Method for determining a blade misposition of a rotor blade of a rotor of a wind power installation through azimuthal movement

A wind power installation, configured to determine a blade misposition of a rotor blade of a rotor of the wind power installation having multiple rotor blades with an adjustable blade angle, the wind power installation comprising:

• a nacelle having a rotor and an azimuth adjustment device, the azimuth adjustment device having at least one activable azimuth actuator in order to adjust an azimuthal position of the nacelle;
• a detection device configured to detect an azimuthal movement of the nacelle while the at least one azimuth actuator of the detection device is inactive;
• and
• a computing unit configured to determine the blade misposition on the basis of the azimuthal movement detected in the detection,
• wherein the blade misposition describes a blade angle variance of the blade angle of the rotor blade from a reference blade angle, and
• wherein a circumferential rotational position of the rotor is referred to as the rotor position,
• wherein a recorded azimuth response is evaluated by recording an integral over the recorded azimuth response, and
• wherein the integral is used to determine an amplitude of an assumed sinusoidal azimuth response.