ACTIVE RECTIFICATION FOR A VARIABLE-FREQUENCY SYNCHRONOUS GENERATOR
First Claim
1. An active rectifier controller that controls the operation of an active rectifier in converting main alternating current (AC) voltage from a generator to a direct current (DC) output voltage while maintaining AC current drawn from the generator in phase with BEMF voltage of the generator, the controller comprising:
- a first input for receiving position information representative of the rotor position of the generator independent of a load connected to the generator;
a phase/speed detector that determines phase position and speed of the generator based on the received rotor position information;
a second input connectable to monitor a direct current (DC) output voltage of the active rectifier;
a voltage regulator that generates a current command based on the monitored DC output voltage and determined speed of the generator;
a third input connectable to monitor AC currents drawn by the active rectifier; and
a current regulator that generates the PWM control signals based on the current command provided by the voltage regulator, the monitored AC currents, and determined rotor position and speed of the generator provided by the phase/speed detector such that the AC current drawn by the active rectifier remains in-phase with BEMF voltage of the generator.
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Accused Products
Abstract
An active rectifier controller decouples measurements of the phase and speed of a variable frequency synchronous generator from measurements of the AC output voltage. The active rectifier controller receives position information representative of the rotor position of the VFSG independent of a load connected to the VFSG that is used to determine the phase position and speed of the VFSG. Based on measurements of the generator speed and phase, the active rectifier controller controls the active rectifier to draw AC currents in-phase with the back-electromotive force (BEMF) voltage of the VFSG.
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Citations
18 Claims
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1. An active rectifier controller that controls the operation of an active rectifier in converting main alternating current (AC) voltage from a generator to a direct current (DC) output voltage while maintaining AC current drawn from the generator in phase with BEMF voltage of the generator, the controller comprising:
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a first input for receiving position information representative of the rotor position of the generator independent of a load connected to the generator; a phase/speed detector that determines phase position and speed of the generator based on the received rotor position information; a second input connectable to monitor a direct current (DC) output voltage of the active rectifier; a voltage regulator that generates a current command based on the monitored DC output voltage and determined speed of the generator; a third input connectable to monitor AC currents drawn by the active rectifier; and a current regulator that generates the PWM control signals based on the current command provided by the voltage regulator, the monitored AC currents, and determined rotor position and speed of the generator provided by the phase/speed detector such that the AC current drawn by the active rectifier remains in-phase with BEMF voltage of the generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling an active rectifier to maintain the current drawn by the active rectifier in-phase with the rotor position of the generator, the method comprising:
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receiving at a first input receiving position information representative of the rotor position of the generator independent of a load connected to the generator; determining position and speed information associated with the generator based on the position information received at the first input; receiving at a second input a monitored DC output voltage generated by the active rectifier; generating a current command based on the monitored DC output voltage, speed dependent torque-to-current ratio, and the determined speed of the generator; and generating control signals provided to the active rectifier based on the current command provided by the voltage regulator. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A power generation/conversion system comprising:
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a variable frequency starter/generator (VFSG) having a permanent magnet generator (PMG) portion, an exciter portion, and a main generator portion that generates an alternating current (AC) output voltage in response to mechanical energy provided by a shaft; a high-frequency active rectifier connected to convert the AC output voltage provided by the VFSG to a direct current (DC) output voltage; means for monitoring rotor position information representative of the rotor position of the VFSG independent of a load connected to the VFSG; and an active rectifier controller for controlling the operation of the high-frequency active rectifier based, in part, on the monitored position information, wherein the active rectifier controller calculates phase position and speed of the VFSG based on the monitored rotor position information and controls the high-frequency active rectifier such that the AC current drawn by the active rectifier remains in-phase with BEMF voltages of the VFSG. - View Dependent Claims (17, 18)
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Specification