Method and device for operating a wind turbine

A device for a wind turbine having a rotor, the device comprising:

• a controller configured to execute a method, the method including the steps of:
• determining a value of a wind speed of an incident air mass at the wind turbine;
• if the determined value of the wind speed is greater than a first threshold value for the wind speed:
• reducing a rotational speed of the rotor of the wind turbine, and
• maintaining or increasing a generator torque acting upon the rotor;
• if the determined value of the wind speed is greater than a second threshold value for the wind speed, the second threshold value being greater than the first threshold value:
• reducing the rotational speed of the rotor, and
• reducing the generator torque acting upon the rotor.

A method for operating a wind turbine, the method comprising the steps of:

• determining a value of a wind speed of an incident air mass at the wind turbine;
• performing the following steps when the determined value of the wind speed is greater than a first threshold value for the wind speed and less than a second threshold value for the wind speed:
• reducing a rotational speed of a rotor of the wind turbine, and
• maintaining or increasing a generator torque acting upon the rotor;
• and,
• performing the following steps when the determined value of the wind speed is greater than the second threshold value for the wind speed, the second threshold value being greater than the first threshold value:
• reducing the rotational speed of the rotor, and
• reducing the generator torque acting upon the rotor.