US7253537B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method of operating double fed induction generators
Assignee: GE Vernova Infrastructure Technology LLC
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Filing: 2005-12-08
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Granted: 2007-08-07
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Expires: 2025-12-08
Abstract
Abstract A protection system and a protection method are provided for protecting a double fed induction generator and a gearbox during a grid fault. The protection system includes a plurality of controlled impedance devices. Each of the controlled impedance devices is coupled between a respective phase of a stator winding of the double fed induction generator and a respective phase of a grid side converter. The protection system also includes a controller configured for coupling and decoupling impedance in one or more of the plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current.
Inventors
- 👤 Haiqing Weng
- 👤 Robert William Delmerico
- 👤 Xiaoming Yuan
- 👤 Changyong Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:15
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/007; H02P9/006; H02P9/10; H02P2101/00; H02P2101/15
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
73 words
A protection system, comprising: a plurality of controlled impedance devices, each coupled between a respective phase of a stator winding of a double fed induction generator and a respective phase of a grid side converter; and a controller configured for coupling and decoupling impedance in one or more of the plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current.
Claim 2
Dependent Claim
73 words
A protection system, comprising: a plurality of controlled impedance devices, each coupled between a respective phase of a stator winding of a double fed induction generator and a respective phase of a grid side converter; and a controller configured for coupling and decoupling impedance in one or more of the plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current.
Claim 3
Dependent Claim
42 words
The protection system of claim 1 , wherein each controlled impedance device comprises an impedance device in parallel with a semiconductor device, the semiconductor device being configured for coupling and decoupling the impedance device based on control signals received from the controller.
Claim 4
Dependent Claim
16 words
The protection system of claim 2 , wherein the semiconductor device comprises a bidirectional semiconductor device.
Claim 5
Dependent Claim
22 words
The protection system of claim 2 , wherein the semiconductor device comprises a triac, an assembly of thyristors, or anti parallel thyristors.
Claim 6
Dependent Claim
17 words
The protection system of claim 2 , wherein the impedance device comprises impedance of a predetermined magnitude.
Claim 7
Dependent Claim
19 words
The protection system of claim 1 , wherein each controlled impedance device comprises a current dependent variable impedance device.
Claim 8
Dependent Claim
45 words
The protection system of claim 1 , wherein the controller is configured for coupling the impedance in one or more of the plurality of controlled impedance devices when the utility grid voltage drops below or the utility grid current rises above a first threshold value.
Claim 9
Dependent Claim
16 words
The protection system of claim 7 , wherein the impedance increases the stator voltage when coupled.
Claim 10
Dependent Claim
43 words
The protection system of claim 7 , wherein the controller is configured to control the stator voltage in phase with the utility grid voltage to provide unity power factor or to control the stator voltage to provide reactive power to a utility grid.
Claim 11
Dependent Claim
45 words
The protection system of claim 1 , wherein the controller is configured for decoupling the impedance in one or more of the plurality of controlled impedance devices when the utility grid voltage rises above or the utility grid current drops below a second threshold value.
Claim 12
Dependent Claim
82 words
The protection system of claim 1 , wherein the controlled impedance device further comprises an impedance device in parallel with a semiconductor device, the semiconductor device being configured for coupling the impedance device when the utility grid voltage drops below or the utility grid current rises above a first threshold value and decoupling the impedance device when the utility grid voltage rises above or the utility grid current drops below a second threshold value based on control signals received from the controller.
Claim 13
Dependent Claim
53 words
The protection system of claim 1 , wherein each controlled impedance device comprises a current dependent variable impedance device, the current dependent variable impedance device configured for offering high impedance when stator current rises above a first threshold value and a very low impedance when stator current drops below a second threshold value.
Claim 14
Dependent Claim
84 words
A wind turbine generator, comprising: a wind turbine coupled to a double fed induction generator; a plurality of controlled impedance devices, each coupled between a respective phase of a stator winding of the double fed induction generator and a respective phase of a grid side converter; and a controller configured for coupling and decoupling impedance in one or more of the plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current.
Claim 15
Dependent Claim
84 words
A wind turbine generator, comprising: a wind turbine coupled to a double fed induction generator; a plurality of controlled impedance devices, each coupled between a respective phase of a stator winding of the double fed induction generator and a respective phase of a grid side converter; and a controller configured for coupling and decoupling impedance in one or more of the plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current.
Claim 16
Dependent Claim
23 words
The wind turbine generator of claim 13 , wherein the wind turbine is coupled to the double fed induction generator via a gearbox.
Claim 17
Dependent Claim
43 words
The wind turbine generator of claim 13 , wherein each controlled impedance device comprises an impedance device in parallel with a semiconductor device, the semiconductor device being configured for coupling and decoupling the impedance device based on control signals received from the controller.
Claim 18
Dependent Claim
20 words
The wind turbine generator of claim 13 , wherein each controlled impedance device comprises a current dependent variable impedance device.
Claim 19
Dependent Claim
46 words
The wind turbine generator of claim 13 , wherein the controller is configured for coupling the impedance in one or more of the plurality of controlled impedance devices when the utility grid voltage drops below or the utility grid current rises above a first threshold value.
Claim 20
Dependent Claim
46 words
The wind turbine generator of claim 13 , wherein the controller is configured for decoupling the impedance in one or more of the plurality of controlled impedance devices when the utility grid voltage rises above or the utility grid current drops below a second threshold value.
Claim 21
Dependent Claim
71 words
A protection method, comprising: coupling and decoupling impedance in one or more of a plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current, wherein each of the plurality of controlled impedance devices is coupled between a respective phase of a stator winding of a double fed induction generator and a respective phase of a grid side converter.
Claim 22
Dependent Claim
71 words
A protection method, comprising: coupling and decoupling impedance in one or more of a plurality of controlled impedance devices in response to changes in at least one of a utility grid voltage and a utility grid current, wherein each of the plurality of controlled impedance devices is coupled between a respective phase of a stator winding of a double fed induction generator and a respective phase of a grid side converter.
Claim 23
Dependent Claim
51 words
The method of claim 19 , wherein coupling and decoupling the impedance comprises coupling and decoupling an impedance device via a semiconductor device based on control signals received from a controller, the semiconductor device being connected in parallel with the impedance device in each of the plurality of controlled impedance devices.
Claim 24
Dependent Claim
33 words
The method of claim 19 , wherein coupling and decoupling the impedance comprises coupling and decoupling the impedance in a current dependent variable impedance device based on control signals received from a controller.
Claim 25
Dependent Claim
32 words
The method of claim 19 , wherein coupling the impedance comprises coupling the impedance when the utility grid voltage drops below or the utility grid current rises above a first threshold value.
Claim 26
Dependent Claim
32 words
The method of claim 19 , wherein decoupling the impedance comprises decoupling the impedance when the utility grid voltage rises above or the utility grid current drops below a second threshold value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2010-08-06 | 2011-02-05 | 2011-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-08-06 | 2015-02-05 | 2015-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-08-06 | 2019-02-05 | 2019-08-07 | $7700.00 | Window Closed / Lapsed |