Method for operating a wind turbine, control system for operating a wind turbine and wind turbine

A control system for operating a wind turbine having a rotor with a rotor blade and a rotor speed setting system for setting a speed of rotation of the rotor, the control system comprising:

• a sensor system configured to take measurements via which it is determinable whether an edge-wise movement of the rotor blade exceeds a threshold while the rotor is rotating;
• a control device including a processor and a non-transitory computer readable medium having instructions stored thereon;
• said instructions being configured, when executed by said processor, to:
• determine first information which is representative for whether the edge-wise movement of the rotor blade exceeds the threshold while the rotor is rotating, and,
• if the edge-wise movement of the rotor blade exceeds the threshold while the rotor is rotating, generating an output signal configured to cause the rotor speed setting system to change the speed of rotation of the rotor without stopping the rotation of the rotor in order to reduce the edge-wise movement of the rotor blade;
• said control device being signally connectable to said sensor system in order to provide said control device with the measurements of said sensor system;
• and,
• said control device being signally connectable to the rotor speed setting system in order to provide the rotor speed setting system with the output signal of said control device so that the rotor speed setting system controls the speed of rotation of the rotor depending on the output signal.

A wind turbine comprising:

• a rotor having a rotor blade;
• a rotor speed setting system for setting a speed of rotation of said rotor;
• a sensor system configured to take measurements via which it is determinable whether an edge-wise movement of the rotor blade exceeds a threshold while said rotor is rotating;
• a control device including a processor and a non-transitory computer readable medium having instructions stored thereon;
• said instructions being configured, when executed by said processor, to:
• determine first information which is representative for whether the edge-wise movement of said rotor blade exceeds the threshold while said rotor is rotating, and,
• if the edge-wise movement of said rotor blade exceeds the threshold while said rotor is rotating, generating an output signal configured to cause said rotor speed setting system to change the speed of rotation of said rotor without stopping the rotation of said rotor in order to reduce the edge-wise movement of said rotor blade;
• said control device being signally connectable to said sensor system in order to provide said control device with the measurements of said sensor system;
• and,
• said control device being signally connectable to said rotor speed setting system in order to provide said rotor speed setting system with the output signal of said control device so that said rotor speed setting system controls the speed of rotation of said rotor depending on the output signal.