the proportional filter 28 the controller is insensitive to the oscillations of the power train at the same time time constants of the differentiating member 32 are selected such that a slow regulation takes place switch 43 has no effect in this type of operating the wind power plant works with closed switch 44 i e rotor blades with large rotor blade lengths are used if the actual value 10 of the generator speed is below the predetermined threshold value 42 the output of the first differentiating member 36 is fed over switch 43 and the first controller branch with the differentiating members 36 38 contributes to the controller result in this state the second controller branch 26 also delivers a result via the controller output 18 the series connected differentiating members 36 38 allow the selection of time constants which permit a fast regulation in particular for switching the wind power plant to the network in which the regulation of the speed only takes place via the pitch controller since the first controller branch is independent of the filtered values of the proportional filer 28 a direct regulation takes place here which permits in this working range a reliable and fast compensation of oscillations of the generator speed the wind power plant works with closed switch 44 if the wind power plant is equipped with long rotor blades if the actual value 10 of the generator speed is higher than the.