IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0570396
(2009-09-30)
|
등록번호 |
US-8360723
(2013-01-29)
|
발명자
/ 주소 |
- Veldkamp, Bart
- Hessel, Christoph
- Nies, Jacob
- Hoffmann, Till
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
▼
A method is presented that reduces vibrations of a wind turbine in a situation where yawing of a wind rotor of said wind turbine is at least temporarily not possible. The method includes adjusting a first pitch angle of a first rotor blade and a second pitch angle of a second rotor blade such that t
A method is presented that reduces vibrations of a wind turbine in a situation where yawing of a wind rotor of said wind turbine is at least temporarily not possible. The method includes adjusting a first pitch angle of a first rotor blade and a second pitch angle of a second rotor blade such that the first and second pitch angles differ by at least 30 degrees.
대표청구항
▼
1. A method for reducing vibrations of a wind turbine, the wind turbine comprising a wind rotor comprising at least a first rotor blade and a second rotor blade, the method comprising: adjusting a first pitch angle of the first rotor blade and a second pitch angle of the second rotor blade so that t
1. A method for reducing vibrations of a wind turbine, the wind turbine comprising a wind rotor comprising at least a first rotor blade and a second rotor blade, the method comprising: adjusting a first pitch angle of the first rotor blade and a second pitch angle of the second rotor blade so that the first and second pitch angles differ by at least 30 degrees, wherein the adjusting occurs when the wind turbine is in a state where yawing of the wind rotor is not possible and the wind rotor remains in a fixed yaw position throughout the adjusting. 2. The method according to claim 1, wherein the state of the wind turbine where yawing of the wind rotor is not possible is effectuated by a grid loss. 3. The method according to claim 1, wherein the state of the wind turbine where yawing of the wind rotor is not possible is effectuated when a yaw system of the wind turbine is out of function. 4. The method according to claim 1, wherein the first and second pitch angles differ by at least 45 degrees. 5. The method according to claim 1, wherein the wind rotor further comprises a third rotor blade and the method further comprises: adjusting a third pitch angle of said third rotor blade such that the third pitch angle differs from the first and second pitch angles by at least 30 degrees, respectively, wherein the adjusting occurs when the wind turbine is in a state where yawing of the wind rotor is not possible and the wind rotor remains in a fixed yaw position throughout the adjusting. 6. The method according to claim 5, wherein the third pitch angle differs from the first and second pitch angles by at least 45 degrees, respectively. 7. The method according to claim 5, wherein at least one of the pitch angles is in the range from 0 degrees up to, but not including, 180 degrees and at least one of the pitch angles is in the range from 180 degrees up to, but not including, 360 degrees. 8. The method according to claim 5, wherein at least one of the pitch angles is zero degrees. 9. The method according to claim 5, wherein the difference in clockwise direction between the first and second pitch angle is in the range from 30 to 150 degrees, the difference in clockwise direction between the second and third pitch angle is in the range from 30 to 120 degrees and the difference in clockwise direction between the first and third pitch angle is in the range from 60 to 270 degrees. 10. The method according to claim 5, wherein the pitch angles of the first, second, and third rotor blades differ by at least 45 degrees, respectively. 11. The method according to claim 1, wherein, upon detection of the state where yawing of the wind rotor is not possible, the wind rotor is parked in a position where none of the rotor blades are positioned in the vicinity of a tower of the wind turbine. 12. The method according to claim 11, wherein one rotor blade is pointing downwards and a pitch axis of said rotor blade forms an angle in the range of more than 15 degrees with a longitudinal axis of the wind turbine tower. 13. The method according to claim 1, further comprising: parking the wind rotor in a position wherein each of the rotor blades forms an angle of at least 15 degrees with an axis of a wind turbine tower. 14. The method according to claim 13, wherein the wind rotor is locked in said position when the wind turbine is in a state where yawing of the wind rotor is not possible and the wind rotor remains in a fixed yaw position. 15. The method according to claim 1, further comprising: determination of at least one variable selected from the group consisting of a tower vibration, a fore-aft vibration of the wind rotor, a wind direction, a wind speed, a yaw angle offset, a rotor position, and any combination thereof; and adjusting the pitch angles of the first and second rotor blades based on the at least one determined variable. 16. The method according to claim 1, wherein the pitch angles of the rotor blades are set to values so that vibration damping occurs in at least two mutually orthogonal spatial directions. 17. A wind turbine comprising: a wind rotor comprising at least a first rotor blade and a second rotor blade, each of the rotor blades being rotatable about a pitch axis for adjustment of its respective pitch angle;a pitch drive system configured to adjust the pitch angles of each rotor blade; anda wind turbine controller configured to control the pitch drive system to make pitch angle adjustments including to adjust a first pitch angle of the first rotor blade and a second pitch angle of the second rotor blade so that the first and second pitch angles differ by at least 30 degrees when the wind turbine is in a state where yawing of the wind rotor is not possible and the wind rotor remains in a fixed yaw position throughout the pitch angle adjustments. 18. The wind turbine according to claim 17, wherein the wind rotor further comprises a third rotor blade mounted to a rotor hub and being rotatable about a pitch axis for adjustment of its pitch angle by the pitch drive system, and wherein the wind turbine controller is further configured to adjust, a third pitch angle of the third rotor blade such that the first, second, and third pitch angles differ by at least 30 degrees, respectively, when the wind turbine is in a state where yawing of the wind rotor is not possible and the wind rotor remains in a fixed yaw position throughout the pitch angle adjustments. 19. The wind turbine according to claim 17, further comprising: a vibration detector configured to detect vibrations of at least one wind turbine component, wherein the wind turbine controller is further configured to adjust the first and second pitch angles based on the detected vibrations such that the vibrations of the wind turbine component are reduced.
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