Brushless permanent magnet generator plus auxiliary voltage source constant potential exciter

Patent metadata

Field	Value
Publication number	US-9252695-B2
Application number	US-201414206449-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Mar 12, 2014
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

An alternating current power generation system including an alternating current generator comprising an exciter, a brushless permanent magnet generator voltage source configured to generate a first voltage at a first frequency, a second voltage source configured to generate a second voltage at a second frequency, and a coil. Further, the brushless permanent magnet generator voltage source provides the first voltage as a supplemental voltage supply combined with the second voltage source at the coil to generate a constant exciter field received by the exciter of the alternating current generator.

First claim

The invention claimed is:

1. An alternating current power generation system, the system comprising:
an alternating current generator comprising an exciter;
a brushless permanent magnet generator voltage source configured to generate a first voltage at a first frequency;
a second voltage source configured to generate a second voltage at a second frequency;
an automatic voltage regulator configured to receive the first voltage and the second voltage; and
a coil, wherein the brushless permanent magnet generator voltage source provides the first voltage as a supplemental voltage supply combined with the second voltage at the coil to generate a constant exciter field received by the exciter of the alternating current generator.

2. The system of claim 1 , wherein the second voltage source supplies a three-phase alternating current voltage as a primary voltage supply.

3. The system of claim 2 , comprising a first full-wave bridge rectifier coupled to a direct current bus, wherein the first full-wave bridge rectifier receives an output of the brushless permanent magnet generator voltage source and a second full-wave bridge rectifier coupled to the direct current bus, wherein the second full-wave bridge rectifier receives an output of the second voltage source.

4. The system of claim 3 , wherein the first full-wave bridge rectifier and the second full-wave bridge rectifier comprise a blocking mechanism to prevent back feeding voltage into both the brushless permanent magnet generator voltage source and the second voltage source.

5. The system of claim 2 , comprising an isolation power potential transformer, wherein the supplemental voltage supply is provided to an input of the isolation power potential transformer, and the isolation power potential transformer generates an isolated three-phase alternating current voltage signal that is isolated from the second voltage source and supplements the output of the brushless permanent magnet generator voltage source.

6. The system of claim 1 , wherein the second voltage source is a direct current battery source and the second voltage source supplies a direct current voltage at the coil.

7. The system of claim 1 , wherein the supplemental voltage supply provides a voltage to mitigate a voltage drop at the output of the second voltage source within approximately 50 ms upon acceptance of a load on a grid coupled to the alternating current power generation system.

8. The system of claim 1 , wherein the brushless permanent magnet generator generates the first voltage at approximately 150 Hz, and the second voltage source generates the second voltage at approximately 50 Hz.

9. The system of claim 1 , wherein the automatic voltage regulator comprises one or more full-wave bridge rectifiers and an automatic voltage regulator controller, wherein the automatic voltage regulator controls voltage application to a coil of the constant exciter field to vary a magnitude of the constant exciter field.

10. The system of claim 9 , wherein the automatic voltage regulator controls the voltage application to the coil of the constant exciter field based on a voltage level and a current level of an output of the alternating current generator.

11. A device comprising:
an automatic voltage regulator, wherein the automatic voltage regulator controls voltage entering a coil of an exciter field, wherein the automatic voltage regulator comprises:
a power converter configured to:
rectify voltage inputs received from a permanent magnet generator and a second voltage source at differing frequencies; and
supply a voltage to a direct current bus; and

an automatic voltage regulator controller configured to:
receive data from an output of an alternating current generator; and
control application of the voltage at the direct current bus to the coil of the exciter field based on the data received from the output of the alternating current generator.

12. The device of claim 11 , wherein the power converter comprises a rectifier that rectifies received voltage inputs.

13. The device of claim 12 , wherein the rectifier comprises at least one full-wave bridge rectifier.

14. The device of claim 11 , comprising one or more transistors, wherein the automatic voltage regulator controller supplies signals to the one or more transistors along the direct current bus to control the voltage applied to the coil of the exciter field.

15. The device of claim 11 , wherein the power converter comprises a full-wave bridge rectifier to rectify the voltage input from the permanent magnet generator.

16. A method for controlling an output of an alternating current generator, the method comprising:
receiving voltage from a brushless permanent magnet generator and a second voltage source at an automatic voltage regulator, wherein the voltage received from the brushless permanent magnet generator comprises a different frequency than the voltage received from the second voltage source;
receiving signals indicating a current level and a voltage level of the output of the alternating current generator at the automatic voltage regulator; and
controlling an application of the voltage from the brushless permanent magnet generator and the second voltage source at a coil of an exciter field to vary a magnitude of the exciter field, wherein the exciter field excites an alternating current exciter within the alternating current generator, the alternating current exciter controls a generating field of the alternating current generator, and the generating field controls the output of the alternating current generator.

17. The method of claim 16 , further comprising rectifying the voltage received from the permanent magnet generator and the second voltage source via two full-wave bridge rectifiers.

18. The method of claim 16 , wherein supplying signals for the automatic voltage regulator to one or more transistors positioned on a circuit containing the coil of the exciter field controls the application of the voltage from the brushless permanent magnet generator and the second voltage source at the coil of the exciter field.

19. The method of claim 18 , wherein the signals indicating the current level and the voltage level of the output of the alternating current generator provide values used to control the transistors.

20. The method of claim 16 , wherein receiving voltage from the second voltage source comprises receiving an isolated three-phase voltage signal that is isolated from the second voltage source via an isolation power potential transformer.

Assignees

• Gen Electric

Inventors

• Benya Jr Edward George
• Stitt Jametra Frajai

Classifications

• H02P9/302 Primary

  Brushless excitation · CPC title

• H02P9/10 Primary

  Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load · CPC title