IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0606807
(2009-10-27)
|
등록번호 |
US-7800243
(2010-10-11)
|
우선권정보 |
DK-PA 2007 00654(2007-04-30) |
발명자
/ 주소 |
- Bendixen, Flemming Buus
- Andersen, Gert Karmisholt
- Larsen, Kim Brondum
|
출원인 / 주소 |
|
대리인 / 주소 |
St. Onge Steward Johnston & Reens LLC
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
10 |
초록
▼
A variable rotational speed wind turbine includes a doubly-fed induction generator, a rotor current controller for controlling the rotor currents of the generator, a compensation mechanism having a computation mechanism, and an input mechanism for providing input to the compensation mechanism, the i
A variable rotational speed wind turbine includes a doubly-fed induction generator, a rotor current controller for controlling the rotor currents of the generator, a compensation mechanism having a computation mechanism, and an input mechanism for providing input to the compensation mechanism, the input being representative of at least the instantaneous angular speed of the rotor of the generator. The computation mechanism is arranged to compute an instantaneous compensation control output in dependency of the instantaneous angular speed of the rotor of the generator and feed the compensation control output to the rotor, and to compute the compensation control output during operation of the wind turbine to compensate at least partly for dependencies on the rotor angular speed of the locations of poles of a generator transfer function, thus making a resulting generator transfer function substantially independent of variations in the rotor angular speed during operation of the wind turbine.
대표청구항
▼
What is claimed is: 1. A variable rotational speed wind turbine comprising a wind turbine rotor comprising one or more blades, a doubly-fed induction generator coupled to the wind turbine rotor, a rotor current controller arranged to control currents of a rotor of the generator, compensation means
What is claimed is: 1. A variable rotational speed wind turbine comprising a wind turbine rotor comprising one or more blades, a doubly-fed induction generator coupled to the wind turbine rotor, a rotor current controller arranged to control currents of a rotor of the generator, compensation means having computation means, and means for providing input to the compensation means, the input being representative of at least an instantaneous angular speed of the rotor of the generator, wherein the computation means is arranged to compute an instantaneous compensation control output in dependency of said instantaneous angular speed of the rotor of the generator and feed the compensation control output to the rotor of the generator, the computation means being arranged to compute said compensation control output during operation of the wind turbine to compensate at least partly for dependencies on the rotor angular speed of the locations of poles of a generator transfer function, thus making a resulting generator transfer function substantially independent of variations in the rotor angular speed during operation of the wind turbine. 2. The wind turbine according to claim 1, wherein the compensation control output is added to an output from the rotor current controller. 3. The wind turbine according to claim 1, wherein the means for providing input to the compensation means furthermore provides input representing electrical quantities. 4. The wind turbine according to claim 3, wherein said electrical quantities are currents and voltages. 5. The wind turbine according to claim 3, wherein said input includes a rotor reference current. 6. The wind turbine according to claim 3, wherein said input includes stator currents. 7. The wind turbine according to claim 3, wherein said input includes rotor currents. 8. The wind turbine according to claim 3, wherein the transfer function of the compensation means furthermore is designed for computing the control output so that the rotor currents are effectively decoupled into two mutually orthogonal components that may be controlled substantially independently by the rotor current controller. 9. The wind turbine according to claim 1, wherein the compensation means comprises means for providing damping of oscillations of the control output. 10. The wind turbine according to claim 9, wherein the means for providing damping of oscillations comprises one or more lead filters. 11. The wind turbine according to claim 9, wherein the means for providing damping of oscillations are designed to provide damping at a frequency that deviates less than 5% from a grid frequency. 12. The wind turbine according to claim 9, wherein the means for providing damping of oscillations are tuneable to one or more well-defined frequencies. 13. A method for operating a variable rotational speed wind turbine having a doubly-fed induction generator coupled to a rotor of the wind turbine, comprising the steps of: providing input to compensation means, the input being representative of at least an instantaneous angular speed of a rotor of the generator, arranging computation means of the compensation means to compute an instantaneous compensation control output in dependency of said instantaneous angular speed of the rotor of the generator during operation of the wind turbine to compensate at least partly for dependencies on the rotor angular speed of locations of poles of a generator transfer function, thus making a resulting generator transfer function substantially independent of variations in the rotor angular speed during operation of the wind turbine, and feeding the compensation control output to the rotor of the generator. 14. The method according to claim 13, further comprising the step of arranging the computation means for computing the control output so that rotor currents are effectively decoupled into two mutually orthogonal components that may be controlled substantially independently by a rotor current controller. 15. The method according to claim 13, further comprising the step of arranging the compensation means for providing damping of oscillations of the control output. 16. The method according to claim 15, wherein the provided damping of oscillations is tuneable to one or more well-defined frequencies.
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