High voltage DC power generating system including selectively removable neutral node

Patent metadata

Field	Value
Publication number	US-9941827-B2
Application number	US-201615176225-A
Country	US
Kind code	B2
Filing date	Jun 8, 2016
Priority date	Jun 8, 2016
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A high voltage DC electric power generating system includes a poly-phase permanent magnet generator having at least one control winding and a plurality of power windings. Each of the power windings is a phase of the poly-phase permanent magnet generator. A passive rectifier connects a switch to an input of each of the power windings such that the switch is a neutral node in a closed state and a disconnect in an open state.

First claim

The invention claimed is:

1. A high voltage DC electric power generating system comprising:
a poly-phase permanent magnet generator having at least one control winding and a plurality of power windings, each of said power windings being a phase of the poly-phase permanent magnet generator; and
a passive rectifier connecting a switch to an input of each of said power windings such that said switch is a neutral node in a closed state and a disconnect in an open state.

2. The high voltage DC electric power generating system of claim 1 , wherein the at least one control winding is a plurality of control windings.

3. The high voltage DC electric power generating system of claim 2 , wherein each control winding in said plurality of control windings corresponds to a distinct power winding.

4. The high voltage DC electric power generating system of claim 3 , wherein each of said control windings is connected to a DC power source via a distinct power converter.

5. The high voltage DC electric power generating system of claim 4 , wherein each of said distinct power converters is one of a PWM inverter and a set of asymmetric H-bridges.

6. The high voltage DC electric power generating system of claim 3 , wherein each of said control windings is connected to a DC power source via a single power converter.

7. The high voltage DC electric power generating system of claim 6 , wherein said single power converter is an asymmetric H-bridge.

8. The high voltage DC electric power generating system of claim 1 , wherein each of said power windings is connected to a DC load via an active AC-DC rectifier.

9. The high voltage DC electric power generating system of claim 1 , further comprising a power converter connecting said at least one control winding to a DC power source.

10. The high voltage DC electric power generating system of claim 9 wherein the AC-DC rectifier is a passive AC-DC rectifier.

11. The high voltage DC electric power generating system of claim 1 , further comprising a controller communicatively coupled to said switch, and configured to control an open/closed state of the switch.

12. The high voltage DC electric power generation system of claim 1 , wherein the poly-phase permanent magnet generator is a three phase voltage controlled permanent magnet generator.

13. A method for protecting a power generating system comprising:
detecting a short circuit event;
selectively removing a neutral node from a poly-phase permanent magnet generator, thereby preventing power generation for a duration of the short circuit event.

14. The method of claim 13 , wherein selectively removing the neutral node from the permanent magnet generator comprises opening a switch connecting each leg of an AC-DC rectifier, the AC-Dc rectifier being connected to an input of each phase of the poly-phase permanent magnet generator.

15. The method of claim 13 , wherein selectively removing the neutral node comprises reducing a control input of a transistor to 0 volts, thereby placing the transistor in an open state.

16. The method of claim 13 , further comprising correcting a phase imbalance in said poly-phase permanent magnet generator by independently controlling control windings corresponding to each phase of the poly-phase permanent magnet generator.

17. The method of claim 16 , wherein independently controlling control windings comprises providing a current magnitude through at least one of said current windings that is distinct from a current magnitude through each other of the control windings.

18. A method for balancing a power output of a permanent magnet generator comprising:
independently controlling a plurality of control windings, each of said control windings corresponding to a single phase of a poly-phase permanent magnet generator.

19. The method of claim 18 , further comprising determining a current magnitude through each of said control windings required to provide a balanced output power, and providing the determined current magnitude to each of said phases of the poly-phase permanent magnet generator.

20. The method of claim 18 , further comprising detecting a short circuit event and selectively removing a neutral node from the poly-phase generator in response to detecting the short circuit event.

21. The method of claim 20 , wherein selectively removing the neutral node from the permanent magnet generator comprises opening a switch connecting each leg of an AC-DC rectifier, the AC-Dc rectifier being connected to an input of each phase of the poly-phase permanent magnet generator.

Assignees

• Hamilton Sundstrand Corp

Inventors

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

Classifications

• H02P9/36

  using armature-reaction-excited machines · CPC title

• H02P9/14

  by variation of field (H02P9/08, H02P9/10 take precedence) · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02P9/48 Primary

  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

• H02K11/27

  Devices for sensing current, or actuated thereby (overcurrent protection responsive to temperature of the machines or parts thereof, e.g. windings, H02K11/25) · CPC title