Patent ID: 11905932
Assignee: SIEMENS GAMESA RENEWABLE ENERGY A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 4:
5. A control device configured to control blade instabilities of a wind turbine, the wind turbine comprising a rotor having a plurality of rotor blades, the rotor being mounted to a nacelle to rotate about a rotation axis with a rotor speed, wherein each blade is configured to be pitched by a pitch angle about a pitch axis of the blade, wherein,
the control device is configured to set a final overspeed threshold value to be equal to or smaller than a minimum rotor speed of at least one preliminary overspeed threshold value and a fluttering rotor speed, at and above which a predetermined fluttering of at least one of the blades occurs, the fluttering rotor speed is defined as a function of the pitch angle and/or as a function of the wind speed; and
the control device is configured to control the rotor speed to not exceed the final overspeed threshold value.