Method And Control System For Reducing The Fatigue Loads In The Components Of A Wind Turbine Subjected to Asymmetrical Loading Of The Rotor Plane

A control system for reducing the fatigue loads in the components of a wind turbine subjected to asymmetrical loading of its rotor plane comprising:

• data collecting and storing means for repeatedly collecting and storing load data (MR) of the rotor,
• wind turbine control means for controlling the power capture of the wind turbine, and
• data processing means for processing said collected load data of the rotor of the wind turbine and providing a control output accordingly,
• where said data processing means being adapted to determine a load distribution (MF) function for the rotor from said stored load data, deriving and processing a plurality of periodic functions (MF{h}) on different multiple integers of the rotor frequency (wnom) from said load distribution function, determining actions, based on said plurality of periodic functions (MF{h}), for said wind turbine control means for reducing fatigue loads on the wind turbine components, and providing a control output accordingly to the wind turbine control means.