Method for operating a wind turbine

A method for operating a wind turbine, wherein the wind turbine has a rotor having at least one rotor blade which can be adjusted in its blade pitch angle (β), a generator connected to the rotor for generating electrical power and at least one measurement unit for capturing an actual value of a variable representative of a rotational speed of the generator, wherein a set-point for a generator torque (MG) is provided as a function of a rotational speed (n) and the set-point is corrected as a function of a parameter for an air density (ρ), said method comprising the steps of:

• capturing an actual value of a variable representative of a rotational speed of the generator (nG);
• providing a set-point for the generator torque (MG) as a function of the captured actual value of the variable representative of the rotational speed of the generator (nG);
• correcting the set-point for the generator torque as a function of a parameter for the air density (ρ);
• capturing a value for the blade pitch angle (β);
• and,
• increasing the set-point for the generator torque (MG) when the captured value for the blade pitch angle (β) exceeds a predetermined minimum value (βmin) and the set-point for the generator torque (MG) has been corrected on the basis of the parameter for the air density (ρ).