Abstract: A method of operating a wind power plant during grid loss is disclosed. The method includes powering a blade pitch drive of the wind power plant by an energy storing unit, and adjusting the pitch of the rotor blades of the wind power plant by means of the blade pitch drive, wherein a rotor shaft keeps rotating and the wind power plant enters a self-sustaining power generating mode upon adjustment of the pitch of the blades.

Abstract: A voltage control apparatus for an electric generator includes a load response controller and a voltage response controller. The electric generator includes a field winding and is driven by an engine of a motor vehicle. When the output voltage of the generator decreases below a threshold voltage upon the application of an electrical load, the rotational speed of the engine fluctuates to repeatedly increase and decrease until it is stabilized. During the time periods in which the rotational speed of the engine decreases, field current supplied to the field winding of the generator is gradually increased under a load response control performed by the load response controller. During the time periods in which the rotational speed of the engine increases, the field current is gradually increased under a voltage response control by the voltage response controller.

Abstract: A system, method, and apparatus for stabilizing interactions between an electrical generator and a nonlinear load are described. One illustrative embodiment includes an impedance element that is coupled to an output of the generator and a power source coupled to the impedance element. The power source applies power to, or across, the impedance element so as to reduce energy loss that would ordinarily occur due to energy dissipation by way of the impedance element. In many variations, the power source operates within a defined bandwidth so that a stabilizing effect is achieved outside of this bandwidth.

Abstract: Electric vehicle charging methods, battery charging methods, electric vehicle charging systems, energy device control apparatuses, and electric vehicles are described. In one arrangement, an electric vehicle charging method includes receiving information regarding charging of an electric vehicle with energy from an electric power grid, determining an amount of energy stored by an energy storage device coupled to the electric power grid, and controlling a transfer of the energy stored by the energy storage device to the electric power grid using the information regarding the charging of the electric vehicle. Other arrangements are described.

Abstract: A pre-charge circuit limits in-rush currents on a direct current (DC) link that includes a first DC link bus and a second DC link bus. The pre-charge circuit includes a switching device connected in series with the first DC link bus. The switching device has an ON state in which power flow is enabled on the DC link and an OFF state in which power is disabled on the DC link. A controller selectively modulates the state of the switching device to limit in-rush currents on the DC link.

Abstract: Apparatus for measuring load angle in a synchronous generator is disclosed. The synchronous generator is of a type comprising a main machine, an exciter for exciting the main machine, and a permanent magnet machine for exciting the exciter. The apparatus comprises means for sensing a waveform produced by the permanent magnet machine, means for sensing a waveform produced by the main machine, and means (20) for comparing the waveform produced by the permanent magnet machine with the waveform produced by the main machine to produce a measure of load angle. The measure of load angle may be used to provide a warning of potential pole slip.

Abstract: A method for validating and initializing a control system for an electrical generator connected to a power converter in a wind turbine. The method may include generating a first parameter value representing control signal for controlling the stator flux of a stator of the electrical generator, measuring a second parameter value specifying an electrical operational characteristic of the electrical generator, and determining an accuracy level of the control signal based on the first parameter value and the second parameter value, wherein the accuracy level of the control signal has to fall within a predefined threshold for the control system to be validated.

Abstract: 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.

Abstract: In an inverter generator having an engine generator unit generating alternating current, a converter converting the alternating current to direct current, an inverter that converts the direct current to alternating current, an inverter driver that drives switching elements with a PWM signal generated using a reference sine wave of a desired output voltage waveform and a carrier and makes the alternating current to the alternating current of a predetermined frequency, the alternating current supplied to an electrical load is detected, gains Gn (n: 2, 3, 4, 5, 6, . . . m) of n-th harmonics of the reference sine wave and amplitudes An are calculated from the detected current, and the reference sine wave is corrected by a sum obtained by the calculated gains and amplitudes. With this, the reference sine wave is accurately corrected to reliably remove harmonic distortion components from the output voltage waveform.

Abstract: A wind park, a method of correcting voltage imbalances, and a wind turbine are provided. The wind park includes at least one wind turbine; a transformer coupled between the at least one wind turbine and a power grid. The transformer includes a primary winding arrangement coupled to the power grid, and a secondary winding arrangement coupled to the at least one wind turbine. The power grid includes at least three power lines, each power line conducting a respective phase of a multi-phase current. Each power line of the power grid is coupled to the primary winding arrangement via an individual tap changer. Influences of the detected voltage imbalances on the wind turbines can be compensated.

Abstract: A control device has a unit for selecting each of states of an inverter applying a voltage to a generator, a unit for predicting a first current of the generator, flowing at a second time elapsed by one control period from a first time, from a detected current and the state of the inverter at the first time, a unit for predicting a second current of the generator at a third time elapsed by one control period from the second time while using the first current as an initial value of the second current, from information indicating one selected state set at the second time, for each selected state, a unit for determining one state corresponding to the second current nearest to instruction, and a unit for setting the inverter in the determined state at the second time to control current of the generator.

Abstract: An approach for reduction in generator-sourced fault current contribution is disclosed. In one aspect, automatic excitation control of a generator is coordinated with a generator step-up transformer operating on maximized tap selection to reduce generator fault current contribution to an electrical power distribution network.

Abstract: Within generator systems maintenance of stability in terms of voltage is desirable. Generally, several generators will be arranged in parallel within the generator system with one generator voltage controlled to provide dynamic responsiveness to load switching. With regard to some loads which are generally of an active nature, the capacity of a first generator, which is voltage controlled, may be insufficient to adequately avoid transient voltage instability. By providing an actuator signal from a load to act as a pre-emptive or forward feed to an electrical current controlled generator, that second electrical current generator can be arranged to provide additional or reduced electrical current to avoid system voltage instability.

Abstract: A drive and a method, including an electric motor, which is supplied by a rectifier, the rectifier including a time-discrete closed-loop control structure, which regulates the stator current of the electric motor by setting the voltage applied at the motor, the current of the motor being acquired in time-discrete fashion, the closed-loop control structure including a closed-loop controller whose actual value is a first current component of the current, the setpoint input of the closed-loop controller being coupled with at least one upstream setpoint limiter.

Abstract: A control system that can accommodate the wide variations in the output of a generator, such as a permanent magnet alternator, while providing an output with relatively uniform phase ripple. The control system includes a zero crossing detector and variable ramp generator for generating control signals to a switching rectifier to generate a regulated DC signal.

Abstract: A system and method for supplying increased frequency supporting current from a doubly fed induction generator (DFIG) to assist in maintaining grid stability is provided. The output capability of a line side converter associated with the DFIG is enhanced by significantly increasing the current handling capacity of electric switches forming the converter. A dynamic brake is also provided across a DC link bus coupling the line side converter to another converter coupled to the rotor of the DFIG. The dynamic brake is controlled based on the voltage across the DC link bus.

Abstract: A wind energy installation includes a wind rotor, a double-fed asynchronous generator driven by the wind rotor, a converter provided with a first part on the generator side connected to a rotor and a second part on the network side connected to a stator of the generator, and a control device providing converter regulation. A mode selector can be switched between a normal operating mode and a reduced voltage operating mode, in which the excitation of the generator is reduced compared to the normal operating mode. The under-excitation produces an additional reactive current, thus reducing the rotor voltage. The rotor voltage can be limited even when the load is high and the network frequency or voltage is incorrect. The usable rotation speed range of the wind energy installation can be extended to provide a more powerful generator with a higher rating, without changing the converter.

Abstract: To shorten a startup interval to reach a synchronizing condition, a phase difference and an amplitude difference between the grid voltage and the stator voltage of one phase of a winding are obtained. The difference in amplitude is decreased prior to or in parallel to synchronizing the stator voltage with the grid voltage. The calculated compensation phase compensation value is used as an initial value for synchronizing at the next synchronizing operation.

Abstract: A control system for an electrical power generation system (EPGS) provides overload protection without disconnecting a generator of the EPGS from an excessive electrical load. Available engine power and current levels of the electrical load are continuously measured and computed. A command voltage is calculated in real time that corresponds to a voltage required to sustain with the maximum available power. Output voltage of a generator of the EPGS is controlled at the calculated command voltage so that a power limit of the engine is not exceeded during electrical overload conditions.

Abstract: A fault tolerant generator apparatus includes subsystems isolated from each other, so that the generator may operate in a fault mode with low torque ripple. The apparatus comprises a machine and a power controller unit. In an embodiment, the machine has a plurality of electrical three phase windings and the power controller unit has a plurality of power converters. Each three phase winding of the machine is coupled to a separate corresponding power converter to form an operating subsystem. The operating subsystems are physically and electrically isolated from each other to provide fault tolerant operation of the apparatus. Accordingly, each of the operating subsystems is effective to provide a balanced electrical load for the machine.

Abstract: Power conversion apparatus and methods are presented for providing electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.

Abstract: The present invention relates to an alternator comprising: an alternator stator (2) comprising a main secondary winding (7) delivering an output voltage; at least one auxiliary winding (3); and an exciter field winding (5) powered by the auxiliary winding(s); a regulator (20) for regulating the output voltage of the alternator; and an alternator rotor (8) comprising an exciter secondary winding (6); a rotary field winding (4) powered by the exciter secondary winding (6); and a control circuit (10) for controlling the power supply to the rotary field winding (4) and configured to maintain the amplitude of the output voltage from the alternator at a predetermined level by controlling the power supply to the rotary field winding (4) in response to a control signal coming from the voltage regulator (20), the auxiliary winding(s) (3) generating a voltage because they are exposed to a varying magnetic field generated by the rotary field winding (4) in rotation.

Abstract: The disclosure concerns a wind power plant and its operation during grid loss, wherein the wind power plant comprises a plurality of rotor blades, a blade pitch drive, a rotor shaft, an electric generator, and a control unit for controlling the operations of the wind power plant, wherein the plurality of rotor blades are rotatably connected to the rotor shaft, such that the pitch of the rotor blades can be adjusted by the blade pitch drive under the control of the control unit, and wherein the rotor shaft is operatively connected to the electric generator for generating electric energy, the wind power plant further comprising an energy storing unit for powering the blade pitch drive, wherein the control unit comprises a control module for adjusting the rotor blades and for entering a self-sustaining mode of operation of the wind power plant.

Abstract: A method and apparatus for modifying interactions between an electrical generator and a nonlinear load is described. One illustrative embodiment receives a main control signal at a control input of an engine of the electrical generator, the main control signal controlling at least one of output power, output current, and output voltage delivered by the electrical generator to the nonlinear load, the engine being one of a power amplifier and a converter; measures the impedance of the nonlinear load; and feeds to the electrical generator a compensation signal corresponding to the measured impedance, the compensation signal rendering a transfer function of the output power of the electrical generator with respect to the main control signal substantially insensitive to variations in the impedance of the nonlinear load to stabilize the output power of the electrical generator.

Abstract: A control system for an electrical power generation system (EPGS) provides overload protection without disconnecting a generator of the EPGS from an excessive electrical load. Available engine power and current levels of the electrical load are continuously measured. A command voltage is calculated that corresponds to a voltage required to sustain with the maximum available power. Output voltage of a generator of the EPGS is controlled at the calculated command voltage so that a power limit of the engine is not exceeded during electrical overload conditions.

Abstract: An apparatus comprising: a first input that receives a first rotational speed information of a windmill mechanically generated by a mechanical rotation detection unit; a second input that receives a second rotational speed information of the windmill based on an alternating current output of a generator attached to the windmill; and a controller configured to compare the first and second rotational speed information, to determine whether a difference between the first and second rotational speed information is greater than a predetermined value and to execute a predetermined anomaly processing in response to the difference being greater than the predetermined value.

Abstract: A power generation system is provided that includes an internal combustion engine configured to provide rotational mechanical energy. A generator is configured to receive the rotational mechanical energy and generate electrical power in response to the rotational mechanical energy. A fluid medium is provided to the internal combustion engine and to the generator for removing thermal energy from the internal combustion engine and from the generator.

Abstract: In an inverter generator having an engine generator unit, a converter that converts generated alternating current to direct current, an inverter that converts the direct current to alternating current with switching elements to supply to an electrical load, an inverter driver that drives the switching elements with a PWM signal and makes the alternating current of a predetermined frequency, the alternating current supplied to the electrical and voltages of the direct and alternating currents are detected, the detected voltage of the alternating current is corrected as a predetermined value based on a coefficient (DCgainA) set based on the detected voltage of the direct current, when the detected alternating current is greater than a threshold value, and the PWM signal is corrected by the predetermined, thereby limiting overcurrent.

Abstract: Method and system of control of the converter of an electricity generation facility of the type which comprises at least one electric generator, such as a wind generator, connected to an electricity network, in the presence of voltage sags in said network, the electric generator being a double-fed asynchronous generator formed by two windings, a winding in the stator, directly connected to the network, and a winding in the rotor which is fed on normal regime by said converter which imposes on it a predetermined voltage current called setpoint current. In the event of a voltage sag occurring, the converter imposes a new setpoint current which is the result of adding to the previous setpoint current a demagnetizing current which generates a flow in the rotor winding opposed to the free flow, consequently reducing the voltage in converter connectors.

Abstract: A static compensator apparatus for a HVDC system may control harmonic wave compensation at high passive speed to meet operating characteristics of the HVDC system. A static compensator is turned-on in a normal mode and compensates for invalid power and removes a harmonic wave generated by the high voltage direct current system. A static compensator controller controls an operation of the static compensator. A diesel power generator operates complementarily to the static compensator and being turned-on when the high voltage direct current system starts.

Abstract: The invention relates to a method for operating a wind energy installation (10), in which the wind energy installation (10) has a rotor (12, 13, 22), at least one rotor blade (14) with an adjustable angle, a mechanical brake device (19) for braking the rotor (14), an operational control device (15, 15?) and a safety system (16, 20). The invention also relates to a corresponding wind energy installation (10). The method according to the invention is defined by the following method steps: braking of the rotor (12, 13, 22) by means of an angular adjustment (28) with an average angular adjustment rate of less than 8.

Abstract: A generator system that includes a three-phase AC machine and an active rectifier bridge employing low on-resistance MOSFET switches for converting the AC current from the machine to a DC current. The system also includes a switch control circuit to switch the MOSFET switches in synchronization with the three-phase current flow. The system determines the phase-to-ground voltages of the machine as inputs to the switch control circuit. The control circuit calculates the phase-to-phase voltages from the phase-to-ground voltages. The control circuit then determines if each of the phase-to-phase voltages is above or below first and second predetermined threshold voltages, where if the phase-to-phase voltage is above the first threshold voltage, the control circuit closes the switch, and if the phase-to-phase voltage is below the second threshold voltage, the control circuit opens the switch.

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

Abstract: A generator device with a generator regulator and a generator unit having a generator and a rectifier arrangement. The generator regulator has an operating voltage connection and a phase voltage connection. Furthermore, if during a control intervention of the phase voltage the DC voltage applied to the operating voltage connection exceeds a predefined limit for a predefined period of time, the generator regulator deactivates the control intervention of the phase voltage.

Abstract: A method of operating a pitch controlled wind turbine connected to the utility grid in response to an increase in wind velocity to above a predefined value. The method includes the sequential steps of: reducing the generated power, allowing an intermediate increase in the generator speed, and reducing the generator speed by pitching the wind turbine rotor blades. A wind turbine and a cluster of wind turbines is also contemplated.

Abstract: A system includes an induction generator controller configured to operate an induction generator via a converter. The induction generator controller includes a diagnostic mode configured to instruct the converter to send an input signal to a rotor of the induction generator, receive an output signal from the rotor and a stator of the induction generator, and identify winding faults within the rotor and/or the stator based on the output signals.

Abstract: A control system for an electrical power generation system (EPGS) provides overload protection without disconnecting a generator of the EPGS from an excessive electrical load. Available engine power and current levels of the electrical load are continuously measured. A command voltage is calculated that corresponds to a voltage required to sustain with the maximum available power. Output voltage of a generator of the EPGS is controlled at the calculated command voltage so that a power limit of the engine is not exceeded during electrical overload conditions.

Abstract: A dual channel power generation system comprises: a prime mover; a permanent magnet (PM) dynamoelectric machine that has a PM rotor coupled to the prime mover, two multiphase alternating current (AC) stators that develop electromotive force (EMF) in response to rotation of the PM rotor due to the magnetic flux linkage between the PM rotor and the stators, two control coils that each change the magnetic flux linkage of a respective stator in response to the level of a control current that passes through the control coil; a multiphase AC rectifier for each stator that receives AC power from its respective stator to supply DC power on a respective rectifier bus; a current feedback loop for each rectifier bus; a voltage feedback loop for each rectifier bus; a load-sharing controller responsive to both current feedback loops to develop a voltage regulator reference signal for each rectifier bus that is representative of the value of voltage that its corresponding stator should produce to maintain equal values of c

Abstract: Methods and systems for minimizing power loss in generator are disclosed, including providing one or more operating parameters for a generator, and determining an optimal field power and an optimal phase angle, where the optimal field power and the optimal phase angle substantially minimize a power loss in operating the generator at the one or more operating parameters.

Abstract: Excitation control circuitry for a synchronous generator is disclosed. The synchronous generator is of a type comprising a main machine (2) and an exciter (6) for exciting the main machine. The excitation control circuitry comprises an automatic voltage regulator (10) for controlling power flow from the main machine to the exciter, and an excitation boost system (14) for selectively supplying power from a second source of electrical power (12) to the exciter (6). This can allow additional excitation to be provided, for example, when the generator is in overload. This arrangement can allow a synchronous generator to be upgraded by adding the excitation boost system to provide enhanced overload performance.

Abstract: The invention relates to a method of controlling a wind turbine connected to an electric utility grid during malfunction in said electric utility grid, said method comprising the steps of detecting a malfunction in said electric utility grid and monitoring at least one physical work property of at least one component of said wind turbine. Further, the method controls the pitch of one or more wind turbine blades of said wind turbine in order too keep said least one physical work property below at least one predefined limit in a time period of said malfunction. The invention also relates to a control system for a wind turbine connected and supplying electric power to a utility grid as well as a wind turbine and park hereof.

Abstract: A hybrid voltage regulator controls the voltage of three phases of alternating electricity produced by an alternator. A digital voltage regulator produces an average of the RMS voltage for each phase and produces an error value based on a ratio of the voltage to the frequency of the alternating electricity. The RMS voltage average and the error value are used to modify a voltage command designating a desired voltage level. The modified voltage command is processed by an analog voltage regulator that rectifies the alternator output voltage which then is averaged over an period of time. The resultant average voltage value is utilized to modify the voltage command to produce a regulated voltage command that determines a level of current to apply to excite the alternator.

Abstract: A control apparatus controls power generation of an electric generator and communicates with an external control apparatus. The control apparatus includes a receiver, a controller, an initialization state detector, and a transmitter. The receiver receives a command signal transmitted by the external control apparatus. The controller controls power generation of the electric generator according to the command signal received by the receiver. The initialization state detector detects an initialization state of the control apparatus. The transmitter transmits, when the initialization state of the control apparatus is detected by the initialization state detector, an informing signal to the external control apparatus, thereby informing the external control apparatus that the control apparatus is in the initialization state.

Abstract: A vehicle system that includes an engine control apparatus which regulates engine idling speed incorporates a battery current detection apparatus which acquires information expressing the value of field current of an engine-driven electric generator and detects a condition of high electrical load as occurrence of a battery discharge current exceeding a threshold value, and responds to that condition by notifying the engine control apparatus of a higher value of field current of the electric generator than the actual value, to thereby effect a rapid increase in engine speed and so rapidly increase the output power of the electric generator.

Abstract: Certain embodiments of the present technology provide voltage regulator-alternator configurations that can distribute loads among a plurality of alternators, and fail-safe mechanisms used in connection with such voltage regulator-alternator configurations. For example, certain embodiments of the present technology provide electrical systems that include voltage regulators with connections over which control signals, which indicate whether a detected voltage is higher or lower than a target voltage, can be transmitted to other voltage regulators and received from other voltage regulators. For example, certain embodiments of the present technology provide voltage regulators that include connections over which control signals can be transmitted to other voltage regulators and received from other voltage regulators.

Abstract: A control apparatus controls power generation of an electric generator and communicates with an external control apparatus. The control apparatus includes a receiver, a controller, an initialization state detector, and a transmitter. The receiver receives a command signal transmitted by the external control apparatus. The controller controls power generation of the electric generator according to the command signal received by the receiver. The initialization state detector detects an initialization state of the control apparatus. The transmitter transmits, when the initialization state of the control apparatus is detected by the initialization state detector, an informing signal to the external control apparatus, thereby informing the external control apparatus that the control apparatus is in the initialization state.

Abstract: The invention relates to a method for the controlled application of a stator-current target value (ISnom) and a torque target value (Mnom) for a polyphase machine (4) that is supplied by an electronic power converter.

Abstract: An apparatus for controlling generation of power to be generated by a generator driven by an engine mounted on a vehicle equipped with an electrical load operative on the power from the generator, the generator including a field winding to which current is supplied on the power, and a duty cycle of the current being increased to maintain the power of the generator, the apparatus comprising duty cycle limit means for limiting an increasing rate of the duty cycle in response to an increase in an amount of the load when the engine is in an idle state; rotation frequency detecting means for detecting the rotation frequency of the engine; and limit value deciding means for deciding a limit value for the increasing rate of the duty cycle to a greater value than a limit value corresponding to the idle state, when the rotation frequency detecting means detects a decrease in the rotation frequency.

Abstract: DC power for low power loads is provided for vehicles such as snowmobiles where the electrical system includes primarily AC power. DC voltage is provided for gauges and similar loads even though the peak value of the AC is below a desired level. Rectification and regulation of some energy from the alternator is used for supplying the DC power at a desired DC voltage that is above an alternator zero to peak value. A capacitor and a diode are connected in parallel from the alternator with rectifying circuit portions for supplying power to the DC load. A DC voltage monitor senses the DC voltage supplied to the DC load and prevents the DC voltage from rising above the desired voltage by controlling the first rectification, the second rectification, or both.

Abstract: A controller of a generator (1) for a vehicle comprising a voltage regulator (3) for regulating a generated voltage to a predetermined voltage by performing on/off control of a field current through a switching element and performing variable control of a regulated voltage with a control signal from an external control unit (4) is further provided with a maximum duty factor limiting circuit (300) for limiting the maximum duty factor of the switching element (Q3) performing on/off control of the field current.