It is described a method for controlling the operation of a wind turbine (120) which comprises a mechanical drive train (222, 228), an electric generator (230) being mechanically connected to the drive train (111, 228), and a power converter (240) being electrically connected to the generator (230). The method comprises (a) determining a frequency of an AC output voltage signal provided by the power converter (240); (b) recognizing, whether there has been a modification of the determined frequency with respect to a previously determined frequency, which modification is larger than a given threshold; (c) if the modification of the determined frequency is larger than the given threshold, changing a power reference signal for the wind turbine (120); (d) providing the changed power reference signal to a controller (250) of the wind turbine (120); and (e) controlling the operation of the wind turbine (120) on the basis of the changed power reference signal. Further, it is described a wind turbine being capable of carrying out this wind turbine control method and a method for controlling an overall power generation of a plurality of wind turbines of a wind park.
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