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Abstract

Adjusting pitch of the wind turbine rotor blades to reduce fatigue of the wind turbine tower. Flap loading sensor data is received for the rotor blades, and a flap loading vector in a rotor coordinate frame of the wind turbine is obtained. The flap loading vector is transformed to obtain first and second mutually orthogonal components in a fixed wind turbine coordinate frame, and respective 3P (blade passing frequency) components in the fixed frame indicative of 3P frequency content of the wind turbine tower are determined. A control action is applied to obtain respective 3P control components for mitigating the 3P frequency content of the tower, an inverse transform is applied to the 3P control components to obtain pitch reference offset values for the respective rotor blades in the rotor coordinate frame, and blade pitch is adjusted based on the pitch reference offset values.

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