Wind turbine providing grid support

A variable speed wind turbine is arranged to provide additional electrical power to counteract non-periodic disturbances in an electrical grid. A controller monitors events indicating a need to increase the electrical output power from the wind turbine to the electrical grid. The controller is arranged to control the wind turbine as follows: after an indicating event has been detected, the wind turbine enters an overproduction period in which the electrical output power is increased, wherein the additional electrical output power is taken from kinetic energy stored in the rotor and without changing the operation of the wind turbine to a more efficient working point. When the rotational speed of the rotor reaches a minimum value, the wind turbine enters a recovery period to re-accelerate the rotor to the nominal rotational speed while further contributing to the stability of the electrical grid by outputting at least a predetermined minimum electrical power.

WIND TURBINE PROVIDING GRID SUPPORT

A variable speed wind turbine is arranged to provide additional electrical power to counteract non-periodic disturbances in an electrical grid. A controller monitors events indicating a need to increase the electrical output power from the wind turbine to the electrical grid. The controller is arranged to control the wind turbine as follows: after an indicating event has been detected, the wind turbine enters an overproduction period in which the electrical output power is increased, wherein the additional electrical output power is taken from kinetic energy stored in the rotor and without changing the operation of the wind turbine to a more efficient working point. When the rotational speed of the rotor reaches a minimum value, the wind turbine enters a recovery period to re-accelerate the rotor to the nominal rotational speed while further contributing to the stability of the electrical grid by outputting at least a predetermined minimum electrical power. 1. A wind turbine for connection to an electrical grid , the wind turbine comprising:a rotor with blades coupled to an electrical generator; and increase, in response to an event, an electrical output power from the wind turbine for a duration of an overproduction period using kinetic energy stored in the rotor thereby decreasing a rotational speed of the rotor, and', 'after increasing the electrical output power and before the rotational speed of the rotor reaches a predetermined minimum value, accelerate the rotor for a duration of a recovery period to a previous rotational speed while outputting at least a predetermined minimum electrical power to the electrical grid., 'a controller configured to2. The wind turbine according to claim 1 , wherein the controller is configured to control the wind turbine such that the predetermined minimum electrical power output to the electrical grid during the recovery period is based on an electrical operating power which was supplied to the electrical grid during a normal ...

SYSTEMS AND METHODS FOR GENERATING AN INERTIAL RESPONSE TO A CHANGE IN THE VOLTAGE OF AN ELECTRICIAL GRID

Systems, methods, and computer program products for providing an inertial response by a wind power system to power fluctuations in an electrical grid. The system includes a synthetic inertial response generator configured to generate a power offset in response to fluctuations in grid voltage. The power offset signal is generated by determining a quadrature component the grid voltage using an internal reference voltage having an angular frequency and phase angle that is synchronized to the electrical grid by a control loop. The quadrature component is used to determine a synchronous power level. A control loop error signal is produced by the difference between the synchronous power level and the wind turbine system power output. Changes in the grid frequency produce an error signal that is added to the power set point of wind turbine system output controllers to provide a power system inertial power output response.

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.

Wind turbine providing grid support

A variable speed wind turbine is arranged to provide additional electrical power to counteract non-periodic disturbances in an electrical grid. A controller monitors events indicating a need to increase the electrical output power from the wind turbine to the electrical grid. The controller is arranged to control the wind turbine as follows: after an indicating event has been detected, the wind turbine enters an overproduction period in which the electrical output power is increased, wherein the additional electrical output power is taken from kinetic energy stored in the rotor and without changing the operation of the wind turbine to a more efficient working point. When the rotational speed of the rotor reaches a minimum value, the wind turbine enters a recovery period to re-accelerate the rotor to the nominal rotational speed while further contributing to the stability of the electrical grid by outputting at least a predetermined minimum electrical power.

Constant torque control of a wind turbine using an energy storage system

A method for controlling a wind turbine is disclosed. During full load operation, a power reference value, Pref, representing a power level to be supplied to the power grid by the wind turbine, is received, and the wind turbine is controlled in order to produce an output power which is at or near the power reference value, Pref, while maintaining a constant torque on the generator. In the case that the produced output power of the wind turbine exceeds the power reference value, Pref, excess produced energy is stored in the energy storage system, and in the case that the produced output power of the wind turbine is below the power reference value, Pref, stored energy is retrieved from the energy storage system. A power level being equal to the power reference value, Pref, is supplied to the power grid.

Method for detecting power oscillation in an electric power grid

A method for detecting power oscillation in an electric power grid, wherein the method comprises: integrating a filtered signal on a first interval, the filtered signal being associated with the electric power grid; based on the integration of the filtered signal on the first interval, determining a positive half-period area of the filtered signal and a negative half-period area of the filtered signal, one of the positive half-period area and negative half-period area being immediately subsequent to the other one; and determining that a power oscillation in the electric power grid is detected if the following two conditions are met:a sum of the positive half-period area of the filtered signal and the negative half-period area of the filtered signal is below a first threshold; andthe absolute value of one of the positive half-period area and negative half-period area is above a second threshold.

Systems and methods for generating an inertial response to a change in the voltage of an electrical grid

Systems, methods, and computer program products for providing an inertial response by a wind power system to power fluctuations in an electrical grid. The system includes a synthetic inertial response generator configured to generate a power offset in response to fluctuations in grid voltage. The power offset signal is generated by determining a quadrature component the grid voltage using an internal reference voltage having an angular frequency and phase angle that is synchronized to the electrical grid by a control loop. The quadrature component is used to determine a synchronous power level. A control loop error signal is produced by the difference between the synchronous power level and the wind turbine system power output. Changes in the grid frequency produce an error signal that is added to the power set point of wind turbine system output controllers to provide a power system inertial power output response.

METHOD FOR EMULATION OF SYNCHRONOUS MACHINE

The present invention relates to electric energy sources, such as a single wind power turbine or wind power plant, that are interfaced with the utility grid through power electronic converters. In particular, the present invention relates to specific techniques and methodologies for power electronic converters for stabilizing the utility grid during transient conditions and for providing similar stability mechanisms that are inherently present in electric synchronous generators while maintaining the possibility for fast and decoupled following of set points for generated active and/or reactive powers.

WIND TURBINE PROVIDING GRID SUPPORT

A variable speed wind turbine is configured to provide additional electrical power to counteract non-periodic disturbances in an electrical grid. A controller monitors events indicating a need to increase the electrical output power from the wind turbine to the electrical grid. The controller is configured to control the wind turbine as follows: after an indicating event has been detected, the wind turbine enters an overproduction period in which the electrical output power is increased, wherein the additional electrical output power is taken from kinetic energy stored in the rotor and without changing the operation of the wind turbine to a more efficient working point. When the rotational speed of the rotor reaches a minimum value, the wind turbine enters a recovery period to re-accelerate the rotor to the nominal rotational speed while further contributing to the stability of the electrical grid by outputting at least a predetermined minimum electrical power.

Method for emulation of synchronous machine

The present invention relates to electric energy sources, such as a single wind power turbine or wind power plant, that are interfaced with the utility grid through power electronic converters. In particular, the present invention relates to specific techniques and methodologies for power electronic converters for stabilizing the utility grid during transient conditions and for providing similar stability mechanisms that are inherently present in electric synchronous generators while maintaining the possibility for fast and decoupled following of set points for generated active and/or reactive powers.

Power plant and energy storage system for provision of grid ancillary services

The present invention relates to method for operating a power plant, with at least one wind turbine generator arranged for supplying power to an electrical grid, at least one energy storage device arranged for supplying power to the electrical grid, and a power plant controller, the method comprises, measuring repetitively measurement sets of at least one electrical parameter from the electrical grid, and calculating, in respect the measurement sets of the at least one electrical parameter, a change in active and/or a required change in reactive power at a point of common coupling, and calculating and dispatching of a first control reference signal to the at least one wind turbine generator and a second control reference signal to the at least one energy storage device, for providing ancillary service functionalities to the electrical grid. The invention also relates to a power plant with at least one wind turbine generator for supplying power to an electrical grid, at least one energy storage device for supplying power to the electrical grid, and a power plant controller for providing ancillary service functionalities to the electrical grid.

Method for controlling a power plant

The present invention relates to a method for operating a power plant comprising a plurality of power producing units, the power plant being operatively connected to an associated power grid having a nominal grid frequency, the method comprising the steps of determining grid frequency variations of the associated power grid, and providing, in response to the determined grid frequency variations, an active power set-point to each of the plurality of power producing units, said active power set-point causing each of the plurality of power producing units to produce active power in response to said active power set-point, said produced active power comprising, in a frequency domain, one or more active power frequency components being different from one or more undesired frequency modes. The present invention also relates to a power plant controller for performing the method.

Method and control systems for voltage control in renewable energy power plant

Aspects of the present invention relate to a method of voltage control for at least one wind turbine generator configured to absorb and supply reactive power on demand, the method comprises: receiving a dispatch signal from a power plant controller indicating a reactive power set point; determining a terminal voltage level of the at least one wind turbine generator; generating a reactive power correction value based on a deviation of the terminal voltage level from a voltage set point; adjusting the reactive power set point by the reactive power correction value; and controlling the at least one wind turbine generator according to the adjusted reactive power set point.

WIND TURBINE PROVIDING GRID SUPPORT

A variable speed wind turbine is arranged to provide additional electrical power to counteract non-periodic disturbances in an electrical grid. A controller monitors events indicating a need to increase the electrical output power from the wind turbine to the electrical grid. The controller is arranged to control the wind turbine as follows: after an indicating event has been detected, the wind turbine enters an overproduction period in which the electrical output power is increased, wherein the additional electrical output power is taken from kinetic energy stored in the rotor and without changing the operation of the wind turbine to a more efficient working point. When the rotational speed of the rotor reaches a minimum value, the wind turbine enters a recovery period to re-accelerate the rotor to the nominal rotational speed while further contributing to the stability of the electrical grid by outputting at least a predetermined minimum electrical power. 1. (canceled)2. A wind turbine for connection to an electrical grid , the wind turbine comprising:a rotor with blades coupled to an electrical generator; and increase, in response to an event, an electrical output power from the wind turbine using kinetic energy stored in the rotor thereby decreasing a rotational speed of the rotor, wherein the event indicates a need to increase the electrical output power from the wind turbine to the electrical grid to support the stability of the electrical grid, and', 'after increasing the electrical output power and before the rotational speed of the rotor reaches a predetermined minimum value, accelerate the rotor to a previous rotational speed while outputting at least a predetermined minimum electrical power to the electrical grid., 'a controller configured to3. The wind turbine according to claim 1 , wherein the controller is configured to control the wind turbine such that the predetermined minimum output power outputted during an recovery period is a fixed percentage of ...

Power system and method for operating a wind power system with a dispatching algorithm

The present invention relates to a power system having a plurality wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators, where each of the plurality of wind turbine generator being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generator according to an active power set point received from the wind power plant controller; a first subset of wind turbine generators operating at an active power output unrestricted of the active power set point; and a second subset of wind turbine generators operating according to an active power set point; and wherein the wind power plant controller communicates the active power set point, in accordance with the active power output of the first subset of the plurality of wind turbines generators, so as to reduce active power fluctuation of the aggregated active power output of the first and second ...

Method for coordinating frequency control characteristics between conventional plants and wind power plants

The present invention relates to a method for operating an electrical power system, comprising at least one wind turbine generator and at least one other power source, the method comprises the steps of, setting a set of technical requirements and limits for the electrical power system, including a total power reserve and at least one of: maximum electrical frequency deviation and allowable wind power electrical frequency fluctuations, distributing the total power reserve between the at least one other power source and a total wind power capacity available from the at least one wind turbine generator, and calculating in response thereto an amount of power reserve from the at least one wind turbine generator, and providing settings for a wind power controller, the settings comprising the set of technical requirements and the amount of power reserve from the at least one wind turbine generator. The invention also relates to a power plant operating according to the method.

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.

Wind power plant frequency control

A method of operating a wind power plant, with at least one wind turbine generator connected to an electrical grid is provided. The method includes 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.

Systems and methods for generating an inertial response to a change in the voltage of an electricial grid

Systems, methods, and computer program products for providing an inertial response by a wind power system to power fluctuations in an electrical grid. The system includes a synthetic inertial response generator configured to generate a power offset in response to fluctuations in grid voltage. The power offset signal is generated by determining a quadrature component the grid voltage using an internal reference voltage having an angular frequency and phase angle that is synchronized to the electrical grid by a control loop. The quadrature component is used to determine a synchronous power level. A control loop error signal is produced by the difference between the synchronous power level and the wind turbine system power output. Changes in the grid frequency produce an error signal that is added to the power set point of wind turbine system output controllers to provide a power system inertial power output response.

Power system and method for operating a wind power system with a dispatching algorithm

The present invention relates to a power system having a plurality wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators, where each of the plurality of wind turbine generator being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generator according to an active power set point received from the wind power plant controller; a first subset of wind turbine generators operating at an active power output unrestricted of the active power set point; and a second subset of wind turbine generators operating according to an active power set point; and wherein the wind power plant controller communicates the active power set point, in accordance with the active power output of the first subset of the plurality of wind turbines generators, so as to reduce active power fluctuation of the aggregated active power output of the first and second ...

SYSTEMS AND METHODS FOR GENERATING AN INERTIAL RESPONSE TO A CHANGE IN THE VOLTAGE OF AN ELECTRICAL GRID

Systems, methods, and computer program products for providing an inertial response by a wind power system to power fluctuations in an electrical grid. The system includes a synthetic inertial response generator configured to generate a power offset in response to fluctuations in grid voltage. The power offset signal is generated by determining a quadrature component the grid voltage using an internal reference voltage having an angular frequency and phase angle that is synchronized to the electrical grid by a control loop. The quadrature component is used to determine a synchronous power level. A control loop error signal is produced by the difference between the synchronous power level and the wind turbine system power output. Changes in the grid frequency produce an error signal that is added to the power set point of wind turbine system output controllers to provide a power system inertial power output response. 1. A method for controlling a power output from a wind power system coupled with an electrical grid at a connection point , the method comprising:measuring, at the connection point, a grid voltage of the electrical grid;comparing a first phase angle of the grid voltage to a second phase angle of an internal reference voltage to generate a quadrature component of the grid voltage;generating, based on the quadrature component of the grid voltage, a synthetic inertial response signal representing a desired inertial response to be provided to the electrical grid by the wind power system; andapplying, responsive to a magnitude of the generated synthetic inertial response signal exceeding a non-zero predefined threshold value, a power offset signal to a power set point signal of the wind power system,wherein the power offset signal includes the synthetic inertial response signal as a component.2. The method of claim 1 , further comprising: generating a feedback signal from a mathematical product of the angular frequency of the internal reference voltage and a ...

METHOD FOR CONTROLLING A POWER PLANT

The present invention relates to a method for operating a power plant comprising a plurality of power producing units, the power plant being operatively connected to an associated power grid having a nominal grid frequency, the method comprising the steps of determining grid frequency variations of the associated power grid, and providing, in response to the determined grid frequency variations, an active power set-point to each of the plurality of power producing units, said active power set-point causing each of the plurality of power producing units to produce active power in response to said active power set-point, said produced active power comprising, in a frequency domain, one or more active power frequency components being different from one or more undesired frequency modes. The present invention also relates to a power plant controller for performing the method. 1. A method for operating a power plant comprising a plurality of power producing units , the power plant being operatively connected to an associated power grid having a nominal grid frequency , the method comprising:a) determining grid frequency variations of the associated power grid, andb) providing, in response to the determined grid frequency variations, an active power set-point to each of the plurality of power producing units, said active power set-point causing each of the plurality of power producing units to produce active power in response to said active power set-point, said produced active power comprising, in a frequency domain, one or more active power frequency components being different from one or more undesired frequency modes.2. The method of claim 1 , wherein the one or more undesired frequency modes comprise one or more preselected frequency modes.3. The method of claim 2 , wherein the one or more preselected frequency modes comprise one or more known natural frequency modes of the power producing units claim 2 , such as one or more tower natural frequency modes.4. The ...

METHOD FOR COORDINATING FREQUENCY CONTROL CHARACTERISTICS BETWEEN CONVENTIONAL PLANTS AND WIND POWER PLANTS

The present invention relates to a method for operating an electrical power system, comprising at least one wind turbine generator and at least one other power source, the method comprises the steps of, setting a set of technical requirements and limits for the electrical power system, including a total power reserve and at least one of: maximum electrical frequency deviation and allowable wind power electrical frequency fluctuations, distributing the total power reserve between the at least one other power source and a total wind power capacity available from the at least one wind turbine generator, and calculating in response thereto an amount of power reserve from the at least one wind turbine generator, and providing settings for a wind power controller, the settings comprising the set of technical requirements and the amount of power reserve from the at least one wind turbine generator. The invention also relates to a power plant operating according to the method. 1. Method for operating an electrical power system , comprising at least one wind turbine generator and at least one other power source , the method comprises:setting a set of technical requirements and limits for the electrical power system, including a total power reserve and at least one of: maximum electrical frequency deviation and allowable wind power electrical frequency fluctuations;distributing the total power reserve between the at least one other power source and a total wind power capacity available from the at least one wind turbine generator, and calculating in response thereto an amount of power reserve from the at least one wind turbine generator;providing settings for a wind power controller, the settings comprising the set of technical requirements and the amount of power reserve from the at least one wind turbine generator.2. Method according to claim 1 , wherein the method further comprises:detecting if the electrical power system is in a normal operation mode or in a disturbance ...

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 ...

CONSTANT TORQUE CONTROL OF A WIND TURBINE USING AN ENERGY STORAGE SYSTEM

A method for controlling a wind turbine is disclosed. During full load operation, a power reference value, Pref, representing a power level to be supplied to the power grid by the wind turbine, is received, and the wind turbine is controlled in order to produce an output power which is at or near the power reference value, Pref, while maintaining a constant torque on the generator. In the case that the produced output power of the wind turbine exceeds the power reference value, Pref, excess produced energy is stored in the energy storage system, and in the case that the produced output power of the wind turbine is below the power reference value, Pref, stored energy is retrieved from the energy storage system. A power level being equal to the power reference value, Pref, is supplied to the power grid. 1. A method for controlling a wind turbine , the wind turbine comprising a rotor carrying a set of wind turbine blades and connected to an input shaft , an output shaft connected to a generator , the generator being arranged to supply power to a power grid , and an energy storage system for intermediate storage of energy produced by the generator , the method comprising:during full load operation, receiving a power reference value, Pref, representing a power level to be supplied to the power grid by the wind turbine;controlling the wind turbine in order to produce an output power which is at or near the power reference value, Pref, while maintaining a constant torque on the generator;in the case that the produced output power of the wind turbine exceeds the power reference value, Pref, storing excess produced energy in the energy storage system and supplying a power level being equal to the power reference value, Pref, to the power grid; andin the case that the produced output power of the wind turbine is below the power reference value, Pref, retrieving stored energy from the energy storage system and supplying a power level being equal to the power reference value, ...

POWER SYSTEM AND METHOD FOR OPERATING A WIND POWER SYSTEM WITH A DISPATCHING ALGORITHM

The present invention relates to a power system having a plurality wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators, where each of the plurality of wind turbine generator being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generator according to an active power set point received from the wind power plant controller; a first subset of wind turbine generators operating at an active power output unrestricted of the active power set point; and a second subset of wind turbine generators operating according to an active power set point; and wherein the wind power plant controller communicates the active power set point, in accordance with the active power output of the first subset of the plurality of wind turbines generators, so as to reduce active power fluctuation of the aggregated active power output of the first and second subset of the plurality of wind turbines generators. The present invention also relates to method accordingly. 1. A power system having a plurality wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators , comprising:each wind turbine generator in the plurality of wind turbine generators being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generators according to an active power set point received from the wind power plant controller;a first subset of wind turbine generators operating at an active power output unrestricted of the active power set point;a second subset of wind turbine generators operating according to an active power set point;and wherein the wind power plant controller communicates the active power set point, in accordance with the active power output of the first subset of the plurality of wind ...

Systems and methods for generating an inertial response to a change in the voltage of an electrical grid

Systems, methods, and computer program products for providing an inertial response by a wind power system to power fluctuations in an electrical grid. The system includes a synthetic inertial response generator configured to generate a power offset in response to fluctuations in grid voltage. The power offset signal is generated by determining a quadrature component the grid voltage using an internal reference voltage having an angular frequency and phase angle that is synchronized to the electrical grid by a control loop. The quadrature component is used to determine a synchronous power level. A control loop error signal is produced by the difference between the synchronous power level and the wind turbine system power output. Changes in the grid frequency produce an error signal that is added to the power set point of wind turbine system output controllers to provide a power system inertial power output response.

POWER PLANT & ENERGY STORAGE SYSTEM FOR PROVISION OF GRID ANCILLARY SERVICES

The present invention relates to method for operating a power plant, with at least one wind turbine generator arranged for supplying power to an electrical grid, at least one energy storage device arranged for supplying power to the electrical grid, and a power plant controller, the method comprises, measuring repetitively measurement sets of at least one electrical parameter from the electrical grid, and calculating, in respect the measurement sets of the at least one electrical parameter, a change in active and/or a required change in reactive power at a point of common coupling, and calculating and dispatching of a first control reference signal to the at least one wind turbine generator and a second control reference signal to the at least one energy storage device, for providing ancillary service functionalities to the electrical grid. The invention also relates to a power plant with at least one wind turbine generator for supplying power to an electrical grid, at least one energy storage device for supplying power to the electrical grid, and a power plant controller for providing ancillary service functionalities to the electrical grid. 1. Method for operating a power plant , comprising at least one wind turbine generator arranged for supplying power to an electrical grid , at least one energy storage device arranged for supplying power to the electrical grid , and a power plant controller , the method comprises:measuring repetitively measurement sets of at least one electrical parameter from the electrical grid,calculating, in respect of the measurement sets of the at least one electrical parameter, a change in active and/or a change in reactive power at a point of common coupling, andcalculating and dispatching of a first control reference signal to the at least one wind turbine generator and a second control reference signal to the at least one energy storage device, for providing ancillary service functionalities to the electrical grid.3. Method according ...

POWER SYSTEM AND METHOD FOR OPERATING A WIND POWER SYSTEM WITH A DISPATCHING ALGORITHM

The present invention relates to a power system having a plurality wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators, where each of the plurality of wind turbine generator being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generator according to an active power set point received from the wind power plant controller; a first subset of wind turbine generators operating at an active power output unrestricted of the active power set point; and a second subset of wind turbine generators operating according to an active power set point; and wherein the wind power plant controller communicates the active power set point, in accordance with the active power output of the first subset of the plurality of wind turbines generators, so as to reduce active power fluctuation of the aggregated active power output of the first and second subset of the plurality of wind turbines generators. The present invention also relates to method accordingly. 1. A power system having an active power output , the power system comprising:a plurality of wind turbine generators; assign each wind turbine generator of the plurality of wind turbine generators to a selected one of a first subset and a second subset; and', 'generate, based on a collective active power production of the first subset, one or more active power set points for one or more wind turbine generators of the second subset; and, 'a power plant controller configured to receive a respective active power set point;', 'when the respective wind turbine generator is assigned to the first subset, control an active power production of the respective wind turbine generator without being restricted by the respective active power set point; and', 'when the respective wind turbine generator is assigned to the second subset, restrict the active power production of the ...

variable speed wind turbine, variable speed wind turbine operation controller and method for controlling a variable speed wind turbine

A method for controlling a renewable power plant during voltage events

A method for controlling a current injected to a power grid (2) from a renewable power plant (1), in response to a voltage event in the power grid (2), is disclosed. Occurrence of a voltage event in the power grid (2) is detected. At least a current at a point of common coupling (3) between the renewable power plant (1) and the power grid (2) is determined, and the determined current is provided to a power plant controller (4). The power plant controller (4) derives individual current setpoint corrections for at least some wind turbines (5) within the renewable power plant (1), based on the determined current, and dispatches each derived current setpoint correction to wind turbine controllers (6) of the corresponding wind turbines (5). The wind turbine controllers (6) control a current output of the respective wind turbines (5), based on measurements of current and/or voltage at a point of connection (8) between the wind turbine (5) and an internal grid (7) of the renewable power plant (1), and by taking the current setpoint correction dispatched from the power plant controller (4) into account.

Wind turbine providing grid support

A method for controlling a renewable power plant during voltage events

A method for controlling a current injected to a power grid (2) from a renewable power plant (1), in response to a voltage event in the power grid (2), is disclosed. Occurrence of a voltage event in the power grid (2) is detected. At least a current at a point of common coupling (3) between the renewable power plant (1) and the power grid (2) is determined, and the determined current is provided to a power plant controller (4). The power plant controller (4) derives individual current setpoint corrections for at least some wind turbines (5) within the renewable power plant (1), based on the determined current, and dispatches each derived current setpoint correction to wind turbine controllers (6) of the corresponding wind turbines (5). The wind turbine controllers (6) control a current output of the respective wind turbines (5), based on measurements of current and/or voltage at a point of connection (8) between the wind turbine (5) and an internal grid (7) of the renewable power plant (1), and by taking the current setpoint correction dispatched from the power plant controller (4) into account.

Constant torque control of a wind turbine using an energy storage system

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.

Wind turbine providing grid support

Method for emulation of synchronous machine

The present invention relates to electric energy sources, such as a single wind power turbine or wind power plant, that are interfaced with the utility grid through power electronic converters. In particular, the present invention relates to specific techniques and methodologies for power electronic converters for stabilizing the utility grid during transient conditions and for providing similar stability mechanisms that are inherently present in electric synchronous generators while maintaining the possibility for fast and decoupled following of set points for generated active and/or reactive powers.

Method for reducing high torque levels and torque gradients in wind turbine generators

Aspects of the present invention relate to a method for reducing high torque levels and/or high rates of change of torque in a wind turbine generator that comprises a machine-side converter and a line-side converter connected by a DC link, and, wherein the line-side converter is operated according to a virtual synchronous machine control scheme. The method comprises: determining a generator torque; determining a torque surplus indicating the amount that the generator torque exceeds a torque limit; determining an active power surplus corresponding to the torque surplus; controlling the line-side converter according to the virtual synchronous machine control scheme using an input parameter configured to reduce the active power output of the line side converter by the active power surplus.

Method and control systems for voltage control in renewable energy power plant

Aspects of the present invention relate to a method of voltage control for at least one wind turbine generator (14) configured to absorb and supply reactive power on demand, the method comprises: receiving a dispatch signal from a power plant controller (22) indicating a reactive power set point (Qunit n setp); determining a terminal voltage level (Vunit) of the at least one wind turbine generator (14); generating a reactive power correction value (Qcorrect) based on a deviation of the terminal voltage level (Vunit) from a voltage set point (Vunit n-setp); adjusting the reactive power set point (Qunit n setp) by the reactive power correction value (Qcorrect); and controlling the at least one wind turbine generator according to the adjusted reactive power set point (Qunit n control).

Method for detecting power oscillation in an electric power grid

A method for detecting power oscillation in an electric power grid, wherein the method comprises: integrating a filtered signal on a first interval, the filtered signal being associated with the electric power grid; based on the integration of the filtered signal on the first interval, determining a positive half-period area of the filtered signal and a negative half-period area of the filtered signal, one of the positive half-period area and negative half-period area being immediately subsequent to the other one; and determining that a power oscillation in the electric power grid is detected if the following two conditions are met:a sum of the positive half-period area of the filtered signal and the negative half-period area of the filtered signal is below a first threshold; andthe absolute value of one of the positive half-period area and negative half-period area is above a second threshold.

A method for detecting power oscillation in an electric power grid

A method for detecting power oscillation in an electric power grid (102), wherein the method comprises: integrating (201a) a filtered signal (134) on a first interval (136a), the filtered signal (134) being associated with the electric power grid (102); based on the integration of the filtered signal (134) on the first interval (136a), determining (202a) a positive half-period area ( A ) of the filtered signal and a negative half-period area ( B ) of the filtered signal (134), one ( A, B ) of the positive half-period area ( A ) and negative half-period area ( B ) being immediately subsequent to the other one ( A, B ); and determining (203a) that a power oscillation in the electric power grid (102) is detected if the following two conditions are met: • a sum of the positive half-period area ( A ) of the filtered signal (134) and the negative half-period area ( B ) of the filtered signal (134) is below a first threshold; and • the absolute value of one ( A, B ) of the positive half-period area ( A ) and negative half-period area ( B ) is above a second threshold.

Method for reducing high torque levels and torque gradients in wind turbine generators

Aspects of the present invention relate to a method (100) for reducing high torque levels and/or high rates of change of torque in a wind turbine generator (10) that comprises a machine-side converter (28) and a line-side converter (30) connected by a DC link (32), and, wherein the line-side converter (30) is operated according to a virtual synchronous machine control scheme. The method (100) comprises: determining (102) a generator torque (Tref); determining (104) a torque surplus (Tsurplus) indicating the amount that the generator torque (Tref) exceeds a torque limit; determining (106) an active power surplus (Psurplus) corresponding to the torque surplus (Tsurplus); controlling (108) the line-side converter (30) according to the virtual synchronous machine control scheme using an input parameter configured to reduce the active power output of the line side converter (30) by the active power surplus (Psurplus).

Wind park power oscillation control

A method is provided for controlling power oscillations at a point of common coupling (30) in a wind park (200). Individual power reference offsets (56) defining an adjustment to a wind turbine power reference signal (55) for counteracting mechanical oscillations in the respective wind turbines are received from respective wind turbine controllers (50). Based on an aggregated power reference offset, a total power oscillation compensation signal is determined. individual power oscillation compensation signals (62) for adjusting the wind turbine power reference signal (55) of respective wind turbines (10) are determined based on the individual power reference offsets (56) and the total power oscillation compensation signal. These individual power oscillation compensation signals are then sent to the respective wind turbines (10).

Method for controlling a renewable power plant during voltage events

Controlling a current injected to a power grid from a renewable power plant, in response to a voltage event in the power grid. At least a current at a point of common coupling between the renewable power plant and the power grid is determined and provided to a power plant controller (PPC). The PPC derives individual current setpoint corrections for at least some wind turbines, based on the determined current, and dispatches each derived current setpoint correction to wind turbine controllers of the corresponding wind turbines. The wind turbine controllers control a current output of the respective wind turbines, based on measurements of current and/or voltage at a point of connection between the wind turbine and an internal grid of the renewable power plant, and by taking into account the dispatched current setpoint correction.

Wind park power oscillation control

A method is provided for controlling power oscillations at a point of common coupling in a wind park. Individual power reference offsets defining an adjustment to a wind turbine power reference signal for counteracting mechanical oscillations in the respective wind turbines are received from respective wind turbine controllers. Based on an aggregated power reference offset, a total power oscillation compensation signal is determined. Individual power oscillation compensation signals for adjusting the wind turbine power reference signal of respective wind turbines are determined based on the individual power reference offsets and the total power oscillation compensation signal. These individual power oscillation compensation signals are then sent to the respective wind turbines.

Grid forming wind turbine with an electric storage

The invention relates to a method for controlling power generation of a VSM wind turbine. The wind turbine comprises a machine side converter, a line side converter, a DC link, and an electric storage device electrically connected to the DC link. The method comprises determining a first power control signal to the machine side converter, determining a second power control signal for controlling a desired output power of the line side converter based on a storage device voltage error, and a power production reference, and determining a charging current reference for controlling charging and discharging of the electric storage device based on a DC-link voltage error.