Method and control device for a wind turbine, and computer program product, digital storage medium and wind turbine

A method of operating a wind power installation, the method comprising:

• applying a braking operation on a rotor of a generator of the wind power installation;
• continuing the braking operation until the rotor gets to a predetermined end position;
• and
• stopping and fixing the rotor at the predetermined end position by using a mechanical fixing device configured to fix the rotor at the predetermined end position,
• wherein stopping the rotor at the predetermined end position comprises using a latching moment of the generator for stopping the rotor at the predetermined end position,
• wherein the predetermined end position of the rotor is predetermined by predetermining an angular position of the rotor and associating the angular position with a latching position of the generator,
• wherein the predetermined end position is determined by a discrete latching scale over an angle division on the generator that is predetermined by an arresting groove distribution or pole distribution over a generator ring of the generator,
• wherein an arresting position distribution is matched to the pole distribution or the arresting groove distribution in such a way that an arresting position of the arresting position distribution coincides with the latching position governed by the latching moment of the generator rotor, and
• wherein the mechanical fixing device is applied automatically, wherein stopping the rotor at the predetermined end position by the mechanical fixing device comprises engaging an arresting bolt in an arresting hole or groove.