Doubly-fed induction generator system for a gas turbine

Patent metadata

Field	Value
Publication number	US-10003239-B1
Application number	US-201615381982-A
Country	US
Kind code	B1
Filing date	Dec 16, 2016
Priority date	Dec 16, 2016
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

The present application provides a doubly-fed induction generator system for a multi-shaft gas turbine engine. The doubly-fed induction generator system may include a first doubly-fed induction generator in communication with a first shaft of the multi-shaft gas turbine engine, a first rotor of the first doubly-fed induction generator in communication with a converter via a first rotor bus, and a first breaker on the first rotor bus. The first doubly-fed induction generator acts as a generator or a motor depending in part upon the position of the first breaker.

First claim

We claim:

1. A doubly-fed induction generator system for a multi-shaft gas turbine engine, comprising:
a first doubly-fed induction generator in communication with a first shaft of the multi-shaft gas turbine engine;
a first rotor of the first doubly-fed induction generator in communication with a converter via a first rotor bus; and
a first breaker on the first rotor bus;
wherein the first doubly-fed induction generator acts as a generator or a motor depending in part upon the position of the first breaker.

2. The doubly-fed induction generator system of claim 1 , wherein the converter is in communication with an electrical grid.

3. The doubly-fed induction generator system of claim 2 , wherein a first stator of the first doubly-fed induction generator is in communication with the electrical grid via a stator bus.

4. The first doubly-fed induction generator system of claim 3 , wherein the stator bus comprises a second breaker thereon.

5. The doubly-fed induction generator system of claim 4 , wherein the first rotor bus and the stator bus are in communication with one or more switches and transformers.

6. The doubly-fed induction generator system of claim 1 , wherein the first rotor is in communication with a high pressure turbine of the multi-shaft gas turbine engine via the first shaft.

7. The doubly-fed induction generator system of claim 1 , further comprising a second generator in communication with a second shaft of the multi-shaft gas turbine engine.

8. The doubly-fed induction generator system of claim 7 , wherein the second generator comprises a second doubly fed induction generator.

9. The doubly-fed induction generator system of claim 8 , wherein the second doubly-fed induction generator comprises a second rotor in communication with the converter via a second rotor bus.

10. The doubly-fed induction generator system of claim 9 , wherein the second rotor is in communication with a low pressure turbine of the gas turbine engine via the second shaft.

11. The doubly-fed induction generator of claim 9 , wherein the second rotor bus comprises a third breaker thereon.

12. The doubly-fed induction generator of claim 11 , wherein the second doubly-fed induction generator acts as a generator or a motor depending in part upon the position of the third breaker.

13. The doubly-fed induction generator system of claim 8 , wherein a second stator of the second doubly-fed induction generator is in communication with an electrical grid via a stator bus.

14. The double-fed induction generator system of claim 13 , wherein the stator bus is in communication with one or more switches and transformers.

15. A method of operating a multi-shaft gas turbine engine, comprising:
positioning a doubly-fed induction generator on a first shaft of the multi-shaft gas turbine engine;
operating the doubly-fed induction generator as a motor during start-up of the multi-shaft gas turbine engine; and
operating the doubly-fed induction generator as a generator during full load operations of the multi-shaft gas turbine engine.

16. A doubly-fed induction generator system for a multi-shaft gas turbine engine, comprising:
a first doubly-fed induction generator in communication with a first shaft of the multi-shaft gas turbine engine;
a first rotor of the first doubly-fed induction generator in communication with a converter via a first rotor bus; and
a second generator in communication with a second shaft of the multi-shaft gas turbine engine.

17. The doubly fed induction generator system of claim 16 , wherein the second generator comprises a second doubly fed induction generator.

18. The double fed induction generator system of claim 17 , wherein the second doubly-fed induction generator comprises a second rotor.

19. The double fed induction generator system of claim 18 , wherein the second rotor is in communication with the converter.

20. The doubly-fed induction generator system of claim 19 , wherein the converter is in communication with an electrical grid.

Assignees

• Gen Electric

Inventors

• Zhang Hua
• Codron Fabien Thibault
• Siden Gunnar Leif
• Beadie Frank Douglas

Classifications

• H02P9/42

  to obtain desired frequency without varying speed of the generator · CPC title

• F05D2260/85

  Starting · CPC title

• H02P9/30

  using semiconductor devices · CPC title

• H02K7/1823 Primary

  structurally associated with turbines or similar engines · CPC title

• H02P9/14

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