IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0254172
(2010-03-05)
|
등록번호 |
US-9273668
(2016-03-01)
|
우선권정보 |
SE-0950127 (2009-03-05) |
국제출원번호 |
PCT/EP2010/052863
(2010-03-05)
|
§371/§102 date |
20110901
(20110901)
|
국제공개번호 |
WO2010/100271
(2010-09-10)
|
발명자
/ 주소 |
- Bjork, Mikael
- Wickstrom, Anders
- Haag, Christian
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
The present invention relates to a yaw system 5 for a windmill 1, the windmill comprising a tower 2 and a nacelle 3, the tower and the nacelle being joined by the yaw system and the yaw system further comprising a bearing fixed to the tower, on which bearing the nacelle rests and slides in a yawing
The present invention relates to a yaw system 5 for a windmill 1, the windmill comprising a tower 2 and a nacelle 3, the tower and the nacelle being joined by the yaw system and the yaw system further comprising a bearing fixed to the tower, on which bearing the nacelle rests and slides in a yawing movement, and at least one yaw motor arranged to allow the nacelle to perform a rotary motion along the bearing, wherein the yaw system 5 further comprises control means 8 for continuously operating the at least one yaw motor in such a way that the yaw motor strives to maneuver the nacelle according to a setpoint. The invention also relates to a method for controlling the yaw of a windmill 1, comprising the steps of determining a set point for the windmill 1, calculating a yaw error based on the set point and a current alignment of the windmill, determining a size and direction of a torque based at least on the yaw error, and applying the torque to at least one yaw motor of a yaw system for turning the turbine, whereby the method also comprises the step of continuously calculating the yaw error and applying the torque in order to strive towards the setpoint.
대표청구항
▼
1. A yaw system for a windmill, the windmill comprising a tower and a nacelle, the tower and the nacelle being joined by the yaw system, wherein the yaw system comprises: a bearing fixed to the tower, on which bearing the nacelle rests and slides in a yawing movement;at least one yaw motor configure
1. A yaw system for a windmill, the windmill comprising a tower and a nacelle, the tower and the nacelle being joined by the yaw system, wherein the yaw system comprises: a bearing fixed to the tower, on which bearing the nacelle rests and slides in a yawing movement;at least one yaw motor configured to allow the nacelle to perform a rotary motion along the bearing; anda control for continuously operating the at least one yaw motor in such a way that the at least one yaw motor maneuvers the nacelle towards a setpoint,wherein the yaw system is configured to allow the nacelle to divert from the setpoint whenever an external yaw wise torque on the nacelle exceeds an allowed torque capacity of the at least one yaw motor. 2. The yaw system according to claim 1, wherein the at least one yaw motor is configured to provide both negative and positive torque, respectively. 3. The yaw system according to claim 1, wherein the control is configured to achieve four quadrant control. 4. The yaw system according to claim 3, wherein at least one yaw motor property from the four quadrant control is used to control a pitch angle of at least one turbine blade of a turbine or the turbine itself. 5. The yaw system according to claim 1, wherein the yaw system is configured to control the pitch angle of at least two turbine blades independently from each other. 6. The yaw system according to claim 1, wherein the control is configured to detect unbalances to a turbine using at least one yaw motor property. 7. The yaw system according to claim 6, wherein upon detection of the unbalances, the control is configured to minimize the detected unbalances by altering the pitch angle of at least one turbine blade. 8. The yaw system according to claim 1, wherein the control is further configured to determine a direction of the nacelle that is the most favorable with respect to conditions affecting the windmill, using at least one yaw motor property. 9. The yaw system according to claim 1, wherein the control is further configured to determine wind conditions such as wind speed, wind direction, wind shear or upflow, based on at least one yaw motor property. 10. The yaw system according to claim 6, wherein the control system is configured to react by activating an alarm function if the detected unbalances exceed a predetermined value. 11. A method for controlling the yaw of a windmill, the method comprising: determining a set point for the windmill;determining a yaw error based on the set point and a current alignment of the windmill;determining a size and direction of a torque based at least on the yaw error;applying the torque to at least one yaw motor of a yaw system for turning the turbine;continuously calculating the yaw error and applying the torque in order to maneuver towards the set point; andusing the yaw system to allow the nacelle to divert from the set point if an external yaw wise torque on the nacelle exceeds an allowed torque capacity of the at least one yaw motor. 12. The method according to claim 11, further comprising achieving four quadrant control in order to control the yaw system. 13. The method according to claim 12, wherein a yaw motor torque feedback from the four quadrant control is used to control a pitch angle of at least one turbine blade of the turbine. 14. The method according to claim 11, wherein the yaw system controls the pitch angle of at least two turbine blades independent from each other. 15. The method according to claim 11, wherein a yaw motor torque feedback is used to detect unbalances to the turbine.
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