A controller for controlling a wind power generation device including a tower and a nacelle includes: a processing circuit configured to control a motor for rotating the nacelle relative to the tower; and a torque information sensor for sensing information about a torque acting from the nacelle to a gear mechanism, the gear mechanism connecting the tower and the nacelle so as to be capable of relative rotation. The processing circuit drives the motor based on a sensing value of the torque information sensor.

A device may receive historical operational data for a mechanical system, such as a rotor blade of a wind turbine. The device may determine one or more quality grades for each of one or more materials of the system, e.g., the rotor blade. The one or more quality grades may be determined by using a data model to process the historical operational data. The data model may be trained using machine learning based on one or both of historical operational data for similar systems, e.g., other rotor blades, and end-of-life (EOL) testing data for the same. The device may determine a recycling recommendation based on the one or more quality grades. The recycling recommendation may include instructions relating to recycling the one or more materials. The device may deliver the recycling recommendation to another device or recipient.

A wind power generation device control system includes: a blade wind detecting device for detecting at least one of a wind direction or a wind speed on at least one blade of a wind power generation device; and a blade control device for controlling at least one of (i) a pitch angle of the at least one blade or (ii) a yaw angle of the wind power generation device, based on at least one of the wind direction or the wind speed detected by the blade wind detecting device.

In one aspect, a method for validating a wind power installation or a component thereof is disclosed. The wind power installation has an aerodynamic rotor with a plurality of rotor blades that sweep through a rotor area. For at least one of the rotor blades, an individual blade performance capability and/or an individual blade power is/are determined in each case from recorded operating data relating to the wind power installation. The individual blade performance capability describes a capability of a rotor blade to convert power from wind into a partial rotational power for rotating the rotor, and the individual blade power denotes an amount of power that is converted by the respective rotor blade from the wind into a partial rotational power for rotating the rotor. The sum of the individual blade powers of all rotor blades of the rotor is a total rotational power of the rotor.

A method of determining a value of a stress related quantity of a rotor blade of a wind turbine is provided, the method including: emitting a primary radar signal towards a portion of the blade; receiving a secondary radar signal emanating from the blade due to interaction with the primary radar signal; analyzing at least the received secondary radar signal; and deriving, based on the analysis, the value of the stress related quantity as related to or indicating a blade acceleration and/or a first temporal derivative of the blade acceleration and/or a higher temporal derivative of the blade acceleration.

According to an embodiment, the method is for operating a wind turbine having a rotor with at least one rotor blade and a setting system which is configured to change the operation of the wind turbine. The method includes a step in which first trigger information is provided, wherein the first trigger information is representative of whether the torsional movement of at least one rotor blade exceeds a threshold. If this is the case, a first output signal is generated which is configured to cause the setting system to change the operation of the wind turbine in order to reduce the torsional movement of the at least one rotor blade.

A method and system of fatigue testing a wind turbine blade using a test system. The test system includes a test stand to which the wind turbine is fixed. A first excitation unit is connected to the wind turbine blade and used to introduce loadings in the flapwise direction. A second excitation unit is connected to the wind turbine blade and used to introduce loadings in the edge wise direction. A load controllable unit is further connected to the wind turbine blade and used to adjust the resonant frequency of the test system. Loadings in the flapwise and edgewise directions are introduced at the same resonant frequency and the loadings are measured using a number of detector units. The control unit monitor and control the amplitude of the first and second harmonic motions and the phase between the first and second harmonic motions.