Electric power generating system with a permanent magnet generator and combination of active and passive rectifiers

Patent metadata

Field	Value
Publication number	US-10122306-B2
Application number	US-201715453350-A
Country	US
Kind code	B2
Filing date	Mar 8, 2017
Priority date	Mar 8, 2017
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

An electric power generating system (EPGS) may comprise a permanent magnet generator (PMG) comprising a rotor comprising a permanent magnet and a stator comprising a first armature winding configured to output a first three-phase voltage, and a second armature winding configured to output a second three-phase voltage. The EPGS may further comprise a passive rectifier configured to rectify the first three-phase voltage, an active rectifier configured to rectify the second three-phase voltage, and an active rectifier controller, wherein the active rectifier is controllable in response to a current reference received by the active rectifier controller. An EPGS may comprise a tunable notch filter configured to filter a first DC voltage and/or a DC output voltage, in accordance with various embodiments.

First claim

What is claimed is:

1. An electric power generating system (EPGS) comprising,
a permanent magnet generator (PMG) comprising:
a rotor;
a stator comprising:
a first armature winding configured to output a first three-phase voltage; and
a second armature winding configured to output a second three-phase voltage;

a passive rectifier configured to rectify the first three-phase voltage received from the first armature winding;
an active rectifier configured to rectify the second three-phase voltage received from the second armature winding,
wherein the passive rectifier is configured to output a first direct current (DC) voltage and the active rectifier is configured to output a second DC voltage; and
a tunable notch filter comprising a capacitor and a variable inductor, the tunable notch filter configured to filter at least one of the first DC voltage and the second DC voltage, the tunable notch filter tunable in response to a rotational velocity of the rotor; and
an auto-tuning notch filter control, comprising:
a frequency detector;
a current regulator;
a pulse width modulator; and
an H-bridge,

wherein the auto-tuning notch filter control detects a rotational frequency of the rotor and regulates a current through a secondary winding of the variable inductor.

2. The EPGS of claim 1 , wherein the tunable notch filter is connected across the passive rectifier and configured to filter the first DC voltage.

3. The EPGS of claim 1 , wherein the tunable notch filter is connected across both the passive rectifier and the active rectifier and configured to filter a DC output voltage comprising a sum of at least the first DC voltage and the second DC voltage.

4. The EPGS of claim 3 , further comprising:
a voltage sensor electrically configured to sense the DC output voltage;
a voltage regulator in electronic communication with the voltage sensor and configured to receive a sensor signal from the voltage sensor; and
an active rectifier controller configured to receive a current reference signal from the voltage regulator,
wherein the active rectifier is controllable in response to the current reference signal received by the active rectifier controller.

5. The EPGS of claim 1 , wherein
the secondary winding of the variable inductor is configured to receive the current from a power supply via the H-bridge; and
the auto-tuning notch filter control utilizes a table look-up to determine the current based upon the rotational frequency of the rotor.

6. The EPGS of claim 1 , wherein the variable inductor is mechanically coupled to the stator.

7. The EPGS of claim 6 , wherein at least a portion of the variable inductor is disposed within a plurality of slots of the stator.

8. The EPGS of claim 1 , further comprising a current sensor connected in series with the secondary winding of the variable inductor and configured to send a current signal to the current regulator.

9. A method for generating electric power, comprising:
rotating a rotor of a permanent magnet generator;
generating, via a first stator armature winding, a first three-phase voltage in response to the rotating;
rectifying, via a passive rectifier, the first three-phase voltage into a first DC voltage;
generating, via a second stator armature winding, a second three-phase voltage in response to the rotating;
rectifying, via an active rectifier, the second three-phase voltage into a second DC voltage;
controlling, via an active rectifier controller, the active rectifier;
filtering, via a tunable notch filter, at least one of the first DC voltage and the second DC voltage, the tunable notch filter comprising a variable inductor and a capacitor;
detecting, via an autonomous notch filter control, a rotational frequency of the rotor, wherein the tunable notch filter is tunable in response to a rotational frequency of the rotor; and
regulating, by the autonomous notch filter control, a current through a secondary winding of the variable inductor,
wherein the auto-tuning notch filter control comprises: a frequency detector; a current regulator; a pulse width modulator; and an H-bridge.

10. The method of claim 9 , further comprising:
sending, by a voltage sensor, a sensor signal to a voltage regulator; and
sending, by the voltage regulator a current reference signal to the active rectifier controller,
wherein the controlling the active rectifier regulates the second DC voltage in response to the current reference signal.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Rozman Gregory I
• Moss Steven J
• Gieras Jacek F

Classifications

• H02P9/00 Primary

  Arrangements for controlling electric generators for the purpose of obtaining a desired output · CPC title

• H02P2103/20

  of the synchronous type · CPC title

• H02M7/04 Primary

  by static converters · CPC title

• H02M1/14

  Arrangements for reducing ripples from DC input or output · CPC title

• H02P9/48

  Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle (H02P9/04 - H02P9/46 take precedence) · CPC title