RECONFIGURABLE MULTI-PERMANENT MAGNET GENERATOR BASED POWER GENERATING SYSTEM

• US 20170359011A1
• Filed: 06/08/2016
• Published: 12/14/2017
• Est. Priority Date: 06/08/2016
• Status: Abandoned Application

• Current Assignee: Hamilton Sundstrand Corporation (Rtx Corporation)
• Original Assignee: Hamilton Sundstrand Corporation (Rtx Corporation)
• Inventors: Rozman, Gregory I., Gieras, Jacek F., Moss, Steven J.
• Application Number:
  US15/176,232
• Publication Number:
  US 20170359011A1
• Time in Patent Office: Days
• CPC Class Codes: H02P 29/0241 the fault being an overvoltage
• CPC Class Codes: H02P 5/74 controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence
• CPC Class Codes: H02P 9/302 Brushless excitation
• CPC Class Codes: H02P 9/38 Self-excitation by current derived from rectification of both output voltage and output current of generator
• CPC Class Codes: H02P 9/48 Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle H02P9/04 - H02P9/46 take precedence

Abstract

A high voltage power generating system includes a first poly-phase permanent magnet generator including at least one control winding and a plurality of power windings, a second poly-phase permanent magnet generator including at least one control winding and a plurality of power windings, the first and second poly-phase permanent magnet generators being arranged in series in at least one operational mode, and the first poly-phase permanent magnet generator being phase shifted relative to the second poly-phase permanent magnet generator such that residual voltage output of the first poly-phase permanent magnet generator is offset by the second poly-phase permanent magnet generator during a first operational mode.

Claims

1. A high voltage power generating system comprising:

a first poly-phase permanent magnet generator including at least one control winding and a plurality of power windings;

a second poly-phase permanent magnet generator including at least one control winding and a plurality of power windings;

the first and second poly-phase permanent magnet generators being arranged in series in at least one operational mode; and

the first poly-phase permanent magnet generator being phase shifted relative to the second poly-phase permanent magnet generator such that residual voltage output of the first poly-phase permanent magnet generator is offset by the second poly-phase permanent magnet generator during a first operational mode.

2. The high voltage power generating system of claim 1, wherein the first operational mode is a short circuit condition at a power generating bus.

3. The high voltage power generating system of claim 1, wherein the first poly-phase permanent magnet generator is connected to an input of the second poly-phase permanent magnet generator via a first set of switches and connected to a first power generating bus via a second set of switches, the first set of switches and the second set of switches having an inverted state relative to each other.

4. The high voltage power generating system of claim 3, wherein an input of the second poly-phase permanent magnet generator is connected to a second power generating bus via a third set of switches, and an output of the second poly-phase permanent magnet generator is connected to the first power generating bus via a fourth set of switches, the third set of switches and the fourth set of switches having an inverted state relative to each other.

5. The high voltage power generating system of claim 4, wherein the state of each set of switches is controlled by a generator control unit, and wherein the first set of switches and the third set of switches are closed during said first operational mode.

6. The high voltage power generating system of claim 4, wherein the first power generating bus and the second power generating bus are AC busses.

7. The high voltage power generating system of claim 4, wherein the first power generating bus and the second power generating bus are DC busses.

8. The high voltage power generating system of claim 1, further comprising a selectively removable neutral node connected to an output of said second poly-phase permanent magnet generator via a DC rectifier.

9. The high voltage power generating system of claim 1, wherein each of said poly-phase permanent magnet generators has an identical number of phases.

10. The high voltage power generating system of claim 9, wherein each of said poly-phase permanent magnet generators has three phases.

11. A method for achieving null output voltage of a power generating system including multiple permanent magnet generators comprising:

reducing a control current of a first permanent magnet generator to zero;

detecting a residual output of the first permanent magnet generator; and

controlling a control current to a second permanent magnet generator, such that the second permanent magnet generator generates an offsetting voltage, thereby reducing the residual voltage to 0 volts.

12. The method of claim 11, wherein reducing the control current of the first permanent magnet generator to zero, detecting the residual output of the first permanent magnet generator, and controlling a control current to a second permanent magnet generator, such that the second permanent magnet generator generates an offsetting voltage, are performed in response to detecting a short circuit event at a power generating bus.

13. The method of claim 12, further comprising reconfiguring a power generating system such that the first permanent magnet generator and the second permanent magnet generator are arranged in series in response to detecting the short circuit event.

14. The method of claim 13, wherein reconfiguring the power generating system comprises inverting at least a first, second, third and fourth set of switches.

15. The method of claim 11, further comprising removing a selectively removable neutral node from said second permanent magnet generator.

16. The method of claim 15, wherein removing the selectively removable neutral node comprises opening a switch.