Patent ID: 8162608
Filing Date: 2012-04-24
Classification: F03D,F05B,Y02E

Abstract:
1. A method of reducing loading acting on a wind turbine yaw system due to yawing moments induced to the yaw system by a rotor having a rotor blade with a pitch control system, comprising: determining the yawing moment induced to the yaw system by the rotor; and setting a pitch of the rotor blade based on the detected yawing moment such that the determined yawing moment is reduced, wherein the yawing moment is determined from a yaw system observable, wherein the yaw system is aligned by providing torques by a plurality of yaw drives where the torques act in opposite directions, and the yawing moment induced to the yaw system is determined by determining a difference between the torques provided by the yaw drives in order to keep the yaw system aligned.