A method for operating a wind turbine comprises capturing an actual value of a fed-in power (Pact) and determining a power deviation based on the captured actual value of the fed-in power (Pact). A signal value is set for a correction of a setpoint value for the rotor blade pitch angle when one of the power deviation exceeds a predetermined maximum value and the power deviation exceeds a maximum gradient threshold value over a specified period of time. The signal value is cleared when one of the power deviation falls below a predetermined minimum value and a grid voltage value is located in a predetermined band around a specified target voltage value. A correction value (dβ/dt*) is determined for the setpoint value of the rotor blade pitch angle depending on the power deviation and applied to a rotor blade pitch control when the signal value is set.