УСТРОЙСТВО И СПОСОБ ПОДДЕРЖКИ СИСТЕМЫ ГЕНЕРИРОВАНИЯ ЭЛЕКТРОЭНЕРГИИ ЛЕТАТЕЛЬНОГО АППАРАТА

Изобретение относится к устройству (17) поддержки системы (11) генерирования электроэнергии, упомянутая система (11) содержит генератор (13), регулятор (14) и контактор (15), содержащий контакты и привод размыкания/замыкания контактов, управляемый упомянутым регулятором (14) и расположенный между генератором (13) и компоновкой (12) распределения, при этом устройство (17) поддержки подключено, по меньшей мере, к одному источнику (18) питания, отличному от генератора (13) и от регулятора (14), и тем, что содержит средства замыкания контактора, выполненные с возможностью подсоединения источника (18) питания к приводу (23) контактора (15) для подачи тока, необходимого для замыкания упомянутого контактора (15). Техническим результатом является предотвращение неисправностей системы. 2 н. и 7 з.п. ф-лы, 2 ил.

УСТРОЙСТВО ДЛЯ ЗАЩИТЫ ГЕНЕРАТОРА СИНХРОННОГО

Использование: в области электротехники. Технический результат - обеспечение защиты генератора синхронного от коротких замыканий и предотвращение ложного срабатывания защиты при пуске синхронных двигателей без использования трансформаторов тока. Устройство для защиты генератора синхронного содержит исполнительный орган в виде трехфазного выпрямителя напряжения генератора с делителем напряжения, фильтр низкой частоты, уставку срабатывания напряжения, элемент задержки и исполнительный элемент. В устройство введен измеритель несимметрии выходного напряжения генератора на усилителе-компараторе, сравнивающем мгновенное выпрямленное напряжение генератора с частью его средневыпрямленного значения и расширителе импульсов, при этом устройство получает питание от выпрямленного напряжения генератора и его дополнительной обмотки. 7 ил.

УСТРОЙСТВО ДЛЯ ПРЕВЕНТИВНОЙ ЗАЩИТЫ СУДОВОЙ ЭЛЕКТРОЭНЕРГЕТИЧЕСКОЙ СИСТЕМЫ

Изобретение относится к области электротехники, в частности к устройствам для превентивной защиты судовой электроэнергетической системы. Технический результат заключается в повышении достоверности управления при формировании команд на запуск аварийного генераторного агрегата. Достигается тем, что в устройство для защиты судовой электроэнергетической системы, содержащее по числу генераторных агрегатов (ГА): датчики активной нагрузки, блоки контроля технического состояния ГА, датчики работы ГА, а также блок идентификации режима запуска АГА и блок запуска АГА, при этом выходы датчиков активной нагрузки соединены с первыми соответствующими входами блока идентификации режима запуска АГА, выходы блоков контроля технического состояния ГА соединены с соответствующими вторыми входами блока идентификации режима запуска АГА, выходы датчиков работы соединены с третьими соответствующими входами блока идентификации режима запуска АГА, при этом дополнительно включен блок отключения групп потребителей ...

СПОСОБ ЗАЩИТЫ ЛИНИЙ ЭЛЕКТРОПЕРЕДАЧИ ПРИ НЕУСПЕШНОМ ОДНОФАЗНОМ ПОВТОРНОМ ВКЛЮЧЕНИИ

Использование: в области электроэнергетики в высокочастотных защитах линий электропередачи с пофазным управлением выключателями. Технический результат - обеспечение быстродействия отключения линии электропередачи при неуспешном однофазном автоматическом повторном включении (ОАПВ). Для защиты линии применено комбинированное реле тока обратной последовательности и его аварийной составляющей. Параметры срабатывания реле рассчитываются по сигналу однофазного автоматического повторного включения по токам предшествующего неполнофазного режима. Параметры адаптивно вводятся в реле тока в качестве уставок для защиты линии при неуспешном ОАПВ отключавшейся фазы. 1 ил.

Способ защиты от короткого замыкания магнитоэлектрического генератора

Изобретение относится к области электромашиностроения и может быть использовано в магнитоэлектрических генераторах для защиты от короткого замыкания. Техническим результатом является повышение надежности работы магнитоэлектрического генератора за счет защиты от короткого замыкания обмоток. Способ защиты от короткого замыкания магнитоэлектрического генератора, по которому наличие короткого замыкания определяют по величине температуры, величине тока и величине напряжения, отличающийся тем, что после обнаружения короткого межвиткового замыкания на катушке, которая гальванически и термически развязана от других катушек фазы магнитоэлектрического генератора, катушку отсоединяют от других катушек обмотки и коммутируют ее саму на себя. 2 ил., 1 табл.

СИСТЕМА УПРАВЛЕНИЯ ВЫРАБОТКОЙ ЭЛЕКТРИЧЕСКОЙ ЭНЕРГИИ

Использование: в области электротехники. Технический результат - повышение надежности. Система управления выработкой электрической энергии включает энергоблоки, подключенные в сеть по параллельной схеме и включающие силовую установку, электрический генератор, выключатели, программируемые средства управления и защиты. К электрической сети параллельно энергоблокам подключено, по меньшей мере, одно активное нагрузочное устройство. Программируемые средства управления и защиты включают микропроцессорную систему возбуждения с преобразователем на биполярных транзисторах с изолированным затвором, контроллер автоматической регулировки усиления и контроллер дифференциальной защиты электрического генератора. Контроллеры соединены между собой и с микропроцессорной системой возбуждения, выключателями и станционным компьютером управления энергоблоками, являющимся оконечным пунктом двустороннего беспроводного канала связи с диспетчерским компьютером удаленного управления и контроля энергоблоков. 14 з.п ...

СПОСОБ ЗАЩИТЫ ЛИНИЙ ЭЛЕКТРОПЕРЕДАЧИ С ВОЗОБНОВЛЯЕМЫМИ ИСТОЧНИКАМИ ЭЛЕКТРОЭНЕРГИИ

Использование: в области электроэнергетики для защиты линий электропередачи с возобновляемыми источниками энергии (ВИЭ). Технический результат - обеспечение быстродействия и абсолютной селективности защиты на линиях с ВИЭ. Согласно способу защиты линий электропередачи с возобновляемыми источниками энергии с трехфазным управлением выключателями, в том числе с ответвлениями, на каждом конце формируются высокочастотные сигналы для передачи на другой конец линии, при этом на конце с возобновляемыми источниками энергии формируется блокирующий сигнал, со стороны питающего конца сети при определении повреждения в линии формируется отключающий сигнал, который на другом конце линии с возобновляемыми источниками энергии при срабатывании на этом конце максимального реле направления мощности обратной последовательности или минимального реле тока прямой последовательности, подготавливающих цепи отключения, дает разрешение на отключение. На питающем конце линии отключение производится при срабатывании ...

Способ управления системой защиты магнитоэлектрического генератора от короткого замыкания

Использование: в области электротехники. Технический результат: повышение надежности системы управления, системы защиты и пожаробезопасности магнитоэлектрического генератора. Согласно способу после обнаружения короткого замыкания на фазной обмотке генератора, данную обмотку последовательно соединяют с обмоткой подмагничивания, увеличивают индуктивное сопротивление фазной обмотки и уменьшают ток короткого замыкания до номинального, а после этого отключают магнитоэлектрический генератор от привода, с возможностью обеспечения защиты от перегрева магнитоэлектрического генератора. 1 ил.

Устройство для уменьшения искрообразования в узле скользящего токосъема

Полезная модель относится к схемам защиты электрических генераторов, а именно к устройствам для уменьшения искрообразования в узлах скользящего токосъема. Технический результат заключается в уменьшении габаритов и, как следствие, повышении удобства его монтажа на реальном узле токосъема. Устройство содержит электрическую емкость, подключенную между параллельно электрически соединенными группами щеток, размещенных в щеткодержателях одного контактного кольца узла скользящего токосъема, причем одна группа щеток соединена с силовой шиной, вторая группа щеток изолирована от силовой шины. Электрическая емкость состоит из двух групп параллельно соединенных конденсаторов - полярных и неполярных, одни выводы группы конденсаторов соединены непосредственно, а вторые - через индуктивность, между выводами группы полярных конденсаторов подключен диод катодом к положительному выводу группы полярных конденсаторов. Все щеткодержатели группы щеток, механически подсоединенных к силовой шине, электрически ...

Generator-Motorvorrichtung mit veränderbarer Geschwindigkeit.

VERFAHREN ZUR BEGRENZUNG EINES ELEKTRISCHEN STROMS DURCH EIN ELEKTRISCHES BAUTEIL UND BEGRENZUNGSVORRICHTUNG

Schutzeinrichtung fuer elektrische Maschinen

Drehende elektrische Maschine für ein Fahrzeug

Eine drehende elektrische Maschine für ein Fahrzeug wird bereitgestellt. Eine drehende elektrische Maschine enthält eine Leistungssystemschaltung, die ein Leistungselement aufweist und mit einem ersten Masseanschluss und einer ersten Verbindungsleitung geerdet ist, und eine Steuersystemschaltung, welche die Leistungssystemschaltung steuert und über einen zweiten Masseanschluss und eine zweite Verbindungsleitung geerdet ist.

Circuit of a field regulator desired value loop for a synchronous alternator

The invention relates to field regulator desired value loops for synchronous alternators and creates a new circuit arrangement of such loops. The idea of the invention is that the sliding contact of the desired value potentiometer, which forms the first output of the circuit, is connected on the one hand to the output of the constant current source and on the other hand to the input of an evaluation circuit. The output of this evaluation circuit forms the second circuit output.

Einrichtung zum Schutz von Wechselstromgeneratoren mit zwei parallelen Wicklungssystemen beim Auftreten von Fehlerstellen innerhalb des Generators

Sicherheitseinrichtung fuer ein selbsttaetiges Nebenkraftwerk

Einrichtung zur UEberwachung des Isolationszustandes von Gleichstromsystemen

SCHUTZEINRICHTUNG ZUR UEBERWACHUNG DER ERWEITERTEN STABILITAETSGRENZE EINER SYNCHRONMASCHINE

Protection circuitry for monitoring the power devices controlling the exciter current of an electrical generator

Protection circuitry for monitoring the power devices controlling the exciter current of an electrical generator

Reduction in generator-sourced fault current contribution

A system 100 for reducing generator-sourced fault current contribution from a power plant to a point of interconnection with an electrical power distribution network includes a generator 105 having a field winding 110 that that is configured to generate a magnetic field in response to receiving a field excitation current, and a generator terminal 115, configured to generate an output voltage that is a function of the field excitation current applied to the field winding. A generator step-up transformer 120 is coupled to the generator terminal and adjusts the output voltage for interconnection with a power distribution network. An excitation system 135 supplies the field excitation current the field winding of the generator. An excitation system compensator 145 regulates the field excitation current to effect a change in the output voltage as a function of the reactive power generated from the generator to reduce generator-sourced fault current contribution to the electrical power distribution ...

Engine-alternator sets

An engine-alternator set 10 connected to an electrical load is controlled by a system having a facia 20 for displaying alternator (electrical) parameters 21, engine (non-electrical) parameters 22 respectively associated with alternator alarms and engine alarms, and status parameters 23 associated with manually-operable READY/RESET and START/STOP switches 23B, 23A. The control system incorporates preprogrammable logic which is responsive to a START signal to effect programmed start-up of the set 10 and which is responsive to preselected alarm conditions to shutdown the set 10 automatically. ...

POLYPHASE AC GENERATOR CONTROL CIRCUIT

... 1431765 Synchronous machines LUCAS INDUSTRIES Ltd 5 April 1973 [13 April 1972] 17018/72 Heading H2A The phase voltages of a polyphase generator are averaged and also monitored for unbalance, the generator output being controlled by a signal proportional to the difference between a reference value and the degree of unbalance in the generator phase outputs, this control signal being applied to an excitation control via a differential amplifier also receiving the average phase voltage as an input. The excitation control comprises a pulse-width modulator 25 controlled by the reduced average signal from error amplifier 24 and which varies the mark/space ratio of the output from transistor 17, thus controlling the generator excitation through winding 15, to reduce unbalance.

Multiple supply voltage motor assembly

ARRANGEMENT FOR PROTECTING A TURBO-SET FROM OVERLOADING DUE TO A FAULT IN AN ASSOCIATED ELECTRICAL SYSTEM

... 1500370 Protecting generators KRAFTWERK UNION AG 14 March 1975 [29 March 1974] 10865/75 Heading H2K A generator is automatically disconnected (12) from a distribution system if, on occurrence of a fault anywhere in the system, it drifts out of synchronism. This prevents damage to the generator when the protective system dealing with the fault subsequently recloses. A detector 11 monitors the amplitude of the positive phase sequence voltage of the system at the location of the generator. If there is a large drop in this voltage, signifying a fault close to the generator, a threshold detector 21 trips the circuit breaker 12. If, however, there is a smaller voltage drop, signifying a more remote fault, a threshold detector 20 puts into action a phase monitoring circuit. The system frequency immediately prior to the occurrence of the voltage drop is stored (23) and subsequently continuously compared (27) with the instantaneous generator frequency. Any discrepancy is integrated (26) to give ...

Improvements relating to electricity distributing systems and protective arrangements therefor

... 878,954. Protective arrangements. C.A.V. Ltd. Sept. 30, 1959 [Oct. 1, 1958], No. 31416/58. Class 38 (5). In a system comprising a three-phase generator a supplying a battery c through rectifiers b, an electromagnetically operated switch e opens the circuit of the generator field winding d in the event of failure of any of the rectifiers. The switch has a pair of opposed windings f, f 1 , both connected at one end to one of the phases of the generator and at their other ends connected respectively to the positive and negative sides of the battery. In the event of failure of a rectifier, the windings f, f 1 are not equally energized and the switch e is opened. An indicating lamp g may be controlled by auxiliary contacts i of the switch e and by a push-button switch K.

AUTOMATISCHER ÜBERSPANNUNGSSCHUTZ FÜR EINEN WECHSELSTROMGENERATOR IN EINEM LOKOMOTIVEN-ANTRIEBSSYSTEM

ADAPTIVE PROTECTIVE FUNCTION ATTITUDES WITH ELECTRICAL MACHINES

SCHALTUNGSANORDNUNG ZUR ERHOHUNG DER SICHERHEIT DER BETRIEBSFUHRUNG VOR ALLEM GROSSER ELEKTRISCHER MASCHINENSATZE MIT MINDESTENSZWEI PARALLELGESCHALTETEN BLOCKTRANSFORMATOREN

Verfahren zur Ermittlung eines Polradwinkels

A method of determining a rotor displacement angle of a synchronous generator having a rotor and electrically connected to a power supply network uses at least one rotary speed measuring device. During a revolution of the rotor, in particular during each revolution of the rotor, the measuring device communicates at least one rotary speed signal to an evaluation unit. A frequency measuring device communicates a frequency signal to the evaluation unit for each period duration of a voltage signal of the power supply network. A time duration between communication of the rotary speed signal and communication of the frequency signal is determined by the evaluation unit, and the rotor displacement angle is inferred in dependence on the determined time duration.

Verfahren zur Erkennung von Polschlupf

Method for identifying pole slip of an electrical generator (2), in particular synchronous generator, which is electrically connected to a power supply system (1), wherein a rotor (3) of the generator (2) is mechanically connected to a motor shaft (4) of an internal combustion engine(5), in particular of a gas engine, wherein the internal combustion engine (5) is operated at a substantially constant mechanical rotation frequency (n) in a stationary operating mode, wherein the mechanical rotation frequency (n) of the motor shaft (4) and an electrical rotation frequency (f) of the power supply system (1) are detected or ascertained, wherein a signal (11) is output in the event of a deviation (6) in the mechanical rotation frequency (n) from the electrical rotation frequency (f) of greater than a prespecifiable threshold value (7), wherein the signal (11) is considered to be a detected pole slip.

SWITCHING CONFIGURATION FOR ERHOHUNG THE SECURITY OF THE BETRIEBSFUHRUNG ABOVE ALL LARGE ONE ELECTRICAL SET WITH MINDESTENSZWEI BLOCK TRANSFORMERS JOINED IN PARALLEL

MECHANISM FOR THE DELIMITATION OF IN OF A TURBINE GENERATOR WAVE WHEN SWITCHING A THREE POLE NET SHORT-CIRCUIT OF ARISING TORQUE OFF

MECHANISM FOR THE PROTECTION OF THE STATOR WINDING OF SYNCHRONOUS GENERATORS AGAINST GROUND FAULTS

SWITCHING CONFIGURATION FOR ERHOHUNG THE SECURITY OF THE BETRIEBSFUHRUNG ABOVE ALL LARGE ONE ELECTRICAL SET WITH MINDESTENSZWEI BLOCK TRANSFORMERS JOINED IN PARALLEL

SHORT-CIRCUIT PROTECTION SYSTEM FOR THREE-PHASE ALTERNATING CURRENT SYNCHRONOUS GENERATORS

EARTH ERROR PROTECTION DEVICE FOR THE COIL OF AN ELECTRICAL MACHINE

Fault handling method and apparatus for wind power generator set, and computer readable storage medium

A fault handling method and apparatus for a wind power generator set, and a computer readable storage medium. The fault handling method comprises: dividing faults of a wind power generator set into groups according to a target protection object, each group of faults including a plurality of process faults associated with the target protection object and a target fault of the target protection object (101); if any one of the plurality of process faults in the same group as the target fault satisfies a corresponding process fault trigger condition and the target fault does not satisfy the corresponding target fault trigger condition, performing a fault-tolerant operation on the wind power generator set (102); if the target fault satisfies the corresponding target fault trigger condition, selecting, from the triggered process faults in the same group as the target fault, the process fault having the highest degree of association as a real fault that has caused shut-down of the wind power generator ...

Power distribution system having priority load control

A power distribution system (10) is disclosed. The power distribution system may have a generator (38), a first load interruption device (40) associated with the generator, and a load (14) powered by the generator. The power distribution system may also have a second load interruption device (28) associated with the load, and a generator controller (46). The generator controller may be configured to control the generator, determine existence of a fault condition associated with electric service between the generator and the load, and selectively activate the second load interruption device based on the determination. The generator controller may be further configured to determine if activation of the second load interruption device isolated the fault condition, and selectively activate the first load interruption device when activation of the second load interruption device fails to isolate the fault condition.

Relay protection method and device against LC parallel circuit detuning faults

A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current of an equivalent capacitor; calculate amplitudes of the current of the equivalent capacitor and a current of a realistic capacitor, and calculate an amplitude of the total current flowing through the LC; calculate a current amplitude ratio of the equivalent capacitor to the realistic capacitor; and when the amplitude of the total current flowing through the LC is large enough, send an alarm signal or a trip signal by delay and output an idle contact of a trip relay if the current ratio exceeds a preset upper and lower limit range. Also provided is a corresponding relay protection device. The relay protection method and device against LC parallel circuit detuning faults can improve stability of ...

Method for identifying pole slip

Method for identifying pole slip of an electrical generator (2), in particular synchronous generator, which is electrically connected to a power supply system (1), wherein a rotor (3) of the generator (2) is mechanically connected to a motor shaft (4) of an internal combustion engine(5), in particular of a gas engine, wherein the internal combustion engine (5) is operated at a substantially constant mechanical rotation frequency (n) in a stationary operating mode, wherein the mechanical rotation frequency (n) of the motor shaft (4) and an electrical rotation frequency (f) of the power supply system (1) are detected or ascertained, wherein a signal (11) is output in the event of a deviation (6) in the mechanical rotation frequency (n) from the electrical rotation frequency (f) of greater than a prespecifiable threshold value (7), wherein the signal (11) is considered to be a detected pole slip.

An electrical machine winding ground-fault protection system

A protection device and method

PROTECTION METHOD AND PROTECTION DEVICE FOR DETECTING ASYNCHRONISM IN THE SYNCHRONOUS STARTING OF A SYNCHRONOUS MACHINE

... 88/099 Protection method and protection device for detecting asynchronism during the synchronous starting of a synchronous machine. During the run-up of high-power synchronous machines (6), such as those used in pumped storage plants, in gas turbines sets and so forth, unwanted alternating currents with slip frequencies between those of the phase swings and the nominal frequency (50 Hz) of the synchronous machine (6) can also occur in the disturbed condition in addition to low-frequency plant-specific phase swings. These alternating currents are induced in the field windings of the synchronous machine (6) as a consequence of an unwanted asynchronous starting and can lead to inadmissible heating of the synchronous machine and to overvoltages in the field circuit. Alternating voltages (U1) associated with the slip frequencies are detected from use of a sensing resistor (4) in the exciter current (if) of the synchronous machine (6), separated from the high-voltage potential in an isolating ...

METHOD AND ARRANGEMENT FOR PROTECTING TURBINE GENERATORS AGAINST SUBSYNCHRONOUS RESONANCES OCCURING IN POWER TRANSMISSION SYSTEMS

... of the disclosure: This invention relates to a method by means of which a turbine generator can be protected against subsynchronous frequencies occurring in an electric network which is connected to the turbine generator and which incorporates capacitors. The method is based on de-equal-izing the subsynchronous natural frequencies of the three phases, so as to weaken the coherence of the frequencies. This is achieved by incorporating in each of two of the phases a respective inductance L of mutually different size and by changing the capacitance equivalently with a series capacitance C such as to fulfill the condition 1/LC = .omega.?, where .omega.o is the network frequency.

STABILIZING EQUIPMENT FOR POWER TRANSMISSION SYSTEM

OVERVOLTAGE PROTECTION OF DOWNHOLE GENERATORS

The disclosed embodiments include a method to protect a downhole generator from overvoltage. In one embodiment, the method includes determining a speed of an alternator. The method also includes activating overvoltage protection mode if the speed of the alternator is greater than a threshold speed, where activating the overvoltage protection mode includes converting an alternating current measured at the alternator into a first component and a second component of a direct current. Activating the overvoltage protection mode also includes determining a first current threshold based on at least one component of the downhole generator. Activating the overvoltage protection mode also includes shutting down the downhole generator if the first component of the direct current is greater than the first current threshold and decreasing a magnetic flux of the downhole generator if the first component of the direct current is not greater than the first current threshold.

GROUND FAULT DETECTION

The present invention relates to a ground fault detection arrangement for a synchronous three-phase electrical machine, and an electrical system comp rising a ground fault detection arrangement and a synchronous three-phase el ectrical machine. The ground fault detection arrangement injects an off-nomi nal frequency voltage between a neutral point of the synchronous three-phase electrical machine and ground and measure resultant currents to detect a gr ound fault.

APPARATUS AND METHOD OF POWER CONTROL

The present invention relates to a power control apparatus and method, more particularly to a power control apparatus and method for stably controlling the over-current of a generator with a low system voltage. One embodiment of the present invention provides an apparatus for controlling the electric power in a generating system. The power control apparatus according to the embodiment of the present invention comprises a current comparator, a controller, a switch, and a resistor. The current comparator is connected to a generator that generates electric power, and calculates a current errorby comparing the current measured in the generator with the reference current of the generator. The controller calculates an effective power value by receiving the current error and outputs a switch-driving signal corresponding to the calculated effective power value. The switch is operated by the switch-driving signal of the controller. The resistor consumes the current within the error range by distributing ...

SUBTRANSIENT CURRENT SUPPRESSION

A system and method for subtransient current suppression in a power system. A generator is configured to provide an output current to a power distribution system. A current sensor is configured to sense the output current. A switch is configured to direct the output current to ground when the switch is closed. A controller is configured to close the switch for a time delay in response to identifying a level of the output current that is greater than a threshold level and to automatically open the switch in response to identifying an end of the time delay.

SUBTRANSIENT CURRENT SUPPRESSION

A system and method for subtransient current suppression in a power system. A generator is configured to provide an output current to a power distribution system. A current sensor is configured to sense the output current. A switch is configured to direct the output current to ground when the switch is closed. A controller is configured to close the switch for a time delay in response to identifying a level of the output current that is greater than a threshold level and to automatically open the switch in response to identifying an end of the time delay.

IMPROVEMENTS RELATING TO THE TRANSMISSION OF ENERGY

Apparatus for transmitting energy comprising an electrical machine arranged to convert between electrical and mechanical energy, and comprising a rotor (20) and control means (42, 44, 90) arranged to regulate the motion of the rotor to ensure that the power angle of the electrical machine is maintained within a range of a predetermined power angle. A signal generator (2, 6), such as a synchronous machine and associated flywheel, may generate a reference signal relating to the predetermined power angle and be powered by a frequency regulated electrical supply. The control means (42, 44, 90) may be a mechanical control linkage or servo control system and may regulate the output of the motion of the rotor in response to a change in its motion which the control means or a dedicated detection device detects. The electrical machine may be an electric motor, an electricity generator, or a machine switchable between motor and generator modes. The apparatus may generate electricity to supply to ...

SYSTEM AND METHOD FOR PROTECTING ELECTRICAL MACHINES

A system and method for protecting one or more electrical machines during a grid fault on an electrical system connected with the one or more electrical machines. The method includes detecting the grid fault on the electrical system(402); taking one or more first actions from a first set of actions based on the detected grid fault on the electrical system(404); detecting at least one operating condition of the electrical system after taking one or more first actions from the first set of actions based on the detected grid fault on the electrical system(406); and taking one or more second actions from a second set of actions based on the detected at least one operating condition of the electrical system(408).

METHOD FOR IDENTIFYING POLE SLIP

Method for identifying pole slip of an electrical generator (2), in particular synchronous generator, which is electrically connected to a power supply system (1), wherein a rotor (3) of the generator (2) is mechanically connected to a motor shaft (4) of an internal combustion engine(5), in particular of a gas engine, wherein the internal combustion engine (5) is operated at a substantially constant mechanical rotation frequency (n) in a stationary operating mode, wherein the mechanical rotation frequency (n) of the motor shaft (4) and an electrical rotation frequency (f) of the power supply system (1) are detected or ascertained, wherein a signal (11) is output in the event of a deviation (6) in the mechanical rotation frequency (n) from the electrical rotation frequency (f) of greater than a prespecifiable threshold value (7), wherein the signal (11) is considered to be a detected pole slip.

Vorrichtung zum selbsttätigen Ausserbetriebsetzen von Wechselstromwicklungen bei Eintritt einer Störung in der Wicklung.

Sicherheitsvorrichtung für Generatoren.

Einrichtung zum Schutz von Wechselstromgeneratoren beim Auftreten von Fehlerstellen innerhalb des Generators.

Einrichtung im Stromkreis elektrischer Maschinen zum Schutz der Wicklungen oder anderer stromdurchflossener Teile derselben gegen Überhitzung.

Schutzeinrichtung für Wechselstrom-Generatoren und-Transformatoren.

Einrichtung zur selbsttätigen Inbetriebnahme elektrischer Stromerzeugergruppen in einer automatischen Zentrale.

Erdschlussschutzeinrichtung für die Ankerwicklung von Gleichstrommaschinen und Einankerumformern.

Schaltung zum Schutz von Wicklungssystemen mit Nullpunkt gegen Erdschlüsse.

Erdschlüssschutzeinrichtung für Gleichstrommaschinen und Einankerumformer.

CO2-Löschvorrichtung zum Löschen von Generatorbränden.

Erdschlussschutzeinrichtung für Wechselstrom-Generatoren.

Einrichtung für den Erdschlussschutz von Drehstromgeneratoren.

Erdschlussschutz-Einrichtung für Wechselstrom-Generatoren.

Einrichtung zum Abschalten eines Synchrongenerators

Einrichtung zur Erfassung von Erdschlüssen in Drehstromgeneratoren.

Schutzeinrichtung für Wechselstrom.

Schutzeinrichtung für Wechselstrommaschinen.

Anordnung zur Fehlerstrombegrenzung bei elektrischen Wechselstrommaschinen.

Schaltungsanordnung mit Gleichstromgenerator, insbesondere auf Fahrzeugen mit Verbrennungsmotoren.

Schutzvorrichtung für einen Wechselstromgenerator

Einrichtung für den thermischen Rotorschutz einer Synchronmaschine.

Einrichtung zum Abschalten eines Synchrongenerators

Einrichtung für den Erdschlussschutz von Drehstromgeneratoren

Messeinrichtung zur Ermittlung der Wirtschaftlichkeit von Wasserkraftwerken

Generatorschutzeinrichtung zur Erfassung von Windungs- und Erdschlüssen durch eine an die Generatorklemmen angeschlossene Drosselspule.

Schaltungseinrichtung zum Schutze von Mehrphasenwicklungen gegen Erd- und Windungsschlüsse.

Statorerdschluss-Schutzeinrichtung für Generatoren in Blockschaltung

Anordnung zur Unterdrückung des Stosskurzschlussstromes von Wechselstromgeneratoren

Anordnung an einem grossen elektrischen Generator für die Aufrechterhaltung der Kühlwasserzirkulation

Erdschlussschutz für Generatoren

Einrichtung zur Regelung einer einen elektrischen Generator antreibenden Turbine mit einem hydraulisch oder pneumatisch betätigten Drehzahlregler

Erdschlussschutzeinrichtung für Drehstromgeneratoren unter Ausnutzung der im Generator entstehenden dritten Oberwellen

KRAFTSTATION FOR PRODUCING ELECTRICITY WITH A PROTECTION DEVICE AGAINST THE ENTSTABILISIERENDE EFFECT OF A STABILIZER ON TORSION VIBRATIONS.

Apparatus for protecting a generator-turbine unit against overstressing of the shaft when the voltage returns after a network short-circuit

Method for achieving 100% stator earth fault protection for a generator in unit connection

PROTECTION DEVICE AT A TURBO-'S GROUP AGAINST SUBSYNCHRONE RESONANCES.

MECHANISM FOR THE PROTECTION OF POLYPHASE ONES OF ELECTRICAL MACHINES.

Three phase multi-generator ground fault circuit

A ground loop detection and prevention system includes multiple electric power generators driven by one or more rotational power sources. Each of the electrical generators has a set of generator windings with a neutral point. A transformer having a number of primary windings as well as a secondary winding is connected to the neutral points via the primary transformer windings. An interrupter device such as a GFCI is connected across the transformer's secondary winding, such that when a ground loop current occurs in any of the generator windings, the interrupter device detects the loop and stops the operation of the generators.

Independent, redundant overvoltage protection for a generator

A generator controller provides independent and redundant overvoltage protection to an associated generator. The generator controller monitors the generator output at a first point of a regulation and a second point of regulation. A generator control unit (GCU) provides overvoltage protection based on the generator output monitored at the first point of regulation, including at least one of tripping a first generator control relay (GCR) to remove excitation from an exciter winding and tripping a generator line contactor (GLC) to disconnect the generator output from a bus. A overvoltage protection unit (OPU) provides independent, redundant protection based on the generator output monitored at the second point of regulation, including at least one of tripping a second GCR to remove excitation from the exciter winding and tripping the GLC to disconnect the generator output from the bus.

Current generating device

Even when a large-current, high-voltage load is applied, damage is prevented. A current generating device ( 1 ) supplies a current simulating a current flowing when lightning occurs to a test piece ( 9 ) subjected to a lightning resistance test using power supplied from a power supply device ( 2 ). The current generating device ( 1 ) includes electric double-layer capacitors that store and discharge power supplied from the power supply device ( 2 ), a semiconductor switch ( 3 ) that switches between supplying and not supplying the power stored in the electric double-layer capacitors to the test piece ( 9 ), and a protection unit ( 4 ) that is connected between the semiconductor switch ( 3 ) and the test piece ( 9 ) and that cuts the connection between the semiconductor switch ( 3 ) and the test piece ( 9 ) when a current larger than a predetermined value flows through the semiconductor switch ( 3 ).

PROTECTION CIRCUITS AND METHODS FOR ELECTRICAL MACHINES

An assembly includes an electrical machine connected to a power converter by a three-phase circuit having three conductors, e.g. cables. Each conductor is associated with a switching device such as a contactor or the like that connects the conductor to a common conductor or terminal. In the event of a fault current being developed in the circuit or the power converter, the switching devices are operated to close the fault current and connect together the conductors or the three-phase circuit to provide a full three-phase short circuit. 1. An assembly comprising an electrical machine having at least one n-phase stator winding connected to a power converter by an n-phase circuit having n conductors , wherein each conductor is associated with a switching device that connects the conductor to a common conductor such that when the switching devices are operated in the event of a fault current the conductors of the n-phase circuit are connected together to provide a full n-phase short circuit.2. The assembly of claim 1 , wherein the switching devices are contactors.3. The assembly of claim 1 , wherein the electrical machine includes a first n-phase stator winding connected to a power converter by a first n-phase circuit having n conductors and a second n-phase stator winding connected to a power converter by a second n-phase circuit having n conductors.4. The assembly of claim 3 , wherein each conductor of the first n-phase circuit is associated with a switching device that connects the conductor to a common conductor such that when the switching devices are operated in the event of a fault current the conductors of the first n-phase circuit are connected together to provide a full n-phase short circuit claim 3 , and wherein each conductor of the second n-phase circuit is associated with a switching device that connects the conductor to the same common conductor such that when the switching devices are operated in the event of a fault current the conductors of the second ...

TOWER OF A WIND ENERGY INSTALLATION WITH CURRENT CONDUCTION MEANS

A tubular tower (), of a wind energy plant () with a current conduction means system () for transmitting electrical power from a generator on the tower (), to a power module at the base of the tower. The current conduction means system () has three electrical conductors () arranged next to one another. A housing () is connected to the inner tower wall at predetermined distances using connecting devices which have electrical cross-sections conducting with the tower wall. The distances between the connecting devices in the longitudinal extent of the tower () and the cross-sections of the connecting devices between the housing () and the tower wall are dimensioned such that during a fault, the voltage drop between the tower wall and the housing () does not exceed a predetermined touch voltage. 11110. A tower () of a wind energy plant () , the tower comprising:{'b': 25', '35', '11, 'a current conduction means system (, ) for transmitting electrical power from a generator on the tower () to a power module at a base of the tower,'}{'b': 25', '35', '27', '1', '27', '2', '27', '3', '37', '1', '37', '2', '37', '3', '45', '1', '45', '2', '45', '3', '26', '36', '46, 'wherein the current conduction means system (, ) has three electrical conductors (., ., .; ., ., .; ., ., .) arranged next to one another in a housing (, , ),'}{'b': 26', '36', '46', '27', '1', '27', '2', '27', '3', '37', '1', '37', '2', '37', '3', '45', '1', '45', '2', '45', '3', '26', '36', '46, 'wherein using the housing (, , ), one or the protective earthing conductor is the electrical conductors (., ., .; ., ., .; . ., .) arranged in the housing (, , ),'}{'b': 26', '36', '46, 'wherein the housing (, , ) is connected to a wall of the tower at predetermined distances using connecting devices,'}wherein the connecting devices have electrical cross-sections conducting with the tower wall, and{'b': 11', '26', '36', '46', '26', '36', '46, 'wherein distances between the connecting devices in the longitudinal extent ...

Doubly-Fed Generator and Doubly-Fed Electric Machine

The excitation overcurrent detection unit for the doubly-fed electric machine is provided with a function to determine an excitation current magnitude relationship among three phases. The firing pulse is held to on-state or off-state to cause the largest-current phase and the second-largest-current phase to charge the DC capacitor by the operation of diodes. The conduction ratio of the third-largest-current phase or minimum current phase is controlled according to the detected current value to protect against a possible short-circuit across the DC capacitor. When the voltage of the DC capacitor exceeds a preset value, the voltage is suppressed by operating active or passive power devices.

Fault Protection System For A Power System Of Dynamically Positioned Vessel

A fault protection system of a power system of a dynamically positioned vessel is provided. The power system has a power distribution bus having three or more bus subsections, electric connections including bus ties which connect the bus subsections in a ring configuration, and circuit breakers connected between the bus subsections. The fault protection system includes a generator circuit breaker for coupling a generator to a bus subsection, feeder circuit breaker(s) for coupling load(s) to the bus subsection, a first circuit breaker for connecting one end of the bus subsection to a bus tie that provides an electric connection to another bus subsection, the first circuit breaker being a bus tie breaker, a second circuit breaker for coupling another end of the bus subsection to a further bus subsection, protection relays for operating the circuit breakers, and communication links between protection relays that exchange information via said communication links. 1. A fault protection system of a power system of a dynamically positioned vessel , wherein the power system comprises a power distribution bus comprising three or more bus subsections , electric connections including bus ties which connect the bus subsections in a ring configuration and circuit breakers connected between the bus subsections to break the electric connections , wherein for at least one of said bus subsections , the fault protection system comprising:a generator circuit breaker for coupling a generator to the bus subsection,one or more feeder circuit breakers for coupling one or more loads to the bus subsection,a first circuit breaker via which a first end of the bus subsection is connected to a bus tie, said bus tie providing the electric connection to another bus subsection in said ring configuration, the first circuit breaker being a bus tie breaker,a second circuit breaker for coupling a second end of the bus subsection to a further bus subsection in said ring configuration,protection relays ...

Subtransient Current Suppression

A system and method for subtransient current suppression in a power system. A generator is configured to provide an output current to a power distribution system. A current sensor is configured to sense the output current. A switch is configured to direct the output current to ground when the switch is closed. A controller is configured to close the switch for a time delay in response to identifying a level of the output current that is greater than a threshold level and to automatically open the switch in response to identifying an end of the time delay.

Fault Protection for Aircraft Power Systems

A system and method for protecting a power system. A generator is tripped in response to identifying a current on the generator that is greater than a first current threshold for a first time delay. The generator is also tripped in response to identifying the current on the generator that is greater than a second current threshold for a second time delay. The first current threshold is larger than the second current threshold and the first time delay is shorter than the second time delay.

Methods for providing generator stator winding ground fault protection

The present invention includes a method for providing ground fault protection to a generator. The method includes determining the existing state of the generator and second, determining the updated alarm or trip conditions of a relay connected to the generator in view of the existing state of the generator. This includes estimating a ratio of the magnitude of the 3 rd harmonic neutral voltage to the magnitude of the 3 rd harmonic terminal voltage of a generator, along with calculating the residual 3 rd harmonic voltage from the estimated 3 rd harmonic ratio. From this, a comparison is made between the energy of the residual voltage with a fractional energy of the 3 rd harmonic neutral voltage. Based on this comparison, an alarm or trip condition is signaled when the energy of the residual voltage is greater than the fractional energy of the 3 rd harmonic neutral voltage. The invention further includes adaptive relays and systems utilizing the adaptive relays, along with methods of producing power using the adaptive relays.

TURBINE ARRAY AND A METHOD OF CONTROLLING A TURBINE ARRAY DURING A LOSS-OF-GRID EVENT

A turbine array including: a plurality of turbines; an electrical machine connected to each of the turbines and to an electrical grid; wherein at least one of the electrical machines is a motor-generator which can operate in a motor mode or a generator mode, and wherein the other electrical machines are generators; and a controller for detecting a loss-of-grid event; wherein the controller sets the motor-generator to the motor mode when a loss-of-grid event is detected, the motor-generator being driven by the generators and thereby providing a load to the generators. 1. A turbine array comprising:a plurality of turbines;an electrical machine connected to each of the turbines and to an electrical grid; wherein at least one of the electrical machines is a motor-generator which can operate in a motor mode or a generator mode, and wherein the other electrical machines are generators; anda controller for detecting a loss-of-grid event;wherein the controller sets the motor-generator to the motor mode when a loss-of-grid event is detected, the motor-generator being driven by the generators and thereby providing a load to the generators.2. A turbine array as claimed in claim 1 , wherein the motor-generator is a generator which is configured to also operate as a motor.3. A turbine array as claimed in claim 1 , wherein the motor-generator comprises a motor which is activated in the motor mode and a generator which is activated in the generator mode.4. A turbine array as claimed in claim 1 , wherein the controller sets the motor-generator to the motor mode by adjusting a blade pitch of the turbine.5. A turbine array as claimed in claim 1 , wherein the turbines are ganged together in banks claim 1 , each bank containing at least one turbine with a motor-generator and at least one turbine with a generator.6. A turbine array as claimed in claim 5 , wherein each bank comprises a transformer which transforms the output of the bank.7. A turbine array as claimed in claim 6 , further ...

PORTABLE GENERATOR INCLUDING CARBON MONOXIDE DETECTOR

An internal combustion engine-based system including an engine, a shutdown circuit coupled to the engine to shut down the engine, a controller in communication with the shutdown circuit, and a carbon monoxide (CO) sensor in communication with the controller. The controller communicates with the shutdown circuit to shut down the engine at a predetermined CO threshold concentration when the CO sensor provides the controller with signals that are representative of a CO level proximate the engine that indicate a trend of building CO levels over a set time interval. 1. A internal combustion engine-based system comprising:an engine;a shutdown circuit coupled to the engine to shut down the engine;a controller in communication with the shutdown circuit;a carbon monoxide (CO) sensor in communication with the controller, wherein the controller communicates with the shutdown circuit to shut down the engine at a predetermined CO threshold concentration when the CO sensor provides the controller with signals that are representative of a CO level proximate the engine that indicate a trend of building CO levels over a set time interval.2. The internal combustion engine-based system of claim 1 , wherein the shutdown circuit calculates a variance of output CO levels from the CO sensor over the set time interval to determine an environment of the generator.3. The internal combustion engine-based system of claim 2 , wherein the shutdown circuit is structured to determine the predetermined threshold CO concentration for the determined environment.4. The internal combustion engine-based system of claim 3 , wherein the shutdown circuit is further structured to complete a shutdown procedure upon determining the predetermined threshold CO concentration for the determined environment is exceeded.5. The internal combustion engine-based system of claim 4 , wherein the shutdown circuit is communicably and operatively coupled to two opto-isolated outputs claim 4 , each of the two opto-isolated ...

PROTECTION SYSTEM AND METHOD FOR AN ELECTRICAL VARIABLE SPEED DOUBLY FED INDUCTION MACHINE

A protection system for an electrical variable speed doubly fed induction machine having a stator and a rotor, comprising: 1. A protection system for an electrical variable speed doubly fed induction machine (IM) having a stator (S) and a rotor (R) , comprising:{'b': 1', '2', '1', '2', '1', '2, 'instrument transformers (CTR, CTR, CTS, CTS, VTR, VTR) capable of measuring low frequency signals from the rotor and stator, in particular low frequency signals in the range of 0.1 Hz to 6 Hz;'}{'b': 1', '2, 'a protection relay (R, R) which is configured to receive measurement values from the instrument transformers and to sample said measurements values at a constant sampling rate.'}2121212. The protection system of claim 1 , wherein the instrument transformers comprise a first set of current transformers (CTR claim 1 , CTR) for measuring rotor currents claim 1 , a second set of current transformers (CTS claim 1 , CTS) for measuring stator currents claim 1 , and a first set of voltage transformers (VTR claim 1 , VTR) for measuring rotor voltages.3. The protection system of claim 2 , wherein the instrument transformers further comprise a second set of redundant voltage transformers for measuring rotor voltages.431212. The protection system of any one of - claims 1 , wherein the protection relay (R claims 1 , R) is connected to the instrument transformers by means of a merging unit (MU claims 1 , MU) which receives and samples the measurement values from the instrument transformers claims 1 , the sampled measurement values being transmitted to the protection relay which re-samples the measurement values at said constant sampling rate.5. The protection system of claim 4 , wherein the protection relay comprises an IEC 61850-9-2 LE compliant interface module to communicate with the merging unit.65. The protection system of any one of - claims 1 , wherein the protection relay comprises at least one protection module configured to implement a protection algorithm claims 1 , said ...

POWER GENERATOR

A power generator includes: an output information acquisition unit which acquires output information including power-generating component capacity information indicative of a capacity of a power-generating component and output frequency information indicative of an output frequency of the power generator; an ammeter which measures a current flowing through a distribution path; a breaker provided in the distribution path; and a controller. The controller calculates an allowable current based on the output information, and controls the breaker to interrupt the distribution path when a current measured by the ammeter exceeds the allowable current. 1. A power generator outputting electric power generated by a power-generating component , the power generator comprising:an output information acquisition unit which acquires output information including power-generating component capacity information indicative of a capacity of the power-generating component and output frequency information indicative of an output frequency of the power generator;an ammeter which measures a current flowing through a distribution path;a breaker provided in the distribution path; anda controller which calculates an allowable current that is allowed to flow through the distribution path based on the output information, and controls the breaker to interrupt the distribution path when a measured current measured by the ammeter exceeds the allowable current.2. The power generator of claim 1 , whereinthe output information acquisition unit further comprises a frequency measurement unit which acquires the output frequency information through measurement, andthe controller calculates the allowable current of the power generator based on output information including the power-generating component capacity information and the output frequency information obtained through the measurement.3. The power generator of claim 1 , whereinthe output information acquisition unit further comprises a voltage ...

SYSTEMS AND METHODS FOR MONITORING AND PROTECTING AN ELECTRIC POWER GENERATOR

Protection of an electrical generator includes determining a rotor and stator components using rotor and stator electrical signals, calculating a unbalance and/or differential component using the stator and rotor components, and determining a stator or rotor fault based on the unbalance and/or differential component. Further, the faulted phase and/or zone of a stator fault may be determined using the stator positive sequence voltage and negative sequence current. 1. A system for protecting an electric power generator having a stator , a rotor , and a plurality of current transformers (CTs) and transducers , the system comprising:a first input configured to receive an analog signal from a first transducer indicative of a rotor current associated with the rotor of the electric power generator;a second input configured to receive an analog signal from a first CT indicative of a stator current associated with at least one stator phase of the electric power generator; and determine a rotor current value based on the analog signal from the first transducer indicative of the rotor current;', 'determine a stator current value based on the analog signal from the first CT indicative of the stator current;', 'determine a stator-rotor current difference based on a difference of the determined rotor current value and the determined stator current value;', 'determine that the stator-rotor current difference exceeds a threshold fault current value; and', 'report a turn fault., 'a protection module configured to2. A system for protecting an electric power generator , comprising:a first input configured to receive a rotor electrical characteristic associated with a rotor of an electric power generator;a second input configured to receive at least one stator electrical characteristic associated with at least one stator phase of the electric power generator; and determine a rotor electrical value based on the received rotor electrical characteristic;', 'determine a stator electrical ...

Wind turbine fault detection circuit and method

A wind turbine fault detection circuit and method is disclosed herein. In a described embodiment, the wind turbine fault detection circuit comprises a magnetometer in the form of a hall-effect sensor coupled between a power converter and a ground element of the power converter and configured to measure a ground current from the power converter to obtain a real ground current Ig; and a comparator configured to determine presence of a fault based on the real ground current.

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.

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 ...

ENERGY PRODUCTION PLANT, IN PARTICULAR WIND TURBINE

An energy production plant has a drive train including a differential gear () with three drive and power take-off assemblies, a first drive assembly being connected to a drive shaft, a power take-off assembly being connected to a generator () and a second drive assembly being connected to a differential drive assembly (). The differential gear () is a planetary gear. Both an emergency brake () and a service brake () are located in the drive train. In the event of a power failure, grid fault or an emergency shutdown, the service brake () is activated such that the torque acting on the rotor () supplied by the drive train remains substantially constant for a period of at least 0.5 seconds. 124-. (canceled)25613420. Drive train of an energy production plant with an electrical machine ( , ) , characterized in that there are both an emergency brake () and a service brake () in the drive train.26141316142014. Drive train according to with a differential gear () with three drives and outputs claim 25 , a first drive being connected to the drive shaft claim 25 , one output being connected to the generator () and a second drive being connected to a differential drive () claim 25 , and the differential gear () being a planetary gear claim 25 , wherein the service brake () is located in the drive train upstream from the differential gear ().2714320314. Drive train according to claim 25 , wherein in the drive train upstream from the differential gear () claim 25 , there is a main gear () claim 25 , and wherein the service brake () is located between the main gear () and the differential gear ().28141316142014. Drive train according to with a differential gear () with three drives and outputs claim 25 , a first drive being connected to the drive shaft claim 25 , one output being connected to the generator () and a second drive being connected to a differential drive () claim 25 , and the differential gear () being a planetary gear claim 25 , wherein the service brake () is ...

Relay protection method and apparatus against lc parallel circuit detuning faults

A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current of an equivalent capacitor; calculate amplitudes of the current of the equivalent capacitor and a current of a realistic capacitor and calculate an amplitude of the total current flowing through the LC; calculate a current amplitude ratio of the equivalent capacitor to the realistic capacitor; and when the amplitude of the total current flowing through the LC is large enough, send an alarm signal or a trip after a setting time delay if the current ratio exceeds a preset upper and lower limit range. Also provided is a corresponding relay protection device.

OVERVOLTAGE PROTECTION FOR A VARIABLE-SPEED AND CONSTANT-FREQUENCY ELECTRICAL ENERGY GENERATION SYSTEM

Overvoltage protection device for a variable-speed and constant-frequency electrical energy generation system includes at least one DC current generator connected, via a DC current bus to the input terminals of at least one inverter and to at least one regulation module for regulating the output voltage of the at least one inverter. The device includes a circuit including at least one switch in series with a resistor, the circuit being connected between the input terminals of the at least one inverter, at least one measurement sensor for measuring the DC voltage across the input terminals of the at least one inverter, a control circuit connected to the at least one measurement sensor and able to receive a voltage measured by the at least one measurement sensor, compare the measured voltage against a threshold and command the closure of the at least one switch if the measured voltage is greater than the threshold, and command opening thereof if not. 12412. Variable speed constant frequency electrical energy generation system comprising at least one DC generator connected by a DC bus to the input terminals of at least one inverter () and at least one regulation module for regulating output voltage of the at least one inverter , the inverter comprising one or two inverter modules each connected to the input terminals of the inverter , a capacitive mid-point connected to the aircraft neutral being connected to the input terminals of the inverter via two corresponding capacitors (C , C) ,the system further comprises an overvoltage protection device comprising{'b': 16', '263', '263', '264', '264, 'sub': 1', '2', '1', '2, 'a circuit () comprising at least one switch (, ) in series with a resistor (, ), the circuit being connected between the input terminals of the at least one inverter,'}{'b': 261', '1', '24', '261', '2', '24', '263', '263', '24, 'sub': 1', '2', '1', '2, 'a first voltage sensor () to measure the voltage (Vdc) between a first input terminal of the inverter ...

PROTECTION METHOD FOR PROTECTING A GENERATOR OR POWER STATION UNIT AND PROTECTIVE DEVICE FOR CARRYING OUT SUCH A METHOD

A method protects an electrical generator or power station unit connected to a power distribution network or to a power transmission line. A short circuit near the generator in the power distribution network or on the power transmission line is detected, and a short-circuit detection signal is generated, when a set of predetermined trigger conditions is satisfied. The electrical generator is disconnected from the network or line if, after generation of the short-circuit detection signal, the trigger conditions are satisfied at the instant when a predetermined delay time elapses, and have remained satisfied until the predetermined delay time elapses. The delay time is a variable duration which is reestablished regularly or irregularly before it elapses, as a function of the operating profile after the short-circuit occurrence, and the generator is disconnected if the trigger conditions are satisfied at the instant when the delay time elapses. 1. A protection method for protecting an electrical generator or power station unit connected to a power distribution network or to a power transmission line , which comprises the steps of:detecting a short circuit near the electrical generator in the power distribution network or on the power transmission line;generating a short-circuit detection signal when a set of predetermined trigger conditions is satisfied;disconnecting the electrical generator from the power distribution network or the power transmission line if, after generation of the short-circuit detection signal, the set of predetermined trigger conditions are satisfied at an instant when a predetermined delay time elapses, the predetermined delay time being a variable duration which is reestablished regularly or irregularly before it elapses, in dependence on an operating profile after a short-circuit occurrence; anddisconnecting the electrical generator from the power distribution network or the power transmission line if the set of predetermined trigger ...

SYSTEMS AND METHODS FOR CONTROLLING ACCELERATION OF A POWER GENERATOR

An electromagnetic braking system includes an electrically conductive disc coupled to a rotatable shaft of a power generation system for operating in an island mode. The rotatable shaft is operatively coupled between a prime mover and a generator for supplying power to an island grid. The electromagnetic braking system further includes a controller for receiving at least one status or synchronization signal and for generating a control signal based on the at least one signal and an inducting unit for applying an electromagnetic braking force on the electrically conductive disc when commanded by the control signal to regulate a rotational speed of the rotatable shaft. 1. An electromagnetic braking system comprising:an electrically conductive disc coupled to a rotatable shaft of a power generation system for operating in an island mode, wherein the rotatable shaft is operatively coupled between a prime mover and a generator for supplying power to an island grid;a controller for receiving at least one status signal from the power generation system and for generating a control signal based on the at least one status signal; andan inducting unit for applying an electromagnetic braking force on the electrically conductive disc when commanded by the control signal to regulate a rotational speed of the rotatable shaft within a predefined time period.2. The electromagnetic braking system of claim 1 , wherein the inducting unit is configured to induce eddy currents in the electrically conductive disc when commanded by the control signal.3. The electromagnetic braking system of claim 1 , wherein the at least one status signal comprises at least one signal representative of the rotational speed of the rotatable shaft claim 1 , power load at the island grid claim 1 , a current at the generator claim 1 , a voltage at the generator claim 1 , a rotor angle of the generator claim 1 , and an electrical power produced by the generator or combinations thereof.4. The electromagnetic ...

Providing Protection against ARC-Flash in a Genset

An arc flash protection device including a sensor, a timer, and a controller. The sensor is configured to detect a presence of at least one entity or arc flash protection qualifying event in proximity to the generator set. The controller is configured to initiate an arc flash protection regime when the presence of the at least one person or arc flash protection qualifying event is detected in proximity to the generator set. The arc flash protection regime includes shutting down the generator set automatically upon detection of a short circuit.

Fault-tolerant wind energy conversion system

This disclosure is directed to a fault-tolerant energy conversion system. A fault-tolerant doubly-fed induction generator (DFIG) for use with a wind energy conversion system (WECS) consistent with the present disclosure may allow for seamless operation during all kinds of grid faults. In one embodiment, a six-switch grid side converter (GSC) commonly used with such systems may be replaced with nine-switch converter circuitry. With three additional switches, the nine-switch converter can provide two independent three phase outputs. For example, one three-phase output may be coupled to the grid through interfacing inductors to realize normal GSC operation, while the other three-phase output may be coupled to neutral side of the stator windings to provide fault ride-through (FRT) capability to the DFIG. A control algorithm may be employed that both achieves seamless fault ride-through during any kind of grid faults and strictly satisfies grid codes requirements.

The transmission of energy

Apparatus for transmitting energy comprising an electrical machine arranged to convert between electrical and mechanical energy, and comprising a rotor ( 20 ) and control means ( 42, 44, 90 ) arranged to regulate the motion of the rotor to ensure that the power angle of the electrical machine is maintained within a range of a predetermined power angle. A signal generator ( 2, 6 ), such as a synchronous machine and associated flywheel, may generate a reference signal relating to the predetermined power angle and be powered by a frequency regulated electrical supply. The control means ( 42, 44, 90 ) may be a mechanical control linkage or servo control system and may regulate the output of the motion of the rotor in response to a change in its motion which the control means or a dedicated detection device detects. The electrical machine may be an electric motor, an electricity generator, or a machine switchable between motor and generator modes. The apparatus may generate electricity to supply to a power grid and/or store electricity supplied by a power grid, and the electrical machine may be a synchronous machine where the rotor requires regulation to accommodate grid fluctuations such as low voltage events so as to remain synchronised. The apparatus may comprise an energy storage system that supplies and/or receives power from a power grid.

GENERATOR LOSS-OF-FIELD PROTECTION

Protection devices prevent damage to synchronous generators during loss-of-field events. In various embodiments, a first protective element is associated with a first protection zone to protect a generator from a loss-of-field event at full load. A second protective element is associated with a second protection zone to prevent thermal overload during underexcited operation of the generator and to protect from loss-of-filed at light load. A third protective element associated with a third protection zone limits operation of the generator within the generator's specific steady-state stability limits. A fourth protective element is associated with a fourth protection zone to provide an alarm prior to operation of the second protective element. In various embodiments, characteristics and limits of each of the protective elements are defined in the same plane (specifically, the P-Q plane) to simplify settings and allow for visualization of the element characteristics and the generator capability curve at one or more temperatures or cooling capacities. 1. A system to provide loss-of-field protection for a synchronous generator , comprising:a first protective element associated with a first zone of protection in the P-Q plane to prevent damage to the generator from a loss-of-field event at full load;a second protective element associated with a second zone of protection in the P-Q plane;a third protective element associated with a third zone of protection in the P-Q plane to limit operation of the generator to within a steady-state stability limit of the generator; anda fourth protective element associated with a fourth zone of protection in the P-Q plane to provide an alarm prior to implementation of the second protective element.2. The system of claim 1 , wherein the second protective element associated with the second zone of protection in the P-Q plane is configured to trigger thermal overload during underexcited operation of the generator.3. The system of claim 1 , ...

Recurring fault protection for wind power plants

A method for operating a wind turbine generator connected to a power network to account for recurring voltage faults on the power network caused by automatic reclosure of at least one circuit breaker following a short-circuit. The method comprises: identifying a deviation of voltage level of the power network from a normal operational voltage level of the network; determining that the identified deviation fulfils criteria for automatic reclosure; and operating the wind turbine generator in a recurring fault mode if automatic reclosure criteria are fulfilled. When operating the wind turbine generator in recurring fault mode, the method comprises: monitoring the recovery of the voltage level from the deviation; categorising the recovery of the voltage as one of at least a strong recovery or a weak recovery; and implementing a ride-through protocol according to the category of recovery.

Modular electric power generating system with multistage axial flux generator

An example electrical power system includes a DC bus connected to a load, a plurality of generators driven by rotation of a common shaft, and a plurality of power converters. Each power converter includes an active rectifier controller that operates a respective active rectifier to rectify AC from a respective one of the generators to DC on the DC bus. A load sharing controller is operable to provide a respective adjustment signal to each respective power converter that is enabled, the respective adjustment signals based on a difference between an average output current across all of the active rectifiers that are enabled, and a particular output current of the respective power converter. Each active rectifier controller is operable to determine a quadrature current value for its associated generator based on its adjustment signal.

HARDWARE-BASED, REDUNDANT OVERVOLTAGE PROTECTION

A generator system includes a generator and a generator control unit (GCU). The GCU is connected to monitor and regulate the generator output voltage. The GCU includes a protection signal processor that receives monitored generator voltages and executes software to detect an overvoltage condition. The GCU further includes redundant, hardware based overvoltage detection that detects a peak voltage value associated with the monitored generator voltage and includes a fast overvoltage detection circuit that generates a first overvoltage fault signal if the peak voltage value is greater than a first threshold value and includes an inverse overvoltage detection circuit that generates a second overvoltage fault signal if the peak voltage value is greater than a second threshold value for a duration of time that varies with a magnitude of the peak voltage value. 1. A generator control unit (GCU) that provides independent , redundant overvoltage protection for an associated generator , the GCU comprising:a protection signal processor that monitors an output voltage of the generator and executes software to detect overvoltage conditions based on the monitored output of the generator and generates a first overvoltage fault signal in response to a detected overvoltage condition; a peak detector circuit that detects a peak voltage associated with the monitored output voltage;', 'a fast overvoltage detection circuit that compares the peak voltage to a first threshold value and generates a first fault signal in response to the peak voltage exceeding the first threshold value;', 'an inverse overvoltage detection circuit that compares the peak voltage to a second threshold value and generates a second fault signal in response to the peak voltage exceeding the second threshold value for a duration of time;', 'a diode OR circuit that logically combines the first fault signal with the second fault signal to generate a second overvoltage fault signal;, 'a hardware-based overvoltage ...

POWER SYSTEM HAVING SHORT CIRCUIT PROTECTION CONTROLLER

A power system that supplies electrical power to at least one load is disclosed. The power system may include an electrical power generator, current sensors configured to provide current signals representative of currents output from the electrical power generator to the load, and voltage sensors configured to provide voltage signals representative of voltages output from the electrical power generator to the load. The power system may also include a controller configured to receive the current signals and the voltage signals, compare the current signals and the voltage signals to a predetermined map, determine whether a short circuit exists inside the electrical power generator based on the comparison, and send a command to turn off the electrical power generator when the short circuit exists inside the electrical power generator. 1. A power system that supplies electrical power to at least one load , the power system comprising:an electrical power generator;current sensors configured to provide current signals representative of currents output from the electrical power generator to the load;voltage sensors configured to provide voltage signals representative of voltages output from the electrical power generator to the load; and receive the current signals and the voltage signals;', 'compare the current signals and the voltage signals to a predetermined map;', 'determine whether a short circuit exists inside the electrical power generator based on the comparison; and', 'send a command to turn off the electrical power generator when the short circuit exists inside the electrical power generator., 'a controller configured to2. The power system of claim 1 , wherein:the electrical power generator provides the electrical power in three phases with a neutral conductor;the current sensors are configured to provide the current signals representative of the currents output from the electrical power generator to the load on each of the three phases and a neutral current ...

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 GENERATOR CONTROLLER AND METHOD

A wind turbine generator controller is described. The controller comprises switching circuitry, for selectively activating and deactivating one or more transducer circuits, and overcurrent detection circuitry, for detecting an overcurrent state in relation to one or more of the transducer circuits. The switching circuitry is responsive to the detection on an overcurrent state to selectively deactivate one or more of the transducer circuits. 1. A wind turbine generator controller , the controller comprising:switching circuitry, for selectively activating and deactivating one or more transducer circuits; and 'the switching circuitry is responsive to the detection on an overcurrent state to selectively deactivate one or more of the transducer circuits.', 'overcurrent detection circuitry, for detecting an overcurrent state in relation to one or more of the transducer circuits; wherein'}2. A wind turbine generator controller according to claim 1 , wherein the overcurrent detection circuitry detects an overcurrent state based on a stuck-at-low condition detected on a transducer circuit.3. A wind turbine generator controller according to claim 1 , wherein the overcurrent detection circuitry comprises a current measurement device for measuring the current through one or more transducer circuits.4. A wind turbine generator controller according to claim 3 , wherein the switching circuitry selectively activates and deactivates transducer circuits within a group of transducer circuits claim 3 , and wherein the current measurement device measures the current through the transducer circuits in the group and wherein the switching circuitry is responsive to the current through one or more of the transducer circuits in the group being measured as exceeding a threshold level claim 3 , to selectively deactivate one or more of the transducer circuits.5. A wind turbine generator controller according to claim 1 , wherein the switching circuitry receives electrical power for operating the ...

System and Method for Monitoring Ultracapacitors

A method for monitoring a bank of ultracapacitors configured to power an alternating current (AC) pitch motor of a pitch system in a wind turbine is provided. The method includes obtaining, by one or more control devices, data indicative of a voltage associated with the bank of ultracapacitors. The method includes conducting, by the one or more control devices, a test operation of the bank of ultracapacitors at predetermined intervals of time to determine a capacitance associated with the bank of ultracapacitors. The method further includes performing, by the one or more control devices, one or more control actions based, at least in part, on the capacitance or the data indicative of the voltage. 1. A method for monitoring a bank of ultracapacitors configured to power an alternating current (AC) pitch motor of a pitch system in a wind turbine , the ultracapacitors comprising a plurality of segments , each segment of the plurality of segments comprising one or more ultracapacitors , the method comprising:obtaining, by one or more control devices, data indicative of a voltage associated with the ultracapacitors;conducting, by the one or more control devices, a test operation of the ultracapacitors at predetermined intervals of time to determine a capacitance associated with the ultracapacitors; andperforming, by the one or more control devices, one or more control actions based, at least in part, on the capacitance or the data indicative of the voltage.2. The method of claim 1 , wherein the data indicative of the voltage comprises data indicative of a total voltage across the ultracapacitors.3. The method of claim 2 , wherein when the total voltage is less than a first threshold voltage indicative of a voltage needed to operate the AC pitch motor claim 2 , performing one or more control actions based on the total voltage comprises performing at least one of a first control action and a second control action claim 2 , the first control action associated with providing ...

VEHICLE-MOUNTED ELECTRIC ROTATING MACHINE

A vehicle-mounted electric rotating machine includes a field winding wound on a rotor for magnetizing a field pole of the rotor, a stator winding for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole, a power converter for converting the AC voltage to a DC voltage and outputting the DC voltage through a first power supply line connected to an output terminal thereof, and a load dump handling section for performing a load dump protection operation when a voltage of the output terminal of the power converter exceeds a threshold voltage. The load dump handling section is supplied with operating power through a second power supply line provided separately from the first power supply line. 1. A vehicle-mounted electric rotating machine comprising:a field winding wound on a rotor for magnetizing a field pole of the rotor;a stator winding for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole;a power converter for converting the AC voltage to a DC voltage and outputting the DC voltage through a first power supply line connected to an output terminal thereof; anda load dump handling section for performing a load dump protection operation when a voltage of the output terminal of the power converter exceeds a first threshold voltage, the load dump handling section being supplied with operating power through a second power supply line provided separately from the first power supply line.2. The vehicle-mounted electric rotating machine according to claim 1 , further comprising a power supply circuit for supplying the operating power to the load dump handling section claim 1 ,the output terminal of the power converter being connected to a first battery through the first power supply line,the power supply circuit being connected to a second battery provided separately from the first battery through the second power supply line.3. The vehicle-mounted electric rotating machine according ...

GENERATOR STATOR GROUND PROTECTION USING THIRD HARMONIC

Detection of electric power generator stator ground fault conditions and protection of the generator due to such conditions is provided herein. In one embodiment, a generator protection element may calculate generator third harmonic voltage quantities using measurements from the generator terminals, and determine a stator ground fault condition using the calculated generator third harmonic voltage quantity. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition. 1. A system , comprising:a generator configured to generate electrical energy for an electric power delivery system; a generator monitoring subsystem configured to measure terminal voltages and currents of the generator;', 'a stator ground fault detection subsystem in communication with the generator monitoring subsystem and configured to calculate a generator third harmonic voltage using the terminal voltages and currents, calculate a ratio of a generator neutral third harmonic voltage value and the generator third harmonic voltage value, and determine a stator ground fault when the ratio is less than a predetermined threshold;', 'a tripping subsystem configured to issue a trip command based upon satisfaction of the stator ground fault detection; and, 'an intelligent electronic device (IED), comprisingan electrical interrupter configured to selectively interrupt an electrical connection between the generator and the electric power generation and transmission system based on the trip command.2. The system of claim 1 , wherein the stator ground fault detection subsystem is further configured to determine the stator ground fault only when the calculated generator third harmonic voltage exceeds a scaled no-load generator third harmonic voltage.3. The system of claim 1 , wherein the stator ground fault detection subsystem is further configured to determine the stator ground fault only when a disturbance is not detected on the generator.4. The system of claim 1 , ...

MULTIPLE GENERATOR GROUND FAULT DETECTION

Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition. 1. A system , comprising:a generator configured to generate electrical energy for an electric power delivery system, in electrical communication with common bus for providing the electrical energy to the common bus; a generator monitoring subsystem configured to measure a neutral voltage value and a terminal voltage value of the generator;', 'a stator ground fault detection subsystem in communication with the generator monitoring subsystem and configured to determine a stator ground fault using a neutral voltage and terminal voltage value from the generator monitoring subsystem, and to block a determination of the stator ground fault when a factor of the third harmonic voltage from the generator is less than a maximum third harmonic voltage from another generator in electrical communication with the common bus;', 'a tripping subsystem configured to issue a trip command based upon satisfaction of the stator ground fault detection and absence of the block; and,, 'an intelligent electronic device (IED), comprisingan electrical interrupter configured to securely and selectively interrupt an electrical connection between the generator and the electric power generation and transmission system based on the trip command.2. The system of claim 1 , wherein the stator ground fault detection subsystem is further configured to block the determination when a communication channel is faulty.3. The system of claim 1 , wherein the stator ground ...

Methods and Systems for Monitoring Excitation of a Generator Based on a Faulty Status of a Generator Breaker

Systems and methods for monitoring excitation of a generator based on a faulty status of a generator breaker are provided. According to one embodiment, a system may include a controller and a processor communicatively coupled to the controller. The processor may be configured to receive, from a contact associated with a generator breaker, a reported status of the generator breaker, receive operational data associated with one or more parameters of a generator associated with the generator breaker, and correlate the reported status of the generator breaker and the operational data. Based on the correlation, the processor may establish an actual status of the generator breaker, and, based on the actual status, selectively modify a mode of excitation of the generator. 1. A method comprising:receiving, from a contact associated with a generator breaker, a reported status of the generator breaker;receiving operational data associated with one or more parameters of a generator associated with the generator breaker;correlating the reported status of the generator and the operational data;establishing an actual status of the generator breaker based at least in part on the correlation; andbased at least in part on the actual status, selectively modifying a mode of excitation of the generator.2. The method of claim 1 , wherein the mode of excitation is offline when the actual status of the generator breaker is open.3. The method of claim 1 , wherein the mode of excitation is online when the actual status of the generator breaker is closed.4. The method of claim 1 , wherein the one or more parameters include a load current of the generator.5. The method of claim 4 , wherein a substantially zero value of the load current indicates opening of the generator breaker.6. The method of claim 1 , wherein the one or more parameters include one or more voltage values associated with the generator.7. The method of claim 6 , wherein a transient in the one or more voltage values over a ...

INDUCTION GENERATOR SYSTEM WITH A GRID-LOSS RIDE-THROUGH CAPABILITY

A power generation system is provided. The system includes a prime mover for transforming a first energy to a second energy. The system also includes an induction generator operatively coupled to the prime mover and configured to generate electrical power using the second energy. The system further includes an inverter electrically coupled to the induction generator for controlling a terminal voltage of the induction generator during a grid-loss condition. The system also includes a power dissipating device operatively coupled to the inverter for dissipating power generated by the induction generator during the grid-loss condition. 1. A power generation system comprising:a prime mover for transforming a first energy to a second energy;an induction generator operatively coupled to the prime mover and configured to generate electrical power using the second energy;an inverter electrically coupled to the induction generator for controlling a terminal voltage of the induction generator during a grid-loss condition; anda power dissipating device operatively coupled to the inverter for dissipating power generated by the induction generator during the grid-loss condition.2. The system of claim 1 , wherein the prime mover comprises a gas turbine claim 1 , a steam turbine claim 1 , a combination of the gas turbine and the steam turbine claim 1 , or a wind turbine.3. The system of claim 1 , wherein the prime mover comprises an organic rankine cycle based power generation system.4. The system of claim 1 , wherein the inverter comprises a static synchronous compensator.5. The system of claim 1 , wherein the power dissipating device comprises a resistive element.6. The system of claim 1 , further comprising a capacitor bank or a bank of switchable capacitors or a combination thereof operatively coupled to the induction generator.7. The system of claim 6 , wherein the capacitor bank or the bank of switchable capacitors or the combination thereof is configured to provide reactive ...

POWER GENERATION SYSTEM AND METHOD WITH FAULT RIDE THROUGH CAPABILITY

A power generation system includes a generator mechanically coupled to an engine to generate electrical power and a fault ride through system connected between the generator and a power grid. The fault ride through system includes a mechanical switch connected in parallel with a solid state switch and a resistor to absorb power from the generator during a grid fault condition. The mechanical switch and the solid state switch are controlled in coordination with the engine. 1. A power generation system comprising:a generator mechanically coupled to an engine to generate electrical power;a fault ride through system connected between the generator and a power grid, the fault ride through system comprising a mechanical switch connected in parallel with a solid state switch and a resistor to absorb power from the generator during a grid fault condition;wherein the mechanical switch and the solid state switch are controlled in coordination with the engine.2. The system of claim 1 , wherein the engine comprises a gas turbine or a gas engine or a wind turbine.3. The system of further comprising a controller to generate a first control signal to control the mechanical switch claim 1 , a second control signal to control the ignition of the engine and a third control signal to control the solid state switch when the grid fault condition is detected.4. The system of claim 3 , wherein the controller is configured to switch off the mechanical switch when the grid fault is detected and to switch on the mechanical switch if the fault is cleared after a predetermined time.5. The system of claim 4 , wherein the controller is configured to switch off the solid state switch if the fault condition is cleared after the predetermined time.6. The system of claim 4 , wherein the controller is configured to partially or fully switch off the ignition of the engine for a specified time when the fault is detected.7. The system of claim 6 , wherein the controller is configured to keep the ...

Arrangement For Injection-Based Ground Fault Protection Handling

An arrangement for injection-based ground fault protection handling including a number of stator windings of an electric machine that are connected to a neutral point, a first transformer including at least one primary winding connected to at least one measurement point of the stator windings and at least one secondary winding for measuring an electrical quantity of the machine at the measurement point. There is also a second transformer having a primary winding connected between the neutral point and a ground potential and a secondary winding for connection to a signal generation and detection unit in order to inject a signal into the neutral point and receive a response. The impedance of the second transformer is in the range of the impedance of the machine. 1. An arrangement for injection-based ground fault protection handling , the arrangement comprising:a number of stator windings of an electric machine, said stator windings being connected to a neutral point,a first transformer including at least one primary winding connected to at least one point of the stator windings and at least one secondary winding for measuring an electrical quantity of the machine at a measurement point of the first transformer, anda second transformer having a primary winding connected between the neutral point and a ground potential and a secondary winding for connection to a signal generation and detection unit in order to inject a signal into the neutral point and receive a response,wherein the impedance of the second transformer is in the range of the impedance of the machine.2. The arrangement according to claim 1 , wherein the impedance of the second transformer is in a range of 0.25-4 times the impedance of the electric machine.3. The arrangement according to claim 1 , further comprising the signal generation and detecting unit connected to the secondary winding of the second transformer and configured to inject said signal claim 1 , detect the response and determine the ...

Alternator Overvoltage Protection Circuit

Disclosed is an alternator overvoltage protection circuit having a TRIAC and a MOSFET. The TRIAC is electrically connected to the MOSFET and the TRIAC is electrically connected to a magneto. The TRIAC is configured to ground the magneto when triggered by the MOSFET. The MOSFET is electrically connected to an alternator and configured to conduct when the alternator operates in an overvoltage condition. Also disclosed is a method of alternator overvoltage protection for a piece of outdoor power equipment, the method including providing a TRIAC and an alternator rotated by an engine having a magneto, wherein the alternator outputs a voltage when rotated by the engine. The method further includes configuring the TRIAC to ground the magneto when the alternator operates in an overvoltage condition, thereby disabling the magneto, which stops the rotation of the engine and stops the alternator from outputting voltage. 1. An alternator overvoltage protection circuit comprising:a TRIAC and a MOSFET;said TRIAC is electrically connected to said MOSFET, said TRIAC is electrically connected to a magneto, wherein said TRIAC is configured to ground said magneto when triggered by said MOSFET; andsaid MOSFET is electrically connected to an alternator, wherein said MOSFET is configured to conduct when said alternator operates in an overvoltage condition.2. The alternator overvoltage protection circuit of claim 1 , wherein said alternator is connected to and rotated by an engine claim 1 , wherein said magneto is connected to and provides spark to said engine.3. The alternator overvoltage protection circuit of claim 2 , wherein said alternator provides a voltage output; wherein grounding said magneto with said TRIAC disables said magneto and stops said voltage output from said alternator.4. The alternator overvoltage protection circuit of claim 3 , further comprising a transistor; wherein said transistor is electrically connected to said alternator claim 3 , wherein said transistor is ...

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 ...

Synchronous Generator Control, Generator System and Vessel Energy System

An arrangement for controlling a synchronous generator having a stator comprising at least one stator winding and having a rotor with an electromagnet driven by a field current is provided. The rotor is rotatable relative to the stator. The electromagnet is inductively coupled to the at least one stator winding. The arrangement includes a measurement system configured to measure at least one quantity and a controller configured to cause shutting down the field current when the at least one quantity satisfies at least one criterion associated with at least one malfunction.

OVER-VOLTAGE PROTECTION DEVICE OF GENERATOR AND METHOD FOR ENHANCING OVER-VOLTAGE PROTECTION FUNCTION

A method for enhancing an over-voltage protection by an over-voltage protection device for a generator is provided. The device includes a high voltage excitation off (HEO) circuit lowering an over-voltage level by an over-voltage lockout control value and a voltage-dependent Ki-Kp (VoKiKp) circuit decreasing an over-voltage generation time by a voltage difference value of a battery voltage. A generator setting voltage is provided to operate the over-voltage and the voltage difference value of the generator . The over-voltage level is lowered and the over-voltage generation time is minimized, thereby enhancing the over-voltage protection of the regulator of the generator. 1. An over-voltage protection device of a generator , comprising:a high voltage excitation off (HEO) circuit configured to operate an over-voltage generated in the generator; anda voltage-dependent Ki-Kp (VoKiKp) circuit,wherein the HEO circuit configured to decrease an over-voltage level by an over-voltage lockout control value, and the VoKiKp circuit configured to decrease an over-voltage generation time by a voltage difference value.2. The over-voltage protection device of claim 1 , wherein the over-voltage lockout control value is a selected over-voltage lockout setting value.3. The over-voltage protection device of claim 2 , wherein the over-voltage lockout setting value adjusts instantaneous generation to 0% by 0% EXC_duty by excitation off.4. The over-voltage protection device of claim 1 , wherein the voltage difference value is a difference between a battery voltage and a generator setting voltage.5. The over-voltage protection device of claim 4 , wherein the voltage difference value is reflected to electrical load sensitivity representing a change in the generator setting voltage with respect to a time to decrease the over-voltage generation time.6. The over-voltage protection device of claim 5 , wherein the electrical load sensitivity is divided into an insensitive state and a sensitive ...

METHODS FOR PROVIDING GENERATOR STATOR WINDING GROUND FAULT PROTECTION

The present invention includes a method for providing ground fault protection to a generator. The method includes determining the existing state of the generator and second, determining the updated alarm or trip conditions of a relay connected to the generator in view of the existing state of the generator. This includes estimating a ratio of the magnitude of the 3harmonic neutral voltage to the magnitude of the 3harmonic terminal voltage of a generator, along with calculating the residual 3harmonic voltage from the estimated 3harmonic ratio. From this, a comparison is made between the energy of the residual voltage with a fractional energy of the 3harmonic neutral voltage. Based on this comparison, an alarm or trip condition is signaled when the energy of the residual voltage is greater than the fractional energy of the 3harmonic neutral voltage. The invention further includes adaptive relays and systems utilizing the adaptive relays, along with methods of producing power using the adaptive relays. 1. A relay , comprising:a processor capable of being programmed with alarm or trip conditions for a relay; anda program for the processor that establishes the conditions for the relay based on an existing state of a generator or electrical system.2. The relay of wherein the program determines the existing state of the generator or electrical system by estimating a ratio of the magnitude of the 3harmonic neutral voltage to the magnitude of the 3harmonic terminal voltage.3. The relay of claim 1 , wherein the program determines the existing state of the generator or electrical system by estimating a ratio of the phasor of the 3harmonic neutral voltage to the phasor of the 3harmonic terminal voltage.4. The relay of wherein the program calculates a residual 3harmonic voltage.5. The relay of wherein the program establishes modified characteristic of a generator or electrical system relay based on the calculated energy of the residual 3harmonic voltage over at least six data ...

ASSISTANCE DEVICE AND METHOD FOR A POWER GENERATION SYSTEM OF AN AIRCRAFT

The invention relates to an assistance device () for an electrical power generation system () of an aircraft, said system () comprising a generator (), a regulator () and a contactor () comprising contacts and an actuator for opening/closing the contacts which is controlled by said regulator () and arranged between the generator () and a distribution architecture (), the assistance device being characterised in that it is connected to at least one power source () which is separate from the generator () and the regulator (), and in that it comprises means for closing the contactor which are suitable for connecting the power source () to the actuator () of the contactor () in order to provide the current necessary for closing said contactor (). 1171111131415231413121718131418231515. Assistance device () for an electrical power generation system () of an aircraft , said system () comprising a generator () , a regulator () and a contactor () comprising contacts and an actuator () for opening/closing the contacts which is controlled by said regulator () and arranged between the generator () and a distribution architecture () , the assistance device () being characterised in that it is connected to at least one power source () which is separate from the generator () and the regulator () , and in that it comprises means for closing the contactor which are suitable for connecting the power source () to the actuator () of the contactor () in order to provide the current necessary for closing said contactor ().22121212121142315212118abaab. Device according to claim 1 , characterised in that the means for closing the contactor comprise a first electric relay () comprising contacts () and an actuator () for opening/closing the contacts () claim 1 , said contacts () being suitable for connecting the regulator () to the actuator () of the contactor () claim 1 , and the actuator () of said relay () being connected to the power source ().3152222222222182315222214abaab. Device ...

Power generation system and method with fault ride through capability

A power generation system includes a generator mechanically coupled to an engine to generate electrical power and a fault ride through system connected between the generator and a power grid. The fault ride through system includes a mechanical switch connected in parallel with a solid state switch and a controller for controlling the mechanical switch, the solid state switch and ignition of the engine in coordination.

STARTING CIRCUIT FOR GENERATOR-STARTER WITH THREE TERMINALS AND STARTING METHOD

A starting circuit for a generator-starter with three terminals comprises a positive power terminal, a negative power terminal, a positive starting terminal, an armature winding, a commutating winding, a series winding, the series winding, the armature winding and the commutating winding connected in series and a shunt winding. The generator-starter further comprises a voltage regulator having a first terminal and a second terminal, the first terminal connected to a positive terminal of the shunt winding and the second terminal connected to a positive power terminal, so that the shunt winding and the series winding are linked in parallel for a duration of a starting phase. A method for starting such a generator-starter is also provided. 1. A method for starting a generator-starter with three terminals capable of developing a predefined torque during a starting phase for starting , by means of an initial torque , a turbine from a zero speed to a so-called end-of-starting speed , comprising:a positive power terminala negative power terminala positive starting terminalan armature winding, with a commutatorpositive brushes rubbing on the commutator of the armature winding,negative brushes rubbing on the commutator of the armature winding,a commutating winding having two terminals, a first terminal being connected to the negative brushes, a second terminal being connected to the power terminal,a series winding having two terminals, a first terminal being connected to the starting terminal, a second terminal being connected to a point situated between the positive brushes and the power terminal, the series winding, the armature winding and the commutating winding being connected in series,a shunt winding having two terminals, a first terminal being connected to a positive terminal, a second terminal being connected to a point situated between the negative brushes and the first terminal of the commutating winding,a voltage regulator having a first terminal and a second ...

Power Generator Protection Unit

A generator protection unit is provided including a central processing unit including at least one programmable device configured to utilize an Ethernet communication protocol. The central processing unit may be configured to synchronize a first signal generated by a generator electrically coupled to the generator protection unit to a second signal including an electrical power grid parameter of an electrical power grid, the first signal and the second signal having a phase offset. The generator protection unit may also include a plurality of multimeters, each electrically coupled to the electrical power grid and the central processing unit, and at least one display filter electrically coupled to the central processing unit and configured to separate a defined portion of a protection parameter signal, such that a remaining portion of the protection parameter signal is transmitted to the central processing unit. The generator protection unit may further include a user interface coupled to the central processing unit and configured to relay at least the remaining portion of the protection parameter signal to an operator of the generator protection unit.

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. Each dissipating unit includes a first terminal and a second terminal. The first terminal of each dissipating unit is coupled to each output terminal of the generator. Each semiconductor switch includes a first terminal anode, a second terminal and a gate terminal. 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. The trigger circuit is coupled to the gate terminal of the plurality of the semiconductor switches for switching the semi-conductor switches.

SECURE AND DEPENDABLE DIFFERENTIAL PROTECTION FOR ELECTRIC POWER GENERATORS

Secure and dependable differential protection for electric power generators is described herein. An internal fault is declared if the operating current exceeds a function of the restraining current, and the operating current exceeds and adjusted pickup value. The adjusted pickup value is selected as a minimum of a compensated first pickup value and a second pickup value. The compensated first pickup value may be calculated by adding the absolute value of a compensation addend with a first pickup value. The compensation addend may be calculated by filtering, compensating, and summing current values from the neutral side and the power system side of the electrical generator. The absolute value of the compensation addend may be further adjusted using a security compensation factor. 1. A system for providing electrical power , comprising:an electric power generator with neutral-side terminals and power system side terminals, where the power system side terminals are in electrical communication with an electric power delivery system and the neutral-side terminals are in electrical communication with neutral; a first set of current inputs in communication with the neutral-side terminals;', 'a second set of current inputs in communication with the power system side terminals;', 'an analog-to-digital converter in communication with the first and second sets of current inputs for producing current signals therefrom;', 'a differential element module in communication with the analog-to-digital converter, configured to issue an internal fault signal when the operating current exceeds a function of a restraining current value and the operating current exceeds the minimum of a first pickup value and a sum of a second pickup value and a scaled compensation addend comprising a sum of the current signals;', 'a tripping module in communication with the differential element, configured to issue a tripping signal upon receipt of the internal fault signal; and,, 'an intelligent ...

ALTERNATOR OVERVOLTAGE PROTECTION CIRCUIT

Disclosed is an alternator overvoltage protection circuit having a TRIAC and a MOSFET. The TRIAC is electrically connected to the MOSFET and the TRIAC is electrically connected to a magneto. The TRIAC is configured to ground the magneto when triggered by the MOSFET. The MOSFET is electrically connected to an alternator and configured to conduct when the alternator operates in an overvoltage condition. Also disclosed is a method of alternator overvoltage protection for a piece of outdoor power equipment, the method including providing a TRIAC and an alternator rotated by an engine having a magneto, wherein the alternator outputs a voltage when rotated by the engine. The method further includes configuring the TRIAC to ground the magneto when the alternator operates in an overvoltage condition, thereby disabling the magneto, which stops the rotation of the engine and stops the alternator from outputting voltage. 1. A piece of outdoor power equipment comprising:an alternator, an engine, and an alternator overvoltage protection circuit; said alternator is connected to said engine;said alternator overvoltage protection circuit comprising a conditioner section, a trigger section, a drive section, and a disable section;said conditioner section is connected to said alternator rotated by said engine of said piece of outdoor power equipment, and said disable section is electrically connected to a load; said trigger section is located between and electrically connected to said conditioner section and said drive section; said drive section is located between and electrically connected to said trigger section and said disable section;said conditioner section is configured to condition voltage output received from said alternator, and output said conditioned voltage to said trigger section;said trigger section is configured to receive said conditioned voltage from said conditioner section; said trigger section is further configured to output current to said drive section when ...

OUTPUT CABLE MEASUREMENT

A generator system includes a generator controller for monitoring the operation of generator cable. The generator controller is configured to receive a first signal indicative of a generator output and a first connection of a generator cable and a second signal indicative of a second connection of the generator cable. The generator controller is configured to calculate a characteristic value for the generator cable based on the first signal and the second signal and compare the characteristic value for the generator cable to a threshold value. A generator status message or a generator command is generated in response to the comparison. The characteristic value may be resistance of the generator cable. 1. A method for monitoring a generator cable of a generator system including a prime mover and an alternator:receiving a first signal indicative of a generator output and a first connection of a generator cable connected to the alternator;receiving a second signal indicative of a second connection of the generator cable connected to a load supplied by the alternator;calculating a characteristic value for the generator cable based on the first signal and the second signal;performing a comparison of the characteristic value for the generator cable to a threshold value; andgenerating a generator command in response to the comparison.2. The method of claim 1 , wherein the threshold value is based on a previous characteristic value calculation for the generator cable.3. The method of claim 1 , wherein the generator cable is a first generator cable claim 1 , and the threshold value is based on a characteristic value for a second generator cable.4. The method of claim 1 , further comprising:receiving temperature data for the generator cable; andcalculating the threshold value from the temperature data and at least one generator cable property value.5. The method of claim 8 , wherein the generator status message includes a length of the generator cable or a gauge of the ...

Method for operating an at least generator-operable electric motor and means for the implementation thereof

A method for controlling a multi-phase electric machine, whose phase terminals in an active bridge rectifier are respectively connected, via controllable first current valves, to a first DC voltage terminal and via second current valves to a second DC voltage terminal. The method includes switching on the first current valves when an output voltage between the first DC voltage terminal and the second DC voltage terminal has exceeded an upper threshold value at an exceedance point in time, and shutting off the first current valves again only once the output voltage has subsequently fallen below a lower threshold value at a shortfall point in time. The first current valves are shut off again after the shortfall point in time individually, and each only when a respective indication value, which characterizes a current flow in the phase terminal associated with the respective current valve, exhibits a predetermined property.

POWER GENERATION SYSTEM AND METHOD WITH RESISTIVE BRAKING CAPABILITY

A power generation system includes a generator operatively coupled to an engine for generating electrical power and supplying the electrical power to a grid. Further, the power generation system includes a resistive braking system operatively coupled between the generator and the grid. The resistive braking system includes a mechanical switch connected in parallel with a resistor, and a controller for, in response to a grid event, controlling power from the engine and operating the mechanical switch to redirect current between the mechanical switch and the parallel connected resistor. 1. A power generation system comprising:a generator operatively coupled to an engine for generating electrical power and supplying the electrical power to a grid; a mechanical switch connected in parallel with a resistor; and', 'a controller for, in response to a grid event, controlling power from the engine and operating the mechanical switch to redirect current between the mechanical switch and the parallel connected resistor., 'a resistive braking system operatively coupled between the generator and the grid, the resistive braking system comprising2. The system of claim 1 , wherein the controller is configured to send a first control signal to partially or fully switch OFF an ignition of the engine to control power from the engine when the grid event is detected.3. The system of claim 2 , wherein the controller is configured to send a second control signal to open the mechanical switch when the grid event is detected claim 2 , wherein the mechanical switch opens before a first predetermined time.4. The system of claim 3 , wherein the resistor is sufficiently sized for absorbing a certain amount of electrical power and energy from the generator when the mechanical switch is opened.5. The system of claim 3 , wherein the controller is configured to send a third control signal to partially or fully switch ON the ignition of the engine after the first predetermined time.6. The system of ...

PROTECTION METHOD FOR A GENERATOR

A power source includes a generator configured to receive mechanical energy and convert the mechanical energy to an electrical output. The generator includes a rotor and a stator. The stator has a first coil and a second coil. The first coil and the second coil are selectively arranged in a first configuration to provide the electrical output at a first voltage level and in a second configuration to provide the electrical output at a second voltage level. The power source also includes a detection circuit including a sensing relay. The detection circuit is configured to generate an output based on whether the first coil and the second coil are arranged in the first configuration or in the second configuration. 1. A power source comprising:a generator configured to receive mechanical energy and convert the mechanical energy to an electrical output, the generator including a rotor and a stator, the stator having a first coil and a second coil, the first coil and the second coil selectively arranged in a first configuration to provide the electrical output at a first level and in a second configuration to provide the electrical output at a second level; anda detection circuit including a sensing relay, and configured to generate an output based on whether the first coil and the second coil are arranged in the first configuration or in the second configuration.2. The power source of claim 1 , further comprising a protection device coupled to the generator and configured to inhibit the generator from providing the electrical output based on a protection parameter claim 1 , wherein the protection parameter is determined based on the output from the detection circuit.3. The power source of claim 2 , wherein the protection device includes a circuit breaker configured to disconnect the generator from a load to inhibit the generator from providing the electrical output when the protection parameter is exceeded.4. The power source of claim 2 , wherein the protection parameter ...

Bus Recovery after Overload

A set of generators are connected in parallel using a generator bus. At least one of the generators is associated with a controller. The controller detects an overload condition on the generator bus caused by a load and disconnects an initial generator from the generator bus in response to the overload condition. The initial generator continues to run during the overload condition after disconnecting from the generator bus but alternator excitation may be removed from the initial generator. The controller initiates starting one or more additional generator without alternator excitation. The controller also initiates connecting the initial generator and the one or more additional generators to the generator bus connected to the load. Alternator excitation is applied to the initial generator and the one or more additional generator so that adequate power may be applied to the load. 1. A method comprising:detecting an overload condition on a generator bus caused by a load;disconnecting a first generator from the generator bus in response to the overload condition, wherein the first generator runs during the overload condition after disconnecting from the generator bus;starting a second generator without alternator excitation;removing alternator excitation from the first generator;connecting the first generator and the second generator to the generator bus connected to the load; andapplying alternator excitation first generator and the second generator.2. The method of claim 1 , further comprising:determining whether the second generator is available, wherein the second generator is started in response to the second generator being available.3. The method of claim 1 , further comprising:identifying a power requirement of the load.4. The method of claim 3 , further comprising:selecting the second generator based on the power requirement of the load.5. The method of claim 3 , further comprising:comparing a capacity of the first generator to the power requirement of the ...

GENERATOR PROTECTION ELEMENT

The present disclosure is applicable to generators with low motoring power. In one embodiment, a generator protection element may include a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator. The system may also include an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic. The tripping characteristic may be defined by a function having a slope with respect to a real power axis and an imaginary power axis. In some embodiments, the function may be a piecewise function that defines a first linear segment having a first slope and a second linear segment having a second slope. The first slope and the second slope may be equal and opposite. A tripping subsystem may issue a trip command based upon satisfaction of the tripping characteristic. 1. A system , comprising:a steam turbine;a generator coupled to the steam turbine and configured to generate electrical energy from mechanical energy provided by the steam turbine, and the generator in electrical communication with an electric power generation and transmission system; a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator;', 'an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic, the tripping characteristic being defined by a function having a first slope above a real power axis and a second slope below the real power axis, the first slope and the second slope being equal and opposite, and the measured imaginary power output of the generator;', 'a time subsystem configured to determine a length of time during which the tripping characteristic is satisfied; and', 'a tripping subsystem configured to issue a trip command based upon ...

BREAKER DESIGN FOR POWER SYSTEM RESILIENCY

An autonomous breaker can apply a current through a high impedance source to a bus coupled to either end of a breaker in order to measure an impedance of the bus. The status of the bus can be determined from the measurement. Based on the determined status, a fault detection procedure can be selected and implemented to determine if a fault exists on the bus. When the fault detection procedure has been implemented and no fault has been detected, the breaker can close, and thus couple the bus to another bus. 1. A method , comprising:applying a first current to a first bus coupled to a breaker;measuring a first impedance of the first bus after applying the first current to the first bus;determining if a fault exists on the first bus based, at least in part, on the measured first impedance; andcoupling the first bus to a second bus coupled to the breaker when no fault exists on the first bus.2. The method of claim 1 , wherein applying a first current to a first bus comprises applying the first current through a transformer to the first bus.3. The method of claim 1 , further comprising:receiving a command, at a controller, to close the breaker before applying the first current; andinstructing, by a controller, a contactor to close or open after measuring a first impedance.4. The method of claim 1 , wherein determining if a fault exists on the first bus comprises:determining a fault detection procedure to implement based, in part, on the measured first impedance of the first bus; andimplementing the selected fault detection procedure.5. The method of claim 4 , wherein determining a fault detection procedure comprises:processing the measured first impedance;determining the status of the first bus after processing the measured impedance; andselecting the fault detection procedure to implement based, in part, on the determined status of the first bus.6. The method of claim 4 , wherein implementing the selected fault detection procedure comprises:instructing a contactor to ...

ROTATING DIODE ASSEMBLY INCLUDING OVERVOLTAGE PROTECTION CIRCUIT

A brushless wound field synchronous generator configured to generate an output power to drive an electrical load includes a rotating rectifier assembly. The rotating rectifier assembly includes a rotating diode assembly and a field effect transistor (FET) to control voltage across the rotating diode assembly. 1. A brushless wound field synchronous generator configured to generate an output power to drive an electrical load , the wound field synchronous generator comprising:a main generator portion with an armature winding and a field winding rotatable with respect to the armature winding and an exciter portion, the exciter portion including a field winding and an armature winding rotatable with respect to the field winding; anda rotating rectifier assembly disposed between the exciter portion of a rotating armature winding and a main generator portion rotating field winding, the rotating rectifier assembly configured to generate a direct current (DC) voltage to provide the DC voltage to the main generator portion rotating field winding, the rotating rectifier assembly including a rotating diode assembly and a field effect transistor (FET) to control voltage across the rotating diode assembly.2. The brushless wound field synchronous generator of claim 1 , wherein the FET is a silicon carbide (SiC) FET (MOSFET).3. The brushless wound field synchronous generator of claim 2 , wherein the MOSFET is connected in parallel with the rotating diode assembly.4. The brushless wound field synchronous generator of claim 3 , wherein the MOSFET is activated in response to a voltage level across the rotating diode assembly exceeding a predetermined voltage threshold.5. The brushless wound field synchronous generator of claim 4 , wherein the rotating diode assembly includes at least one zener diode in electrical communication with a gate of the MOSFET.6. The brushless wound field synchronous generator of claim 4 , wherein the rotating diode assembly includes a capacitor having a ...

METHOD AND DEVICE FOR SUPPRESSING HIGH-VOLTAGE ELECTRICITY

A device for suppressing high-voltage electricity is connected to a three-phase circuit of an electric generator, including three up arm semiconductor switches, three low arm semiconductor switches, three reverse breakdown diodes respectively connected to the low arm semiconductor switches in parallel, and a control circuit sending PWM signals to turn on and off the low arm semiconductor switches sequentially to evenly share and absorb the energy of surge voltage. Each of the up arm semiconductor switches has a first terminal and a second terminal, wherein the first terminals are electrically connected together, and the second terminals are respectively electrically connected to one of three coils of the three-phase circuit. Each of the low arm semiconductor switches has a first terminal and a second terminal, wherein the first terminals are respectively electrically connected to the second terminals of the up arm semiconductor switches, and the second terminals are electrically connected together. 1. A device for suppressing high-voltage electricity , wherein the device is electrically connected to a three-phase circuit of an electric generator , comprising:three up arm semiconductor switches each having a first terminal and a second terminal, wherein the first terminals of the up arm semiconductor switches are electrically connected together, and the second terminals thereof are electrically connected to coils of the three-phase circuit respectively;three low arm semiconductor switches each having a first terminal and a second terminal, wherein the first terminals of the low arm semiconductor switches are electrically connected to the second terminals of the up arm semiconductor switches respectively, and the second terminals thereof are electrically connected together;three reverse breakdown diodes, each of which has an anode and a cathode, wherein the anodes of the diodes are respectively electrically connected to the second terminals of the low arm ...

Systems and Methods for Isolating Faults in Electrical Power Systems Connected to a Power Grid

A method for isolating faults in an electrical power system connected to a power grid includes dividing the electrical power system into a plurality of power modules each including a plurality of electrical power subsystems and a substation. Each of the electrical power subsystems defines a stator power path and a converter power path for providing power to the power grid and having a partial power transformer. The method also includes coupling each of the power modules to the power grid via a primary electrical line. Further, the method includes monitoring the electrical power system for faults. In response to detecting a fault in one of the power modules, the method includes isolating the fault to the power module experiencing the fault. In contrast, if the fault is detected in the primary electrical line or the power grid, the method includes tripping the electrical power system.

Rectifier and Alternator Using the Same

A rectifier includes a rectification MOSFET that performs rectification, a comparator formed by connecting a drain of the rectification MOSFET to a non-inverting input terminal and a source to an inverting input terminal, and a control circuit that performs an on/off control of the rectification MOSFET using an output of the comparator. The control circuit includes a shut-off MOSFET that disconnects a drain of the rectification MOSFET and a non-inverting input terminal of the comparator from each other, and a shut-off circuit that turns off the shut-off MOSFET to electrically disconnect the drain of the rectification MOSFET and the non-inverting input terminal of the comparator from each other when the drain voltage of the rectification MOSFET is equal to or higher than a predetermined first voltage. 1. A rectifier comprising:a metal oxide semiconductor field effect transistor (MOSFET) configured to perform rectification;a control circuit configured to receive a voltage between a pair of main terminals of the MOSFET and perform an on/off operation of the MOSFET on the basis of the voltage between the pair of main terminals;a power source configured to supply a source voltage to the control circuit; anda hold circuit configured to boost a gate voltage of the MOSFET when an internal trigger voltage of the control circuit is equal to or higher than a first voltage and hold the boosted state for a period independent from a voltage between the pair of main terminals.2. The rectifier according to claim 1 ,wherein the power source is a capacitor.3. The rectifier according to claim 2 ,having only a pair of external terminals which are connected to the pair of main terminals of the MOSFET that performs rectification.4. The rectifier according to claim 2 ,wherein the trigger voltage is a voltage of the capacitor.5. The rectifier according to claim 4 ,wherein the gate voltage of the MOSFET is reduced when the capacitor voltage is equal to or lower than a second voltage which ...

POWER CONTROL SYSTEM AND METHOD OF CONTROLLING THE SAME

A power control system provides an output power control for a generator. The power control system includes a power conversion unit, a sensing unit, a load-dumping unit, and a control unit. The power conversion unit receives and converts a current and a voltage, generated from the generator, to supply a load. The sensing unit receives the current and the voltage to produce a current signal and a voltage signal. The load-dumping unit is connected to the generator and the power conversion unit. The control units receives the current signal and the voltage signal, produces a current control signal to control the power conversion unit, and generates a voltage control signal to control the load-dumping so as to control the output power of the generator. 1. A power control system for providing an output power control for a generator driven by an external force , the power control system comprising:a power conversion unit for receiving a current and a voltage, generated from the generator, and converting the current and the voltage to supply a load;a sensing unit for receiving the current and the voltage to produce a current signal and a voltage signal;a load-dumping unit connected to the generator and the power conversion unit; anda control unit for receiving the current signal and the voltage signal, producing a current control signal to control the power conversion unit, and producing a voltage control signal to control the load-dumping unit so as to control the output power of the generator.2. The power control system of the generator in claim 1 , further comprising:a current driving unit connected between the control unit and the power conversion unit for receiving the current control signal produced from the control unit to drive the power conversion unit; anda voltage driving unit connected between the control unit and the load-dumping unit for receiving the voltage control signal produced from the control unit to drive the load-dumping unit.3. The power control ...

System for controlling electrical power generation

The proposed system for controlling electrical power generation includes power generating units each having an electrical generator parallel-connected to an electric grid via a circuit breaker, programmable control and protection means, and a primary power engine. At least one active loading device is connected to the grid parallel to the generator. The programmable control and protection means include a microprocessor-based excitation system, an automatic excitation regulation controller, and an electrical generator differential protection controller. The controllers are connected to one another and to the microprocessor-based excitation system, the circuit breaker and a plant computer for controlling the power generating units, the plant computer being the end point in a two-way wireless communication link with a dispatch computer for remotely controlling and monitoring the power generating units. 2. The system according to claim 1 , wherein the controller of differential protection is connected with at least one said circuit breaker of the corresponding electric transmission line.3. The system according to claim 1 , wherein the controller of automatic regulation is connected with said microprocessor excitation circuitry.4. The system according to claim 1 , wherein the controller of automatic regulation is connected with said exciter.5. The system according to claim 1 , wherein the controller of automatic regulation is connected with said vacuum circuit breaker.6. The system according to claim 1 , wherein the controller of automatic regulation and the controller of differential protection are connected with each other claim 1 , with said microprocessor excitation circuitry claim 1 , said circuit breakers claim 1 , and said plant computer via wired communication channels.7. The system according to claim 1 , wherein the controller of automatic regulation and the controller of differential protection are connected with each other claim 1 , with said microprocessor ...

PROTECTION OF A PERMANENT MAGNET GENERATOR

The present invention relates to a protection system with a protection relay and at least one measurement sensor to protect a permanent magnet generator having a plurality of stator windings, each of said stator windings having a first end and a second end. If the stator windings are connected in a wye coupling, they are, in a set of three stator windings, commonly coupled in a star point at the first end of the windings, or if the stator windings are connected in a delta coupling, they are, in a set of three stator windings, commonly connected in a ring to each other. In addition, the at least one measurement sensor is arranged for measuring current through at least one of the stator windings at the star point side or within the ring connection and for communicating with the protection relay. The invention also relates to a method of protecting a permanent magnet generator. 1. A protection system for protecting a permanent magnet generator with a plurality of stator windings , the protection system comprising:a protection relay; andat least one measurement sensor, when said stator windings are connected in the wye coupling, the stator windings are, in a set of three stator windings, commonly coupled in a star point at the first end of each of the stator windings, and', 'when said stator windings are connected in the delta coupling, the stator windings are, in a set of three stator windings, commonly connected in a ring to each other, and, 'wherein each of said stator windings has a first end and a second end, and wherein the stator windings are connected in at least one of a wye coupling and a delta couplingwherein the at least one measurement sensor is arranged for measuring a parameter at the first end of at least one of the stator windings and for communicating the measured parameter to the protection relay.2. A protection system according to wherein the at least one measurement sensor is a current sensor for measuring the current in the at least one stator ...

CERAMIC PERMANENT MAGNET PROTECTION

According to some embodiments, system and methods are provided, comprising an electrical installation; one of a permanent magnet motor and a permanent magnet generator; a circuit operative to provide current to operate one of the motor and the generator; one or more sensors coupled to the electrical installation, wherein the one or more sensors are operative to detect an overcurrent in the circuit and to generate an overcurrent signal; one or more inductors; and an inductance module control operative to: receive the overcurrent signal from the one or more sensors; determine how to insert one or more inductors to reduce an amplitude of the overcurrent; activate the one or more inductors based on the determination; and deactivate the one or more inductors when the overcurrent is not detected. Numerous other aspects are provided. 1. A system comprising:an electrical installation;one of a permanent magnet motor and a permanent magnet generator;a circuit operative to provide current to operate one of the motor and the generator;one or more sensors coupled to the electrical installation, wherein the one or more sensors are operative to detect an overcurrent in the circuit and to generate an overcurrent signal;one or more inductors; and receive the overcurrent signal from the one or more sensors;', 'determine how to insert one or more inductors to reduce an amplitude of the overcurrent;', 'activate the one or more inductors based on the determination; and', 'deactivate the one or more inductors when the overcurrent is not detected., 'an inductance module control operative to2. The system of claim 1 , wherein activation of the one or more inductors avoids demagnetization of the at least one permanent magnet motor and permanent magnet generator.3. The system of claim 1 , wherein the one or more inductors are connected in series in the circuit.4. The system of claim 1 , wherein the reduction of the amplitude of the overcurrent by the one or more inductances limits a current ...

A method for controlling a wind power plant and a wind power plant

A method for controlling a wind power plant, the wind power plant including a plant controller for controlling a plurality of wind turbine generators. The method for controlling a wind power plant allows the wind power plant to continue operating through a grid fault in a weak grid environment. In the method, a fault recovery process is carried out with a wind turbine power controller during a wind turbine fault recovery state to determine a grid voltage (VWTG), compare the grid voltage to a predetermined reference voltage (Vref) to obtain a difference value, and determine a current reference (QrefVC) based on the difference value for generating a reactive current (Idref) for regulating the grid voltage to the predetermined reference grid voltage. A corresponding wind power plant is further provided.

Circuit system for coupling an electrical control unit to a voltage supply, and electrical control unit

A device for coupling a control unit with a voltage supply. An electrical connection between the voltage supply and the electrical control unit may be opened/closed with a switching element. An electrical resistor, which allows for a limited current flow from the voltage supply to the electrical control unit even when the switching element is open, is parallel to the switching element. Thus, an electrical energy store, such as a capacitor or a similar device, which is to buffer the input voltage at the electrical control unit, is chargeable even when the switching element is open. This is to avoid adverse effects caused by the charging of a capacitor at the input of the control unit when the switching element is closed.

SYSTEM AND METHOD FOR CONTROLLING A POWER GENERATION SYSTEM BASED ON A DETECTED ISLANDING EVENT

In one aspect, a method for controlling the operation of a power generation system configured to supply power to an electrical grid may generally include detecting an occurrence of an islanding event associated with the power generation system and adjusting a regulator gain applied within a regulator of the power generation system to an islanding gain value in response to the detection of the islanding event, wherein the islanding gain value exceeds a maximum gain value defined for the regulator in the event of an occurrence of any ride-through transient event. In addition, the method may include controlling a power converter of the power generation system based on a control signal generated by the regulator as the power generation system is being isolated from the electrical grid and shutting down the power generation system upon isolation of the power generation system from the electrical grid. 1. A method for controlling the operation of a power generation system configured to supply power to an electrical grid , the method comprising:detecting an occurrence of an islanding event associated with the power generation system;adjusting a regulator gain applied within a regulator of the power generation system to an islanding gain value in response to the detection of the islanding event, wherein the islanding gain value exceeds a maximum gain value defined for the regulator in the event of an occurrence of any ride-through transient event;controlling a power converter of the power generation system based on a control signal generated by the regulator as the power generation system is being isolated from the electrical grid, the control signal being generated within the regulator as a function of the islanding gain value; andshutting down the power generation system upon isolation of the power generation system from the electrical grid.2. The method of claim 1 , wherein the power generation system has a short circuit ratio ranging from about 1.0 to about 3.0.3. The ...

Method and device for detection of sub-synchronous oscillations in a power system

A method for detection of a sub-synchronous oscillation in a power system includes measuring a three-phase measurement signal of an electric system value, analyzing the measurement signal to detect an oscillation component of the measurement signal having an oscillation frequency lower than a system frequency of the power system, deciding whether the detected oscillation component at the oscillation frequency qualifies as a sub-synchronous oscillation, and disconnecting a generator from the power system that might be affected by the sub-synchronous oscillation. To detect sub-synchronous oscillations with low computational effort and good accuracy, an amplitude of each phase of the oscillation component is calculated and compared against a threshold, a sub-synchronous oscillation is detected upon exceeding the threshold during a given time delay, and a fault signal is generated upon detecting a sub-synchronous oscillation. A device having a processing unit is also provided.

ROTARY ELECTRIC MACHINE FOR A VEHICLE

A rotary electric machine for a vehicle is provided. The rotary electric machine includes a power system circuit which has a power element and is grounded via a first ground terminal and a first connecting line and a control system circuit which controls the power system circuit and is grounded via a second ground terminal and a second connecting line. 1. A rotary electric machine for a vehicle , comprising:a power system circuit which has a power element and is grounded via a first ground terminal and a first connecting line; anda control system circuit which controls the power system circuit and is grounded via a second ground terminal and a second connecting line.2. The rotary electric machine according to claim 1 , whereinthe first ground terminal and the second ground terminal are connected via a diode which is disposed so as to interrupt a current flowing from the first ground terminal to the second ground terminal.3. The rotary electric machine according to claim 2 , whereinone end of the diode is connected to the second ground terminal, and the other end of the diode is indirectly connected to the first ground terminal via a frame ground terminal.4. The rotary electric machine according to claim 2 , whereinthe first ground terminal is connected to a vehicle frame, and the second ground terminal is connected to the vehicle frame via the diode.5. The rotary electric machine according to claim 4 , whereinthe diode is connected to the vehicle frame via a rotary electric machine frame and an engine block.6. The rotary electric machine according to claim 1 , whereina current common to the stator windings or a field winding flows through the power element.7. The rotary electric machine according to claim 1 , further comprising:a power converter which converts AC voltage, which is induced in a stator winding included in a stator, into DC voltage, or converts DC voltage, which is applied from an external unit, into AC voltage, to apply the converted voltage to the ...

REACTIVE POWER SUPPORT FROM WIND TURBINE FACILITIES

The present invention relates to a method for operating a wind power facility in order to provide reactive power support to a power grid, the method comprising the step of increasing an amount of reactive power injected into the power grid, decreasing an amount of active power injected into the power grid by a certain amount, and dissipating and/or storing essentially said certain amount of active power in power dissipation and/or power storage means. The wind power facility may comprise a wind turbine or a wind power plant. 1. A method for operating a wind power facility in order to provide reactive power support to a power grid , the method comprising:increasing an amount of reactive power injected into the power grid,decreasing an amount of active power injected into the power grid by a certain amount, anddissipating and/or storing essentially said certain amount of active power in power dissipation and/or power storage means.2. A method according to claim 1 , wherein the sum of the amount of active power injected into the power grid and the amount of active power dissipated and/or stored is essentially constant over a given time period.3. A method according to claim 1 , wherein the wind power facility comprises a wind turbine or a wind power plant.4. A method according to claim 1 , wherein increasing the reactive power and decreasing the active power is performed essentially simultaneously.5. A method according to claim 1 , wherein the power dissipation means comprises a DC chopper comprising a number of dump load resistors.6. A method according to claim 1 , wherein the power storage means comprises a number of batteries and/or capacitors.7. A method according to claim 1 , further comprising pitching wind turbine rotor blades out of the wind after the given delay period claim 1 , said delay period being 0-2 seconds.8. A method according to claim 7 , wherein the dissipated and/or stored amount of active power is decreased after the given delay period claim 7 , ...

APPARATUS AND METHOD FOR DETECTING CURRENT OVERLOAD AND LEAKAGE IN A TRANSPORT REFRIGERATION UNIT

A system and method for detecting current overload and leakage in a transport refrigeration unit. The method comprises measuring, by a microcontroller of an active fault detection circuit, a line current for each of one or more phases supplying power to a GP load of a refrigerant vapor compression system of the transport refrigeration unit; measuring, by the microcontroller, a voltage received by the active fault detection circuit from a battery of the transport refrigeration unit and transmitted via a conductor of the active fault detection circuit to a microprocessor of the refrigerant vapor compression system; controlling, by the microcontroller, a switch along the conductor of the active fault detection circuit to control transmission of the voltage, via the conductor to the microprocessor, Controlling the switch comprises (i) closing the switch upon a determination that the voltage level is greater than or equal to an operational threshold voltage level, (ii) closing the switch upon a determination that the voltage level is less than the operational threshold voltage level, and (iii) opening the switch upon a determination that any of the one or more line currents exceeds a threshold. Other embodiments are described herein. 1. A method for active detection of current overload and leakage by an overload and active fault detection circuit of a transport refrigeration unit , the method comprising:measuring, by a microcontroller of the active fault detection circuit, a line current for each of one or more phases output by a generator of the transport refrigeration unit supplying power to a load of a refrigerant vapor compression system of the transport refrigeration unit;measuring, by the microcontroller, a voltage received by the active fault detection circuit from a battery of the transport refrigeration unit and transmitted via a conductor of the active fault detection circuit to a microprocessor of the refrigerant vapor compression system;controlling, by the ...

SYSTEM AND METHOD FOR DETECTING ISLANDING OF ELECTRICAL MACHINES AND PROTECTING SAME

In one aspect, a method for protecting one or more electrical machines during an islanding event is provided. The method includes connecting one or more electrical machines to an alternating current (AC) electric power system, wherein the AC electric power system is configured to transmit at least one phase of electrical power to the one or more electrical machines or to receive at least on phase of electrical power from the one or more electrical machines; electrically coupling at least a portion of a control system to at least a portion of the AC electric power system; coupling at least a portion of the control system in electronic data communication with at least a portion of the one or more electrical machines; and detecting an islanding of the one or more electrical machines based on one or more conditions monitored by the control system. 1. A method of protecting one or more electrical machines during an islanding event , said method comprising:(a) receiving a first indicator of an islanding of one or more electrical machines;(b) determining, by a computing device, whether the received first indicator is determinative of islanding of the one or more electrical machines;(c) if the computing device determines that the received first indicator is determinative of islanding of the one or more electrical machines, then sending one or more signals by the computing device to protect the one or more electrical machines;(d) if the computing device determines that the received first indicator is not determinative of islanding of the one or more electrical machines, then receiving one or more additional condition indicators;(e) determining, by the computing device, whether the one or more additional condition indicators are determinative of islanding of the one or more electrical machines;(f) if the computing device determines that the one or more additional condition indicators are determinative of islanding of the one or more electrical machines, then sending the one ...

OVER-VOLTAGE PREVENTION APPARATUS AND METHOD OF DISTRIBUTION LINE CONNECTED WITH DISTRIBUTED GENERATOR

The present disclosure relates to an over-voltage prevention apparatus and method of a distribution line connected with a distributed generator, which sets a range of a dispatched voltage based on a current voltage of a Pole Mounted Automatic Voltage Regulator (PVR) and a voltage at a connection point of a distributed generator to control so that the dispatched voltage is output within the corresponding range. 1. An over-voltage prevention apparatus for controlling a dispatched voltage of a distribution line connected with one or more distributed generators by using a PVR , the over-voltage prevention apparatus comprising:a measurement unit for measuring voltages, currents, and phases at an installation point of the PVR and connection points of the one or more distributed generators;a flow direction determination unit for determining a flow direction based on the voltage, current, and phase at the installation point of the PVR measured by the measurement unit; anda control unit for regulating the dispatched voltage according to the current at the installation point of the PVR, if the flow direction is a forward direction, and regulating the dispatched voltage to satisfy ranges of a first admissible voltage and a second admissible voltage by calculating the first admissible voltage and the second admissible voltage based on the voltages at the connection points of the one or more distributed generators and the voltage at the installation point of the PVR, if the flow direction is a backward direction, as a result of determining the flow direction in the flow direction determination unit.2. The over-voltage prevention apparatus of claim 1 ,wherein the flow direction determination unit determines a direction in which the flow is maintained within a certain time or more as the flow direction.3. The over-voltage prevention apparatus of claim 1 ,wherein the control unit regulates so that the dispatched voltage is increased if the current at the installation point of the ...

PORTABLE GENERATOR INCLUDING CARBON MONOXIDE DETECTOR

A generator includes an engine, an air-fuel mixing device coupled to the engine, where the air-fuel mixing device is structured to receive air from an air intake and combine the air with fuel to create an air/fuel mixture, an exhaust outlet positioned on a first side of the generator and coupled to the engine, wherein the exhaust outlet is structured to emit exhaust gases from the engine, and a carbon monoxide (CO) sensor positioned on a second side of the generator opposite the exhaust outlet, where the CO sensor is structured to detect CO concentration near the generator. 1. A generator comprising:an engine;an air-fuel mixing device coupled to the engine, wherein the air-fuel mixing device is structured to receive air from an air intake and combine the air with fuel to create an air/fuel mixture;an exhaust outlet positioned on a first side of the generator and coupled to the engine, wherein the exhaust outlet is structured to emit exhaust gases from the engine; anda carbon monoxide (CO) sensor positioned on a second side of the generator opposite the exhaust outlet;wherein the CO sensor is structured to detect CO concentration near the generator.2. The generator of claim 1 , wherein the CO sensor is positioned at a lower elevation on the generator than the exhaust outlet.3. The generator of claim 1 , further comprising:a CO sensor controller structured to control operation of the CO sensor, wherein the CO sensor controller comprises:a shutdown circuit structured to determine an environment of the generator and determine a predetermined threshold CO concentration for the determined environment.4. The generator of claim 3 , wherein the shutdown circuit is further structured to complete a shutdown procedure upon determining the predetermined threshold CO concentration for the determined environment is exceeded.5. The generator of claim 4 , wherein the shutdown circuit is communicably and operatively coupled to two opto-isolated outputs claim 4 , each of the two opto- ...

ARC FAULT INDUCED DIFFERENTIAL PROTECTION ISOLATION

A method includes detecting an initial fault in a system and opening a contactor to isolate a load bus from the system for a window of time. During the window of time, the method includes detecting whether current flows from a generator of the system. If current flows from the generator of the system during the window of time, the method includes isolating the load bus from the generator. If current does not flow from the generator to the system during the window of time, the method includes isolating the load bus from all sources including the generator. 1. A method comprising:detecting an initial fault in a system;opening a contactor to isolate a load bus from the system for a window of time;during the window of time, detecting whether current flows from a generator of the system; andif current flows from the generator of the system during the window of time, isolating the load bus from the generator; andif current does not flow from the generator to the system during the window of time, isolating the load bus from all sources including the generator.2. The method as recited in claim 1 , wherein the initial fault is an arc fault in a generator feeder or a panel arc fault.3. The method as recited in claim 1 , wherein the contactor connects between a generator feeder line and a load bus.4. The method as recited in claim 1 , wherein if current flows from the generator of the system during the window of time claim 1 , isolating the load bus from the generator and connecting the load bus to a power source other than the generator.5. The method as recited in claim 1 , further comprising keeping the generator online and running during the window of time claim 1 , and deactivating the generator if current flows from the generator of the system during the window of time.6. The method as recited in claim 1 , further comprising re-connecting the generator to the load bus if the initial fault clears during the window of time.7. A system comprising:a generator;a generator feed ...

CIRCUIT AND METHOD FOR FREQUENCY SYNTHESIS FOR SIGNAL DETECTION IN AUTOMATIC VOLTAGE REGULATION FOR SYNCHRONOUS GENERATORS

Automatic voltage regulation is shown involving full wave rectifying a power signal and generating a reference corresponding to an operating voltage level, line sampling the power signal and comparing it to the reference to generate a line sync signal synchronized to the power signal. Producing 90° out of phase signals synchronized to the line sync signal with a PLL locked onto the line sync signal that outputs a phase error signal. Generating a quadrature signal from the phase signals. Sampling the peaks of the rectified power signal using the quadrature signal to produce a control signal. Subtracting the error signal and damping signal from the reference to produce a duty cycle modulation signal. The duty cycle modulation signal controls a duty cycle of a field voltage control signal that oscillates at a predetermined frequency. The field voltage control signal is low-pass filtered to produce the damping signal. The control signal is utilized to detect a short circuit condition and engage a circuit protection device. The reference voltage may also be obtained from another generator so that the output voltage is controlled to operate in sync with the other generator. 1. An automatic voltage regulator circuit , the circuit comprising:a direct current power supply circuit configured to receive a power signal to be regulated and, responsive thereto, full wave rectify the received power signal and generate a DC reference voltage signal, where a voltage level of the DC reference voltage corresponds to a desired steady state operating voltage level for the power signal;a line sampling circuit configured to receive the power signal and compare the power signal to the DC reference voltage signal in order to generate a line sync signal synchronized to an oscillation frequency of the power signal;a quadrature signal generator circuit configured to receive the line sync signal and produce first and second phase signals that are synchronized to the line sync signal and 90° out ...

FAULT CONTROL SYSTEM IN MACHINE

A fault control system in a machine is provided. The machine may include a double wound AC alternator that includes a first neutral and a second neutral. The fault control system includes a phase fault control circuit connected across the first neutral and the second neutral of the double wound AC alternator. The phase fault control circuit is adapted to generate a control signal for a control system upon detecting a voltage difference between the first neutral and the second neutral. The fault control system includes a voltage divider circuit having a pair of current limiting resistors is connected parallel across the first neutral and the second neutral. The fault control system also includes a ground fault detection circuit to detect a ground fault. The voltage divider circuit precludes the ground current flowing to the phase fault control circuit when a voltage difference between the current limiting resistors is zero. 1a phase fault control circuit connected across the first neutral and the second neutral of the double wound AC alternator, the phase fault control circuit adapted to generate a control signal for a control system upon detecting a voltage difference between the first neutral and the second neutral of the double wound AC alternator;a voltage divider circuit having a pair of current limiting resistors, the pair of current limiting resistors being connected parallel across the first neutral and the second neutral of the double wound AC alternator; anda ground fault detection circuit adapted to detect a ground fault by establishing a closed path for a ground current flowing from a current carrying conductor of an electrical device to one of the first neutral and the second neutral of the double wound AC alternator through the voltage divider circuit, wherein the voltage divider circuit precludes the ground current flowing to the phase fault control circuit when a voltage difference between the current limiting resistors of the voltage divider circuit ...

PASSIVE FAULT CURRENT LIMITER FOR WIND POWER APPLICATIONS

A device for limiting a fault current for a generator, in particular of a wind turbine is provided. A first frame is made of a ferromagnetic material, wherein the first frame comprises a first frame section and a further first frame section, wherein a first gap is formed between the first frame section and the further first frame section. A first coil is wound around the first frame section, wherein the first coil is connectable to a first stator winding of a stator of the generator. A further first coil is wound around the further first frame section, wherein the further first coil is connectable to an electronic device. A first permanent magnet element is arranged inside the first gap. The first frame section and the further first frame section are formed with respect to each other such that an electromagnetic interaction between the first coil and the first permanent magnet element and the further first coil and the first permanent magnet element is provided. 1. A device for limiting a fault current for a generator , in particular of a wind turbine , the device comprisinga first frame made of a ferromagnetic material, wherein the first frame comprises a first frame section and a further first frame section, wherein a first gap is formed between the first frame section and the further first frame section,a first coil wound around the first frame section,a further first coil wound around the further first frame section, anda first permanent magnet element which is arranged inside the first gap, wherein the first frame section and the further first frame section are formed with respect to each other such that an electromagnetic interaction between the first coil and the first permanent magnet element and the further first coil first permanent magnet element is provided, wherein the first permanent magnet element is in magnetic interaction with the first frame such thata first magnetic field circulating through the first frame section in a first circulating direction ...

Protecting a Permanent Magnet Generator

A method for protecting a permanent magnet generator of a wind turbine with a multiphase generator, and n number of isolated converters, the multiphase generator including a rotor carrying permanent magnets and n number of independent multiphase sub-stators comprising a plurality of windings, each converter being connected to an independent multiphase sub-stator and configured to control the plurality of windings of the multiphase sub-stator comprises determining an asymmetrical short circuit current in one of the sub-stators, which generates a first oscillating torque, disconnecting the converter linked to the sub-stator with an asymmetrically short circuited group of windings, and injecting an asymmetrical current with the remaining connected converters, wherein said injected asymmetrical current generates a second oscillating torque that is substantially opposed in phase to the first oscillating torque so that the first oscillating torque is at least partly compensated is disclosed. Permanent magnet generators are also disclosed. 114-. (canceled)15. A method for protecting a permanent magnet generator with a multiphase generator , and n-number of electrically isolated converters , wherein the multiphase generator has a rotor carrying permanent magnets and n-number of independent multiphase sub-stators each having a plurality of windings , and each converter is connected to an independent multiphase sub-stator and configured to control the plurality of windings of the multiphase sub-stator ,the method comprising:determining an asymmetrical short circuit current in one of the sub-stators that results in generation of a first oscillating torque;disconnecting the converter linked to the sub-stator with an asymmetrically short circuited group of windings; andinjecting an asymmetrical current with the remaining connected converters, wherein the injected asymmetrical current generates a second oscillating torque that is opposed in phase to the first oscillating torque ...

System and method for controlling wind power generation systems

An electrical system for controlling a wind turbine is provided. The electrical system includes a first resistive element, a storage element and a controller. The first resistive element and the storage element are coupled to a DC link of the wind turbine. The controller is used for switching between the first resistive element and the storage element in response to a grid side fault condition to minimize mechanical loads induced by the grid side fault condition.

CONTROL SYSTEM, CONTROLLER, AND CONTROL METHOD FOR WOUND INDUCTION MACHINE

According to one embodiment, a control system includes a chopper, a short-circuit unit, a voltage detector circuit, and a controller. The chopper reduces a direct current voltage between a converter connected to a stator in a wound induction machine and an inverter connected to a rotor in the wound induction machine. The short-circuit unit shorts a wire used for connection between the rotor and the inverter and the voltage detector circuit is to detect the direct current voltage. The controller causes driving the chopper and, at the same time, outputting from the inverter an alternating current over which a direct current component is superimposed when a voltage value exceeds a first predetermined value, and causes driving the short-circuit unit and, at the same time, halting the inverter when the voltage value exceeds a second predetermined value. 1. A control system of a wound induction machine , comprising:a chopper to reduce a direct current voltage between a converter connected to a stator in the wound induction machine and an inverter connected to a rotor in the wound induction machine;a short-circuit unit to short a wire used for connection between the rotor and the inverter;a voltage detector circuit to detect the direct current voltage; anda controller to cause driving the chopper and, at the same time, outputting from the inverter an alternating current superimposed over a direct current component when a voltage value input from the voltage detector circuit exceeds a first predetermined value, and to cause driving the short-circuit unit and, at the same time, halting the inverter when the voltage value exceeds a second predetermined value higher than the first predetermined value.2. The control system according to claim 1 , further comprising a current sensor to detect line current flowing through the wire claim 1 , whereinwhen one circuit breaker is connected between the stator and an electric power system, the controller causes the wound induction ...

OVERVOLTAGE PROTECTION FOR A MOTOR VEHICLE ELECTRICAL SYSTEM IN THE EVENT OF LOAD SHEDDING

A method for operating a motor vehicle electrical system which includes an electric machine, and an active bridge rectifier connected to the electric machine via phase connections. After the bridge rectifier has been operated at least once in a short circuit operating mode, a determination is made, based on at least one feature of a signal which characterizes a voltage that drops between the direct voltage terminals of the bridge rectifier, whether the signal has exceeded the upper threshold value due to a cable break at at least one of the direct voltage terminals. If so, the bridge rectifier is subsequently operated in the short circuit operating mode for an extended period of time, and/or a control signal having a second switching time greater than that in the first method phase is used for controlling the active switching elements. 111-. (canceled)12. A method for operating a motor vehicle electrical system which includes an electric machine which is operable in a generator mode , and an active bridge rectifier which is connected to the electric machine via phase connections and which is operable in a rectifier operating mode and a short circuit operating mode , the method comprising:in the rectifier operating mode, converting phase voltages present at the phase connections into an output voltage, outputting the output voltage at direct voltage terminals of the bridge rectifier by controlling active switching elements of the bridge rectifier;in the short circuit operating mode, short-circuiting the phase connections by controlling the active switching elements so that no output voltage is output by the bridge rectifier at the direct voltage terminals of the bridge rectifier, the short circuit operating mode being initiated as soon as a signal which characterizes a voltage that drops between the direct voltage terminals of the bridge rectifier exceeds an upper threshold value;in a first method phase, discontinuing the short circuit operating mode as soon as the ...

FAST RUN-BACK CONTROL INCLUDING PLANT LOSSES

The present invention relates to a method for operating a wind power plant, with at least one wind turbine generator and a power plant controller, the method includes the steps of receiving a request to reduce active power output from the wind power plant, dispatching a reference set point to the at least one wind turbine generator to lower a voltage level of the least one wind turbine generator, and the at least one wind turbine generator controls the voltage level of the least one wind turbine generator, to a new lower set point. The present invention also relates to a wind power plant where the method is implemented. 1. Method for operating a wind power plant , with at least one wind turbine generator and a power plant controller , the method comprises:receiving a request to reduce active power output from the wind power plant,dispatching a reference set point to the at least one wind turbine generator to lower a voltage level of the least one wind turbine generator,the at least one wind turbine generator controls said voltage level of the least one wind turbine generator, to a new lower set point, the new lower set point of said voltage level causing an increase of active power losses in the wind power plant to thereby reduce active power output from the wind power plant.2. Method for operating a wind power plant according to wherein the request to reduce power is due to a run back event.3. Method for operating a wind power plant according to claim 1 , wherein said dispatched reference set point is a set point of reactive power claim 1 , Qref.4. Method for operating a wind power plant according to claim 1 , wherein said reference set point is a set point of the voltage level of the at least one wind turbine generator.5. Method for operating a wind power plant according to claim 1 , wherein the reference set point is calculated based on an impedance at a connection point of the at least one wind turbine generator.6. Method for operating a wind power plant ...

WIND TURBINE WITH FEED LINE

A wind turbine includes a wind rotor, a generator, and a converter. The generated electric power is fed from the converter by means of a feed to a turbine transformer for delivery to a grid. The feed is designed as a double branch including a power-branched power circuit breaker unit having a first feed line and a second feed line connected in parallel, wherein a separate low-voltage winding of the turbine transformer and a separate power circuit breaker at the connector of the converter is associated with each feed line. 1. A wind turbine comprising a wind rotor , a generator , and a converter , the wind turbine being configured for generating electric power for delivery to a grid via a feed and a turbine transformer , wherein the feed is configured as a double branch comprising a power-branched power circuit breaker unit that has a first feed line and a second feed line connected in parallel , wherein a separate low-voltage winding of the turbine transformer and a separate power circuit breaker are associated with each the first and second feed lines.2. The wind turbine of claim 1 , wherein a third feed line is arranged in parallel with the first feed line and the second feed line.3. The wind turbine of claim 1 , wherein the respective low-voltage windings act on a common medium-voltage winding of the turbine transformer.4. The wind turbine of claim 1 , wherein each of the feed lines comprises a separate transformer having a separate medium-voltage winding.5. The wind turbine of claim 1 , wherein a separate converter of the wind turbine is provided for each feed line.6. The wind turbine of claim 1 , wherein no cross-connection exists between the first and second feed lines.7. The wind turbine of claim 1 , wherein the respective transformers for the feed lines are sized equally.8. The wind turbine of claim 7 , wherein a sizing deviation between the respective transformers is less than 20%.9. The wind turbine of claim 7 , wherein a sizing deviation between the ...

DEVICE AND METHOD FOR INCREASING FAULT CLEARING TIME

A device for increasing fault clearing time is provided having a component part designed to identify a short circuit event and load resistors connectable in the event of a fault such that the turbine power transmitted to the shaft is electrically absorbed by the generator and converted into heat until the grid comes back online. 1. An apparatus for extending the fault clearing time comprisingan electrical generator andelectrical loads anda component part designed to identify a short circuit event,wherein the apparatus is designed in such a way that, in the event of a short circuit, the electrical loads are connected to the electrical generator.2. The apparatus as claimed in claim 1 ,wherein the electrical loads are in the form of load resistors.3. The apparatus as claimed in claim 1 , further comprisinga transformer, which is connected to the electrical generator,wherein the electrical loads are connected in parallel with the transformer.4. The apparatus as claimed in claim 1 , further comprisinga transformer, which is connected to the electrical generator,wherein the electrical loads are arranged in series with the short circuit path at the transformer neutral point on the high voltage side.5. The apparatus as claimed in claim 4 ,wherein the electrical loads are formed with switches arranged in parallel and the switches are opened in the event of a short circuit.6. The apparatus as claimed in claim 1 ,wherein the electrical generator has three phases.7. A method for extending the fault clearing time in the case of an electrical generator claim 1 , which is connected to an electrical consumer grid claim 1 , the method comprisingin the event of a short circuit, connecting additional electrical loads to the electrical generator.8. The method as claimed in claim 7 ,wherein the electrical loads are in the form of load resistors.9. The method as claimed in claim 7 ,wherein the electrical loads are in parallel with a transformer, which is connected to the electrical ...

Wind Turbine and Method for Controlling the Electrical Moment of a Wind Turbine by Closed-Loop Control in the Event of a Grid Fault

The invention relates to a method for controlling the electrical moment of a wind turbine by closed-loop control in the event of a grid fault. A fall in voltage that is outside the limits of normal operation is discovered. A moment closed-loop controller which determines a target value for the electrical moment of the wind turbine, is operated. A moment ramp is initialized. The target value of the moment closed-loop controller is compared with the moment ramp and the lesser value is selected as a moment setpoint value. The electrical moment of the wind turbine is set on the basis of the moment setpoint value. The invention additionally relates to a wind turbine suitable for implementing the method. The invention makes it possible, on the one hand, to achieve a rapid restoration of the power after the end of the grid fault, while, on the other hand, the loads for the wind turbine are kept within limits.

AUTOMATIC SWITCHING INTERFACE BOX FOR GENERATOR

An automatic switching interface box for generators in residential dwellings and small commercial applications provides a breaker box transfer switch for generators powering one or more electrical loads. In power blackout situations, the breaker box transfer switch uses a power control relay to keep the load power on, which eliminates the need for a hot generator plug, because the plug in box is not powered. The generator power output cord is plugged onto the male plug of the interface box, or hard wired thereto. If the auxiliary generator had been started and is at rated voltage, the load is immediately and automatically switched from the utility connection to the generator as electrical source. The relay keeps the prongs of the male plug safely unpowered until the generator is attached since the relay coil is powered by the generator output and the plug is connected to the normally open contacts. 1. An automatic switching interface box for auxiliary generators in residential dwellings and small commercial applications comprising:said interface box connected between a utility source of electrical power and a load;said interface box containing a circuit breaker reset switch providing overload protection during periods of generator use;said interface box containing a power relay having an electromagnetic coil and a DPDT contact configuration switch controlled by said coil;said contacts switch having a normally closed first position delivering electrical power from said utility source to said load and a normally open second position when said coil is not energized;said interface box having a housing containing a male plug with electrical connection to contacts of said second position of said contact configuration switch in said power relay;said auxiliary generator having a generator power output cord terminating in a female plug being mated with connected onto the male plug of said interface box;wherein when said male and female plugs are engaged and said auxiliary ...

Differential Protection Method And Differential Protection Device For Performing A Differential Protection Method

A differential protection method for generating a fault signal includes measuring current measurements at least at two different measuring points of a multiphase transformer for each phase. The current measurements for each phase are used to form differential current values and stabilization values. The fault signal is generated if it is determined during a trigger region check that a measurement pair of at least one of the phases, being formed by using one of the differential current values and the associated stabilization value in each case, is in a predefined trigger region. In order to be able to selectively and reliably distinguish an external fault from an internal fault, the transformer has a grounded star point and a zero system current flowing through the star point is used to form the stabilization values. A corresponding differential protection device is provided for performing the differential protection method.

ELECTRICAL SYSTEM PROTECTION STRATEGY USING SLIP FREQUENCY CALCULATION

An electrical system includes a plurality of synchronous electrical machines, and an electronic control unit structured to controllably trip a circuit breaking mechanism such as a relay coupling together the electrical machines. The control unit executes control logic to select trip options responsive to slip frequency between the synchronous electrical machines that is induced by a power swing. 1. A method of protecting an electrical system comprising:receiving data indicative of an angle of an impedance trajectory defined by an impedance in the electrical system during a power swing;calculating a value indicative of a frequency of a slip between a first and a second electromagnetic machine M the electrical system that is induced by the power swing, responsive to the data;asserting a trip mode responsive to the calculated value; andoutputting a trip command to a circuit breaking mechanism in the electrical system according to the asserted trip mode so as to decouple the first and the second electromagnetic machines.2. The method of further comprising receiving data indicative of a second angle of the impedance trajectory claim 1 , and wherein the calculating includes calculating the value responsive to the data indicative of the second angle.3. The method of wherein the first angle and the second angle arc defined by the impedance trajectory at an outer blinder crossing point and an inner blinder crossing point claim 2 , respectively.5. The method of wherein the first and second electromagnetic machines include a first and a second electrical generator claim 1 , and the slip frequency is determined by a difference in rotation frequency between rotors in the first and second electrical generators.6. The method of wherein the asserting of a trip mode includes asserting one of a trip on-the-way-in mode and a trip on-the-way-out mode claim 1 , and the outputting further includes outputting the trip command at an earlier time if the trip on-the-way-in mode is asserted ...

METHOD AND APPARATUS FOR OVER VOLTAGE PROTECTION OF A POWER SYSTEM

A method and apparatus for operating an overvoltage response for an electric machine includes opening a first switching element and a second switching element in response to an overvoltage condition. In the instance that the overvoltage condition persists, the method and apparatus can further open a third switchable element to cease the overvoltage condition. 1. An overvoltage response module for an electric machine , comprising:an input configured to receive a power output value of the electric machine;a first output configured to drive a first switchable element at a first leg of an H bridge and a second output configured to drive a second switchable element at a second leg of the H bridge, the H bridge further including an exciter stator of the electric machine disposed between the first leg and the second leg;a third output configured to drive a third switchable element upstream of the H bridge; controllably operate the first switchable element to open, by way of the first output, and the second switchable element to open, by way of the second output, and after a predetermined period of time, compare the power output value with the overvoltage condition of the electric machine, defining a second comparison; and', 'in response to a determination the overvoltage condition exists based on the second comparison, controllably operate the third switchable element to open., 'a controller module configured to compare the power output value with an overvoltage condition of the electric machine, defining a first comparison, and in response to a determination an overvoltage condition exists based on the first comparison2. The overvoltage response module of claim 1 , further comprising a fourth output configured to drive an exciter disconnect relay.3. The overvoltage response module of claim 2 , wherein the controller module is further configured to claim 2 , after a second predetermined period of time claim 2 , compare the power output value with the overvoltage condition ...

THERMAL POWER GENERATION APPARATUS AND THERMAL POWER GENERATION SYSTEM

A thermal power generation apparatus includes a control circuit that selects a single operation mode from among a plurality of modes including a normal mode and a specific mode on the basis of a voltage in a commercial system. The normal mode is an operation mode in which alternating-current power output from an inverter is adjusted so that a direct-current voltage in a direct-current power line follows a target voltage. The specific mode is an operation mode in which direct-current power absorbed by an electric power absorber and/or the amount of heat per unit time supplied to a heat engine are/is adjusted so that the direct-current voltage follows the target voltage. 1. A thermal power generation apparatus comprising:a heat engine that extracts mechanical power from heat supplied by a heat supply source;a power generator that generates alternating-current power from the extracted mechanical power;a converter that generates direct-current power from the generated alternating-current power;an inverter that is connected to the converter via a direct-current power line, the inverter generating alternating-current power from the direct-current power and outputting the alternating-current power to a commercial system;an electric power absorber that is connected to the direct-current power line connecting the converter and the inverter, the electric power absorber absorbing at least part of the direct-current power transmitted from the converter toward the inverter; anda control circuit that detects a voltage drop and voltage recovery in the commercial system and selects a single operation mode from among a plurality of modes including a normal mode and a specific mode,the control circuit, when selecting the normal mode, controlling the inverter to adjust the alternating-current power output from the inverter, thereby causing a direct-current voltage in the direct-current power line to follow a target voltage,the control circuit, when selecting the specific mode, ...

Variable-speed constant-frequency power control

A variable-speed constant-frequency (VSCF) power converter includes a generator control operable to regulate an output voltage of a variable frequency generator at a variable frequency. The VSCF power generator also includes an inverter control operable to regulate a VSCF output voltage at a point-of-regulation at a constant frequency, where the generator control and the inverter control independently control a main line contactor of the point-of-regulation to provide redundant fault protection for an aircraft use.

Method and device for operating a synchronous machine

ABSTRACT OF THE DISCLOSURE Method and device for operating a synchronous machine A synchronous machine (22) can be run up with increasing frequency by a controllable frequency converter (21) with an opened switch (S1) and a closed switch (S2), the exciter direct current for its exciter winding (22E) being supplied by a starting converter (23). When the synchronous machine (22) is operated from the power system, it is excited by the direct-current link of this frequency converter (22). In order to increase the availability of the synchronous machine (22), the two static converters (18, 19) of the frequency converter (21) can be selected in two channels so that when one static converter fails due to a fault, the other one generates the link direct voltage (Uzk) required for the direct-current excitation. The rotor of the synchronous machine (22) can be coupled to a gas turbine (28) via a transmission (27). (Single figure)

A system and method for controlling load dump voltage of a synchronous machine

In an automobile electrical system (10) having an alternator (12) drivingly connected to a vehicle engine (36) the alternator has a polyphase output winding (14) producing a polyphase output in the form of a polyphase alternator voltage for each phase. A load dump apparatus and method for varying the output of the alternator employs a bridge (16) coupled to the polyphase output winding and having a pair of direct voltage output terminals. The bridge has lower and upper switchable elements (80L-80U, 82L-82U, 84U-84L) for each corresponding phase winding, the switchable elements are connected in series across the output of the bridge and have a common or neutral input note connected to the corresponding phase winding. Each switchable element is controllable in accordance with a respective conduction signal (a-aN, b-bN, c-cN) applied thereto. A controller (32-34) produces a plurality of conduction signals, which are applied to the switchable elements for controlling the conduction thereof for controlling the conduction timing for each of the lower switchable elements to render them conductive when the output voltage of the corresponding phase winding is above a selected overvoltage limit.

Multi-channel generator drive system

A multi-channel generating system wherein each channel is provided with a permanent magnet generator (PMG) coupled directly to the output of a constant speed drive. An overrunning clutch is located between the PMG and the generator. The frequency of the signal from the PMG is proportional to the output speed of the constant speed drive. A circuit provides underspeed information if the speed, as indicated by the PMG, drops below a minimum speed represented by a reference voltage. The underspeed information controls the excitation and de-excitation of the generator exciter voltage and a line contactor switch.

Patent DE4204677C1