The regulating device (5) according to the invention for an excitation alternator (9) comprises a voltage feedback loop (6) and a temperature feedback loop (15) comprising means for measuring/estimating temperature supplying a current temperature (T), a comparator (18) generating a temperature error (T) between a maximum permissible temperature (T.sub.max) and the current temperature, means for inputting a current speed of rotation of the alternator, a control module (19) supplying a percentage of a maximum permissible excitation (r.sub.max) as a function of the temperature error and a speed correction supplied by speed correction means according to a predetermined correction law as a function of the current rotation speed.

A controllable voltage-generating apparatus includes a mechanically driven, separately excited generator. An electric output voltage of the generator is rectified by a rectifier. The voltage-generating apparatus can be controlled by a control system. A voltage-control device of the control system has a calculation device, by way of which an electric excitation signal for the generator can be calculated by way of a defined interpolation from measurement values of the electric excitation signals of the voltage-generating apparatus.

To provide a generator controller can determine permission of power generation autonomously within a range where startability is not deteriorated, even in the case where the generator controller cannot communicate with the engine controller. A generator controller, in case of communication normal time with engine controller, permits the generation voltage control when the permission command signal is received from the engine controller and the generator rotational speed is higher than a determination value at communication normal time, and prohibits the generation voltage control at other times; in the case of communication failure time, permits the generation voltage control when the generator rotational speed is higher than a determination value at communication failure time, and prohibits the generation voltage control at other times.

Provided are a control method and system for enhancing an endurance capability to an abnormal voltage of a wind turbine generator system. The control method, includes; providing a doubly-fed wind turbine generator system connected to a power grid; detecting a voltage of the power grid, and determining whether the voltage of the power grid has a fault; when the voltage of the power grid has a fault, detecting a voltage of the DC buses, and determining whether the voltage of the DC buses exceeds a limit value; when the voltage of the DC buses exceeds the limit value, performing integrated system coordination control according to an abnormal operating condition mode; and when the voltage of the power grid returns to a normal range, performing integrated system coordination control according to a normal operating condition mode.

An aircraft power generation unit to generate direct current (DC) power includes a flux regulated permanent magnet generator (PMG) that includes first through fourth sets of windings and a control coil and a rectifier section that include first through fourth six pulse rectifiers and a common local output bus. The unit also includes an output bus configured to be connected to the load and an H-bridge circuit connected across the output bus and outputs connected to the control coil. A controller receives an input signal from at least one of the windings and selectively couples either the common local output bus and fourth rectifier to the output bus negative rail and one or more of the first, second and third six-pulse rectifiers to the output bus to provide a constant voltage to the load.

In an embodiment a method includes: sensing a first signal indicative of magnetization of a winding in a dynamoelectric machine; applying the first signal to a window comparator having a comparator window between upper and lower thresholds and generating window exit signals indicative of the first signal exiting the comparator window of the window comparator; generating a slowed-down replica signal of the first signal; updating the comparator window of the window comparator as a function of the slowed-down replica signal; and issuing a wake-up signal towards a control device of the dynamoelectric machine as a result of one of the window exit signals indicating the first signal exiting the comparator window of the window comparator for a time duration in excess of a duration threshold.

The present disclosure provides a wind power generation system, which comprises a wind turbine for generating mechanical energy; a generator for converting the mechanical energy into electrical energy; a converter for converting the electrical energy to expected power for supplying to a grid, wherein a rotor of the generator is connected to converter, an output of a stator of the generator and an output of a converter are both connected to the grid; a controller for controlling the converter to absorb rotor-side reactive power Q.sub.rotor and to increase line-side reactive power Q.sub.line, so as to meet a reactive power demand of the grid, when a rotor speed is less than a predetermined value.

Disclosed herein is a converter for converting an AC voltage to a DC voltage, the converter comprising: a first H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; a second H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; an isolation block arranged between the second AC terminal of the first H-bridge circuit and the second AC terminal of the second H-bridge circuit; and a DC voltage output of the converter with a first terminal and a second terminal; wherein: the first terminal of the DC voltage output is connected to the first DC terminal of the first H-bridge circuit and the first DC terminal of the second H-bridge circuit; and the second terminal of the DC voltage output is connected to the second DC terminal of the first H-bridge circuit and the second DC terminal of the second H-bridge circuit.

An electric power system (EPS) may comprise a permanent magnet synchronous generator (PMSG), a high speed rectifier configured to receive a first alternating current (AC) power from the PMSG, and a low speed rectifier configured to receive a second AC power from the PMSG. The low speed rectifier may be configured to receive the first AC power in response to the PMSG rotating at a first rotational speed, and the high speed rectifier may be configured to receive the second AC power in response to the PMSG rotating at a second faster rotational speed.

A voltage generating device includes a mechanically driven generator that is separately excited. An electric starting voltage of the generator is rectified by way of a rectifier. The voltage generating device is closed-loop-controlled by way of a regulating device. A current regulating device has a model of an excitation coil of the generator, and a model value of the electric excitation current of the generator can be ascertained using the model. The current regulating device additionally has a correction element, by way of which the model value of the electric excitation current can be corrected such that the model value of the electric excitation current better matches the actual value of the electric excitation current in a defined manner.