IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0560448
(2006-11-16)
|
등록번호 |
US-7514809
(2009-07-01)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
9 |
초록
▼
A wind turbine is disclosed. The wind turbine includes a synchronous generator having a stator and a rotor, and an AC-DC-AC link for coupling the synchronous generator to a grid, the AC-DC-AC link including a DC link. The DC link is used for supplying an excitation voltage to a rotor winding of the
A wind turbine is disclosed. The wind turbine includes a synchronous generator having a stator and a rotor, and an AC-DC-AC link for coupling the synchronous generator to a grid, the AC-DC-AC link including a DC link. The DC link is used for supplying an excitation voltage to a rotor winding of the rotor. A DC-DC converter connects the DC link to the rotor winding of the rotor.
대표청구항
▼
What is claimed is: 1. A wind turbine comprising, a synchronous generator having a stator and a rotor, an AC-DC-AC link for coupling said synchronous generator to a grid, the AC-DC-AC link comprising a DC link, and a DC-DC converter connecting the DC link to a rotor winding of the rotor, wherein th
What is claimed is: 1. A wind turbine comprising, a synchronous generator having a stator and a rotor, an AC-DC-AC link for coupling said synchronous generator to a grid, the AC-DC-AC link comprising a DC link, and a DC-DC converter connecting the DC link to a rotor winding of the rotor, wherein the DC link used for supplying an excitation voltage to the rotor winding of said rotor. 2. The wind turbine according to claim 1, wherein the generator is an electrically excited synchronous generator. 3. The wind turbine according to claim 1, wherein said DC-DC converter has a conversion ratio in the range of about 20:1 to 2:1. 4. The wind turbine according to claim 1, wherein the DC link provides a ride-through capability of the rotor excitation voltage for one or more seconds. 5. The wind turbine according to claim 1, wherein DC link provides a ride-through capability of the rotor excitation voltage for low voltage and zero voltage excursions of a grid voltage. 6. The wind turbine according to claim 1, wherein a DC link voltage drops for a maximum of 1 to 10% compared to normal DC link voltage during a zero grid voltage excursion. 7. The wind turbine according to claim 1, wherein the DC link is decoupled from grid. 8. The wind turbine according to claim 1, wherein the AC-DC-AC link further comprises a generator-side AC-DC inverter and a grid-side DC-AC inverter, wherein the DC link is formed between the generator-side AC-DC inverter and the grid-side DC-AC inverter. 9. The wind turbine according to claim 1, further comprising a bypass contactor for bypassing a grid-side DC-AC inverter. 10. A wind turbine comprising, a synchronous generator having a stator and a rotor, an AC-DC-AC link for coupling said synchronous generator to a grid, the AC-DC-AC link comprises a generator-side AC-DC inverter, a DC link, and a grid-side DC-AC inverter, a DC-DC converter connecting the DC link to a rotor winding of the rotor, wherein the DC link is configured to supply an excitation voltage to the rotor winding of the rotor, and wherein the generator-side AC-DC inverter, the grid-side DC-AC inverter, and the DC-DC converter are integrated into one component. 11. An intermediate DC voltage circuit for a wind turbine, comprising a generator-side AC-DC inverter adapted to be coupled to stator windings of a synchronous generator of the wind turbine; a grid-side DC-AC inverter adapted to be coupled to a utility grid; a circuit connecting said generator-side AC-DC inverter and said grid-side DC-AC inverter; and a DC-DC converter adapted to be connected between said circuit and rotor windings of said synchronous generator. 12. The intermediate DC voltage circuit according to claim 11, wherein said DC-DC converter has a conversion ratio in the range of about 20:1 to 2:1. 13. The intermediate DC voltage circuit according to claim 11, wherein a DC link voltage drops for a maximum of 1 to 10% compared to an operational DC link voltage during a zero grid voltage excursion. 14. The intermediate DC voltage circuit according to claim 11, further comprising a bypass contactor for bypassing the grid-side DC-AC inverter. 15. A method of starting a wind turbine with an electrically excited synchronous generator, comprising the steps of: (a) opening a grid contactor; (b) closing a bypass contactor to bypass a grid-side DC-AC inverter of said wind turbine; (c) charging a DC link of said wind turbine; (d) supplying an excitation voltage to rotor windings of said synchronous generator, wherein said excitation voltage is supplied from the DC link; and (e) opening said bypass connector and closing said grid connector. 16. The method according to claim 15, wherein step (d) comprises the step of converting the DC link voltage to a generator excitation voltage. 17. The method according to claim 16, wherein conversion is carried out with a conversion ratio in the range of about 20:1 to 2:1. 18. The method according to claim 15, wherein the grid-side DC-AC inverter is synchronized with a grid frequency prior to step (e). 19. The method according to claim 15, wherein a generator-side AC-DC inverter is synchronized with a grid frequency prior to step (e).
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