The yaw system is the subsystem on a wind turbine which ensures that the rotor plane of the turbine always is facing the wind direction. Studies from  show that a soft yaw system may be utilized to dampen the loads in the wind turbine structure. The soft yaw system operates much like a suspension system on a car, leading the loads away from the turbine structure. However, to realize a soft hydraulic yaw system a new design concept must be found. As a part of the development of the new concept a preliminary concept evaluation has been conducted, evaluating seven different hydraulic yaw concepts, ranging from a one-to-one copy of the electrical drive (electrical drives replaced by hydraulic dittos), to floating suspension systems mounted on hydraulic cylinders. Rough calculations of size and consequences of the different systems are presented ending up with the final concept for further investigation. Loads and yaw demands are based on the IEC 61400-1 standard for wind turbine design, and the loads for this examination are extrapolated from the HAWC2 aeroelastic design code. The concepts are based on a 5 MW off-shore turbine.
Proceedings of the 8th International Conference on Fluid Power Transmission and Control, Icfp 2013, 2013, p. 134-138
Hydraulic; Yas system; Soft yaw; Load reduction
Main Research Area:
8th International Conference on Fluid Power Transmission and Control , ICFP 2013