIABLE SPEED WIND TURBINE HAVING A PASSIVE GRID SIDE RECTIFIER WITH SCALAR POWER CONTROL AND DEPENDENT PITCH CONTROL

A variable speed wind turbine having a passive grid side rectifier using scalar power control and dependent pitch control is disclosed. The variable speed turbine may include an electrical generator to provide power for a power grid and a power conversion system coupled to the electrical generator. The power conversion system may include at least one passive grid side rectifier. The power conversion system may provide power to the electrical generator using the passive grid side rectifier. The variable speed wind turbine may also use scalar power control to provide more precise control of electrical quantities on the power grid. The variable speed wind turbine may further use dependent pitch control to improve responsiveness of the wind turbine.

POWER GENERATION SYSTEM INCORPORATING A VANADIUM REDOX BATTERY AND A DIRECT WIND TURBINE GENERATOR

METHOD FOR OPERATING A WIND TURBINE DURING A DISTURBANCE IN THE GRID

There is provided a method of operating a wind power installation. Under first operating conditions in a normal operating mode the wind power installation delivers a first power to a connected electrical network. That first power is proportional to the wind speed. The wind power installation is controlled in such a way that upon the occurrence of a disturbance it remains on the connected electrical network and delivers to the connected electrical network a second power which is lower than the first power. Upon cessation of the disturbance and under the first operating conditions a third power is briefly delivered to the connected electrical network, the third power being significantly higher than the first power.

METHOD FOR THE OPERATION OF A WIND ENERGY PLANT AT SUDDEN VOLTAGE CHANGES IN THE GRID

СПОСОБ И УСТРОЙСТВО ДЛЯ НАБЛЮДЕНИЯ СОСТОЯНИЯ СЕТИ

Предложенное изобретение относится к способу для определения электрических параметров трехфазной сети переменного напряжения с первой, второй и третьей фазой, содержащему этапы измерения соответствующего значения напряжения первой, второй и третьей фаз по отношению к нейтральному проводнику в первый момент времени, преобразования трех значений напряжения в первый момент времени в полярные координаты с амплитудой напряжения и фазовым углом, повторения измерения и преобразования по меньшей мере для одного другого момента времени и определения текущей частоты, амплитуды напряжения и/или фазового угла по меньшей мере одной из фаз из преобразованных в полярные координаты значений напряжения.

System and method for improving power grid stability

A control system including a drop control device coupled between a power grid and a power storage device is provided. The drop control device is configured to distribute power at selected amperage to the power storage device based on a present frequency of power produced by the power grid.

Power system frequency inertia for power generation system

METHOD OF REGULATION OF the POWER Of an INSTALLATION OF ENERGY TRANSFORMATION AND INSTALLATION OF ENERGY TRANSFORMATION PILOTEE BY SUCH a METHOD

ARRANGEMENT FOR FEEDING ELECTRICAL ENERGY INTO AN ENERGY SUPPLY NETWORK

The invention relates to an arrangement (10) for feeding electrical energy into an energy supply network (100). According to the invention, the arrangement has a generator (20) having potential-separated winding systems (30), the arrangement has at least two frequency converters (40, 41, 42) having separated intermediate circuits (60), wherein each frequency converter is connected indirectly or directly to a winding system (30) of the generator, the arrangement has at least one control device (80), to which the frequency converters are connected in order for the frequency converters to be controlled, and the frequency converters feed current into the energy supply network (100) by means of a voltage having a multi-level characteristic when controlled by the control device.

A SYSTEM FOR GENERATING ELECTRIC ENERGY

The invention relates to a system for generating electric energy from renewabie energy sources. The system includes a plurality of generator aggregates (4a-6c) arranged in the sea and a plurality of switchgears (1 a-1 c) arranged in the sea. Each switchgear (1 a-1 c) is connected to a plurality of the generator aggregates (4a-6c). According to the invention the system includes a plurality of primary intermediate stations (17a-17c). The system also includes at least one secondary intermediate station (19). Each primary intermediate station (17a-17c) is connected to a plurality of the switchgears and each secondary intermediate station (19) is connected to a plurality of the primary intermediate stations (17a-17c). The secondary intermediate station is also connected to a land based electric network. Switching means (192) is present for allowing selective connection to various locations (193,194,195) in the electric network.The invention also relates to an electric network and to a method ...

ENERGY ARBITAGE USING ENERGY PRICE FORECAST AND WIND POWER FORECAST

Embodiments of the invention generally relate to wind power plants, and particularly to controllers and control algorithms for wind power plants incorporating an energy storage system. A controller may periodically retrieve wind forecast and energy price forecast data and cause the energy storage system to be charged or discharged based on the forecast data in a manner that increases revenue and reduces cost for the wind power plant operator.

WIND TURBINE DIRECT CURRENT CONTROL SYSTEM AND METHODS

A wind turbine control system converts AC power generated by the wind turbine to DC power for use in a load. The control system may include a plurality of modules that convert the AC power to DC power. The control system may include a turbine module that converts the AC power produced by a generator of the wind turbine to DC power. The turbine module may also include a boost converter that boosts the DC current to a higher voltage that improves efficient transfer of the DC power to the load. The control system may further include an output module having a buck converter that bucks the voltage of the DC power to a level needed for use by the load. The control system may control the amount of power generated by the wind turbine based on power needs of the load.

WIND ENERGY INSTALLATION

The invention relates to a wind energy installation, in particular to a wind energy installation comprising a device for dehumidifying a gaseous medium in an essentially enclosed chamber inside said wind energy installation. The aim of the invention is to minimise the human and logistical resources required to maintain the functional capacity of the device and to simplify the construction of the device, to achieve a virtually maintenance-free operation. To achieve this, the device comprises a first planar element (10) and a cooling device (12) for cooling the first element to a temperature below the ambient temperature.

METHOD FOR OPERATING A WIND TURBINE DURING A DISTURBANCE IN THE GRID

The invention relates to a method for operating a wind turbine. In first operating conditions in a normal mode, said wind turbine delivers a first output to a connected electricity grid, said first output being proportional to the wind speed. The wind turbine is controlled in such a way that it remains connected to the electricity grid during a disturbance, delivering a second output to the connected electricity grid, said output being lower than the first. Once the disturbance has ceased, a third output of short duration is delivered to the connected electricity grid in the first operating conditions, said third output being significantly higher than the first.

METHOD, SYSTEM, AND COMPUTER PROGRAM PRODUCT TO OPTIMIZE POWER PLANT OUTPUT AND OPERATION

Method, power plant, and computer program product for use in optimizing power plant power and operation. The power plant includes a wind farm, an energy storage system, and a supervisory controller implementing a control algorithm that receives information on the wind farm and on the energy storage and, based on that information, computes a power reference for the wind farm and a power reference for the energy storage. These power references optimize a given power plant objective subject to a given set of constraints on the power plant.

Adjusting pitch of wind turbine blades in emergency situation.

Die Erfindung betrifft eine Vorrichtung zum Verstellen von Rotorblättern einer Windkraftanlage mit einem Verstellmotor und mit einer Notstromversorgungseinrichtung enthaltend einen Energiespeicher, der im Notfallbetrieb mit dem Verstellmotor verbindbar ist zur Wahlstellung der für eine Verstellung der Rotorblätter in eine Fahnenstellung derselben erforderlichen elektrischen Energie, wobei die Notstromversorgungseinrichtung (2) mit einer Netzstromversorgungseinrichtung (1) gekoppelt ist, die für den elektrischen Energiefluss von einem Stromnetz zu dem Verstellmotor (3) einen stromnetzseitigen Gleichrichter (4), einen demselben nachgeordneten Zwischenkreis (5) und einem demselben nachgeordneten Wechselrichter (6) aufweist, und dass der Energiespeicher (8) mittels eines Wandlers (9) an dem Zwischenkreis (5) der Netzstromversorgungseinrichtung (2) gekoppelt ist, derart, dass im Notfallbetrieb zumindest eine im Normalbetrieb am Zwischenkreis (5) anliegende Zwischenkreisnennspannung (Uz) bereitgestellt ...

WIND TURBINE GENERATOR

It is an object to provide a wind turbine generator system that can promptly restore the system voltage in the event of, for example, a low voltage phenomenon. A controller 21 detects the power factor state of a generator when a normal operation mode is switched to a low-voltage control mode and sets a condition for switching from the low-voltage control mode to the normal operation mode depending on the detected power factor state.

ASYNCHRONOUS GENERATOR SYSTEM AND WIND TURBINE HAVING AN ASYNCHRONOUS GENERATOR SYSTEM

Wind energy plant and method for operating a wind energy plant

Control of wind power generator plant feeding grid, regulates power delivery as a function of measured grid frequency Power delivered from the generator to the grid is regulated or adjusted as a function of grid frequency.

METHOD FOR OPERATING A WIND POWER STATION AND WIND POWER STATION

The present invention concerns a method of operating a wind power installation having an electrical generator drivable by a rotor for delivering electrical power to an electrical network to which the wind power installation is connected. The invention further concerns a wind power installation comprising a rotor and an electrical generator coupled to the rotor for delivering electrical power to an electrical consumer, in particular an electrical network. The object of the present invention is to eliminate the above-described problems when wind power installations are connected to the electrical network. A method of operating a wind power installation having a generator for delivering electrical power to an electrical network characterised in that the power delivered to the network by the generator is regulated or adjusted in dependence on the network frequency of the electrical network.

CIRCUIT ARRANGEMENT FOR USE IN A WIND ENERGY INSTALLATION

The invention relates to a circuit with a variable rotational speed to be used particularly in a wind power plant, comprising a double fed asynchronous generator (DASM), a crow-bar, an additional resistor (R15) and a converter. In order to meet the requirements of the network provider, whereby a particularly permanent coupling to the network should be ensured so that the wind power plant can start up and stabilize the network during and after medium voltage short circuit in the network, the additional resistor can be regulated with the aid of a fast switch in such a way that the converter can be provisionally disconnected at least partly in case of a short circuit in the network. The rotor current is momentarily assumed by the additional resistor and disconnected after the rotor short circuit current dies out so that the converter can be subsequently connected once again and so that it can supply the desired active short circuit current to the network.

ELECTRICAL POWER TRANSMISSION SYSTEM

The invention relates to an electrical power transmission system for transmitting electrical power from a generator (2) generating a first inverter voltage to an electrical alternating voltage network (20) via a transmission line (14). Said transmission system comprises a circuit arrangement (4, 6, 8, 10, 12) which converts the first alternating voltage generated by the generator (2) into a first direct voltage and feeds it into the transmission line (14). The system is also provided with a first inverter (18) which is connected to the output of the transmission line (14). Said inverter converts the first direct voltage into a second alternating voltage and feeds it into the alternating voltage network (20). One of the advantages of the invention is that it provides a circuit arrangement (4, 6, 8, 10, 12) which has a converter connection (4, 6, 8) which converts the first alternating voltage generated by the generator (2) into a third alternating voltage. The invention additionally provides ...

A VARIABLE ROTOR SPEED WIND TURBINE, WIND PARK, METHOD OF TRANSMITTING ELECTRIC POWER AND METHOD OF SERVICING OR INSPECTING A VARIABLE ROTOR SPEED WIND TURBINE

The invention relates to a variable rotor speed wind turbine (1) transmitting AC electric power to a utility grid (13). The wind turbine comprises at least one AC generator (7) and at least one power electronic converter unit (10). Further, it comprises means (10, 15, 20) for transforming at least one nominal output value of said generator to at least one different nominal input value of said at least one power electronic converter unit. The invention also relates to a wind park and a method of transmitting AC electric power to a utility grid (13) from a variable rotor speed wind turbine (1) as well as a method of servicing or inspecting a variable rotor speed wind turbine.

METHOD FOR CONTROLLING AND ADJUSTING A WIND TURBINE

Wind-power production with reduced power fluctuations

A method of operating at partial load a wind turbine (1) supplying electrical power to an electrical grid (20) includes monitoring stability of the grid; and upon detection of a reduced grid stability, changing operation of the wind turbine by limiting wind-caused fluctuations of the active-power supply to the electrical grid, or by reducing an already existing limit to fluctuations of the active-power supply.

Utility grid, controller, and method for controlling the power generation in a utility grid

Refundant electrical brake and protection system for electric generators

Ejection industrial electric power system

Method and apparatus for converting wind generated electricity to constant frequency electricity for a utility grid

SYSTEME ELECTRIQUE MU PAR L'ENERGIE EOLIENNE

L'invention a trait à un système électrique mû par l'énergie éolienne. Elle a pour objet un tel système, comportant une hélice mue par le vent et couplée mécaniquement à une machine électrique reliée à un système alternatif ou triphasé. Ledit système est conçu de sorte que la vitesse de l'hélice est inférieure à la vitesse de fonctionnement de la machine électrique, cette dernière est alimentée à partir du système, et lorsque la vitesse de l'hélice est supérieure à la vitesse de fonctionnement de la machine électrique, cette dernière délivre de l'énergie au système. Application : transformation d'énergie éolienne en énergie électrique.

WIND-DRIVEN GENERATOR, CONTROL METHOD OF THE SAME AND WIND-DRIVEN GENERATING SYSTEM

SELECTIVE DROOP RESPONSE CONTROL FOR A WIND TURBINE POWER PLANT

A power plant controller is described. The power plant controller controls a power generation system having one or more power generators and an energy storage system, and provides a utility grid or transmission system operator with the capability to select the droop response provided by the power generation system. Accordingly, an operator can request a specific generator droop response in order to provide appropriate frequency and grid control services. The power plant controller operates in real time determining one or more power characteristics of the power generation system. Based on these characteristics and an indication of a future predicted power output for the power generation system, the power plant controller can take the necessary steps to ensure that the power generation system is capable of responding with the selected droop response, or can advise the operator that a different droop is preferred.

A POWER GENERATION UNIT AND A METHOD FOR GENERATING ELECTRIC ENERGY

The invention relates to a power generation unit. The unit has a turbine (3), a generator (8) and an electric connection means (9 -12) connecting the generator (6) to an electric network (2). According to the invention the generator (8) is a permanent magnet synchronous generator, which has a low load angle. The electric connection means includes a diode rectifier (9) for supplying DC-voltage. The invention also relates to a use of the invented power generation unit and to a method for generating electric energy.

BLADE ANGLE ADJUSTMENT DRIVE FOR A WIND TURBINE

The invention relates to a blade angle adjustment drive for a wind turbine, comprising at least one electric inverter (13), at least one electric motor (20) that is electrically coupled to the inverter (13) and that is or can be fed by the inverter (13), at least one monitoring unit (26) by means of which the electric output current (IM) supplied by the inverter (13) to the electric motor (20) is or can be monitored and a load state of the inverter (13) is or can be determined depending thereon, at least one current limiting unit (30) by means of which in an overloaded state of the inverter (13) the maximum possible output current (IM) is or can be reduced to a nominal current (IN) that is less than a peak current (IS) that the inverter (13) provides or can provide as the maximum possible output current (IM) in a non-overloaded state, and at least one additional unit (28) that can be activated. When activated, the peak current is or can be provided as the maximum possible output current ...

OVERHEAD LINE SECTION AND A METHOD FOR ERECTING AN OVERHEAD LINE SECTION

The invention relates to a method for erecting an overhead line section, comprising the steps of a. erecting a plurality of overhead line masts, b. connecting the overhead line masts using a high-voltage line which leads to one overhead line mast that is arranged first in the overhead line section, interconnects said first overhead line mast to the further overhead line masts, and leads away from the overhead line mast which is arranged last in the overhead line section, c. arranging a plurality of wind turbines on at least some of the overhead line masts, and d. interconnecting said wind turbines using a medium voltage line that leads away from at least one overhead line mast arranged in the overhead line section, the order of steps b, c, and d being optional.

METHOD OF CONTROLLING A VARIABLE SPEED WIND TURBINE GENERATOR

In a method of controlling a variable speed wind turbine generator connected to a power grid and comprising means for controlling the generator speed, said method comprises the steps of - measuring the frequency f of the power grid, - controlling the speed of the generator for optimizing the power delivered to the power grid, - setting limits for the generator speed. The setting of the limits for the generator speed is performed in dependency of the measured frequency of the power grid. This provides a dynamical set of limits providing improved possibilities of optimizing the power production.

METHOD FOR OPERATING A WIND ENERGY SYSTEM IN CASE OF OVERVOLTAGE IN THE GRID

The invention relates to a method for operating a wind energy system (15-19) comprising an electrical generator (30) driven by a rotor (25-29) for outputting electrical power to an electrical grid (31) allowing for a grid voltage, wherein idle power from the wind energy system (15-19) is fed into the grid (31) if overvoltage is present in the grid (31) in order to reduce the voltage. The invention further relates to a wind energy system (15-19) comprising an electrical generator (30) driven by a rotor for outputting electrical power to an electrical grid (31), wherein idle power from the wind energy system (15-19) can be fed into the grid (31) if overvoltage is present in the grid in order to reduce the voltage. The method according to the invention is characterized in that it is monitored whether a voltage has been lowered to a prescribable target value within a prescribable time and/or idle current has been output that is greater than or equal to a prescribable idle current target value ...

IMPROVED FREQUENCY CONTROL

The present invention relates to a method for controlling a fundamental frequency of power supply grid being operatively connected to a power supply grid, the method comprising the steps of determining a steady-state and/or a dynamic-state related parameter of the associated power supply grid, and applying said determined parameter(s) in a frequency 5 controller of the wind turbine facility in order to improve frequency control of the fundamental frequency of the power supply grid.

AN EARTHING SYSTEM FOR A WIND TURBINE CONNECTED TO A UTILITY GRID AND FOR A WIND TURBINE PARK

The invention relates to an earthing system for a wind turbine connected to a utility grid. The wind turbine comprises at least one electric system such as low or high voltage power systems and cables (16), at least one control system such as a SCADA system and control cables (18), and/or at least one safety system such as a lightning protection system, wherein a connection to an electrically earth potential is established from one defined place (12) within the wind turbine for said systems. In another embodiment, a wind turbine comprises at least two electric systems such as a lightning protection system and a low or high voltage power system, an electrically earth potential established by at least one foundation earthing (8) including at least one earthing wire embedded partly or totally in the wind turbine foundation (6), and at least one electric conducting means (9) extending radial from said wind turbine (1) into the ground, wherein a connection to said electrically earth potential ...

METHOD FOR A TENSION PROOF CLOSURE OF THE END OF AN ENERGY CABLE, AND DEVICE MANUFACTURED BY THE METHOD

A method for the tension proof closing of the end of an energy cable in which an energy cable is used whose center axis containing the electrical transmission elements is surrounded by a tension proof reinforcement of metal wires. Initially, the reinforcement at the end of the energy cable is removed over a predetermined length. Subsequently, a pipe piece of metal, which tightly surrounds the end of the remaining reinforcement, is placed onto the end of the remaining reinforcement. Finally, a cup shaped tubular elongated sleeve of metal is pushed onto the end of the energy cable and is connected in a tension proof manner to the pipe piece which has, at its free end facing away from the pipe piece, a device suitable for mounting a tension element. In addition, a device manufactured by the method is proposed.

Electrical Generation System

An electrical generation system includes a plurality of wind generators. Each of the wind generators extends upwardly out of a body of water. Each of the wind generators is rotated by wind thereby facilitating each of the wind generators to generate electricity. A platform is slidably coupled to each of the wind generators. The platform travels upwardly and downwardly along the wind generator when the body of water raises and lowers. A plurality of motion units is operationally coupled between an associated one of the wind generator and the platform. Each of the motion units converts the upward and downward motion of the platform into electrical energy. A plurality of solar cells is coupled to the platform to convert sunlight into electricity. 1. An electrical generation system comprising:a plurality of wind generators, each of said wind generators being configured to engage a bottom of a body of water and extend upwardly out of the body of water such that each said wind generator remains in a static position relative to movement of the body of water, each of said wind generators being configured to be rotated by wind thereby facilitating each of said wind generators to generate electricity, each of said wind generators being configured to be electrically coupled to a power distribution system;a platform being slidably coupled to each of said wind generators, said platform being comprised of a buoyant material wherein said platform is configured to travel upwardly and downwardly along said wind generator when the body of water raises and lowers;a plurality of motion units, each of said motion units being operationally coupled between an associated one of said wind generators and said platform wherein each of said motion units is configured to convert the upward and downward motion of said platform into electrical energy; anda plurality of solar cells, each of said solar cells being coupled to said platform wherein each of said solar cells is configured to be exposed ...

METHOD FOR MAINTAINING FLOATING-BODY TYPE WIND TURBINE POWER GENERATING APPARATUS

A method of maintaining a power generating apparatus includes a separation step of separating a mooring line and a cable from a floating body of a first floating-body type wind turbine power generating apparatus including a maintenance-target section; a retention step of retaining the mooring line and the cable by a floating-body structure, after the separation step; a first transfer step of transferring the first floating-body type wind turbine power generating apparatus from the mooring position, after the separation step; a second transfer step of transferring a second floating-body type wind turbine power generating apparatus having no maintenance-target section to the mooring position; and a connection step of detaching the mooring line and the cable from the floating-body structure and connecting the mooring line and the cable to the second floating-body type wind turbine power generating apparatus, after the second transfer step. 1. A method of maintaining a floating-body type wind turbine power generating apparatus including a wind turbine generator disposed on a floating body moored at a mooring position by a mooring line , the floating-body type wind turbine power generating apparatus being configured to supply electric power generated by the wind turbine generator to a cable , the method comprising:a separation step of separating the mooring line and the cable from the floating body of a first floating-body type wind turbine power generating apparatus including a maintenance-target section;a retention step of retaining the mooring line and the cable by a floating-body structure, after the separation step;a first transfer step of transferring the first floating-body type wind turbine power generating apparatus from the mooring position, after the separation step;a second transfer step of transferring a second floating-body type wind turbine power generating apparatus having no maintenance-target section to the mooring position; anda connection step of ...

METHOD OF OPERATING A WIND TURBINE AS WELL AS A SYSTEM SUITABLE THEREFORE

According to an embodiment of the present invention, a method of operating a wind turbine including a power generator, a generator/machine side converter connected to the power generator, a grid/line side converter connected to a power grid through power components, and a DC-link connected between the machine side converter and the line side converter, comprises: Monitoring the power grid for overvoltage events; if an overvoltage event is detected disabling active operation of the machine side converter and of the line side converter, enabling an AC-load dump connected between the machine side converter and the power generator in order to dissipate active power output by the power generator into the AC-load dump, waiting for a waiting period, and enabling active operation of the line side converter and the machine side converter if the overvoltage ends within the waiting period. 1. A method of operating a wind turbine comprising a power generator , a machine side converter connected to the power generator , a line side converter connected to a power grid through the power components , and a DC-link connected between the machine side converter and the line side converter , the method comprising:monitoring the power grid for overvoltage events, disabling active operation of the machine side converter and of the line side converter,', 'enabling an AC load dump connected between the machine side converter and the power generator in order to dissipate power output from the power generator into the AC load dump,', 'waiting for a waiting period, and', 'enabling active operation of the line side converter and the machine side converter if the overvoltage event ends within the waiting period., 'if an overvoltage event is detected,'}2. The method according to claim 1 , wherein the duration of the waiting period is dynamically set depending on the overvoltage detected.3. The method according to further comprising:monitoring whether, due to the overvoltage event, the DC-link ...

WIND POWER PLANT COMPRISING A REACTIVE POWER MODULE FOR SUPPORTING A POWER SUPPLY SYSTEM AND CORRESPONDING METHOD

CONTROL DEVICE FOR WIND POWER SYSTEMS HAVING POWER FAILURE DETECTION

Method of operating a wind energy plant

Verfahren zum Betreiben einer Windenergieanlage mit einem Generator, der zum Einspeisen von elektrischer Leistung an ein elektrisches Netz angeschlossen ist, dadurch gekennzeichnet, daß eine Steuereinheit vorgesehen ist, die während des generatorischen Betriebs auf ein erstes Umschaltsignal ansprechend den Generator in einen motorischen Betrieb umschaltet.

Wind power installation and method of operating it

The purpose of the invention is to reduce the contribution of wind power installations to frequency errors on the grid, and preferably to contribute to the elimination of such errors. Thus, the method involves the use of PID control and/or control with hysteresis so as to regulate the active power injected into the grid, in view of the deviation between a measured grid frequency and the nominal grid frequency.

WIND POWER PLANT

A wind power plant where the driving shaft communicates with a synchronous generator (3) optionally through a gear (2) and with a transformer, if any, communicating through an AC/DC inverter 7 with an HVDC transmission cable 9. The synchronous generator (3) is connected to a magnetic field controller (3). In response to an output parameter, such as the power generated by the synchronous generator (3), this magnetic field controller (4) is adapted to vary the magnetic field in the generator (3) in response to said output parameter. As a result it is possible to compensate for a possible variation in the output parameter, whereby said output parameter is stabilized. As a result it is possible to compensate for a varying speed of rotation.

ELECTRICAL POWER TRANSMISSION SYSTEM

The invention relates to an electrical power transmission system for transmitting electrical power from a generator (2) generating a first inverter voltage to an electrical alternating voltage network (20) via a transmission line (14). Said transmission system comprises a circuit arrangement (4, 6, 8, 10, 12) which converts the first alternating voltage generated by the generator (2) into a first direct voltage and feeds it into the transmission line (14). The system is also provided with a first inverter (18) which is connected to the output of the transmission line (14). Said inverter converts the first direct voltage into a second alternating voltage and feeds it into the alternating voltage network (20). One of the advantages of the invention is that it provides a circuit arrangement (4, 6, 8, 10, 12) which has a converter connection (4, 6, 8) which converts the first alternating voltage generated by the generator (2) into a third alternating voltage. The invention additionally provides ...

WIND POWER PLANT

A wind power plant where the driving shaft communicates with a synchronous generator (3) optionally through a gear (2) and with a transformer, if any, communicating through an AC/DC inverter 7 with an HVDC transmission cable 9. The synchronous generator (3) is connected to a magnetic field controller (3). In response to an output parameter, such as the power generated by the synchronous generator (3), this magnetic field controller (4) is adapted to vary the magnetic field in the generator (3) in response to said output parameter. As a result it is possible to compensate for a possible variation in the output parameter, whereby said output parameter is stabilized. As a result it is possible to compensate for a varying speed of rotation.

METHOD FOR OPERATING A WIND POWER STATION AND WIND POWER STATION

The present invention concerns a method of operating a wind power installation having an electrical generator drivable by a rotor for delivering electrical power to an electrical network to which the wind power installation is connected. The invention further concerns a wind power installation comprising a rotor and an electrical generator coupled to the rotor for delivering electrical power to an electrical consumer, in particular an electrical network. The object of the present invention is to eliminate the above- described problems when wind power installations are connected to the electrical network. A method of operating a wind power installation having a generator for delivering electrical power to an electrical network characterised in that the power delivered to the network by the generator is regulated or adjusted in dependence on the network frequency of the electrical network.

CIRCUIT TO BE USED IN A WIND POWER PLANT

The invention relates to a circuit with a variable rotational speed to be used particularly in a wind power plant, comprising a double fed asynchronous generator (DASM), a crow-bar, an additional resistor (R15) and a converter. In order to meet the requirements of the network provider, whereby a particularly permanent coupling to the network should be ensured so that the wind power plant can start up and stabilize the network during and after medium voltage short circuit in the network, the additional resistor can be regulated with the aid of a fast switch in such a way that the converter can be provisionally disconnected at least partly in case of a short circuit in the network. The rotor current is momentarily assumed by the additional resistor and disconnected after the rotor short circuit current dies out so that the converter can be subsequently connected once again and so that it can supply the desired active short circuit current to the network.

SYSTEM AND METHOD FOR UPWIND SPEED BASED CONTROL OF A WIND TURBINE

A method for controlling power output of a wind turbine generator in response to an anticipated change in wind speed is provided. The method includes sensing wind speed at a desired distance from the wind turbine generator in a direction of the wind. The method further includes controlling pitch of a blade of the wind turbine generator based upon sensed transient wind speed in advance of a change in wind speed at the wind turbine generator.

WIND ENERGY INSTALLATION

The invention relates to a wind energy installation, in particular to a wind energy installation comprising a device for dehumidifying a gaseous medium in an essentially enclosed chamber inside said wind energy installation. The aim of the invention is to minimise the human and logistical resources required to maintain the functional capacity of the device and to simplify the construction of the device, to achieve a virtually maintenance-free operation. To achieve this, the device comprises a first planar element (10) and a cooling device (12) for cooling the first element to a temperature below the ambient temperature.

Power control of a wind park

The invention relates to a method for controlling a wind power plant (1) or a wind park. A power control module (55) for the power output into a power grid is, according to the method, supplemented with an additional power device (6). This additional power device is operated in such a manner that, according to the voltage in the grid (9), a current reserve is established and is applied in the form of a correction value to the power control module (55). The invention makes use of the fact that components used for transmitting are, in their nominal output, designed for the worst instance of a low grid voltage. The power reserves arising from grid voltages above a tolerance value can, according to the invention, be used for transmission. This makes it possible to achieve a considerable increase in the transmission output without additional constructional effort. The invention also relates to wind power plant or wind park operated according to the method.

Method and apparatus for generating power in a wind turbine

A generator (118) for use in a wind turbine (10) is provided. The generator includes a rotor (106) including a plurality of rotor windings, the rotor configured to be electrically coupled to a wind turbine electrical distribution system, a stator (120) including a plurality of stator windings (302,402), the stator configured to be magnetically coupled to the rotor, and electrically coupled to the wind turbine electrical distribution system, and a terminal box (336) coupled to the stator, the terminal box configured to switch the stator between a first number of magnetic poles (312) and a second number of magnetic poles (314).

METHOD OF REGULATION OF the POWER Of an INSTALLATION OF ENERGY TRANSFORMATION AND INSTALLATION OF ENERGY TRANSFORMATION PILOTEE BY SUCH a METHOD

Cette méthode permet de réguler de la puissance d'une installation (100) de conversion d'énergie mécanique en énergie électrique. L'installation (100) comprend une machine (1), un alternateur (2), un premier convertisseur (41), un câble électrique (3) qui relie les bornes de l'alternateur (2) au premier convertisseur (41), un second convertisseur (42), des moyens de mesure (8, 41, 43), une unité de commande (5), le premier convertisseur (41) modulant la fréquence et le courant du premier signal électrique (S2). La méthode comprend une première étape préalable dans laquelle la valeur d'une première grandeur proportionnelle à une puissance réactive est implémentée dans l'unité de commande et une étape principale dans laquelle l'unité de commande (5) détermine la fréquence de pilotage et le courant de pilotage à partir d'une erreur égale à la différence entre la première grandeur et une seconde grandeur qui est homogène à la première grandeur, proportionnelle ou homogène à la puissance réactive ...

AN EARTING SYSTEM FOR A WIND TURBINE CONNECTED TO A UTILITY GRID AND FOR A WIND TURBINE PARK

The invention relates to an earthing system for a wind turbine connected to a utility grid. The wind turbine comprises at least one electric system such as low or high voltage power systems and cables (16), at least one control system such as a SCADA system and control cables (18), and/or at least one safety system such as a lightning protection system, wherein a connection to an electrically earth potential is established from one defined place (12) within the wind turbine for said systems. In another embodiment, a wind turbine comprises at least two electric systems such as a lightning protection system and a low or high voltage power system, an electrically earth potential established by at least one foundation earthing (8) including at least one earthing wire embedded partly or totally in the wind turbine foundation (6), and at least one electric conducting means (9) extending radial from said wind turbine (1) into the ground, wherein a connection to said electrically earth potential ...

POWER CONDITIONING ARCHITECTURE FOR A WIND TURBINE

A wind turbine 36 has a back-to-back AC/DC/AC power electronic converter chain in which the grid side converter 48 is connected in series with DFIG stator windings 64. The machine side converter 56 is fed from the rotor windings 54 of the DFIG 44. Series connection of the grid side converter 48 enables voltage sag ride-through capability via control of the stator flux. In the event of a grid voltage sag, the series converter allows for a controlled response in the stator flux and electromagnetic shaft torque, protects the machine side converter and enables continued power delivery to the grid.

SYSTEM AND METHOD FOR CREATING A NETWORKED INFRASTRUCTURE DISTRIBUTION PLATFORM OF FIXED HYBRID SOLAR WIND ENERGY GENERATING DEVICES AND SHEETS

A roadway system for energy generation and distribution is presented. In accordance with one embodiment of the invention, the roadway system comprises a plurality of ground-based hybrid solar- wind energy generating devices, one or more roads, and a roadway system electricity grid. The energy generating devices are connected to the roadway system electricity grid and substantially all of the ground-based hybrid solar-wind energy generating devices are positioned on part of one of the roads or near to one or more of the roads to thereby allow energy generation from wind created from passing vehicles in addition to energy generation from atmospheric wind. Also disclosed is an energy gathering sheet that harnesses and provides energy to various destinations. The energy gathering sheet is configured to receive small energy generating devices, which are mounted on a single sheet. The energy generating devices may be configured to harness both wind and solar energy. The single sheet of installable ...

PROTECTION SYSTEM OF A DOUBLY-FED INDUCTION MACHINE

The invention relates to a protection system of a doubly-fed induction machine, wherein the system comprises a crowbar connected to the rotor, one DC-chopper provided in the DC-link, a converter controller and a separate protection device, which controls the DC-chopper and the crowbar. In order to protect the DC-chopper against excessive heat, the protection device counts the firing pulses of the DC-chopper or measures the operating time of DC-chopper, wherein the minimum switch-off time of the DC-chopper depends on the number of firing pulses or the amount of operating time in a previous operating cycle of the DC-chopper. The converter controller estimates a rotor current by using a machine model of the doubly-fed induction machine and measured values of the stator voltage, the stator current and the angle between stator and rotor voltage. The doubly-fed induction machine is switched off from the grid by the converter controller if a critical crowbar current is determined.

WIND POWER PLANT HAVING FIXED-SPEED AND VARIABLE-SPEED WINDMILLS

A wind power plant has at least one fixed-speed windmill (FS1-FS4) and at least one variable-speed windmill (VS1-VS4) which are coupled to a common electric network (CNET1-CNET3, EPG). The variable-speed windmill has a controllable converter means (10) for independent control of active power (P) and of reactive power (Q) supplied to the common electric network, in dependence on an active power set point value (Pset) and a reactive power set point value (Qset). The power plant further has measuring means (121-125) for providing, in a frequency interval that extends above and below a frequency of 8.8 Hz, measured values (U, I) representative of one of a voltage fluctuation and of a fluctuation in active and reactive power at a selected point in the common electric network. The plant further comprises flicker control means (16, 17, 18P, 18Q), responsive to fluctuations in said frequency interval, for receiving the measured values and generating at least one of an active power flicker correction ...

METHOD OF REGULATING THE POWER OF AN ENERGY CONVERSION INSTALLATION AND ENERGY CONVERSION INSTALLATION DRIVEN BY SUCH A METHOD

This method makes it possible to regulate the power of an energy conversion installation (100) for converting mechanical energy into electrical energy. The installation (100) comprises a machine (1), an alternator (2), a first converter (41), an electrical cable (3) which links the terminals of the alternator (2) to the first converter (41), a second converter (42), means of measurement (8, 41, 43), a control unit (5), the first converter (41) modulating the frequency and the current of the first electrical signal (S2). The method comprises a first prior step in which the value of a first quantity proportional to a reactive power is implemented in the control unit and a main step in which the control unit (5) determines the drive frequency and the drive current on the basis of an error equal to the difference between the first quantity and a second quantity which is both homogeneous to the first quantity, dependent on the reactive power of the first converter (41) and determined on the ...

SYSTEM FOR PRODUCING ELECTRICAL ENERGY

The invention describes a system () for producing electrical energy, configured to be operatively connected to a machine for generating air flows (), consisting in particular but not exclusively of the motor of an air conditioner. The system () comprises at least one wind turbine () and at least one air collector (), arranged between the machine for generating air flows () and such a wind turbine (). The air collector () is configured to channel and constantly reinforce the air flow emitted by the machine for generating air flows () in order to improve the yield of the wind turbine (). 110121014161214161214. System () for producing electrical energy , configured to be operatively connected to a machine for generating air flows () , consisting in particular but not exclusively of the motor of an air conditioner , the system () being characterised in that it comprises at least one wind turbine () and at least one air collector () , arranged between the machine for generating air flows () and said wind turbine () , wherein the air collector () is configured to channel and constantly reinforce the air flow emitted by the machine for generating air flows () in order to improve the yield of the wind turbine ().21016182012221420222426. System () according to claim 1 , characterised in that the air collector () is provided with an outer casing () divided into an air inlet duct () claim 1 , facing towards the machine for generating air flows () claim 1 , and an air outlet duct () claim 1 , facing towards the wind turbine () claim 1 , in which the air inlet and outlet ducts ( claim 1 , ) are separated by a separating wall () provided with a plurality of through holes () for the air.3102028281214. System () according to claim 2 , characterised in that inside the air inlet duct () there is at least one idle fan () claim 2 , in other words not provided with its own actuation means claim 2 , said fan () being set in rotation by the air flow emitted by the machine for generating ...

METHOD FOR OPERATING A WIND TURBINE DURING A DISTURBANCE IN THE GRID

METHOD FOR CONTROLLING A POWER-GRID CONNECTED WIND TURBINE GENERATOR DURING GRID FAULTS AND APPARATUS FOR IMPLEMENTING SAID METHOD

The present invention relates to a method and an apparatus for controlling a power-grid connected wind turbine generator during grid faults. During grid faults, the stator windings of the wind turbine generator are disconnected from the power grid and impedances for dissipating at least part of the power generated by the wind turbine during grid fault condition are connected to the stator windings. In this way, a certain magnetisation of the generator can be maintained and after removal of the grid fault condition, the generator is synchronised to the power grid and the impedances are disconnected and the stator windings are reconnected to the power grid. In this way, it is possible to keep the wind turbine generator at least partly magnetised during grid faults and thus ready for delivering power to the power grid, as soon as the grid voltage is re-established after the fault.

Wind energy installation and method of controlling the output power from a wind energy installation

A wind energy installation and a method of controlling the output power (P) from a wind energy installation to an electrical grid (7) with a specified nominal grid frequency (fN) are provided, in which the output power (P) is controlled as a function of the time derivative of the grid frequency (f).

ELECTRICAL ENERGY GENERATING INSTALLATION DRIVEN AT VARIABLE ROTATIONAL SPEEDS, WITH A CONSTANT OUTPUT FREQUENCY, ESPECIALLY A WIND POWER INSTALLATION

WIND POWER PLANT COMPRISING A REACTIVE POWER MODULE FOR SUPPORTING A POWER SUPPLY SYSTEM AND CORRESPONDING METHOD

WIND POWER PLANT HAVING FIXED-SPEED AND VARIABLE-SPEED WINDMILLS

A wind power plant has at least one fixed-speed windmill (FS1-FS4) and at least one variable-speed windmill (VS1-VS4) which are coupled to a common electric network (CNET1-CNET3, EPG). The variable-speed windmill has a controllable converter means (10) for independent control of active power (P) and of reactive power (Q) supplied to the common electric network, in dependence on an active power set point value (Pset) and a reactive power set point value (Qset). The power plant further has measuring means (121-125) for providing, in a frequency interval that extends above and below a frequency of 8.8 Hz, measured values (U, I) representative of one of a voltage fluctuation and of a fluctuation in active and reactive power at a selected point in the common electric network. The plant further comprises flicker control means (16, 17, 18P, 18Q), responsive to fluctuations in said frequency interval, for receiving the measured values and generating at least one of an active power flicker correction ...

WIND FARM AND METHOD FOR OPERATING SAME

A wind farm with at least two wind turbines (1, 2, 3, 4) connected to a power grid is provided, said wind farm further comprising a control unit (5) connected to said at least two wind turbines (1, 2, 3, 4), and a sensor unit (6) connected to said power grid and said control unit (5), wherein said sensor unit (6) is adapted to measure the grid frequency of said power grid and to transmit said measured grid frequency to said control unit (5), and wherein said control unit (5) is adapted to control the output of real power of said wind farm according to said measured grid frequency. Furthermore, a method for operating a wind farm is proposed, said method comprising the steps of measuring the grid frequency with a sensor unit, transmitting said measured grid frequency to a centralized control unit, determining whether the measured grid frequency lies outside a predetermined range, and, if the measured grid frequency lies outside said predetermined range, selecting at least one out of the at ...

METHOD AND SYSTEM FOR REGULATION OF THE ROTATIONAL SPEED OF A ROTOR ON A WIND TURBINE

... ²²²The invention relates to a method and a system for regulation of the ²rotational speed (52) of a rotor on a wind energy unit with a generator and a ²rotor blade. The first set parameter is a pitch angle (Pitch) of the rotor ²blade and the second set parameter is the torque of the generator. Said system ²comprises a pitch angle control or regulation device (32), a torque control or ²regulation device (33), a first device for determination of a first rotational ²speed set value (28) (first rotational speed set value determination device ²(29)) and a second device (26) for determination of a second rotational speed ²set value (29) (second rotational speed set value determination device (26)). ²The first rotational speed set value (28) may be supplied to the pitch angle ²control or regulation device (32) and the second rotational speed set value ²(29) may be supplied to the torque control or regulation device (33), wherein ²the first and second rotational speed set value (28, 2)) may be ...

METHOD FOR OPERATING A WIND ENERGY PLANT

The invention relates to a method for operating a wind energy plant with a generator driven by a rotor for the production of electrical power for an electrical user, in particular an electrical network. In order to counteract variations in the network as far as possible, the method as above is developed such that the power supplied to the user from the generator is regulated depending upon a current supplied to the user.

ROOF MOUNTED WIND TURBINE

A system for generating electrical power for an individual property (10) comprises a wind powered electricity generator (16) mounted on that property and arranged so that the electrical power generated be used in that property in preference to or to supplement electrical power provided by the national grid or other general electrical energy source.

Method and apparatus for generating power in a wind turbine

The invention relates to a method and an apparatus for generating power in a wind turbine. A power converter for a wind turbine including an array of switching devices and a control module having a current damping device. The control module is configured to control a switching behavior of the array of switching devices and to receive a current having a first frequency component from the wind turbine. The current damping device is configured to reduce an amplitude of the first frequency component.

Control system for a wind park

The invention describes a control system (1) for a wind park (2). The control system comprises a plurality of limit controllers (12A, 12B, 12C, ..., 12n), wherein each limit controller (12A, 12B, 12C, ..., 12n) is realised to output a limit value set (120A, 120B, 120C, ..., 120n) on the basis of a specific grid code requirement (13A, 13B, 13C, ..., 13n); a selection unit (11) for compiling a limit value set (Umin new, Umax_new) from the plurality of limit value sets (120A, 120B, 120C, ..., 120n) according to a number of grid code requirements; and a number of main controllers (10, 10', 10"), wherein a main controller (10, 10', 10") is realised to generate a setpoint (100) for one or more wind turbines (20) of the wind park (2) according to the compiled limit value set (Umin_new, Umax_new). The invention also describes a wind park (2), and a method of controlling a wind park (2).

METHOD FOR OPERATING A WIND POWER STATION AND WIND POWER STATION

The invention relates to a method for operating a wind power station comprising a generator for delivering electrical power to an electrical network (1) to which the wind power station is connected. The invention also relates to a wind power station comprising a rotor and an electrical generator that is coupled to said rotor, for delivering electrical power to an electrical consumer, especially an electrical network. The method is characterised in that the power delivered to the network by the generator is regulated or adjusted according to the network frequency of said electrical network. © KIPO & WIPO 2007 ...

ADJUSTABLE-SPEED GEAR FOR AN ENERGY GENERATION INSTALLATION

Adjustable-speed gear for an energy generation installation. Said gear comprises: an input shaft, which is connected at least indirectly to a power consumer of a wind or hydroelectric power generator; an output shaft, which is connected at least indirectly to an electric generator, the speed of the output shaft being substantially constant; a differential drive, which is connected at least indirectly to the input shaft and which divides the power between a first power branch that is at least indirectly connected to the output shaft and a second power branch. The second power branch comprises at least two hydrodynamic circuits, at least one of which is connected at least indirectly to the first power branch. © KIPO & WIPO 2007 ...

VERTICAL AXIS WIND TURBINE

A turbine assembly is provided. The turbine assembly includes a plurality of sails and a generator assembly configured to convert rotation thereabout to power. A brake assembly may be provided. The brake assembly may include a magnet assembly that rotates with rotation of the plurality of sails, a conducting plate initially spaced-apart from the magnet assembly, and an actuator for translating the conducting plate relative to the magnet assembly during rotation thereof to thereby induce eddy currents that create a magnetic field acting on the conducting plate to impart a retarding force to control the rotational speed thereof. A control module is configured to control the actuator to adjust the spacing between the magnet assembly and the conducting plate in order to maintain the turbine assembly at a predetermined speed.

GENERATOR-FAULT-TOLERANT CONTROL FOR A VARIABLE-SPEED VARIABLE-PITCH WIND TURBINE

Present invention relates to a fault-tolerant control scheme for variable-speed variable-pitch wind turbines with an inverter-fed generator. Invention is focused on generator faults that can be well characterized with machine flux path areas where the generator torque should be limited to prevent fault propagation and with the maximum safety torque value in that path areas. An extension of the classical two-loop control structure of variable-speed variable-pitch wind turbines is proposed which ensures that the fault is fully respected in operation and that power delivery under fault is deteriorated as less as possible compared to healthy machine conditions. The first step is the acquisition of the momentary angular velocity of the generator cog and the associated required generator torque T'gref (401). Upon detection of a fault, the fault detection algorithm establishes the location of the fault and the fault severity providing the location in terms of angles θ1, θ2 related to the rotating ...

POWER GENERATING APPARATUS OF RENEWABLE ENERGY TYPE AND OPERATION METHOD THEREOF

It is intended to provide a power generating apparatus of renewable energy type and an operation method of the power generating apparatus, which can achieve both variable speed operation and grid connection without a frequency converting circuit and which uses a hydraulic transmission. In the power generating apparatus of renewable energy type 1, renewable energy received via a blade 4 is transmitted to a synchronous generator 20 via a rotating shaft 8 and a hydraulic transmission 10. The synchronous generator 20 is driven by a hydraulic motor 14 of the hydraulic transmission 10 to generate power. The synchronous generator 20 is connected to a grid without a frequency converting circuit and the power generated by the synchronous generator 20 is supplied to the grid 50. The power generating apparatus 1 is also provided with a transmission controller 40 which controls the hydraulic transmission 10. The transmission controller 40 controls the hydraulic transmission 10 in a normal operation ...

WIND TURBINES HAVING CONTROL FOR NETWORK FAULTS AND OPERATING METHOD THEREFOR

The invention relates to a wind turbine, comprising a generator (2) driven by a wind rotor (12) and an inverter (3) for generating electric energy, which is fed into a network (9), and a controller (4). The controller has a special network interruption module (5), which comprises as components a measuring device (51) of an electric parameter for the frequency of the network (9), a detector (52) for detecting the formation of an isolated network and outputting a switch signal, a reference generator (53), which based on a parameter determined by the measuring device (51) generates a replacement guidance vector for the inverter (4), a fault guidance unit (54) having a fault classifier (55) and interacting with the other components (51-53) such that in the event of undervoltage during isolated operation a fast frequency regulator (64) is activated, which acts on the inverter (4) in order to change the effective power supply P in the event of a variance of the network frequency. The invention ...

Method for operating a wind park

Wind power installations were initially always erected in the form of individual units and it is only in recent years that, caused also by administrative and building regulations, wind power installations are frequently installed in wind parks. In that respect a wind park in its smallest unit is an arrangement of at least two wind power installations, but frequently markedly more. By way of example mention may be made of the wind park at Holtriem (East Frisia) where more than 50 wind power installations are set up in an array. It is to be expected that the number of units and also the installed power of the wind power installations will also increase greatly in the forthcoming years. In most cases the wind potential is at its greatest in regions of the power supply networks with a low level of short-circuit power and low population density. It is precisely there that the technical connection limits are quickly reached by the wind power installations, with the result that it is then no longer ...

Geophysical energy source utilization circuit

A conversion means converts the energy available from a source, such as the wind or sun, into a corresponding amount of d.c. electrical power. A switching circuit, typically a thyristor bridge, is connected between the conversion means and an a.c. load and across a.c. power mains energizing the load. The switching circuit is operable to periodically connect the conversion means to the a.c. load in a power supplying manner. The a.c. mains impart suitable voltage and frequency characteristics to the electrical power so supplied. In the event the supplied power exceeds the power required by the a.c. load, the difference is taken by the a.c. power mains.

WIND TURBINE SYSTEMS AND METHODS FOR OPERATING THE SAME

Wind turbine systems and methods for operating wind turbine systems are provided. A method includes monitoring an operating condition of the wind turbine system, and determining whether the operating condition has exceeded a predetermined threshold. The method further includes switching a plurality of switches devices in a rotor side converter of a power converter of the wind turbine system in a normal switching mode if the operating condition is less than the predetermined threshold. The method further includes switching the plurality of switching devices in a short circuit switching mode if the operating condition is greater than or equal to the predetermined threshold. The method further includes switching the plurality of switching devices in the normal switching mode after switching in the short circuit mode if the operating condition decreases below the predetermined threshold and a secondary operating condition is below a secondary predetermined threshold.

SYSTEM AND METHOD FOR CONTROLLING A POWER OUTPUT OF A WIND TURBINE GENERATOR

A method for controlling the power output of a wind turbine, which includes a transformer with multiple taps, is provided. The method includes sensing a voltage of the transformer during operation of the wind turbine, determining the reactive power, and automatically maintaining a set value of the reactive power by controlling the output voltage of the transformer.

Wind energy installation

Wind energy installation

Die vorliegende Erfindung betrifft eine Windenergieanlage, insbesondere eine Windenergieanlage mit einer Vorrichtung zum Entfeuchten eines gasförmigen Mediums in einem im Wesentlichen geschlossenen Raum innerhalb der Windenergieanlage. Um den personellen und logistischen Aufwand zum Erhalten der Funktionsfähigkeit der Vorrichtung gering zu halten den Aufbau zu vereinfachen und einen weitestgehend wartungsfreien Betrieb zu ermöglichen, umfasst die Vorrichtung ein erstes, flächiges Element und eine Kühlvorrichtung zum Kühlen des ersten Elements auf eine Temperatur unterhalb der Umgebungstemperatur.

Apparatus and method for operating a wind turbine under low utility grid voltage conditions

The present invention relates to a wind turbine and an associated method for controlling the output current from said wind turbine to an electric power grid, and, more particularly, to a wind turbine and a method for controlling the current under conditions of grid voltage variations due to changing grid conditions as in the case for example when a wind turbine experiences and recovers from a fault.

A system for providing electrical power to a wind turbine component.

A system for providing electrical power to one or more wind turbine electrical components is provided comprising an electrical grid and an auxiliary power source for providing electrical power, and one or more wind turbines. Each of the wind turbines includes a wind turbine generator, one or more electrical components, a main voltage transformer for connecting the wind turbine generator to the grid and a switchgear arranged between the main voltage transformer and a point of connection to the grid. One or more switches for alternately connecting either said electrical grid or said auxiliary power source to the switchgears of the wind turbines are provided. The switchgears comprise a switchgear voltage transformer, the switchgear voltage transformer includes primary and secondary windings, the primary windings receiving power from the electrical grid or auxiliary power source, and the secondary windings delivering electrical power to the wind turbine electrical components.

A method for eliminating the impact of backlashes in the gearbox of a wind turbine

Method for operating a wind turbine comprising a drive train driving one or more electrical generators (23, 31) that supply power to an electric grid (11), by which, in events that can create a load inversion in the gearbox (17), a drive train dump load (5) is activated for ensuring that the drive train torque has a constant direction, avoiding the impact of backlashes in the gearbox (17), said dump load (5) consisting of power absorbed by one or several means chosen among means specifically dedicated to the absorption of said dump load (5) and means present at the wind turbine for other purposes. The invention also refers to a wind turbine for implementing said method.

Method for operating a wind turbine

Installation for heating dwelling, has generation unit for generating electrical energy from renewable energy source, and heat pump connected to communication unit to consume electric power provided by supply network

Cette installation (1), qui est couplée à un réseau électrique externe (15), comporte : - un réseau électrique domestique (3) raccordé au réseau externe ; - un moyen de génération d'énergie électrique à partir d'une énergie renouvelable (7, 9, 11, 13) connecté au réseau domestique et propre à fournir une première puissance électrique au réseau externe ; et, - une pompe à chaleur (25) connectée au réseau domestique et propre à consommer une seconde puissance électrique fournie par le réseau externe. L'installation est dimensionnée de sorte que le produit de la première puissance par un prix de vente soit supérieur ou égal au produit de la seconde puissance par un prix d'achat.

DISPOSITIF REGULE DE PRODUCTION D'ENERGIE ELECTRIQUE, TEL QUE DISPOSITIF EOLIEN

L'invention concerne un dispositif régulé de production d'énergie électrique. Une éolienne comporte, montée sur un arbre 21, une hélice 1 à pales fixes qui entraîne une génératrice 5 par l'intermédiaire d'un multiplicateur de transmission 2 et un arbre 22. La génératrice 5 comporte deux groupes de balais respectivement principaux et secondaires. Le moyeu de l'hélice 1 est utilisé comme rotor induit d'un frein à courant de Foucault 3 dont le stator inductcur est alimenté par un courant débité, à partir d'une certaine vitesse par les balais secondaires de la génératrice. L'invention s'applique aux éoliennes.

WIND TURBINE GENERATOR

WINDMILL CONTROL DEVICE AND METHOD AND WIND POWER GENERATION SYSTEM

COOLING ASSEMBLY FOR WIND TURBINE

Cooling assembly for cooling a generator in a directly driven wind turbine and method of assembling a cooling system. The cooling assembly comprises a stator base part (1), a plurality of stator coil elements (3) of the generator being attached in operation to a surface of the stator base part (1). The cooling assembly further comprises a conduit assembly (2) having a plurality of conduits (6) for transporting a cooling fluid. The stator base part (1) has a cylinder shaped surface provided with a plurality of tangential grooves (5), wherein the plurality of conduits (6) are formed in the plurality of tangential grooves (5).The stator base part (1) comprises m groups of n grooves (5), m and n being integer numbers, and m>1.

RENEWABLE ENERGY RESOURCES

Wind power is used to generate electricity as A.C. that can be used to supplement or replace national grid power for an individual property. A plug-in unit takes electrical power from one or more wind generators and delivers the required A.C. to the mains. More than one wind turbine may be arranged on the roof of a building. Multiple rows of turbines may have different heights. A spring-loaded tail fin may be included for appropriate orientation of the wind turbine(s).

WIND FARM

The invention relates to a wind farm comprising a rotor (100) comprising at least one rotor blade which is coupled directly or indirectly to a generator for the production of electric power. Said wind farm also comprises an electric system made of various electrical system units comprising electronic, electric and/ or electromechanical, and/or sensor components and/or electrotechnical protection devices. All components of an electric system unit, system units or specific components of the electric system unit are combined together according to the uses thereof in one or several functional modules which perform at least one function in connection with the production of electric power. At least one parallel module is provided for at least one function module. Said parallel module performs or can perform the same or similar function as the function module during normal operation of the system. The function module and parallel module are connected together or can be connected together in such ...

ELECTRICITY GENERATION SYSTEM THAT WITHSTANDS VOLTAGE DIPS

The invention comprises a doubly-fed generator (), the rotor thereof is connected to the power grid () by a back-to-back converter () and the stator thereof is connected to the power grid (), essentially standing out for additionally comprising at least one first additional impedance () connected in parallel between the generator () rotor and the back-to-back converter (); at least one second additional impedance () connected to the generator stator (); and at least one control unit capable of governing the additional impedances (). 13-. (canceled)412343. Electrical power generation system () resistant to voltage dips which comprises a doubly-fed generator () , the rotor thereof is connected to the power grid () by a back-to-back converter () and the stator thereof is connected to the power grid () , characterized in that it comprises:{'b': 5', '2', '4, 'at least one first additional impedance () connected in parallel between the generator () rotor and the back-to-back converter ();'}{'b': 6', '2, 'at least one second additional impedance () connected to the generator stator (), adapted to be activated only once the grid voltage falls below a dip profile and'}{'b': 5', '6, 'at least one control unit capable of governing the additional impedances (, ).'}5127. System () claim 4 , according to claim 4 , where the generator () rotor is connected to a wind turbine ().61. Method for operating a system () claim 4 , according to claim 4 , characterized in that it comprises:detecting the voltage dip,{'b': 3', '5, 'remaining connected to the grid () and making use, for the required period of time, of the first additional impedance (),'}injecting the required reactive current,detecting that a maximum operating period elapses under these conditions,{'b': 3', '6', '2, 'disconnecting the stator of the grid () stator and activating the second additional impedance () once the grid voltage falls below a dip profile, thereby controlling the generator () load torque,'}{'b': '3', ' ...

Method of operating a wind turbine, wind turbine, wind turbine controlling system, and processing system

According to an embodiment, a method of operating a wind turbine comprising a DC-to-AC voltage converter is provided, the wind turbine being connectable to a grid via the DC-to-AC voltage converter, the method comprising: determining a line voltage of a power line connecting the DC-to-AC voltage converter to the grid; if the determined line voltage exceeds a predefined voltage threshold value, injecting reactive current into the power line, wherein the amount of reactive current injected is chosen such that an output voltage of the DC-to-AC voltage converter is kept within a predetermined voltage range.

Invention 30.8.10

The invention is a wind energy conversion device that can use microwaves or electrical discharges to pass the electricity to another position 1) The invention is an apparatus to direct microwaves carrying electrical currents that have being generated by a wind energy conversion apparatus from such an apparatus to a desired position on the ground or to another device in the sky and which can be mounted internally or externally on the untethered wind energy conversion device where an apparatus rotates on itself to absorb substantially all of the wind , assisted by fins or similar features that are designed to make contact with the wind , thereby helping to maintain a desired position in the sky , and where the rotation drives an electrical generator within the device.2) A device according to which can convert electricity to microwaves and where the apparatus to do this is carried internally within the device.3) A device according to where the apparatus to transfer microwaves to a desired point in the ground or sky is carried externally and fixed to the outside of the wind energy conversion apparatus.4) A device with an apparatus according to which is attached to the outside of the device in .5) A device according to with a series of other similar devices that can transfer electricity to a series of points in the sky until it is desired to relay the electricity to the ground or another point.6) A device according to which may have a number of features that face into the direction of the oncoming wind but which are not designed to catch wind as a fin by may add to the stability of the wind energy conversion apparatus as it rotates.7) A device according to where the fins or other features on the surface of the wind energy conversion device may have indentations or have variations in the shape of the fin as shown in of the drawing which may assist the stability of the wind energy conversion device as it rotates.8) A device according to which may have fins constructed of ...

Wind-turbine-generator control system, wind turbine generator, and wind-turbine-generator control method

A power-converter controller is provided in a wind turbine generator which is interconnected to a utility grid and in which a generator generates electrical power by rotation of a rotor having blades. The power-converter controller includes a voltage sensor that measures a generator terminal voltage, resonance-component extracting sections that extract an electrical resonance component generated due to the interconnection from a measurement result measured by the voltage sensor, and a control section and a control section that control a current that flows to the utility grid so as to suppress the resonance component, on the basis of the resonance component extracted by the resonance-component extracting sections. Accordingly, the power-converter controller can more effectively suppress the resonance generated due to the interconnection of the wind turbine generator to the utility grid.

POWER GENERATING APPARATUS OF RENEWABLE ENERGY TYPE AND OPERATION METHOD THEREOF

It is intended to provide a power generating apparatus of renewable energy type and an operation method of the power generating apparatus, which can achieve both variable speed operation and grid connection without a frequency converting circuit and which uses a hydraulic transmission. In the power generating apparatus of renewable energy type , renewable energy received via a blade is transmitted to a synchronous generator via a rotating shaft and a hydraulic transmission . The synchronous generator is driven by a hydraulic motor of the hydraulic transmission to generate power. The synchronous generator is connected to a grid without a frequency converting circuit and the power generated by the synchronous generator is supplied to the grid . The power generating apparatus is also provided with a transmission controller which controls the hydraulic transmission . The transmission controller controls the hydraulic transmission in a normal operation mode to adjust displacement of each of a hydraulic pump and the hydraulic motor such that the rotating shaft rotates at a rotational speed that is variable with respect to flow speed of the renewable energy while keeping a rotational speed of the synchronous generator at a synchronous speed based on frequency of the grid during normal operation of the power generating apparatus. 1. A power generating apparatus of renewable energy type which generates power using renewable energy , comprising:a blade;a rotating shaft which is rotated by the renewable energy received via the blade;a hydraulic transmission which comprises a hydraulic pump driven by the rotating shaft and a hydraulic motor driven by pressurized oil supplied from the hydraulic pump;a synchronous generator which is driven by the hydraulic motor to generate power and coupled to a grid without an intervening frequency-conversion circuit, the generated power being supplied to the grid;a transmission controller which controls the hydraulic transmission in a normal ...

Split permanent magnet machine

The invention relates to an electrical energy conversion system ( 11 ) which is particularly suited for use in wind energy conversion systems. The system includes two magnetically separated permanent magnet machines ( 25, 27 ) linked by a freely rotating rotor ( 19 ) housing permanent magnets ( 39 ). The first machine is typically a synchronous generator, and the second an induction generator. The synchronous generator ( 25 ) has a stationary stator ( 21 ) which is connectable to an electrical system such as an electricity grid, and the induction generator ( 27 ) has a rotor ( 17 ) which is connectable to a mechanical drive system such as, for example, a wind turbine.

VERTICAL AXIS WIND TURBINE

A turbine assembly is provided. The turbine assembly includes a plurality of sails and a generator assembly configured to convert rotation thereabout to power. A brake assembly may be provided. The brake assembly may include a magnet assembly that rotates with rotation of the plurality of sails, a conducting plate initially spaced-apart from the magnet assembly, and an actuator for translating the conducting plate relative to the magnet assembly during rotation thereof to thereby induce eddy currents that create a magnetic field acting on the conducting plate to impart a retarding force to control the rotational speed thereof. A control module is configured to control the actuator to adjust the spacing between the magnet assembly and the conducting plate in order to maintain the turbine assembly at a predetermined speed. 1. A turbine assembly comprising:a plurality of sails;a generator assembly configured to convert rotation thereabout to power; and a magnet assembly that rotates with rotation of the plurality of sails;', 'a conducting plate initially spaced-apart from the magnet assembly; and', 'an actuator for translating the conducting plate relative to the magnet assembly during rotation thereof to thereby induce eddy currents that create a magnetic field acting on the conducting plate to impart a retarding force to control the rotational speed thereof; and, 'a brake assembly includinga control module configured to control the actuator to adjust the spacing between the magnet assembly and the conducting plate in order to maintain the turbine assembly at a predetermined speed.2. The turbine assembly of claim 1 , wherein the generator assembly includes:a coil mold having a plurality of coil packs therein; anda magnet assembly spaced-apart from the coil mold and configured to rotate with rotation of the plurality of sails.3. The assembly of claim 2 , wherein the generator assembly is coupled to the grid.4. The assembly of claim 2 , further comprising an inverter ...

WIND TURBINE WITH A PRIMARY AND A SECONDARY GENERATOR AND METHOD OF OPERATING SUCH WIND TURBINE

This invention relates to a wind turbine of variable speed type including: a wind turbine tower; a nacelle on said wind turbine; a wind turbine rotor hub rotatably mounted at said nacelle, said wind turbine rotor hub having at least one wind turbine blade mounted thereon and a shaft coupled to said wind turbine rotor hub and to, optionally via a gear box, a primary generator which via power lines has a primary stator electrically connected to a grid connection and a primary rotor electrically connected to a back-to-back converter at a generator side converter end wherein the back-to-back converter at a grid side converter end is electrically connected to the grid connection. The wind turbine further includes a secondary generator coupled to the shaft via a mechanical coupling and electrically connected to the primary rotor of the primary generator and the generator side converter end of the back-to-back converter. 1. A wind turbine of variable speed type comprising:a wind turbine tower;a nacelle provided on said wind turbine;a wind turbine rotor hub rotatably mounted at said nacelle, said wind turbine rotor hub having at least one wind turbine blade mounted thereon;a shaft coupled to said wind turbine rotor hub and to, optionally through a gear box,a primary generator which via power lines has a primary stator electrically connected to a grid connection, and a primary rotor electrically connected toa back-to-back converter at a generator side converter end and wherein the back-to-back converter at a grid side converter end is electrically connected to the grid connection;wherein a secondary generator coupled to the shaft via a mechanical coupling and electrically connected to the primary rotor of the primary generator and to the generator side converter end of the back-to-back converter.2. A wind turbine according to claim 1 , wherein the primary generator is a DFIG-generator.3. A wind turbine according to claim 1 , wherein said secondary generator is a permanent ...

Wind turbine control for a weak grid by reducing active power output

A method is provided for controlling a wind turbine connected to a node connected to a utility grid. The node also has a plurality of other wind turbines connected to it. The method includes measuring a quantity indicative of a slope of a voltage at the node in dependence of active power delivered to the node, determining that the slope is smaller than a negative slope limit, and performing a measure, in order to increase the slope above the slope limit.

INRUSH CURRENT PROTECTION FOR WIND TURBINES AND WIND FARMS

A wind turbine is provided. The wind turbine includes a transformer having a low-voltage side and a high-voltage side. The transformer is configured to step up a voltage of the low-voltage side of the transformer to a voltage of an external grid. The wind turbine further includes an electrical power generating unit which is connected to the low-voltage side of the transformer and configured to feed an ac-power to the low-voltage side of the transformer. A charging device of the wind turbine is connected to the low-voltage side of the transformer and configured to charge the low-voltage side of the transformer when the generator does not feed ac-power to the low-voltage side of the transformer. 1. A wind turbine comprising:a transformer comprising a low-voltage side and a high-voltage side and configured to step up a low voltage at the low-voltage side to high voltage of an external grid;an electrical power generating unit connected to the low-voltage side of the transformer and configured to feed an ac-power to the low-voltage side of the transformer; anda charging device connected to the low-voltage side of the transformer and configured to charge the low-voltage side of the transformer when the electrical power generating unit does not feed ac-power to the low-voltage side of the transformer.2. The wind turbine of claim 1 , further comprising a switch connected between the external grid and the high-voltage side of the transformer and configured to open and close a connection between the high-voltage side of the transformer and the external grid.3. The wind turbine of claim 2 , wherein the charging device comprises a controller connected to the switch and configured to issue closing the switch.4. The wind turbine of claim 2 , further comprising a voltage switchgear comprising the switch and a voltage transformer comprising a high-voltage side connected to the external grid and a low voltage side claim 2 , wherein the charging device is connected to the low voltage ...

Utilizing flux controllable pm electric machines for wind turbine applications

A wind turbine is disclosed. The wind turbine comprises a tower with a nacelle mounted to the tower. A hub, with a plurality of blades extending therefrom, is rotatably mounted to the nacelle. A main shaft rotates with the hub, and at least one generator system is operatively connected to the main shaft. The generator system of the wind turbine comprises a permanent magnet generator. The permanent magnet generator comprises a rotor and a stator for generating a high frequency alternating current (HFAC) power output from the rotation of the main shaft, and a magnetic flux diverter circuit for modulating the output of the permanent magnet generator. The generator system may further comprise a power transformation circuit for transforming the HFAC power output into a low frequency alternating current power output.

Method and module for measuring the rate of change of frequency of waveforms related to converter units in wind turbine generators

Method and module for measuring the rate of change of frequency of a waveform related to a converter unit of a wind turbine generator, comprising: measuring an instantaneous value of said rate of change of frequency of the waveform, calculating a first filtered value of said rate of change of frequency, said first filtered value having good accuracy but low time response, and calculating a second filtered value of said rate of change of frequency said second filtered value having a good time response but low accuracy, comparing said first and second filtered values and selecting that an output value of said measured rate of change is based on said first or second filtered values depending on said comparison. 1. Method for measuring the rate of change of frequency (ROCOF-CNT) of a waveform related to a converter unit of a wind turbine generator , said method comprising the steps of:measuring an instantaneous frequency value of said waveform related to said converter unit,calculating a first filtered value (ROCOF-F1) of said rate of change of frequency (ROCOF) based on said instantaneous frequency value, said first filtered value (ROCOF-F1) having a measurement error lower than a first predetermined measurement error (DB-ROCOF-F1), said first filtered value (ROCOF-F1) having a time response slower than a predetermined time response requirement (t1), characterized bycalculating a second filtered value (ROCOF-F2) of said rate of change of frequency (ROCOF) based on said instantaneous frequency value, said second filtered value (ROCOF-F1) having a second measurement error (DB-ROCOF-F2) higher than said first predetermined measurement error (DB-ROCOF-F1), said second filtered value (ROCOF-F2) having a time response faster than said predetermined time response requirement (t1), andcalculating a comparison value (Comp) between said first filtered value (ROCOF-F1) and said second filtered value (ROCOF-F2), anddetermining that an output (ROCOF-CNT) value of said measured rate ...

Method of operating a wind turbine as well as a system suitable therefor

According to a method of the present invention, a method of operating a wind turbine comprising a power generator, a generator side converter connected to the power generator, a line side converter connected to a power grid through power components, and a DC-link connected between the generator side converter and the line side converter is provided, the method comprising: monitoring the grid voltages on the power grid for overvoltage events; if an overvoltage event is detected, operating the line side converter in an overmodulation range for at least a part of the duration of the overvoltage event.

METHOD AND SYSTEM FOR OPERATING A WIND TURBINE

A wind turbine includes a grid side converter coupled to a grid via a power line. The method includes determining a first active power reference and a first reactive power reference indicating a requested amount of active power and reactive power, respectively, depending on at least a wind turbine operation strategy; determining a positive and negative sequence components of a grid voltage; determining indications of an actual amount of active power and reactive power to be supplied by the grid side converter to the grid, respectively; generating a parameters defining a proportion of positive sequence current component and negative sequence current component to be injected by the grid side converter in order to supply active power and reactive power; and supplying, with the grid side converter, active and reactive power to the power line based on the current reference. 1. A method for operating a wind turbine comprising a grid side converter , the grid side converter being coupled to a grid via a power line , the method comprising:determining a wind turbine operation strategy;determining a first active power reference and a first reactive power reference indicating a requested amount of active power and reactive power, respectively, depending on at least the wind turbine operation strategy;measuring a grid voltage of the grid;determining a positive sequence voltage and a negative sequence voltage from the grid voltage;determining a second active power reference and a second reactive power reference indicating an actual amount of active power and reactive power to be supplied by the grid side converter to the grid, respectively, depending on at least the first active power reference, the first reactive power reference, and the wind turbine operation strategy;generating, based on at least the wind turbine operation strategy, a first parameter and a second parameter which define a proportion of positive sequence current component and negative sequence current component ...

WIND TURBINE AND METHOD OF OPERATING A WIND TURBINE

A method of operating a wind turbine comprising a rotor, a multi winding generator having a plurality of independent sets of control windings and a plurality of independent power electronic converters for controlling each set of control windings independently, the method comprising in a normal operation mode, the plurality of power electronic converters controlling the sets of control windings in substantially the same way, whereas in a positioning mode for positioning a rotor of a wind turbine in one of one or more predetermined angular positions, one of the independent power electronic converters controlling its corresponding set of control windings in a substantially different manner than at least one other independent power electric converter. The invention further relates to a wind turbine adapted to work in at least two different operating modes. 1. A method of operating a wind turbine including a rotor , a multi winding generator having a plurality of independent sets of control windings and a plurality of independent power electronic converters for controlling each set of control windings independently ,the method comprising:in a normal operation mode, the plurality of power electronic converters controlling the sets of control windings in substantially the same way, andin a positioning mode for positioning a rotor of a wind turbine in one of one or more predetermined angular positions, one of the independent power electronic converters controlling its corresponding set of control windings in a substantially different manner than at least one other independent power electric converter.2. A method according to claim 1 , wherein in the positioning mode claim 1 , one of the power electronic converters generates a torque in its corresponding set of control windings to substantially compensate for an instantaneous aerodynamic torque.3. A method according to claim 1 , wherein in the positioning mode claim 1 , two or more of the power electronic converters together ...

OFFSHORE COMBINED POWER GENERATION SYSTEM

A combined offshore system for generating electricity includes of an offshore windmill unit with a generator for extracting power from wind and transferring it into electricity, a electricity export cable connected to the windmill for exporting produced electricity to offshore or onshore consumers, and at least one offshore wave power unit for extracting power from waves. This offshore wave power unit is characterized in that electricity produced by the wave power unit is transferred via the same electricity export cable as the electricity generated by the windmill unit. 1. A combined offshore system for generating electricity , comprising:an offshore windmill unit with a generator configured to extract power from wind and transfer the extracted power into electricity, the windmill unit being a floating unit;an electricity export cable connected to the windmill unit to export produced electricity to offshore or onshore consumers; andat least one offshore wave power unit configured to extract power from waves, electricity produced by the offshore wave power unit being transferred via the same electricity export cable as the electricity generated by the windmill unit.2. The combined offshore system according to claim 1 , wherein the offshore wave power unit is connected to the windmill unit via an energized connection.3. The combined offshore system according to claim 1 , wherein the wave power unit is provided with a power take-off system and a generator that transfers power from waves into electrical power.4. The combined offshore system according to claim 1 , wherein the energized connection between the wave power unit and the wind mill is an electricity cable.5. The combined offshore system according to claim 4 , further comprising an electricity converting system of the wave power unit placed within the windmill unit claim 4 , the electricity converting system converting mechanical energy produced by the wave power unit into electricity exported via the ...

PITCH DRIVE SYSTEMS AND METHODS

A wind turbine pitch drive system comprises an electric grid for supplying electrical power, a motor for driving a pitch actuator, an electronic converter for controlling the motor and a back-up energy storage unit for supplying electrical power. The electronic converter comprises a DC-link capacitor bank. The system furthermore comprises a switching device for selectively connecting the DC-capacitor bank link to the back-up energy storage unit, and a frequency generator for controlling the switching device. Also disclosed is a method for protecting a component of the electronic converter. 2. The system according to claim 1 , wherein the back-up energy storage unit comprises at least one ultra-capacitor.3. The system according to claim 1 , wherein the back-up energy storage unit comprises at least one battery.4. The system according to claim 1 , wherein the switching device is an insulated gate bipolar transistor.5. The system according to claim 1 , wherein the frequency generator is a pulse generator.6. The system according to claim 1 , wherein the switching device uses a frequency generated by the frequency generator to apply pulse width modulation to control a discharge current of the back-up energy storage unit.7. The system according to claim 1 , wherein the switching device uses a frequency generated by the frequency generator to apply pulse frequency modulation to control a discharge current of the back-up energy storage unit.8. A method for protecting a component of the electronic converter in the wind turbine pitch drive system of claim 1 , the method comprising:detecting a difference between a voltage level of the DC-link capacitor bank of the electronic converter and a voltage level of the back-up energy storage unit;generating a high frequency pulse, from the frequency generator, based on the detected difference in voltage level; andusing the high frequency pulse to intermittently switch the switching device on and off to control an in-rushing current ...

WIND TURBINE OPERATION BASED ON A FREQUENCY OF AN AC OUTPUT VOLTAGE SIGNAL PROVIDED BY A POWER CONVERTER OF THE WIND TURBINE

A method for controlling the operation of a wind turbine which includes a mechanical drive train, an electric generator being mechanically connected to the drive train, and a power converter being electrically connected to the generator is provided. The method comprises (a) determining a frequency of an AC output voltage signal provided by the power converter; (b) recognizing, whether there has been a modification of the determined frequency with respect to a previously determined frequency, which modification is larger than a given threshold; (c) if the modification of the determined frequency is larger than the given threshold, changing a power reference signal for the wind turbine; (d) providing the changed power reference signal to a controller of the wind turbine; and (e) controlling the operation of the wind turbine on the basis of the changed power reference signal. 1240. A method for controlling the operation of a wind turbine including (i) a mechanical drive train , (ii) an electric generator being mechanically connected to the drive train , and (iii) a power converter () being electrically connected to the generator , the method comprising:determining a frequency of an AC output voltage signal provided by the power converter;recognizing, whether there has been a modification of the determined frequency with respect to a previously determined frequency, which modification is larger than a given threshold;if the modification of the determined frequency is larger than the given threshold, changing a power reference signal for the wind turbine;providing the changed power reference signal to a controller of the wind turbine; andcontrolling the operation of the wind turbine on the basis of the changed power reference signal.2. The method as set forth in claim 1 , whereinthe frequency is determined at a node of a power transmission system connecting the power converter with a power grid, wherein the power transmission system comprises a High Voltage Direct ...

OPERATING A WIND TURBINE BEING CONNECTED TO A UTILITY GRID SOLELY VIA A HVDC POWER CONNECTION WITH A NETWORK BRIDGE CONTROLLER PERFORMING A POWER AND A VOLTAGE CONTROL

A method for controlling the operation of a wind turbine is provided. The method includes (a) receiving an active power reference signal) and an active power feedback signal; (b) determining, based on the active power reference signal and the active power feedback signal, a first voltage control signal and a power controller frequency signal; (c) determining, based on the power controller frequency signal, a second voltage control signal; (d) determining, based on the frequency reference signal, a frequency controller frequency signal; (e) determining, based on the power controller frequency signal and the frequency controller frequency signal, an actual angle signal being indicative for an actual angle of a rotating dq reference frame; and (f) controlling the operation of a power converter of the wind turbine based on the first voltage control signal, the second voltage control signal, and the actual angle signal. 2. The method as set forth in claim 1 , wherein the actual angle signal further depends on a nominal frequency reference signal being indicative for the desired frequency of an AC system which collects AC power generated by the wind turbine and by other wind turbines of the wind park.3. The method as set forth in claim 1 , wherein the frequency controller receives the frequency reference signal via a filter claim 1 , in particular via a low pass filter.4. The method as set forth in claim 1 , wherein an angular speed signal representing the rotational frequency of a rotating dq reference frame with respect to a stationary abc reference frame and being fed directly into the theta integrator unit is also fed to the frequency controller such that the frequency controller frequency signal produced by the frequency controller is determined further based on this angular speed signal.5. The method as set forth in claim 1 , wherein the actual angle signal further depends on a frequency modification signal claim 1 , wherein the frequency modification signal is ...

WIND POWER GENERATION SYSTEM, DEVICE USING WIND POWER GENERATION SYSTEM, AND METHOD FOR OPERATING SAME

A wind turbine able to generate power irrespective of a presence of and a state of a power grid is disclosed. Specifically, a wind power generation system is provided with a wind turbine, the wind turbine including a blade that rotates in response to the wind, a generator that rotates with rotation of the blade to generate power, and an auxiliary machine that controls a pitch angle of the blade. The auxiliary machine is driven by the generated power of a downwind type wind turbine to which a permanent magnet type generator is mounted and which generates power in a state in which a blade of the downwind type wind turbine rotating in response to the wind faces downwind. 1. A wind power generation system comprising a wind turbine ,the wind turbine including:a blade that rotates in response to wind;a generator that rotates with rotation of the blade to generate power; andan auxiliary machine that controls a pitch angle of the blade,wherein the auxiliary machine is driven by generated power of a downwind type wind turbine to which a permanent magnet type generator is mounted and which generates power in a state in which a blade of the downwind type wind turbine rotating in response to wind faces downwind.2. A wind power generation system comprising a wind turbine ,the wind turbine including:a blade that rotates in response to wind;a generator that rotates with rotation of the blade to generate power; andan auxiliary machine that controls a pitch angle of the blade,wherein an excitation type generator and a battery that provides an initial excitation power for the excitation type generator are mounted,wherein excitation power of the excitation type generator during power generation is provided by generated power of the excitation type generator, the battery is charged by the generated power of the excitation type generator, andthe auxiliary machine is driven by generated power of a downwind type wind turbine that generates power in a state in which a blade of the downwind ...

Petroleum-Alternative Power Plant

The present disclosure includes a petroleum-alternative power plant system harvesting wind, solar, and thermal energies. The system may include at least one two-wind-turbine power tower building where the outside surface of the building is divided into a number of sections. Each section forms a funnel- shaped duct to guide and accelerate the wind streams toward the vanes of the first wind turbine; then wind streams accelerated further and guided toward the vanes of a second wind turbine. The system may also include solar receptors, solar tower, and thermal receptors to harvest more energy. A management control subsystem is provided to combine electricity, and selectively delivering electricity to any electric load, a non-fossil fuel production subsystem, and the power grid. 1. A power plant system to generate electricity , said power plant system comprising:at least one power tower building structure having a top portion, a bottom portion, an outside surface, a hollow center portion, said hollow center portion connects the top portion with the bottom portion, a first room placed at the bottom portion of said building structure, a second room placed at the top portion of said building structure, and a conduit subsystem connects the top portion and the bottom portion of said building structure;a wind collection and accelerating subsystem;a wind receptor subsystem;a management control subsystem;wherein the wind receptors subsystem converts wind energy to electricity using wind receptors;said wind receptors subsystem comprising: a first wind turbine provided at the bottom portion of the building structure and a second wind turbine provided at the top portion of the building structure and housed in the said second room;said first wind turbine body is placed in the said first room and the first wind turbine blades are placed at the hollow portion of said building structure, wherein a horizontal barrier is provided around the shaft of the first wind turbine to prevent ...

Hybrid Energy Harvesting Device and Fixed Threshold Power Production

Systems and methods here are described for harvesting energy, certain embodiments including a power generator, a rotatable base attached to the power generator, one or more protruding blades attached to the rotatable base, a kinetic energy harvesting device mounted on the base, and a gear shaft for associating the base with the power generator. 1. A system for harvesting energy , comprising:a power generator;a rotatable base attached to the power generator;one or more protruding blades attached to the rotatable base;a kinetic energy harvesting device mounted on the base; anda gear shaft for associating the base with the power generator.2. The system of claim 1 , wherein a photovoltaic cell is attached to a surface area of the one or more protruding blades.3. The system of claim 1 , wherein the one or more blades are curved.4. The system of claim 1 , wherein the kinetic energy harvesting device is placed between the protruding blades attached to the rotatable base.5. The system of claim 1 , wherein the kinetic energy harvesting device includes piezoelectric cells.6. The system of claim 1 , wherein the kinetic energy harvesting device includes flexible elastomers.7. The system of further wherein the kinetic energy harvesting device is a stationary microphoned kinetic receiver is placed between the protruding blades attached to the rotatable base.8. The system of further comprising a parallel circuit electrically connected to the power generator and the kinetic energy harvesting device.9. The system of further comprising a charge control circuit connected to the parallel circuit.10. The system of further comprising a wireless power transfer connected to the charge control circuit.11. The system of further comprising a battery is in electrical connection with the charge control circuit.12. The system of further comprising a power grid is in electrical connection with the charge control circuit.13. The system of further wherein the charge control circuit includes a Metal ...

Vertial axis wind/solar turbine

The first goal in this design is to combine Wind and Solar energy creating a new system that will increase the efficiency of the power collection system and which will therefore operate at a higher power density than conventional horizontal axis wind turbines (HAWT). The second goal is to store the generated energy where it is generated efficiently. The design is designated as a Vertical Axis Solar Turbine (VAST) which maybe suitable for grid power application. The unique method of construction of the VAST would be more visually appealing to the communities that will use it. Further there would be less risk of killing flying animals and insects and the noise level would also be less as there are no spinning blades. The VAST encompasses prior work done in three different fields; wind power, solar PV and energy storage

POWER-RAMPING PITCH FEED-FORWARD

Embodiments of the present disclosure generally relate to apparatus and methods for preventing power dips associated with power ramping in wind turbines. One embodiment of the present disclosure provides a method for stabilizing power output in a wind turbine, which includes tracking a rate of change in an external reference, such as an external power reference or external torque reference, computing a feed-forward pitch angle adjustment according to the rate of change in the external power reference, and sending the feed-forward pitch angle adjustment to the wind turbine to adjust a pitch angle of rotor blades simultaneously with adjusting power output according to the external reference. 1. A method for stabilizing power output in a wind turbine , comprising:tracking a rate of change in an external reference;computing a feed-forward pitch angle adjustment according to the rate of change in the external reference;computing, in an existing pitch controller, a feed-back pitch angle adjustment based on a measured generator speed;combining the feed-forward pitch angle adjustment and the feed-back angle adjustment; andsending the feed-forward pitch angle adjustment to the wind turbine to adjust a pitch angle of rotor blades.2. The method of claim 1 , wherein the external reference is one of external power reference and external torque reference.3. The method of claim 2 , wherein sending the feed-forward pitch angle adjustment to the wind turbine comprises:sending the feed-forward pitch angle adjustment through an integral controller of the existing pitch controller.8. The method according to claim 1 , wherein the feed-forward pitch angle adjustment is computed taking into account the rotor speed (Ω).9. The method according to claim 1 , wherein the feed-forward pitch angle adjustment is compensated for induction lag by filtering using a lag compensator.10. The method of claim 1 , further comprising:prior to sending the feed-forward pitch angle adjustment to the wind ...

FLYWHEEL ENERGY STORAGE DEVICE, WIND POWER GENERATION SYSTEM AND VEHICLE ENERGY FEEDBACK BRAKE SYSTEM

Provided is a flywheel energy storage device including a radial magnetic gear, the radial magnetic gear includes an inner rotor, an outer rotor and Nfirst magnetic pole adjustment sheets embedded in a first magnetic pole adjustment sheet base; a disc-type magnetic gear electric motor includes a first stator disc, a first rotor disc, a second stator disc, a second rotor disc and a third rotor disc, the first stator disc with the first rotor disc form a first disc-type electric motor, the second stator disc with the second rotor disc form a second disc-type electric motor, and a disc-type magnetic gear is formed by the first rotor disc, the second rotor disc and the third rotor disc, and the first disc-type electric motor, the second disc-type electric motor and the disc-type magnetic gear are couple with one another to form the disc-type magnetic gear electric motor. 1. A flywheel energy storage device , comprising:a vacuum shell, a flywheel, a radial magnetic gear, a disc-type magnetic gear electric motor and a second rotation shaft; wherein,the vacuum shell comprises a vacuum shell body, a first magnetic pole adjustment sheet base and an end cover; the vacuum shell defines a vacuum accommodating cavity surrounded by the vacuum shell, and the first magnetic pole adjustment sheet base is installed between the vacuum shell body and the end cover;the flywheel is accommodated in the accommodating cavity and comprises a first rotation shaft, and the first rotation shaft is rotatably installed to the vacuum shell body;{'sub': 1', '1, 'the radial magnetic gear comprises an inner rotor, an outer rotor and Nfirst magnetic pole adjustment sheets; the inner rotor is located at the inside of the first magnetic pole adjustment sheet base, and the outer rotor is located at the outside of the first magnetic pole adjustment sheet base; the inner rotor is coaxially fixed with the first rotation shaft, and the inner rotor is provided with a first permanent magnet; the outer rotor is ...

Electrical power circuit and method of operating same

The present subject matter is directed to an electrical power circuit connected to a power grid and method of operating same. The electrical power circuit has a power converter electrically coupled to a generator, such as a doubly-fed induction generator, having a rotor and a stator. Thus, the method includes operating rotor connections of the rotor of the generator in a wye configuration during a first rotor speed operating range. Further, the method includes monitoring a rotor speed of the rotor of the generator. Thus, the method also includes transitioning the rotor connections of the rotor from the wye configuration to a delta configuration if the rotor speed changes to a second rotor speed operating range.

Wind turbine and method for operating a wind turbine

The invention relates to a wind turbine that comprises a rotor ( 106 ) having at least two rotor blades ( 108 ), an electrical generator that is directly or indirectly coupled to the rotor ( 106 ) of the wind turbine and said generator generates electrical power while the rotor ( 106 ) rotates, and a control unit ( 120 ) for controlling the operation of the wind turbine. The control unit ( 120 ) activates a first malfunction operating mode if parameters of a supply network exceed or fall below a threshold value. The control unit ( 120 ) is embodied in the first operating mode for the purpose of reducing the rotational speed of the rotor ( 106 ) to zero and for the purpose of activating a consumer ( 400 ) in order to consume, by means of the consumer ( 400 ), the electrical power that is generated in the malfunction operating mode by means of the generator.

Method to detect or monitor the demagnetization of a magnet

A method to detect a decrease of the demagnetization of permanent magnets of the generator of a wind turbine, wherein a frequency converter is able to adapt to the variable frequency of the generator output voltage to the frequency of a power grid, wherein the AC/DC converter or the DC/AC converter of the frequency converter is been disabled, the electrical connections between the generator and the frequency converter are switched on via circuit breakers, the generator speed is determined; the generator output voltage is determined by a voltage sensor which is part of the frequency converter, the magnetic flux density of the generator is calculated depending on the generator speed and the generator output voltage, a demagnetization event is determined by comparing the resulting flux density value with a predetermined flux density value is provided.

BATTERY-SUPPORTED BRAKING SYSTEM FOR A WIND TURBINE

The present disclosure is directed to a protection system for a wind turbine power system connected to a power grid. The protection system includes a main brake circuit having at least one brake resistive element and at least one brake switch element, a battery system, and a controller. The brake resistive element is coupled to at least one of a DC link of a power converter of the wind turbine power system, windings of a rotor of the generator, or windings of a stator of a generator of the wind turbine power system via the brake switch element. The battery system is coupled to the generator via a battery switch element. In addition, the controller is configured to disconnect the power converter and the generator from the power grid and connect at least one of the main brake circuit or the battery system to the generator in response to detecting an electromagnetic (EM) torque loss event so as to generate an EM torque. 1. A protection system for a wind turbine power system connected to a power grid , the wind turbine power system having a generator with a stator and a rotor and a power converter having a rotor-side converter , a grid-side converter , and a DC link configured therebetween , the protection system comprising:a main brake circuit having at least one brake resistive element and at least one brake switch element, the brake resistive element coupled to at least one of the DC link of the power converter, windings of the rotor of the generator, or windings of the stator of the generator via the brake switch element;a battery system coupled to the generator via a battery switch element; and,a controller configured to disconnect the power converter and the generator from the power grid and connect at least one of the main brake circuit or the battery system to the generator in response to detecting an electromagnetic (EM) torque loss event so as to generate an EM torque.2. The protection system of claim 1 , further comprising a first switch element coupled ...

Wind power plant having frequency measurement

A method for controlling a wind turbine which is connected to an electrical grid, detects a grid frequency present in the grid and in the case of which the power output is regulated on the basis of the grid frequency by a controller and, in particular, switches off the power feed into the electrical grid if a limit value of a grid frequency is exceeded, wherein a change in the grid frequency over time is detected, a rate of change is determined and the rate of change is compared with a rate of change limit value and a modified frequency value is used to regulate the power output in the event of the rate of change limit value being exceeded.

INERTIAL CONTROL METHOD OF WIND TURBINE

An inertial control method of a wind turbine includes the steps of: acquiring frequency information of a power grid; calculating a time variant droop coefficient when the frequency information is reduced below a preset range; and controlling the wind turbine using the calculated time variant droop coefficient, wherein the step of calculating a time variant droop coefficient includes the steps of: collecting rotor speed information changing according to the inertial control; and calculating the time variant droop coefficient using the collected rotor speed information. 1. An inertial control method of a wind turbine , the method comprising the steps of:acquiring frequency information of a power grid;calculating a time variant droop coefficient when the frequency information is reduced below a preset range; andcontrolling the wind turbine using the calculated time variant droop coefficient,wherein the step of calculating a time variant droop coefficient includes the steps of:collecting rotor speed information in real time which is changing according to the inertial control; andcalculating the time variant droop coefficient using the collected rotor speed information.2. The method according to claim 1 , wherein the step of calculating a time variant droop coefficient includes the steps of:calculating kinetic energy of a rotor using the rotor speed information; andcalculating the time variant droop coefficient by comparing the calculated kinetic energy and maximum kinetic energy of the rotor.3. The method according to claim 2 , wherein the step of calculating the time variant droop coefficient is characterized in that deriving the time variant droop coefficient which makes the kinetic energy of the rotor and the energy released from the wind turbine have a positive correlation.4. The method according to claim 3 , wherein a lower limit of the time variant droop coefficient is determined within a range that the rotor speed is not reduced below the minimum operating speed. ...

SYSTEM AND METHOD FOR CONTROLLING A NEGATIVE SEQUENCE CURRENT IN A WIND TURBINE GENERATOR

The present disclosure is directed to a system and method for controlling an electrical power system connected to a power grid. The method includes determining, via a negative sequence regulator programmed in a controller of the electrical power system, a negative sequence component of at least one electrical condition of the electrical power system. Further, the method includes determining a desired current response based on the negative sequence component of the at least one electrical condition of the electrical power system. Thus, the method also includes determining a control command for the power converter as a function of the desired current response so as to achieve a desired relationship between a voltage condition in the power grid and the negative sequence component of the electrical condition of the electrical power system. 1. A method for controlling an electrical power system connected to a power grid , the electrical power system having a power converter electrically coupled to a generator , the method comprising:determining, via a negative sequence regulator programmed in a controller of the electrical power system, a negative sequence component of at least one electrical condition of the electrical power system;determining a desired current response based on the negative sequence component of the at least one electrical condition of the electrical power system; and,determining a control command for the power converter as a function of the desired current response so as to achieve a desired relationship between a voltage condition in the power grid and the negative sequence component of the electrical condition of the electrical power system.2. The method of claim 1 , wherein the control command comprises a modulation index command for the power converter.3. The method of claim 1 , further comprising determining the desired current response as a function of a desired negative sequence admittance characteristic of the electrical power system.4. The ...

ELECTROSTATIC INDUCTION GENERATOR FOR CREATING HIGH VOLTAGE DIRECT CURRENT

Systems and methods for generating a high voltage direct current using electric-field generators are disclosed. The electric field generator can comprise a rotor member, rotor poles coupled to the rotor member, stator poles corresponding to the rotor poles, and a dielectric medium positioned between the corresponding stator and rotor poles. The method can comprise applying an electric field between corresponding stator and rotor poles, receiving a mechanical energy input causing the rotor member to rotate, changing an alignment of the corresponding stator and rotor poles as a result of the rotation of the rotor member, increasing the voltage of the electric field between the corresponding stator and rotor poles as a result of the alignment change of the corresponding stator and rotor poles, and discharging the electric field to place a charge on a DC bus when the voltage of the electric field reaches a predetermined level. 1. A method of generating a high voltage direct current using an electric-field generator , the electric field generator comprising a rotor member , a plurality of rotor poles coupled to the rotor member , a plurality of stator poles corresponding to the rotor poles , and a dielectric medium positioned between the corresponding stator and rotor poles , the method comprising:applying an electric field between corresponding stator and rotor poles;receiving a mechanical energy input causing the rotor member to rotate;changing an alignment of the corresponding stator and rotor poles as a result of the rotation of the rotor member;increasing the voltage of the electric field between the corresponding stator and rotor poles as a result of the alignment change of the corresponding stator and rotor poles; anddischarging the electric field to place a charge on a DC bus when the voltage of the electric field reaches a predetermined level.2. The method of claim 1 , wherein the plurality of stator poles are located on a perimeter of a plurality of stator ...

METHOD FOR OPERATING A WIND TURBINE, AND A CORRESPONDING WIND TURBINE

The invention relates to a method for operating a wind turbine () comprising a rotor () and a generator (), connected to said rotor (), for outputting electrical power to an electrical grid, said rotor () comprising rotor blades () whose blade pitch angles (a) may be moved during operation in order to control the rotational speed (n) of the rotor (). Upon reaching a rotational speed (n) higher than a rotational speed limit (n) that delimits an operational range (″) of said wind turbine (), the rotor () is forcibly braked by increasing the blade pitch angle (α) at a predefined positive blade pitch angle movement rate (ω), particularly at a maximum potential positive blade pitch blade angle movement rate (ω). According to the invention, the rotational speed limit (n) is altered as a function of a blade pitch angle movement rate (ω) set by the control. The invention also relates to a corresponding wind turbine (). 112.-. (canceled)13. A method for operating a wind turbine having a rotor and a generator connected to the rotor for outputting electrical power to an electric grid , wherein the rotor includes rotor blades , whose blade pitch angle may be moved for the purpose of controlling the rotational speed of the rotor during operation , and wherein the rotor at a rotational speed above a rotational speed limit delimiting an operational range of the wind turbine is forcibly braked by increasing the blade pitch angle at a predefined positive blade pitch angle movement rate , in particular , at a maximum potential positive blade pitch angle movement rate , characterized in that the rotational speed limit is changed as a function of a blade pitch angle movement rate set by the control.14. The method of claim 13 , characterized in that the change of the rotational speed limit as a function of the blade pitch angle movement rate set by the control is a temporary change within a time span predefined by the control.15. The method of claim 13 , characterized in that the ...

WIND TURBINE

A device and method to generate electricity via a wind turbine. The device includes a first stator ring or a portion thereof, a second rotor comprising a ring encircling a set of blades, and wherein a rotation of the second rotor ring with respect to the first stator ring or the portion thereof generates energy. 1. A wind turbine device for generating energy , the device comprising:a first stator ring or a portion thereof;a second rotor comprising a ring encircling a set of blades; and,wherein a rotation of the second rotor ring with respect to the first stator ring or the portion thereof generates energy.2. The device of claim 1 , wherein the energy is generated by inductance.3. The device of claim 2 , comprising one or more electromagnets and one or more coils.4. The device of claim 3 , wherein said one or more electromagnets is coupled to the second rotor ring and said one or more coils is coupled to the first stator ring.5. The device of claim 3 , wherein said one or more coils comprises a variator for varying an effective length of said one or more coils.65. The device of any of through claims 1 , wherein the set of blades of the second rotor wing converge so as to leave a central void.7. The device of claim 6 , wherein the set of blades converge to a holding structure comprising the central void.8. The device of claim 7 , wherein the holding structure comprises a ring.98. The device of any of through claims 1 , comprising a support structure that supports the first stator ring or the portion thereof.10. The device of claim 9 , wherein the support structure is configured so as to be away from a generating air flow.1110. The device of any of through claims 1 , comprising a braking system for braking the second rotor ring.1211. The device of any of through claims 1 , wherein a rotation of the second rotor ring with respect to the first stator ring is configured to be directly translated into the generated energy.13. A method for generating energy comprising: ...

FAULT HANDLING SYSTEM FOR DOUBLY FED INDUCTION GENERATOR

Fault Ride Through (FRT) transient management system configured to enhance the FRT capability doubly-fed induction generator (DFIG)-based wind turbines. A grid side converter (GSC) introduces shunt and series compensation for normal operation and voltage dips, respectively. A braking resistor may be added to smooth switching transients from shunt to series interfaces and dissipate excessive power from the GSC. To attain a flexible control solution for balanced and unbalanced fault conditions, the transient management scheme may employ positive and negative sequence controllers. The system dynamics for the series compensation topology may be analyzed using small-signal linear model. Based on the mathematical model, the controller may be tuned to balance voltage regulation performance and transient stability margins with consideration of various operating conditions. The system benefits from a low component count, simple protection structure, and improved FRT performance with effective compensation to the electric grid. 1. A system , comprising:a doubly fed induction generator (DFIG) comprising a rotor and a stator coupled to an electrical grid, the DFIG being configured to generate power for the electrical grid;rotor-side converter (RSC) circuitry coupled to at least the rotor, the RSC circuitry being configured to control the power generation on the rotor side of the DFIG;grid-side converter (GSC) circuitry coupled to at least the electrical grid, the GSC being configured to control the power generation on the grid side of the DFIG; andfault handling circuitry coupled to at least the GSC, the fault handling circuitry being configured to convert the system from a shunt connection configuration to a series compensation configuration on the occurrence of a fault.2. The system according to claim 1 , wherein the fault handling circuitry comprises at least three switches and a transformer claim 1 , the at least three switches being configured to connect the transformer in ...

SYSTEM AND METHOD FOR OPTIMIZING WIND TURBINE OPERATION

The present disclosure is directed to a system and method for optimizing operation of a wind turbine. The method includes providing a voltage regulator between a power grid and the wind turbine. The voltage regulator is configured to control at least one voltage condition of the wind turbine. Another step includes monitoring, via one or more sensors, at least one operating condition and at least one voltage condition of the wind turbine. The method also includes comparing, via a controller, at least one of the operating condition or the voltage condition with a predetermined threshold to determine a margin-to-threshold ratio. Thus, a further step includes controlling the voltage regulator based on the comparison so as to maximize the margin-to-threshold ratio. 1. A method for optimizing operation of a wind turbine , the method comprising:providing a voltage regulator between a power grid and the wind turbine, the voltage regulator configured to control at least one voltage condition of the wind turbine;monitoring, via one or more sensors, at least one operating condition and at least one voltage condition of the wind turbine;comparing, via a controller, at least one of the operating condition or the voltage condition with a predetermined threshold to determine a margin-to-threshold ratio; and,controlling the voltage regulator based on the comparison so as to maximize the margin-to-threshold ratio.2. The method of claim 1 , further comprising monitoring claim 1 , via the controller claim 1 , a grid voltage of the power grid and controlling the voltage regulator based on the grid voltage and the comparison so as to maximize the margin-to-threshold ratio.3. The method of claim 1 , wherein the operating condition comprises any one of or a combination of the following: generator speed claim 1 , VAR demand claim 1 , a power factor claim 1 , or power output.4. The method of claim 1 , wherein the voltage condition comprises any one of or a combination of the following: ...

SYSTEM AND METHOD FOR IMPROVING REACTIVE CURRENT RESPONSE TIME IN A WIND TURBINE

The present disclosure is directed to a system and method for improving reactive current response time in a renewable energy power system connected to a power grid. The method includes providing, via a controller of the power system, a permissive logic relating to the power grid. Another step includes determining, via a controller of the renewable energy power system, a reactive current reference command for the renewable energy power system in response to the permissive logic being satisfied. The method also includes generating, via the controller, a reactive current pulse command for the renewable energy power system. Thus, the controller is configured to determine a total reactive current command by combining the reactive current reference command and the reactive current pulse command. Further, the method includes operating the renewable energy power system based on the total reactive current command so as to improve the current response time. 1. A method for improving reactive current response time of a renewable energy power system connected to a power grid , the method comprising:providing, via a controller of the renewable energy power system, a permissive logic relating to the power grid;in response to the permissive logic being satisfied, determining, via the controller, a reactive current reference command for the renewable energy power system and generating a reactive current pulse command for the renewable energy power system;determining, via the controller, a total reactive current command by combining the reactive current reference command and the reactive current pulse command; and,operating the renewable energy power system based on the total reactive current command so as to improve the current response time of the renewable energy power system.2. The method of claim 1 , wherein the permissive logic comprises at least one of an occurrence of an adverse grid voltage event claim 1 , timing to delay the reactive current pulse command claim 1 , timing ...

System and method for reducing wind turbine oscillations caused by grid faults

The present disclosure is directed to a system and method for operating a wind turbine in response to one or more grid events or faults occurring in a power grid. The method includes monitoring, via one or more sensors, a grid voltage of the power grid so as to detect one or more grid events occurring in the power grid. In response to detecting at least one grid event, a controller determines an operating catch point for the wind turbine component and applies a torque demand to the wind turbine component when the operating catch point is reached. Further, the torque demand may be based on an initial torque demand acting on the wind turbine component before the one or more grid events occurred. Therefore, applying the torque demand to the wind turbine component is configured to reduce oscillations occurring in the component caused by one or more grid faults.

WIND POWER CONVERTER DEVICE AND CONVERTER DEVICE

A wind power converter device is provided. The wind power converter device includes grid side converters, generator side converters and a DC bus module. Each of the grid side converters includes grid side outputs electrically coupled to a grid and a first and a second DC inputs. Each two of the neighboring grid side converters are connected in series at the second and the first DC inputs. Each of the generator side converters includes generator side inputs electrically coupled to a generator device and a first and a second DC outputs. Each two of the neighboring generator side converters are coupled in series at the second and the first DC outputs. The DC bus module is electrically coupled between the grid side converters and the generator side converters. 1. A wind power converter device comprising:a plurality of grid side converters each comprising a plurality of grid side outputs electrically coupled to a grid, a first direct current (DC) input and a second DC input, wherein the second DC input of one of any two of the neighboring grid side converters is coupled in series to the first DC input of another one of the two neighboring grid side converters;a plurality of generator side converters each comprising a plurality of generator side inputs electrically coupled to a generator device, a first DC output and a second DC output, wherein the second DC output of one of any two of the neighboring generator side converters is coupled in series to the first DC output of another one of the two neighboring generator side converters; anda DC bus module electrically coupled between the grid side converters and the generator side converters.2. The wind power converter device of claim 1 , wherein the generator side converters comprise a primary generator side converter and a plurality of secondary generator side converters.3. The wind power converter device of claim 1 , further comprising a plurality of secondary generator side control modules each corresponding to one of ...

VARIABLE WIND TURBINE HAVING A POWER DISSIPATING UNIT; A METHOD OF OPERATING A POWER DISSIPATING UNIT IN A WIND TURBINE

A variable speed wind turbine is provided. The variable speed wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator, the power converter comprising a generator-side converter, a grid-side converter and a DC (direct current) link therebetween, a power dissipating unit operatively coupled to the DC-link, and a controller. The controller is adapted to receive a request to reduce power output from the wind turbine, determine a feed forward power signal based on a reference generator power and a desired turbine power, and operate the power dissipating unit based on the feed forward power signal. 1. A variable speed wind turbine comprising:a generator;a power converter for converting at least a portion of electrical power generated by the generator, the power converter comprising a generator-side converter, a grid-side converter and a DC (direct current) link therebetween;a power dissipating unit operatively coupled to the DC-link; and receive a request to reduce power output from the wind turbine;', 'determine a feed forward power signal from the difference between a reference generator power and a desired turbine power, the reference generator power including a ramp down power profile of the generator, and the desired turbine power including a desired ramp down power profile; and', 'operate the power dissipating unit based on the feed forward power signal such that the power output from the wind turbine is decreased at a desired rate., 'a controller, wherein the controller is adapted to2. A variable speed wind turbine of claim 1 , wherein the power dissipating unit comprises at least a switch and one resistor.3. (canceled)4. A variable speed wind turbine of claim 1 , wherein the controller is adapted to operate the power dissipating unit by determining a duty ratio for activating the power dissipating unit.5. A variable speed wind turbine of claim 4 , wherein the controller is adapted to ...

ATMOSPHERIC TRANSDUCTION SYSTEM

Atmospheric Transduction System including a Power Frequency broadcast station, a receiver, and a network. The Power Frequency broadcast station includes a transmitter and a computer server. The receiver is in communication with the Power Frequency broadcast transmitter and also includes a user interface for receiving user input commands comprising a request for information from the Power Frequency broadcast station. The receiver is configured to establish a two-way communication path between the receiver and the Power Frequency broadcast transmitter. The network is in communication with the transducer, controller and the receiver for exchanging information therebetween. In response to oscillation translation and/or rotation of the electronic transducer, portions of forces induced by the mass are transferred to the piezoelectric elements. Electrical energy output by these piezoelectric elements is received in a power controller and can be applied to the battery as self charging. The piezoelectric transducer includes a conductive rotor and bearings, at least one of them incorporating a vibrator of mechanical oscillation, having a piezoelectric transducer converting mechanical vibrations into electric power. 13-. (canceled)4. An atmospheric transduction system comprising:means for recycle recharge by oscillation and frequency in accumulation of environmental positive and negative electricity, maintaining the voltage being collected in a prescribed range, providing an electrical conversion broadcast network; andmeans for collecting the atmospheric electrical power as direct current and then supplies the appropriate power grid, transceiver and capacitates a charge; andmeans for self charging propulsion provides motor characteristics, and frequency engine.51. The atmospheric transduction system in accordance with claim , wherein said means for recycle recharge by oscillation and frequency in accumulation of environmental positive and negative electricity , maintaining the ...

CABLE-SUSPENDED WIND ENERGY GENERATOR

An electrical generation system is based upon sail craft that move between towers through wind power. The system includes at least two support towers (or support structures on buildings, for example), and upper and lower cables extending from one tower to another. At least one sail craft is coupled to the upper and lower cables such that wind moves the sail craft along the cables. Each sail craft is coupled to the upper and lower cables with respective upper and lower modules, one or both of which includes a wheel that rotates as the craft moves along the cables. The wheel is coupled to an electrical generator that that feeds one or both of the cables for further distribution through at least one of the towers. A structure at each tower causes the craft to reverse its direction and travel back and forth between the towers in such a way that sail craft travelling in opposite directions to not block the wind to other craft. 1. A wind energy generator , comprising:at least two support structures;upper and lower cables extending from one tower to another;at least one sail craft coupled to the upper and lower cables such that wind moves the sail craft along the cables;the sail craft being coupled to the upper and lower cables with respective upper and lower modules, one or both of the modules including a wheel that rotates against as the craft moves along the cables, the wheel being coupled to an electrical generator;electrical circuitry operative to feed the electricity produced by the generator to one or both of the cables for further distribution through at least one of the towers; anda structure at the endmost towers causing the craft to reverse its direction and travel back and forth between the towers.2. The wind energy generator of claim 1 , further including:four cables between the towers, including an upper pair of cables and a lower pair of cables; andwherein the structure at each tower causing the craft to reverse its direction is a spiral track ...

METHOD FOR STARTING A WIND TURBINE IN A COLD CLIMATE ENVIRONMENT

A method of starting a wind turbine in a cold climate environment includes providing a wind turbine in the cold climate environment in a stand-still or near stand-still condition; allowing the rotation speed of the rotor to increase during start up of the wind turbine; optimizing heat generation within the gear box; and generating power using the wind turbine, wherein heat generation within the gear box is optimized prior to providing the generated electrical power to an electrical grid. Optimizing heat generation within the gear box may include maximizing internal power losses in the gear box during start up. This may allow the start up to be achieved without using external heaters. Aspects of this method may be used during periods of low wind conditions in cold climate environments so that once sufficient wind conditions are reestablished, the wind turbine is ready for immediate power production. 1. A method of starting a wind turbine in a cold climate environment , comprising:providing a wind turbine in a cold climate environment in a stand-still or near stand-still condition, the wind turbine having a tower, a rotor with at least one blade, a generator for producing electrical power, and a gear box having a main shaft operatively coupled to the rotor and a high speed shaft operatively coupled to the generator, the wind turbine configured to be operatively connected to an electrical grid;allowing the rotation speed of the rotor to increase during start up of the wind turbine;optimizing heat generation within the gear box; andgenerating electrical power using the wind turbine,wherein heat generation within the gear box is optimized prior to providing the generated electrical power to the electrical grid.2. The method according to claim 1 , wherein optimizing heat generation within the gear box comprises maximizing internal power losses in the gear box.3. The method according to claim 2 , wherein maximizing the internal power losses in the gear box comprises ...

METHOD AND RELEVANT SYSTEM FOR CONVERTING MECHANICAL ENERGY FROM A GENERATOR ACTUATED BY A TURBINE INTO ELECTRIC ENERGY

A method and system for converting mechanical energy from a generator operated by a turbine into electric energy to be input into an electric network, comprising the following: 110-. (canceled)13. The method according to claim 12 , wherein the virtual anemometer claim 12 , implemented using substep (C2) claim 12 , is obtained according to the further following substeps:(C2a) training the neural network, in an off-line initial calibration mode of the system, giving to the neural network at least a triad of values of rotation speed, wind speed and total power;(C2b) supplying the rotation speed value, calculated in substep (C1f), to the neural network;{'sub': T', 'T', 'T', 'el, '(C2c) supplying a value of power Pto the neural network, wherein Pis obtained by P=P/η, and η is the efficiency of the electric generator;'}(C2d) obtaining from the output of the neural network an estimated value of wind speed necessary for the whole energy conversion process.14. The method according to claim 13 , wherein the algorithm calculates the reference rotation speed value of the turbine claim 13 , corresponding to the maximum power point claim 13 , using the formula ω=νλ/R claim 13 , wherein λis the optimal value of the known value λ=ωR/ν claim 13 , wherein R is the radius of the turbine and V is the wind instant speed.15. The method according to claim 14 , wherein the reference rotation speed value of the turbine is sent to a control system of the converter for tuning the rotation speed of the turbine and to a control system of an inverter for controlling the input of power into the electric network.17. The method according to claim 16 , wherein during substep C2d weighted sums of Euclidean distances between points are executed claim 16 , comprising the sets of vectors of the input data and the corresponding vectors claim 16 , which constitute weights of neurons claim 16 , in a tridimensional space stored by a 3×n sized data matrix claim 16 , wherein n is the number of neurons of the ...

WIND TURBINE POWER GENERATING APPARATUS AND METHOD OF CONNECTING THE SAME

A wind turbine power generating apparatus includes a wind turbine rotor including at least one blade; a pitch drive part for changing a pitch angle of the at least one blade; a generator configured to be driven by rotational energy of the wind turbine rotor; a circuit breaker for switching a connection state of the generator with respect to a utility grid; and a controller for controlling the wind turbine power generating apparatus. The controller includes a pitch control part configured to control the pitch drive part in a constant rotation-speed control mode for maintaining a rotation speed of the wind turbine rotor at a target rotation speed, before connection of the generator; a connection-condition determination part configured to determine whether a connection determination condition is satisfied; and a connection-command generation part configured to provide the circuit breaker with a connection command to connect the generator to the utility grid. 1. A wind turbine power generating apparatus for generating electric power from wind energy , comprising:a wind turbine rotor including at least one blade;a pitch drive part for changing a pitch angle of the at least one blade;a generator configured to be driven by rotational energy of the wind turbine rotor;a circuit breaker for switching a connection state of the generator with respect to a utility grid; anda controller for controlling the wind turbine power generating apparatus, the controller includinga pitch control part configured to control the pitch drive part in a constant rotation-speed control mode for maintaining a rotation speed of the wind turbine rotor at a target rotation speed, before connection of the generator,{'sub': '1', 'a connection-condition determination part configured to determine whether a connection determination condition is satisfied, the connection determination condition including at least a first condition that, while the pitch drive part is controlled in the constant rotation- ...

System and method for detecting ground brush lifting

The present subject matter is directed to a system and method for detecting lifting of a ground brush of a generator of an electrical power system connected to a power grid so as to prevent damage to the electrical power system (e.g. bearing failure). The method includes monitoring, via at least one sensor, a voltage signal of a rotor shaft of the generator. The method also includes determining at least one characteristic (e.g. amplitude and/or frequency) of the voltage signal for a predetermined time period. Further, the method includes determining whether the at least one characteristic of the voltage signal is above a predetermined threshold, wherein the at least one characteristic of the voltage signal being above the predetermined threshold is indicative of the ground brush being lifted.

DRIVE AND METHOD FOR OPERATING SUCH A DRIVE

A drive of an energy generation system with a drive shaft () has an electrical machine () which is connected to a power system (), and a differential gear mechanism () with three drives and outputs, wherein a first drive is connected to the drive shaft (), an output is connected to the electric machine (), and a second drive is connected to a differential drive () which is connected via a frequency converter () and optionally a transformer () to the power system (). The electric machine () can be connected to the frequency converter () and as result full converter mode can continue to be operated at relatively low wind speeds. 198103986751087. Drive with a drive shaft () , an electrical machine () connected to a power grid () , and with a differential gear () with three drives and three power take-offs , whereby one drive/power take-off is connected to the drive shaft () , one drive/power take-off is connected to the electrical machine () , and one drive is connected to a differential drive () , which is connected via a frequency converter () and optionally a transformer () to the power grid () , characterized in that the electrical machine () can be connected to the frequency converter ().2619. Drive according to claim 1 , wherein the differential drive () is connected to a brake ().38147. Drive according to claim 1 , wherein the electrical machine () can be connected via another transformer () to the frequency converter ().46167. Drive according to claim 1 , wherein the differential drive () is connected via a switch () to the frequency converter ().581510. Device according to claim 1 , wherein the electrical machine () is connected via a switch () to the grid ().61417188717181667. Drive according to claim 5 , wherein the additional transformer () can in each case be connected via a switch ( claim 5 , ) to the electrical machine () and the frequency converter () claim 5 , and these switches ( claim 5 , ) can only be closed if switch () claim 5 , which is connected ...

METHOD AND CONTROL ARRANGEMENT FOR CONTROLLING A REACTIVE POWER SOURCE

The present invention relates to a method for controlling a reactive power source in a wind power plant, the method comprising the steps of providing a wind turbine reactive power control signal and providing an active power reference signal, said active power reference signal being a measure of an active power production of the wind power plant. A control signal for the reactive power source is generated by combining the wind turbine reactive power control signal and the active power reference signal in such a way that the control signal for the reactive power source becomes a weighted signal of the wind turbine reactive power control signal. Moreover, the present invention relates to control units and wind power plants suitable for carrying out the present invention. 1. A method for controlling power output of a wind power plant comprising one or more wind turbines and a non-wind turbine reactive power source , the method comprising:receiving a reactive power control signal for a first wind turbine of the one or more wind turbines; andgenerating a control signal for the reactive power source based on a combination of the reactive power control signal and an active power reference signal representing an amount of active power production of the wind power plant.2. The method of claim 1 , wherein the first wind turbine is a doubly-fed induction generator (DFIG) operating with an active power production sufficiently close to a nominal power level claim 1 , such that a subsequent increase to the active power production would require a corresponding decrease to a reactive power production of the DFIG.3. The method of claim 1 , wherein the reactive power source comprises a capacitive reactive power source.4. The method of claim 3 , wherein the reactive power source comprises a static compensator (STATCOM).5. The method of claim 1 , wherein the reactive power source comprises an inductive reactive power source.6. The method of claim 1 , wherein the reactive power control ...

MEASUREMENT PROCESSING SYSTEM FOR CONDITION MONITORING OF A WIND TURBINE

A measurement processing system suitable for supporting condition monitoring of a wind turbine based upon measurements performed on electrical and mechanical parts of the wind turbine, and, while determining whether the wind turbine is connected to the electrical grid or not, determining information representative for shaft torque of the wind turbine and suited for condition monitoring of the wind turbine, based on said measurements. 1. A measurement processing system suitable for supporting condition monitoring of a wind turbine , comprising: (i) a module for inputting measurements performed on at least one electrical part of the wind turbine; (ii) a module for inputting measurements performed on at least one mechanical part of the wind turbine; (iii) a module for determining whether the wind turbine is connected to the electrical grid or not; and (iv) a computation module adapted for determining information representative for shaft torque of the wind turbine and suited for condition monitoring of the wind turbine , based on said measurements; whereby the determining of such information takes into account whether the wind turbine is connected to the electrical grid or not.2. The measurement processing system of claim 1 , wherein said condition monitoring relates to fatigue issues of one or more of the parts of the wind turbine.3. The measurement processing system of claim 1 , further comprising a module for inputting process signals; wherein the computation module further being adapted for using such process signals.4. The measurement processing system of claim 1 , further comprising a module for inputting on-board control information; wherein the computation module further being adapted for using such on-board control information.5. The measurement processing system of claim 1 , wherein the computation module further being adapted for determining shaft torque of the wind turbine from measurements performed on at least one electrical part of the wind turbine by use ...

WIND POWER GENERATION SYSTEM, METHOD FOR CONTROLLING WIND POWER GENERATION SYSTEM, ROTARY ELECTRIC MACHINE SYSTEM, AND CONTROL DEVICE FOR ROTARY ELECTRIC MACHINE

A wind power generation system according to an aspect of an embodiment includes a rotary electric machine and a temperature rise control unit. The temperature rise control unit causes winding of the rotary electric machine to be energized so that the temperature of the rotary electric machine is raised. 1. A wind power generation system comprising:a rotary electric machine; anda temperature rise control unit that causes winding of the rotary electric machine to be energized so that temperature of the rotary electric machine is raised.2. The wind power generation system according to claim 1 , further comprising:a matrix converter that includes a plurality of bidirectional switches arranged between an AC power supply and the rotary electric machine, and supplies electric power to the rotary electric machine when the temperature rise control unit causes the winding of the rotary electric machine to be energized.3. The wind power generation system according to claim 1 , further comprising:a braking unit that causes the rotary electric machine to stop or rotate at an extremely low speed, whereinthe temperature rise control unit causes the winding of the rotary electric machine to be energized when the braking unit causes the rotary electric machine to stop or rotate at an extremely low speed.4. The wind power generation system according to claim 2 , further comprising:a braking unit that causes the rotary electric machine to stop or rotate at an extremely low speed, whereinthe temperature rise control unit causes the winding of the rotary electric machine to be energized when the braking unit causes the rotary electric machine to stop or rotate at an extremely low speed.5. The wind power generation system according to claim 3 , wherein the temperature rise control unit causes the winding of the rotary electric machine to be energized by controlling torque when the braking unit causes the rotary electric machine to stop or rotate at an extremely low speed.6. The wind ...

WIND TURBINE HAVING A HTS GENERATOR WITH A PLURALITY OF PHASES

The present invention relates to a wind turbine having a wind turbine tower with a nacelle provided on the top to which a rotor hub with one or more wind turbine blades is rotatably mounted by a rotor shaft. A generator is arranged in the nacelle, wherein the superconducting rotor coils induce a current in the stator coils when the rotor is rotated, and wherein the stator coils are arranged in at least four phases. One or more converter modules convert the power output from the generator so that it matches the power of a power grid. The generator side of the converter modules comprises a number of rectifying circuits equal to the phases in the generator, while the power grid side comprises a number of inverting circuits equal to the phases of the power grid. This allows the transient of the electromagnetic brake torque relative to the nominal electromagnetic torque of the generator to be reduced. The ripples of the electromagnetic torque are also reduced since the switching frequency of the converter is increased. This in turn reduces the mechanical stresses occurring in the drive train in the event of a failure or error occurring in one of the converter modules. The present invention also relates to a method of operation of such a wind turbine where the defective converter module is selectively switched off and the wind turbine is put into operation again at a lower operation level. 1. A wind turbine comprising:a wind turbine tower having a top and a bottom;a nacelle arranged on top of the wind turbine tower;a rotor hub rotatably mounted to the nacelle;one or more wind turbine blades mounted to the rotor hub, wherein the wind turbine blades define a rotor plane;a shaft coupled to the rotor hub;a generator coupled to the shaft, the generator having a rotor rotatably arranged in relation to a stator, the rotor comprising at least one superconducting rotor coil and the stator comprising at least one conductive stator coil, wherein the superconducting rotor coils and ...

METHOD OF REGULATING THE POWER OF AN ENERGY CONVERSION INSTALLATION AND ENERGY CONVERSION INSTALLATION DRIVEN BY SUCH A METHOD

This method makes it possible to regulate the power of an energy conversion installation () for converting mechanical energy into electrical energy. The installation () comprises a machine (), an alternator (), a first converter (), an electrical cable () which links the terminals of the alternator () to the first converter (), a second converter (), means of measurement (), a control unit (), the first converter () modulating the frequency and the current of the first electrical signal (S). The method comprises a first prior step in which the value of a first quantity proportional to a reactive power is implemented in the control unit and a main step in which the control unit () determines the drive frequency and the drive current on the basis of an error equal to the difference between the first quantity and a second quantity which is both homogeneous to the first quantity, dependent on the reactive power of the first converter () and determined on the basis of a measured value of the current of the first electrical signal (S). 1100100. A method for regulating the power of an installation () for the conversion of mechanical energy into electrical energy , the installation () comprising:{'b': 1', '10, 'a machine () comprising a rotary mechanical receiver () intended to be traversed by a flow (E),'}{'b': 2', '21', '12', '10, 'an alternator (), the rotor () of which is connected to a hub () of the rotary mechanical receiver (),'}{'b': 41', '2', '2', '341, 'a first converter () which converts a first three-phase electrical signal (S) delivered by the alternator () into a second, DC, electrical signal (),'}{'b': 3', '22', '2', '411', '41, 'an electric cable () which connects the terminals of a stator () of the alternator () to an input () of the first converter (),'}{'b': 42', '421', '412', '41', '422', '42', '41', '42', '42, 'a second converter (), an input () of which is electrically connected to an output () of the first converter () and an output () of which is ...

POWER DISSIPATING ARRANGEMENT IN A WIND TURBINE

A power dissipating arrangement for dissipating power from a generator in a wind turbine is provided. The generator comprises a plurality of output terminals corresponding to a multi-phase output. The power dissipating arrangement comprises a plurality of dissipating units, a plurality of semiconductor switches, a trigger circuit for switching the semiconductor switches and a control unit for controlling the operation of the trigger circuit, thereby controlling the switching of the semiconductor switches. 1. A power dissipating arrangement for dissipating power from a generator in a wind turbine , wherein the generator comprises a plurality of output terminals corresponding to a multi-phase output , the power dissipating arrangement comprises:a plurality of dissipating units, each dissipating unit having a first terminal and a second terminal, wherein the first terminal of each dissipating unit is coupled to each output terminal of the generator;a plurality of semiconductor switches, each semiconductor switch having a first terminal, a second terminal and a gate terminal, wherein the first terminal of each semiconductor switch is coupled to the second terminal of each dissipating unit and the second terminal of the semiconductor switch is coupled to the second terminal of another dissipating unit, such that the second terminal of each dissipating unit is coupled to the first terminal of one semiconductor switch and the second terminal of another semiconductor switch;a trigger circuit coupled to the gate terminals of the plurality of the semiconductor switches for switching the semiconductor switches; anda control unit for controlling the operation of the trigger circuit, thereby controlling the switching of the semiconductor switches.2. The power dissipating arrangement according to claim 1 , where the plurality of semiconductor switches comprise thyristors claim 1 , insulated gate bipolar transistors (IGBT) or metal oxide semiconductor field-effect transistors ( ...

WIND TURBINE DRIP LOOP CABLE SECUREMENT ASSEMBLY

The present disclosure is directed to a wind turbine drip loop cable securement assembly. The assembly includes at least one flexible ring component and a plurality of flexible straps circumferentially mounted to the flexible ring component. More specifically, the flexible ring component has an inner surface and an outer surface separated by a thickness. The inner surface defines an open center configured to receive the one or more cables therein. Further, the flexible straps have a first end and a second end. Thus, the first end is configured to be mounted to an interior wall of a tower of the wind turbine, whereas the second end is configured to be mounted to the outer surface of the ring component so as to minimize movement of the cables. 1. A cable securement assembly for minimizing movement of one or more cables within a wind turbine , the cable securement assembly comprising:at least one flexible ring component comprising an inner surface and an outer surface separated by a thickness, the inner surface defining an open center configured to receive the one or more cables therein; and,at least one flexible strap comprising a first end and a second end, the first end configured for mounting to an interior wall of a tower of the wind turbine, the second end configured for mounting to the outer surface of the ring component.2. The cable securement assembly of claim 1 , further comprising a plurality of flexible straps mounted circumferentially around the flexible ring component.3. The cable securement assembly of claim 2 , wherein the plurality of flexible straps comprise at least one of springs claim 2 , elastic ropes claim 2 , elastic cords claim 2 , or ethylene propylene diene monomer (EPDM) straps.4. The cable securement assembly of claim 1 , wherein the flexible ring component is constructed of at least one of plastic claim 1 , fabric claim 1 , rubber claim 1 , or silicon.5. The cable securement assembly of claim 1 , wherein the one or more cables within the ...

Wind turbine system and method for controlling a wind turbine system by power monitoring

A method for controlling a wind turbine system is provided. The wind turbine system includes a power conversion assembly for converting electrical power into a converted electrical power. The method includes monitoring a power extraction parameter, wherein the power extraction parameter is indicative of the power extracted by the wind turbine system from the wind prior to being converted in the power conversion assembly. The method further includes controlling one or more operational variables of the wind turbine system in response to monitoring the power extraction parameter.

Arrangement and Method for Avoiding Stray Currents in Wind Power Plants

The invention relates to a method and an arrangement for avoiding stray currents in a wind power plant. There is an insulating power source having a galvanic decoupled secondary side, an electrical load coupled to the secondary side of the insulating power source through an electrical conductor and a stray current sensitive mechanical component of the wind power plant. The insulating power source is located at a first side of the stray current sensitive mechanical component and the load is located at a second side of the stray sensitive mechanical component. The electrical conductor is coupled to a common ground potential at the second side. 1. An arrangement for avoiding stray currents in a wind power plant , comprising an insulating power source having a galvanic decoupled secondary side , an electrical load coupled to the secondary side of the insulating power source through an electrical conductor and a stray current sensitive mechanical component of the wind power plant , the insulating power source being located at a first side of the stray current sensitive mechanical component and the load being located at a second side of the stray sensitive mechanical component , wherein the electrical conductor is coupled to a common ground potential at the second side.2. The arrangement according to claim 1 , wherein the insulating power source has a primary side being galvanic decoupled from the secondary side claim 1 , and wherein the primary side is connected to the common ground potential at the first side.3. The arrangement according to claim 2 , wherein the primary side is in a nacelle of the wind power plant and the second side is in a hub of the wind power plant.4. The arrangement according to claim 3 , wherein the electrical load is a pitch drive for adjusting the pitch of a blade of the wind power plant claim 3 , and the stray current sensitive mechanical component is a bearing of the wind power plant.5. A wind power plant comprising the arrangement according ...

SPILLOVER OF REACTIVE CURRENT TO LINE SIDE CONVERTER

Systems and methods for controlling reactive current output of a line converter in a power system are provided. In one example embodiment, a method includes receiving a margin signal determined based at least in part on a stator current margin or a rotor current margin. The method includes determining a spillover margin based at least in part on the margin signal. The method includes determining an adjusted spillover margin using a spillover gain. The method includes determining a reactive current command for a line converter based at least in part on the adjusted spillover margin. The method includes controlling the output of the reactive current by the line converter based at least in part on the reactive current command. The spillover gain is variable based at least in part on a maximum line converter current. 1. A method for controlling a reactive current output of a line side converter used in a power system , the method comprising:(a) obtaining, by one or more control devices, a margin signal determined based at least in part on a stator current margin or a rotor current margin;(b) determining, by the one or more control devices, a spillover margin based at least in part on the margin signal;(c) determining, by the one or more control devices, an adjusted spillover margin using a spillover gain, the spillover gain being variable based at least in part on a line converter current setpoint; and(d) determining, by the one or more control devices, a reactive current command for a line side converter based at least in part on the adjusted spillover margin;(e) controlling, by the one or more control devices, the output of reactive current by the line converter based at least in part on the reactive current command.2. The method of claim 1 , wherein the margin signal represents a minimum of a stator current margin and a rotor current margin.3. The method of claim 2 , wherein the stator current margin is determined based on a difference between a stator current ...

High Frequency Bi-directional AC Power Transmission

A method may involve transmitting power between a tethered aerial vehicle equipped with wind turbines for generating power and a ground station configured to interconnect the generated power to an electrical distribution network. The power may be transmitted using high voltage, high frequency AC electrical signals, and transformers at the ground station and the aerial vehicle can scale the AC voltage for use at the respective locations. Converters at the ground station and the aerial vehicle can then convert the transformed voltage to DC. The AC voltage may be transmitted through the tether at a resonant frequency of the tether based in part on an internal capacitance between multiple conductive paths on the tether. 1. An aerial vehicle comprising:a generator disposed in the aerial vehicle to generate power;a converter disposed in the aerial vehicle to convert the generated power to a high frequency AC voltage;a transformer disposed in the aerial vehicle to transform the high frequency AC voltage to a high voltage transmission level for transmission through a tether to a ground station; andat least one inductor electrically coupled to the transformer, wherein the high frequency AC voltage oscillates at a resonant frequency of the tether, and wherein the resonant frequency is based on an internal tether capacitance of the tether and on the at least one inductor.2. The aerial vehicle of claim 1 , further comprising:DC leads coupled to the converter to provide a DC voltage associated with the generated power; andAC leads coupled to the converter to output the high frequency AC voltage with respect to the DC leads.3. The aerial vehicle of claim 2 , further comprising a plurality of switches included in the converter to reverse polarity of the AC leads with respect to the DC leads while voltage across the AC leads is zero or within a predefined threshold to zero.4. The aerial vehicle of claim 1 , wherein the transformer electrically couples with the tether to provide the ...

METHOD FOR CONFIGURING A WIND ENERGY INSTALLATION, AND WIND ENERGY INSTALLATION

The invention relates to a method for configuring a wind energy installation, comprising the following steps: predetermined parameters associated with the wind energy installation are selected from a control database for the purpose of configuring the wind energy installation, the selected parameters are stored on a mobile data storage medium, the selected parameters are transmitted from the mobile data storage medium to the wind energy installation, the selected parameters are implemented in the wind energy installation, the parameters implemented in the wind energy installation are read out by a monitoring device networked to the wind energy installation and to the control database, and the parameters which have been read out are compared with the predetermined parameters associated with the wind energy installation and stored in the control database. 1. A method for configuring a wind energy installation , the method comprising:selecting predetermined parameters associated with the wind energy installation from a control database for the purpose of configuring the wind energy installation;storing the selected parameters on a mobile data storage medium;transmitting the selected parameters from the mobile data storage medium to the wind energy installation;implementing the selected parameters in the wind energy installation;retrieving the implemented parameters using a monitoring device networked to the wind energy installation and to the control database; andcomparing the implemented parameters with the predetermined parameters associated with the wind energy installation and stored in the control database.2. A method for configuring a wind energy installation , the method comprising:selecting predetermined parameters associated with the wind energy installation from a control database for the purpose of configuring the wind energy installation;storing a data storage medium identifier associated with the selected parameters and with the wind energy installation to ...

Fault tolerant wind turbine converter

A wind turbine is arranged to operate in a fully-functional converter mode and a faulty-converter mode. A plurality of converters are arranged to share electric current in the fully-functional converter mode. The converters are dimensioned not only to operate at nominal active current but to provide an over-current margin to enable reactive current to be produced on top of the nominal active current in the fully-functional converter mode. In the fully-functional converter mode the converters are caused to produce reactive current on top of the nominal active current. In response to a fault of one or more of the converters, operation is changed from the fully-functional converter mode to the faulty-converter mode. In the faulty-converter mode, one or more other converters of the converter system are caused to produce additional active current by using their over-current margin to compensate at least partly for a reduction of active-current production due to the fault of one of the converters, and to reduce the reactive-current production by the other converter correspondingly.

ACTIVE NEUTRAL POINT CLAMPED CONVERTER CONTROL SYSTEM AND METHOD

Unique systems, methods, techniques and apparatuses of an active neutral point clamped converter (ANPC converter). One exemplary embodiment is a power conversion system comprising a grid-side converter, a DC link, a multi-phase ANPC converter coupled to an electric machine, and an electronic control system. The electronic control system is structured to selectably operate in a first mode and a second mode in response to a device failure state of the ANPC converter, the first mode operating the grid-side converter to provide a first DC link voltage and operating the ANPC converter using a first modulation index, and the second mode operating the grid-side converter to provide a second DC link voltage greater than the first DC link voltage and operating the ANPC converter using a second modulation index lower than the first modulation index. 1. A control system for an electric machine including a stator and a rotor , the control system comprising:a first converter including a first plurality of switching devices and structured to be operatively electrically coupled to a power grid;a DC bus structured to receive DC power from the first converter;a multi-phase active neutral point clamped converter (ANPC converter) including a second plurality of switching devices, operatively electrically coupled with the electric machine and the DC bus; andan integrated-circuit based electronic control system comprising:first control components structured to operate the first converter by transmitting a first plurality of activation signals to the first plurality of switching devices of the first converter such that the first converter converts the received power to DC power at a first voltage, to detect a failure of one of the second plurality of the switching devices of the ANPC converter, and to operate the first converter by transmitting the first plurality of activation signals to the first plurality of switching devices of the first converter such that the first converter ...

METHODS FOR OPERATING WIND TURBINE SYSTEM HAVING DYNAMIC BRAKE

Methods for operating a wind turbine system are provided. In one embodiment, a method includes adjusting a threshold direct current (DC) bus voltage for a dynamic brake in a wind turbine power converter above a reference DC bus voltage based on at least one system condition. The method further includes gating the dynamic brake on when an experienced DC bus voltage is equal to or greater than the threshold DC bus voltage, and inputting a dynamic brake condition into a controller when the dynamic brake is gated on. The method further includes determining if a grid fault has occurred, reducing power generation of the wind turbine if no grid fault has occurred, and blocking the power converter if a grid fault has occurred. The method further includes gating the dynamic brake off when the experienced DC bus voltage is less than the threshold DC bus voltage. 1. A method for operating a wind turbine system , the method comprising:adjusting a threshold direct current (DC) bus voltage for a dynamic brake in a wind turbine power converter above a reference DC bus voltage based on at least one system condition;gating the dynamic brake on when an experienced DC bus voltage is equal to or greater than the threshold DC bus voltage;inputting a dynamic brake condition into a controller when the dynamic brake is gated on;determining if a grid fault has occurred;reducing power generation of the wind turbine if no grid fault has occurred;blocking the power converter if a grid fault has occurred; andgating the dynamic brake off when the experienced DC bus voltage is less than the threshold DC bus voltage.2. The method of claim 1 , wherein the step of reducing power generation comprises pitching at least one rotor blade of the wind turbine.3. The method of claim 1 , wherein the step of blocking the power converter comprises gating off at least one of a line side switch or a rotor side switch.4. The method of claim 1 , wherein the grid fault comprises at least one of an open grid ...

WIND TURBINE DECELERATION METHOD AND SYSTEM

A wind turbine includes wind turbine blades, a wind turbine rotor coupled to the wind turbine blades, a wind turbine generator coupled to the wind turbine rotor, a wind turbine converter coupled to the wind turbine generator, a controllable brake comprising one or more sources of controllable rotor torque adjustment for providing a first level of torque adjustment, a discrete brake for more coarsely providing a second level of torque adjustment, and a controller programmed for responding to a deceleration event by determining a required torque adjustment for braking, determining a sequence of applying the controllable brake and the discrete brake for driving a combination of the first and second levels of torque adjustment towards the required torque adjustment, and providing control signals for decelerating the wind turbine. 1. A wind turbine comprising:wind turbine blades;a wind turbine rotor coupled to the wind turbine blades;a wind turbine generator coupled to the wind turbine rotor;a wind turbine converter coupled to the wind turbine generator;a controllable brake comprising one or more sources of controllable rotor torque adjustment for providing a first level of torque adjustment;a discrete brake for more coarsely providing a second level of torque adjustment; anda controller programmed for responding to a deceleration event by determining a required torque adjustment for braking, determining a sequence of applying the controllable brake and the discrete brake for driving a combination of the first and second levels of torque adjustment towards the required torque adjustment, and providing control signals for decelerating the wind turbine.2. The wind turbine of wherein the controller is programmed fordetermining whether a potential first level of torque adjustment from the controllable brake is sufficient to meet the required torque adjustment, andif so, providing control signals for using the controllable brake for providing the required torque adjustment; ...

MAGNETIC STRUCTURE COMBINING NORMAL MODE AND COMMON MODE INDUCTANCE

Magnetic components that can be used to provide normal mode and common mode inductance in a power system, such as a wind-driven doubly fed induction generator system, are provided. The magnetic components can include a structure that combines both normal mode inductors and common mode inductors on a common core. In particular, the magnetic components can include specific winding and core arrangements which couple a common mode inductor and a normal mode inductor onto a single core with at least three legs. The structure of the magnetic components can be smaller in size, can have lower weight, and can have a lower cost than typical solutions to providing common mode and normal mode inductance in a power system. 1. A wind turbine power system , comprising:a wind driven generator configured to generate AC power;a power converter coupled to the generator, the power converter comprising a first converter configured to convert AC power to DC power, a second converter configured to convert DC power to AC power, and a DC bus coupled between the first converter and the second converter; anda magnetic component, the magnetic component comprising a core having a plurality of legs, the plurality of legs comprising a first leg, a second leg, and a third leg, each of the plurality of legs configured to provide a flux path in the core; at least one common mode winding, the at least one common mode winding disposed about the first leg, the at least one common mode winding configured to provide a common mode inductance for the power system; and', 'at least one normal mode winding, the at least one normal mode winding disposed about the second leg, the normal mode winding configured to provide a normal mode inductance for the power system, the at least one common mode winding coupled between the at least one normal mode winding and a DC output of the magnetic component., 'wherein the magnetic component comprises2. The wind turbine power system of claim 1 , wherein the at least one ...

FAULT TOLERANT WIND TURBINE CONVERTER

A wind turbine is arranged to operate in a fully-functional converter mode and a faulty-converter mode. A plurality of converters are arranged to share electric current in the fully-functional converter mode. The converters are dimensioned not only to operate at nominal active current but to provide an over-current margin to enable reactive current to be produced on top of the nominal active current in the fully-functional converter mode. In the fully-functional converter mode the converters are caused to produce reactive current on top of the nominal active current. In response to a fault of one or more of the converters, operation is changed from the fully-functional converter mode to the faulty-converter mode. In the faulty-converter mode, one or more other converters of the converter system are caused to produce additional active current by using their over-current margin to compensate at least partly for a reduction of active-current production due to the fault of one of the converters, and to reduce the reactive-current production by the other converter correspondingly. 1. A method of operating a wind turbine , the wind turbine comprising a generator and an electric-converter system arranged to produce and convert electric power up to a nominal active power to be supplied to an electric grid ,wherein the wind turbine is arranged to operate in at least two different converter modes, that is a fully-functional converter mode and a faulty converter mode,the electric-converter system of the wind turbine comprising a plurality of parallel converters,the converters being dimensioned not only to operate at nominal active current, that is electric current corresponding to nominal active power production, but being dimensioned to provide an over-current margin to enable nominal active power to be produced in the event of a lower-than-nominal grid voltage in the fully-functional converter mode,the method comprising:causing, in the fully-functional converter mode, the ...

METHOD FOR CHARGING A DC LINK OF A WIND TURBINE POWER ELECTRONIC CONVERTER

The present invention relates to a method for charging a DC link of a power converter included in a wind turbine generator, the wind turbine generator comprising a generator side converter connected to an electrical generator and a grid side converter connectable, or connected, to an electrical grid through a grid circuit breaker, and a converter controller arranged to control at least the DC link, the DC link having a DC voltage level, the wind turbine generator comprising a wind turbine rotor arranged to rotate the electrical generator, wherein the method comprises rotating the wind turbine rotor whereby the electrical generator generates electrical power, rectifying the electrical power through at least one diode of the generator side converter in order to pre-charge the DC link to a DC voltage level, closing the grid circuit breaker when the DC voltage level is greater than a threshold level. The invention also relates to a wind turbine generator with a converter controller for controlling pre-charging of a DC link. 1. A method for charging a DC link of a power converter included in a wind turbine generator , the wind turbine generator comprising:a generator side converter connected to an electrical generator,a grid side converter connected to an electrical grid through a grid circuit breaker, anda converter controller arranged to control at least the DC link, the DC link having a DC voltage level, the wind turbine generator comprising a wind turbine rotor arranged to rotate the electrical generator, rotating the wind turbine rotor whereby the electrical generator generates electrical power,', 'rectifying the electrical power through at least one diode of the generator side converter in order to pre-charge the DC link to a DC voltage level, and', 'closing the grid circuit breaker when the DC voltage level is greater than a threshold level., 'wherein the method comprises2. The method according to claim 1 , wherein the method further comprises:controlling the ...

Pre-Charging a Capacitor Bank

Systems and methods of pre-charging a capacitor bank are provided. In particular, a power switch and a current limiting device can be coupled in series between a power source and a capacitor bank. Operation of the power switch can be controlled to limit a peak charging current applied to the capacitor bank during a pre-charging process. In this manner, a duty cycle of a pulse signal can be modified based at least in part on a measured current flowing into the current limiting device. In addition, a voltage at the capacitor bank can be monitored, and the pre-charging process can be ceased when the monitored voltage reaches a threshold. 1. A system for pre-charging a capacitor bank , the system comprising:a power switch coupled in series to a direct current input source;a current limiting device coupled in series between the power switch and a capacitor bank comprising one or more capacitor devices; receiving one or more signals indicative of a charge current associated with the capacitor bank; and', 'controlling operation of the power switch based at least in part on the charge current;, 'a first control device configured to control the operation of the power switch bya second control device configured to determine a capacitor bank voltage at the capacitor bank and to control operation of the first control device based at least in part on the determined capacitor bank voltage.2. The system of claim 1 , wherein the power switch comprises a metal-oxide-semiconductor field-effect transistor.3. The system of claim 1 , wherein the current limiting device comprises an inductor device.4. The system of claim 3 , further comprising a flyback diode coupled between the power switch and ground.5. The system of claim 1 , wherein the first control device is a pulse width modulation controller claim 1 , and wherein controlling the operation of the power switch based at least in part on the charge current comprises:comparing the received one or more signals indicative of the charge ...

CONTROLLING THE ENERGY FLOW FROM AN ELECTRICAL MACHINE WITH UNBALANCED IMPEDANCE

A method, an arrangement and a computer program for controlling an energy flow to a grid, from an electrical alternating current machine with unbalanced impedance, in particular an electrical alternating current generator of a wind turbine, the method comprising: obtaining a first power signal representing a first power command. 1. A method for controlling energy flow to a grid , from an electrical alternating current generator of a wind turbine , the method comprising:obtaining a first power signal representing a first power command,obtaining a second power signal representing a second power command,obtaining a first current signal indicative of a feedback current from the electrical alternating current generator,obtaining a second current signal indicative of a feedback current from a grid converter,determining a first internal signal as a result from a first current reference calculation procedure making use of the first power signal, the first internal signal corresponding to a current command for the electrical alternating current machine,determining a second internal signal as a result from a second current reference calculation procedure making use of the second power signal, the second internal signal corresponding to a current command for the grid converter,determining a first output signal as a result from a first current controller procedure making use of the first current signal and the first internal signal, the first output signal representing a voltage command for a first axle of a machine synchronous rotating frame, the voltage command for the first axle being applicable for controlling the energy flow from the electrical alternating current machine, anddetermining a second output signal as a result from a second current controller procedure making use of the second current signal, the second internal signal and a compensation calculation procedure, the second output signal representing a voltage command for a second axle of the grid synchronous ...

SYSTEM AND METHODOLOGY FOR A WIND TURBINE

A wind turbine having discrete sets of magnets on the turbine support and the turbine rotor, creating repelling forces and spaces therebetween. The reduction of friction between the turbine rotor and the turbine support allows for an increase in energy production and scale of the wind turbines. 1. A wind turbine , comprising:a turbine support having a lower portion and a vertical portion;said lower portion of said turbine support aligned along and extending horizontally outward from a core axis, an upper surface of said lower portion having first magnet means positioned thereon aligned along said core axis;said vertical portion of said turbine support being cylindrically shaped and having second magnet means positioned thereon aligned along said core axis;a turbine rotor having a central portion and a lower portion;said central portion of said turbine rotor configured to concentrically receive said vertical portion of said turbine support therein, said vertical portion being radially inside said central portion, said turbine rotor aligned about said core axis and rotatable thereabout, and having third magnet means positioned on said central portion along said core axis, said third magnet means aligned opposing said second magnet means, the opposition creating and maintaining a first space therebetween;said lower portion of said turbine rotor aligned along and extending outward from said core axis, a lower surface of said lower portion having fourth magnet means positioned thereon aligned along said core axis, said fourth magnet means aligned opposing said first magnet means, the opposition creating and maintaining a second space therebetween;a plurality of blades coupled to said turbine rotor; andat least one generator configured to generate electric power from the movement of said turbine rotor.2. The wind turbine according to claim 1 , wherein said turbine rotor covers said vertical portion of said turbine support.3. The wind turbine according to claim 1 , wherein ...

WIND POWER PLANT FREQUENCY CONTROL

The present invention relates to a method of operating a wind power plant, with at least one wind turbine generator connected to an electrical grid, wherein the method comprises the steps of monitoring a frequency parameter and comparing it with a frequency set point, as to select a low or high frequency event and determining a power reference to the a least one wind turbine generator, based on the frequency parameter, In case a high frequency event is detected, the power reference is determined as a minimum of a selection of at least a first and a second minimum power reference. And in case a low frequency event is detected, the power reference is determined as a maximum of a selection of at least a first and a second maximum power reference, dispatching the power reference to the at least one wind turbine generator. The invention also relates to a wind power plant operating according to the method. 1. A Method of operating a wind power plant , with at least one wind turbine generator connected to an electrical grid , wherein the method comprises:monitoring a frequency parameter and comparing it with a frequency set point, as to select a low or high frequency event; [ [{'sub': 'FC', 'wherein the first minimum power reference is a pre-event electrical power output subtracted a power amount proportionally to the qrid frequency deviation (ΔP) and'}, {'sub': 'FC', 'wherein the second minimum power reference is a pre-event curtailed electrical power reference subtracted a power amount proportionally to the rid frequency deviation (ΔP),'}], 'when a high frequency event is detected, the power reference is determined as a minimum of a selection of at least a first and a second minimum power reference,'}, [{'sub': 'FC', 'wherein the first maximum power reference is a summation of a pre-event electrical power output and a power amount proportionally to the grid frequency deviation (ΔP), and'}, {'sub': 'FC', 'wherein the second maximum power reference is a summation of a ...

WIND-POWER-PLANT CONTROL UPON LOW-VOLTAGE GRID FAULTS

A wind power plant connected to an electric grid. A central plant controller is configured to carry out a method of controlling an electric output of the wind power plant in the event of a transient low-voltage fault of the electric grid. The central plant controller is configured, after a fault stage in response to detection of a low-voltage fault during which the wind turbines ride through the grid fault, to control the wind power plant during a post-fault-support stage to provide only real power, or perform voltage control. The central plant controller is configured to resume control of the wind power plant according to the nominal-grid operation mode, which prevailed before the low-voltage fault, in a nominal-grid operation stage. 1. A wind power plant connected to an electric grid with a nominal voltage , comprising a central plant controller and wind turbines ,wherein the central plant controller is configured to carry out an operation of controlling an electric output of the wind power plant in the event of a grid fault, being a transient low-voltage fault of the electric grid,wherein the wind turbines are configured to operate in a nominal-grid operation mode during which the grid voltage is within a nominal grid operation range and the wind turbines are controlled according to at least one reference value of an electric-production parameter provided by the central plant controller,wherein the wind turbines operate during a fault stage, during which the grid voltage falls below the nominal grid operation range, so as to ride through the grid fault,and wherein during a post-fault-support stage which is entered when the grid fault has cleared such that the grid voltage returns to within the nominal grid operating range, the central plant controller is configured to control the wind power plant to provide only real power, or to perform voltage control,and wherein the central plant controller is configured to resume, after the post-fault support stage, control ...

POWER GENERATION SYSTEM

Electric power obtained by wind power generation is used effectively. A power generation system in an embodiment includes: a wind power generation apparatus; a solar thermal power generation apparatus; and an electrothermal converting unit. The solar thermal power generation apparatus includes: a heater heating a heating medium by solar heat; and a heat exchanger exchanging heat of the heating medium heated by the heater and heat of a working fluid to operate a drive mechanism of a power generator. The electrothermal converting unit converts part of electric power generated by the wind power generation apparatus into heat to heat the heating medium. 1. A power generation system , comprising:a wind power generation apparatus;a solar thermal power generation apparatus including: a heater heating a heating medium by solar heat; and a heat exchanger exchanging heat of the heating medium heated by the heater and heat of a working fluid to operate a drive mechanism of a power generator; andan electrothermal converting unit converting part of electric power generated by the wind power generation apparatus into heat to heat the heating medium.2. The power generation system according to claim 1 ,wherein the electrothermal converting unit converts a high-frequency component, of electric power generated by the wind power generation apparatus, higher than a predetermined frequency into heat to heat the heating medium.3. The power generation system according to claim 2 , an electric heater;', 'an electric power converting section converting supplied electric power to electric power to drive the electric heater; and', 'an electric power conversion control section controlling an operation of the electric power converting section so that the high-frequency component of electric power generated by the wind power generation apparatus may be converted into electric power to drive the electric heater and including a high-pass filter., 'wherein the electrothermal converting unit ...

System and method for optimizing wind turbine operation

System and methods for optimizing operation of a wind turbine are disclosed. In one aspect, the method also includes determining, via a converter controller of a power converter, a tap position of a tap changer configured between the power grid and a primary winding of a transformer. Another step includes calculating, via the converter controller, a primary voltage of the primary winding as a function of the tap position. The method also includes implementing, via the converter controller, a control action if the primary voltage or a measured secondary voltage of a secondary winding of the transformer is outside of a predetermined voltage range.

WIND TURBINE POWER CONVERSION SYSTEM

The invention refers to a multilevel topology power converter (I) for electrical adaption of a low voltage alternating current (LVAC) of an electrical wind power generator () and a medium voltage (MV) transmission level for a transmission link to each other, the power converter (I) comprising for each phase: 11. Multilevel topology power converter (I) for electrical adaption of a low voltage alternating current (LVAC) of an electrical wind power generator () and a medium voltage (MV) transmission level for a transmission link to each other , the power converter (I) comprising for each phase:{'b': 9', '9', '15, 'a switching unit () for adapting the low voltage (LV) and the medium voltage (MV) to each other, the switching unit () being controlled by a controller ().'}2. Multilevel topology power converter (I) according to characterized by{'b': 5', '1', '7', '9', '1', '7, 'comprising for each phase a current converter () for providing a direct current (DC) towards or from a plurality of n>1 capacitors C . . . Cn () electrically connected in series, whereby the controlled switching unit () switches n+1 terminal potentials along terminals of the series of the n>1 capacitors C . . . Cn ().'}3. Multilevel topology power converter (I) according to characterized by comprising for each phase:{'b': 5', '1, 'the current converter () for providing at two main terminals a low voltage direct current (LVDC) from or to the low voltage alternating current (LVAC) of the electrical power generator ();'}{'b': 1', '7, 'the plurality of n>1 capacitors C . . . Cn () electrically connected in series between the two main terminals of the low voltage direct current (LVDC);'}{'b': 9', '1', '7, 'the controlled switching unit () for separately switching n+1 terminal potentials along terminals of the series of the n>1 capacitors C . . . Cn () to provide a medium voltage alternating current (MVAC) for or from the transmission link.'}4. Multilevel topology power converter (I) according to ...

EDUCTION INDUSTRIAL POWER SYSTEM

An eduction industrial power system is provided. The system includes one or more vertical-axis wind turbine power plants. Wind is accelerated through a multi-floor eductor of the power plant. Each floor of the eductor is configured with a constricted portion designed to increase the air speed through the eductor, such that low speed winds enter the eductor and much higher speed winds exit it. A plurality of rotor-blade assemblies disposed in the constricted portion of each floor of the multi-floor eductor are mounted to, and rotate, a shared vertical-axis rotor shaft to generate electricity, via a generator. The electricity generated can be stored, used or channeled to an electrical grid, as desired. 1. A power plant , comprisinga power plant house defined by an upper bearing house, an eductor house below the upper bearing house and a lower bearing house below the eductor house;a multi-floor eductor integrated with said power plant house, and extending from and beyond said power plant house, the multi-floor eductor including a wide wind intake distal from said power plant house and a narrower wind outlet disposed through a face of said power plant house distal from said wind intake, a constricted neck portion contained in said eductor house, each space between two adjacent floors of said multi-floor eductor defining a wind channel;a plurality of rotor-blade assemblies supported in said constricted neck portion of said multi-floor eductor between said wind intake and said wind outlet on the same, single, vertical-axis main rotor shaft, with each rotor-blade assembly of said plurality separated vertically from at least one other rotor-blade assembly by a floor of said multi-floor eductor;anda generator vertically aligned with and directly connected to the vertical-axis main rotor shaft for generating power when said single main rotor shaft rotates.2. The power plant of claim 1 , wherein said wind intake of said multi-floor eductor structure has a greater fluid flow ...

WIND-ENERGY CONVERSION SYSTEMS WITH AIR CLEANERS

A wind-energy conversion system includes a wind-delivery system configured to accelerate wind, an energy extractor configured to output energy in response to receiving the accelerated wind from the wind-delivery system, and an air cleaner configured to clean the wind, e.g., so that cleaned wind exits the wind-energy conversion system. 1. A wind-energy conversion system , comprising:a wind-delivery system configured to accelerate wind;an energy extractor configured to output energy in response to receiving the accelerated wind from the wind-delivery system; andan air cleaner configured to clean the wind.2. The wind-energy conversion system of claim 1 , wherein the wind-energy conversion system is configured to adjust a size and/or shape of the wind-delivery system based on at least one of a prevailing wind speed external to the wind-energy conversion system claim 1 , a flow velocity within the wind-energy conversion system claim 1 , and a power output by the wind-energy conversion system.3. The wind-energy conversion system of claim 1 , wherein the air cleaner comprises at least one of a mechanical filter and an electrical filter.4. The wind-energy conversion system of claim 3 , wherein the mechanical filter comprises at least one of a HEPA filter and a carbon filter.5. The wind-energy conversion system of claim 3 , wherein the electrical filter comprises at least one of an electrostatic filter and an electronic filter.6. The wind-energy conversion system of claim 1 , further comprising an air-cleaning system claim 1 , comprising the air cleaner claim 1 , wherein the air-cleaning system is configured to direct the wind to the air cleaner when the air-cleaning system is activated and to cause the wind to bypass the air cleaner when the air-cleaning system is deactivated.7. The wind-energy conversion system of claim 6 , wherein the air-cleaning system is configured to be activated or deactivated in response to a signal from a controller of the wind-energy conversion ...

WIND TURBINE AUXILIARY CIRCUIT CONTROL

Systems and methods for controlling operation of one or more auxiliary circuits in a wind turbine system are provided. For instance, a grid event associated with the wind turbine system can be detected. In response to the grid event, a control signal can be provided to an auxiliary circuit breaker of the wind turbine system. The auxiliary circuit breaker can be associated with one or more auxiliary circuits that are not directly in a power production path of the wind turbine system. The auxiliary circuit breaker can disconnect the one or more auxiliary circuits from the grid based at least in part on the control signal. 1. A control method of controlling operation of one or more auxiliary circuits in a wind turbine system , the method comprising:detecting a grid event associated with a wind turbine system;in response to detecting the grid event, providing a control signal to an auxiliary circuit breaker, the auxiliary circuit breaker being associated with one or more auxiliary circuits that are not directly in a power production path of the wind turbine system;disconnecting, by the auxiliary circuit breaker, the one or more auxiliary circuits from the grid based at least in part on the control signal.2. The control method of claim 1 , wherein disconnecting claim 1 , by the auxiliary circuit breaker claim 1 , the one or more auxiliary circuits from the grid based at least in part on the control signal comprises disconnecting the one or more auxiliary circuits from the grid independently from an amount of load current flowing between the auxiliary circuit breaker main contacts.3. The control method of claim 1 , wherein the control signal is provided to the auxiliary circuit breaker via a shunt trip device coupled to the auxiliary circuit breaker.4. The control method of claim 1 , wherein the grid event corresponds to a high voltage event claim 1 , a low voltage event claim 1 , a zero voltage event claim 1 , a frequency shift claim 1 , a phase shift claim 1 , or an ...

Rotary Device, for Instance an Air Mover Such as a Fan, a Propeller or a Lifting Rotor, a Water Turbine or a Wind Turbine

A rotary device comprises a frame with a guide for flowing medium, a rotor with a number of blades, whereby a relation is obtained between the flowing medium and the rotation of the rotor, and energy converting means, the one part of which is connected to the frame and the other part to the rotor. The device has the feature that the end zones of the blades are connected to a ring, the ring has a radial section with the shape of an isosceles triangle or trapezium, the medium guide has an encircling recess, the form of which corresponds to the form of the ring and the ring fits with clearance into the recess, permanent magnets are added to the truncated conical surfaces, electromagnets debouch on both the corresponding surfaces of the recess, this such that the ring and the frame together form an annular induction motor or an electric generator. 1. Rotary device for converting one form of energy to another form of energy , which forms of energy are electrical energy and the energy of a flowing medium , the device comprising:a frame with an inlet and an outlet and a rotation-symmetrical guide for the flowing medium extending between the inlet and the outlet;a rotor supported rotatably at least during operation by said frame and having a central hub and a number of blades which are connected to said hub in angularly equidistant arrangement and which extend at least more or less in radial direction, which blades all have a form such that a relation between the flowing medium and the rotation of the rotor is obtained; andenergy converting means, the one part of which is connected fixedly to the frame and the other part is connected fixedly to the rotor;characterized in thatthe rotor comprises a concentric ring to which the end zones of the blades are connected;the ring has two equal truncated conical surfaces with mutually opposite orientations, has for instance a radial section with at least partially the general shape of an isosceles triangle or trapezium, the base of ...

METHOD OF OPERATING A WIND TURBINE AS WELL AS A SYSTEM SUITABLE THEREOF

A method of operating a wind turbine is provided. The wind turbine comprises a turbine rotor with at least one blade having a variable pitch angle, a power generator, and a power converter connected to the power generator via a first circuit breaker and to a power grid via a second circuit breaker. According to the method, overvoltage events at the power grid are monitored. If an overvoltage event is detected, the method comprises opening the first circuit breaker and the second circuit breaker, disabling active operation of the power converter, connecting a power dissipating unit to the power generator to dissipate power output from the power generator, and moving the pitch angle of the at least one blade towards a feathered position. 1. A method of operating a wind turbine comprising a turbine rotor with at least one blade having a variable pitch angle , a power generator , and a power converter connected to the power generator via a first circuit breaker and to a power grid via a second circuit breaker , the method comprising:monitoring the power grid for overvoltage events; and opening the first circuit breaker and the second circuit breaker;', 'disabling active operation of the power converter;', 'connecting a power dissipating unit to the power generator to dissipate power output from the power generator; and', 'moving the pitch angle of the at least one blade towards a feathered position., 'if an overvoltage event is detected2. The method according to claim 1 , further comprising:determining whether the pitch angle of the at least one blade has reached a predefined position; and closing the first circuit breaker and the second circuit breaker;', 'disconnecting the power dissipating unit from the power generator; and', 'enabling active operation of the power converter., 'if the pitch angle of the at least one blade has reached the predefined position3. The method according to claim 2 , further comprising ramping up the power output of the power generator.4. ...

HORIZONTAL AXIS WIND TURBINE AND SECONDARY WIND ROTOR

A wind turbine () is disclosed, for converting wind energy into electric energy, comprising:—a shuttle () comprising a head portion () and a tail portion ();—a primary wind rotor () pivotable with respect to the shuttle () around a primary rotational axis (A) and comprising a primary group of blades (), a fastening hub () for said blades () projecting from the head portion () of the shuttle () and a shaft adapted for being rotatably moved by the primary wind rotor ();—at least one primary electric generator comprising at least one primary electric stator integral with the shuttle () and a primary electric rotor integral with said shaft or operatively connected to it, the primary electric generator adapted to convert wind energy intercepted by said primary group of blades () into electric energy. The wind turbine () also comprises a secondary wind rotor () pivotably hinged to the tail portion () and comprising a secondary group of blades () pivotable around a secondary rotation axis (A) perpendicular to the primary rotational axis (A). 1. Wind turbine for converting wind energy into electric energy , comprising:a shuttle comprising a head portion and a tail portion;a primary wind rotor pivotable with respect to the shuttle around a primary rotational axis and comprising a primary group of blades, a fastening hub for said blades projecting from the head portion of the shuttle and a shaft adapted for being rotatably moved by the primary wind rotor;at least one primary electric generator comprising at least a primary electric stator stably fixed to the shuttle and a primary electric rotor stably fixed to said shaft or operatively connected to said shaft, the primary electric generator being adapted to convert wind energy intercepted by said primary group of blades into electric energy;characterized in thatthe wind turbine further comprises a secondary wind rotor pivotably hinged to the tail portion and comprising a secondary group of blades pivotable around a secondary ...

Integrated Tether and Mooring with Floating Platform for Energy Kite

Offshore airborne wind turbine systems with an aerial vehicle connected to an undersea anchor via a tether are disclosed. A floating landing platform may be coupled to the tether and be dragged along the surface of the water along with the tether. The landing platform may be designed such that the tether can freely pass through the platform, allowing the aerial vehicle to ascend, descend, move laterally, and in crosswind flight, without creating a significant tension load on landing platform. The landing platform may also include a tether drive mechanism that can actively move the tether through the platform, thus changing the platform's location along the length of the tether. 1. An offshore airborne wind turbine system , comprising:an aerial vehicle;an underwater anchor; an insulated electrical conductor,', 'an upper portion secured to the aerial vehicle, and', 'a lower portion secured to the underwater anchor; and, 'a tether comprisinga floating platform configured as a landing platform for the aerial vehicle, wherein the tether passes through the floating platform along a reference axis and is captured by the floating platform such that the tether is constrained in movement relative to the floating platform in a plane perpendicular to the reference axis and the tether can freely move through the floating platform along the reference axis.2. The system of claim 1 , wherein the aerial vehicle claim 1 , tether claim 1 , anchor claim 1 , and floating platform are arranged such that a pulling force of the aerial vehicle causes a tension load to extend through the tether between the aerial vehicle and the underwater anchor.3. The system of claim 1 , wherein the tether is constrained in movement relative to the floating platform such that lateral movement of the aerial vehicle during flight causes a corresponding lateral force from the tether against the floating platform.4. The system of claim 1 , wherein the underwater anchor is positioned at a seabed.5. The system ...

SYSTEM AND METHOD FOR CONTROLLING A WIND TURBINE SYSTEM

A method for controlling a wind turbine system may generally include controlling a wind turbine to operate at a speed and torque setting within a permissible operating region defined between maximum and minimum operating curves, receiving a speed de-rate request and/or a torque de-rate request to de-rate the wind turbine based on a limiting constraint of the wind turbine system, determining an adjusted speed setting and/or an adjusted torque setting for the wind turbine based on the speed de-rate request and/or the torque de-rate request, determining whether an adjustment of the wind turbine operation to the adjusted speed setting and/or the adjusted torque setting would place the turbine outside the permissible operating region and, if the adjustment would place the operation outside the permissible operating region, adjusting the speed setting and/or the torque setting to a new speed and/or torque setting defined along the maximum or minimum operating curve. 1. A method for controlling a wind turbine system , the method comprising:controlling a wind turbine of the wind turbine system to operate at a speed setting and a torque setting within a permissible operating region defined between a maximum operating curve and a minimum operating curve for the wind turbine;receiving at least one of a speed de-rate request or a torque de-rate request to de-rate the wind turbine based on a limiting constraint of the wind turbine system;determining at least one of an adjusted speed setting or an adjusted torque setting for the wind turbine based on the at least one of the speed de-rate request or the torque de-rate request;determining whether an adjustment of the wind turbine operation to the at least one of the adjusted speed setting or the adjusted torque setting would place the wind turbine operation outside the permissible operating region; andif the adjustment would place the wind turbine operation outside the permissible operating region, adjusting the at least one of the ...

METHOD FOR CONTROLLING INERTIA RESPONSE OF VARIABLE-SPEED WIND TURBINE GENERATOR

A method of controlling inertia response of variable-speed wind turbine generator includes following steps. A maximum wind power of the wind turbine is gotten through a wind speed νand a rotation speed ωat the hub of the wind turbine based on a maximum wind power tracking control strategy. The maximum wind power is set as an active power control reference value Pof the wind turbine. A grid frequency f is obtained via a frequency measurement equipment. An additional active power control reference value ΔP of the wind turbine is generated based on the grid frequency f via an additional control block, and the additional active power control reference value ΔP is added on the active power control reference value P, wherein a total of active power control reference value of the wind turbine is P+ΔP. 1. A method of controlling inertia response of variable-speed wind turbine generator , the method comprising:{'sub': w', 'r, 'getting a maximum wind power of the wind turbine through a wind speed νand a rotation speed ωat the hub of the wind turbine based on a maximum wind power tracking control strategy;'}{'sub': '0', 'setting the maximum wind power as an active power control reference value Pof the wind turbine;'}obtaining a grid frequency f via an frequency measurement equipment; and{'sub': 0', '0, 'generating an additional active power control reference value ΔP of the wind turbine based on the grid frequency f via an additional control block, and adding the additional active power control reference value ΔP on the active power control reference value P, wherein a total of active power control reference value of the wind turbine is P+ΔP.'}2. The method of claim 1 , wherein the additional control block adopts a relay style control strategy comprising:while a changing magnitude Δf of the grid frequency f is greater than a predetermined threshold value, the additional control block is activated;while the changing magnitude Δf of the grid frequency f is within a range of the ...

POWER TRANSFER AND GENERATION USING PRESSURIZED FLUIDS

The invention captures harvestable mechanical energy, e.g., in the form of wind or moving water, and uses it for electrical generation or other work. In various embodiments a turbine is used to pressurize a fluid, and the pressurized fluid is then optionally stored and then used to drive an electric generator. Because the pressurized fluid can be stored in a pressurized state indefinitely, the invention provides a straightforward way to accumulate the mechanical energy until it is needed. Additionally, the invention allows portions of the system, e.g., a pressure vessel or generator, to be located away from the turbine, reducing the costs of deploying and maintaining the system. 1. An electrical generation system comprising:a wind turbine comprising a rotating shaft;a fluidic pump mechanically coupled to the rotating shaft;a pressure vessel;a fluidicly-powered electric generator;a first valve fluidicly coupled between the fluidic pump and the pressure vessel; anda second valve fluidicly coupled between the pressure vessel and the fluidicly-powered electric generator,wherein rotational motion from the wind turbine causes the fluidic pump to pressurize a fluid, and the pressurized fluid moves through the pressure vessel and energizes the fluidicly-powered electric generator, thereby generating electricity.2. The system of claim 1 , wherein the rotating shaft is oriented horizontally and the turbine comprises at least two blades.3. The system of claim 1 , wherein the rotating shaft is oriented vertically and the turbine comprises at least two vanes.4. The system of claim 1 , wherein the first valve is actuated at a first fluidic pressure.5. The system of claim 1 , wherein the second valve is actuated at a second fluidic pressure.6. The system of claim 1 , wherein the fluidic pump is a pneumatic pump.7. The system of claim 6 , wherein the pneumatic pump is selected from a rotary vane compressor claim 6 , a scroll compressor claim 6 , and a piston compressor.8. The ...

Generator-Fault-Tolerant Control for a Variable-Speed Variable-Pitch Wind Turbine

A fault-tolerant control system and method for variable-speed variable-pitch wind turbines with an inverter-fed generator. When generator faults are detected, the generator torque and/or flux is limited to prevent propagation of the faults and possible failure and shutdown of the generator. The control system and method improves on two-loop control methods for variable-speed variable-pitch wind turbines and provides improved power delivery under fault conditions. 1. A method for fault-tolerant control of a wind turbine including a generator and a generator monitoring subsystem which continuously senses the condition of the generator and provides to the fault-tolerant control system fault management parameters , either as reduced time derivative of stator flux linkage in a faulty stator phase wherein the magnitude of the rotating magnetic flux and/or the magnitude of the torque building current is manipulated in such a way that time derivative of stator flux linkage is kept below the given reduced value at the fault location , or as fault localizing angles θ , θand the maximum allowed torque Tat the fault location on the generator magnetic flux circumference wherein said method reduces magnitude Tof the generator torque locally around the fault location such that the fault does not further progress and the energy production is deteriorated as less as possible , said method comprising the following steps:if no generator fault condition is detected, operating said wind turbine in a normal state; and [{'sub': g', 'gref', '1', '2', 'gf, '(1) acquisition of the momentary angular velocity of the generator ωand the associated required generator torque T′and providing fault management parameters θ, θ, Tcorresponding to said detected fault;'}, {'sub': g', {'sub2': '—'}, 'nonf, '(2) control system decides what is the higher value of the torque Tnecessary to maintain unchanged average torque and angular velocity of the generator;'}, {'sub': g', {'sub2': '—'}, 'nonf', 'gn', 'on ...

METHOD FOR OPERATING A WIND TURBINE

A method of operating a wind power installation is disclosed. In the method, a network frequency of an electrical network is measured and an amount of power delivered to the electrical network is controlled by at least maintaining the amount of power delivered without changing the power when the network frequency is between a rated frequency for the electrical network and a deadband frequency. Further, the amount of power is increased by a first amount when the network frequency is between the deadband frequency and a control-band frequency, whereby the first amount is proportional to a difference between the network frequency and the deadband frequency. In addition, the amount of power delivered is increased by a second amount when the network frequency is less than the control-band frequency. The second amount is a preset amount of power that is determined based on a difference between the control-band and deadband frequencies. 1. A method of operating a wind power installation , the method comprising:measuring a network frequency of an electrical supply network; and maintaining the amount of power delivered by the generator without changing the power when the network frequency is between a rated frequency for the electrical supply network and a deadband frequency;', 'increasing the amount of power delivered by the generator by a first amount when the network frequency is between the deadband frequency and a control-band frequency, wherein the first amount is proportional to a difference between the network frequency and the deadband frequency; and', 'increasing the amount of power delivered by the generator by a second amount when the network frequency is less than the control-band frequency, wherein the second amount is a preset amount of power and is determined based on a difference between the control-band frequency and the deadband frequency., 'controlling an amount of power delivered by a generator of the wind power installation to the electrical supply ...

SHORT-TERM OPERATION OPTIMIZATION METHOD OF ELECTRIC POWER SYSTEM INCLUDING LARGE-SCALE WIND POWER

The present invention discloses a short-term operation optimization method for a power system including large-scale wind power, comprising modeling the randomness of wind power output, modeling the randomness of the load of electric power system and modeling net load of electric power system. Net load refers that for probability distribution of net load that is too discretized, probability distribution curve of net load is divided into N intervals, the probabilities for each interval are obtained and probability distribution curve of net load is obtained through calculating and weighing each interval. Through calculating randomness of power wind output and standard deviation of load prediction error of the electric power system, net load prediction error of the electric power system is obtained and reasonable coordination is made on the electric power system according to prediction error and prediction amount to better regulate the correlations between randomness, volatility, regionalism, double-circuit peak shaving and load of wind power generation, so as to realize optimization operation of the electric power system. 1. A short-term operation optimization method of an electric power system including large-scale wind power characterized in that , the method comprising the following steps:{'sub': wt', 'w', 't', '0', 'wt', 't', 'w', '0, 'modelling randomness of wind power output: as prediction error value of wind power output follows a zero-mean normal distribution, relation between standard deviation of prediction error of wind power output is expressed as σ=k×ŵ+k, wherein, σis predicted standard deviation of wind power; ŵis predicted value of wind power; kand krefer to prediction error constant;'}{'sub': t', 't', 'wt', 'wt, 'calculating the wind power output according to the above predicted standard deviation of wind power, which is expressed as w=ŵ+θ, wherein, θis random variable of prediction error of wind power;'}{'sub': dt', 'd', 't', 'dt', 't', 'd, 'modeling ...

METHOD FOR CONTROLLING WIND TURBINES

A method for feeding electrical energy into an electrical supply grid by means of a wind turbine or wind farm, where the wind turbine or wind farm converts kinetic energy from wind with variable speed to electrical energy, a wind speed is predicted based on a wind forecast and a reactive power to be fed in is calculated as predicted reactive power based on the predicted wind speed. 1. A method for feeding electrical energy into an electrical supply grid by a wind turbine or wind farm , the method comprising:using the wind turbine or wind farm, converting kinetic energy from wind with variable wind speed to electrical energy,predicting a wind speed based on a wind forecast, andcalculating a predicted reactive power to be fed in based on the predicted wind speed.2. The method according to claim 1 , further comprising transmitting the predicted reactive power as a forecast value to a grid control center that controls the electrical supply grid.3. The method according to claim 1 , further comprising:calculating an active power to be fed in as the predicted active power based on the predicted wind speed, andwherein the predicted reactive power is greater than the predicted active power when a wind speed was predicted to be greater than a mean storm wind speed lying between a first wind speed of a storm and a second wind speed of a storm, whereinthe first wind speed of a storm is a wind speed from which the active power is reduced when the wind speed keeps increasing, andthe second wind speed of a storm is a wind speed at which active power is no longer fed into the supply grid.4. The method according to claim 1 , wherein:the predicted reactive power is predicted for a forecast period, andthe wind turbine or wind farm feeds in the predicted reactive power at a point in the forecast period later than calculated.5. The method according to claim 3 , wherein the predicted reactive power is calculated as a forecast value and transmitted as such to the grid control center only ...

WIND, SOLAR, AND MAGNETIC ELECTRICAL GENERATION SYSTEM

The invention provides a system, apparatus and method for generating continuous electricity from a variety of sources, using high torque, high efficiency motors, and optionally a wind turbine to operate at least one generator.

Systems and Apparatus for Cable Management

Wind energy systems, such as an Airborne Wind Turbine (“AWT”), may be used to facilitate conversion of kinetic energy to electrical energy. An AWT may include an aerial vehicle that flies in a path to convert kinetic wind energy to electrical energy. The aerial vehicle may be tethered to a ground station via a tether. As a result of continuous circular flights paths, the tether may rotate continuously in one direction. Thus, it may be desirable to have a cable management apparatus that allows for tether rotation and helps reduce strain on the tether. 1. A cable management apparatus , comprising: a tether gimbal assembly attached to the drum and rotatable about at least one axis;', a first end coupled to the tether gimbal assembly; and', 'a second end;, 'a flexible coupling comprising, a stationary slip ring portion configured to remain substantially stationary relative to rotation of the drum about the axis of the drum, wherein the stationary slip ring portion includes at least one insulated electrical conductor;', 'a rotatable slip ring portion configured to rotate relative to the stationary slip ring portion, wherein the rotatable slip ring portion includes at least one insulated electrical conductor, and wherein the rotatable slip ring portion is coupled to the second end of the flexible coupling; and', 'at least one insulated electrically conductive pathway between the at least one insulated electrical conductor of the stationary slip ring portion and at least one insulated electrical conductor of the rotatable slip ring portion., 'a slip ring, comprising, at least one insulated electrical conductor;', 'a distal tether end outside of the drum, configured to electrically couple the at least one insulated electrical conductor of the tether to an external electrical device;', 'a main tether body extending through the tether gimbal assembly and through the flexible coupling; and', 'a proximate tether end, wherein the at least one insulated electrical conductor of ...

OPTIMIZED FILTER FOR BATTERY ENERGY STORAGE ON ALTERNATE ENERGY SYSTEMS

A system for operating a power generation system within a battery storage/discharge mode includes a power convertor having a DC link, a switching module coupled to the DC link, a storage device, and a filter coupled between the storage device and power converter. The filter may correspond to a normal mode filter configured to limit normal mode voltage from being applied to the storage device. A common mode filter may be associated with the storage device. The storage device may correspond to one or more batteries while the power generation system may correspond to a wind-driven generator. 1. A system for operating a power generation system within an energy storage/discharge mode , the system comprising:a power convertor including a DC link;a switching module coupled to said DC link;an energy storage device; anda filter coupled between said switching module and said energy storage device,wherein said filter comprises a normal mode filter having a series coupled inductor and capacitor corresponding to an inductor leg and a capacitor leg, andwherein said inductor leg is coupled to said power converter and said capacitor leg is coupled to said DC link.2. The system of claim 1 , wherein said switching module is configured as a bi-directional DC-to-DC converter for controlling the flow of power to and from said energy storage device.3. The system of claim 1 , wherein said energy storage device comprises at least one battery.4. The system of claim 1 , wherein said energy storage device comprises a plurality of batteries.5. The system of claim 4 , wherein said plurality of batteries are coupled in parallel.6. The system of claim 1 , further comprising a second filter associated with said energy storage device.7. The system of claim 6 , wherein said second filter comprises a common mode filter.8. The system of claim 7 , wherein said common mode filter comprises an inductive device coupled in parallel with said capacitor leg of said normal mode filter.9. The system of claim 1 ...

WIND POWER GENERATION CONTROL DEVICE AND WIND POWER GENERATION SYSTEM HAVING THE SAME

The present disclosure discloses a wind power generation control device and a wind power generation system, the wind power generation control device is coupled between a wind power generator and a power grid, including: a converter unit including a generator-side converter, a DC bus capacitor and a grid-side converter, an AC-side of the generator-side converter is coupled to a rotor-side of the wind power generator, a DC-side of the generator-side converter is coupled to the DC bus capacitor, a DC-side of the grid-side converter is coupled to the DC bus capacitor, and an AC-side of the grid-side converter is coupled to the power grid; and a switching unit for switching the wind power generation control device between the doubly-fed power generation operating mode and the full-power operating mode according to a wind speed. 1. A device for controlling a wind power generator , the device being coupled between a wind power generator and a power grid , comprising:a converter unit comprising a generator-side converter, a DC bus capacitor and a grid-side converter, wherein an AC-side of the generator-side converter is coupled to a rotor-side of the wind power generator, a DC-side of the generator-side converter is coupled to the DC bus capacitor, a DC-side of the grid-side converter is coupled to the DC bus capacitor, and an AC-side of the grid-side converter is coupled to the power grid; anda switching unit for switching the operation mode of the device between a doubly-fed generation mode and a full-power mode according to a wind speed.2. The device according to claim 1 , the switching unit comprising a first switch and a second switch claim 1 , whereina first end of the first switch is coupled to a stator-side of the wind power generator and a first end of the second switch, a second end of the first switch is shorten;the first end of the second switch is coupled to the stator-side of the wind power generator, and a second end of the second switch is coupled to the ...

High Frequency Bi-directional AC Power Transmission

A method may involve transmitting power between a tethered aerial vehicle equipped with wind turbines for generating power and a ground station configured to interconnect the generated power to an electrical distribution network. The power may be transmitted using high voltage, high frequency AC electrical signals, and transformers at the ground station and the aerial vehicle can scale the AC voltage for use at the respective locations. Converters at the ground station and the aerial vehicle can then convert the transformed voltage to DC. The AC voltage may be transmitted through the tether at a resonant frequency of the tether based in part on an internal capacitance between multiple conductive paths on the tether. 1. A system comprising:an aerial vehicle comprising: a propeller, a motor-generator mechanically coupled to the propeller, a DC bus electrically coupled to the motor-generator, a transformer, and a converter electrically coupled to the transformer, wherein the motor-generator is configured to alternately: (i) use energy from the DC bus to move the propeller and thereby generate thrust on the aerial vehicle, and (ii) generate electrical energy from movement of the propeller and, using the generated electrical energy, supply the DC bus;a tether coupled to the aerial vehicle, wherein the tether comprises a first conductive path and a second conductive path configured to transmit an AC voltage by the first conductive path conducting a periodically varying voltage with respect to a voltage on the second conductive path; anda ground station coupled to the aerial vehicle via the tether, wherein the ground station and the DC bus in the aerial vehicle are configured to transmit power between one another via the tether,wherein the tether has an internal tether capacitance between the first conductive path and the second conductive path,wherein the transformer is configured to transform between the AC voltage transmitted through the tether and a reduced AC voltage, ...

POWER CONVERSION SYSTEM FOR A MULTI-STAGE GENERATOR

An electric power generation system is provided, including a generator having a plurality of stages engaged by a prime mover; and a plurality of branches for connecting the stages to an electrical load, each of the branches having a switch for connecting or disconnecting the branch to the stages. Power from a prime mover, such as a turbine, is sent by a controller to one or more of the branches as appropriate to handle the power level generated. 115.-. (canceled)16. A method of connecting a power generator comprising a plurality of stages to an electrical load , each of said stages connected to said load via a corresponding branch having a converter and a parallel series selector , each of said converters having the same power range , comprising:(a) determining a power output of said generator;(b) configuring at least one of said parallel series selector for said power output;(c) selecting one or more of said branches corresponding to said configured parallel series selectors; and(d) passing said power output to said electrical load along said selected branches.17. The method of claim 16 , wherein said branches further comprise a transformer.18. The method of wherein said selected branch is selected using a switch.19. The method of wherein said electrical load is an electric grid.2022.-. (canceled)23. An electric power generation system claim 18 , comprising:a prime mover;a multi-stage generator having a plurality of machine configurations each selectively engageable by said prime mover to generate electrical power; anda power conversion system that in use delivers electrical power from said multi-stage generator to an electrical load, said power conversion system having a plurality of branches for connecting said multi-stage generator to said electrical load, each of said plurality of branches comprising a converter, wherein each of the said converters has a respective power range, the respective power range of at least one of said converters different from the ...