Patent ID: 8878378

Claim:
A method for operating a pitch-controlled wind turbine having at least one rotor blade adjustable about its longitudinal axis to define a pitch angle (φ), and having a generator wherein a set-point for a generator torque (M) is specified in dependence upon a rotational speed (n) of the generator or of the rotor, and wherein a transition point (n 3 , M 3 ) is provided whereat there is a switchover from a part-load operation to a full-load operation, the method comprising the steps of: determining a value for an air density (ρ); and, setting said pitch angle (φ) to a pre-pitch angle (φ pre ) starting at a pre-pitch rotational speed (n 4 ) which is below the rotational speed (n 3 ) at said transition point (n 3 , M 3 ) with said value of said pre-pitch angle (φ pre ) being dependent on said value determined for said air density (ρ) so as to cause a larger pre-pitch angle to be set when said air density is lower than when said air density is higher.