| 摘要 |
A yaw drive system for a wind energy system includes a hydraulic yaw motor 244 for adjusting the yaw angle of a nacelle of a wind energy system, at least one hydraulic pump 210 adapted for providing a pressurized hydraulic fluid, a hydraulic line system, including at least one line connecting the at least one hydraulic pump 210 and the at least one hydraulic yaw motor 244, and at least one overpressure valve 220. The at least one overpressure valve 220 is connected to a flow path of the hydraulic fluid between the at least one hydraulic pump and the at least one hydraulic motor. Further, a method for changing a yaw angle of a wind turbine nacelle is provided.
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