Method for controlling a wind power installation

A method comprising:

• controlling a wind power installation having a plurality of rotor blades,
• wherein:
• the plurality of rotor blades have adjustable blade angles,
• the wind power installation is configured to be operated at a variable speed using speed control,
• the controlling of the wind power installation comprises:
• controlling the speed control to a variable target speed value,
• the controlling of the speed control comprises:
• evaluating a test criterion for predicting an overspeed,
• predicting the overspeed based on the test criterion, and
• changing the speed control if the overspeed has been predicted,
• the changing of the speed control includes increasing a controller gain of the speed control if the overspeed has been predicted, and
• the speed control works in such a way that a speed deviation defining a difference between the variable target speed value and an actual speed value leads, via the speed control, to a planned blade angle of at least one of the adjustable blade angles or a planned adjustment rate of at least one of the adjustable blade angles.