Patent ID: 7541686

Claim:
A wind power generation installation ( 1 ), comprising a rotor ( 4 ) mounted on a shaft which is rotatably supported, the rotor ( 4 ) including rotor blades ( 6 ) attached thereto, at least one generator ( 8 , 14 ) which is operably connected to the rotor ( 4 ) by way of a transmission ( 7 ); at least one electric machine ( 9 ) which is operable as a motor and which is operably connected to the rotor ( 4 ) via the transmission ( 7 ); and a control unit ( 18 ), wherein the electric machine ( 9 ) is controlled by the control unit ( 18 ) via which the torque applied by the at least one electric machine ( 9 ) to the transmission ( 7 ) is controllable, the transmission ( 7 ) includes a first transmission branch ( 12 ) which interconnects the rotor ( 4 ) and the generator ( 8 ), and a second transmission branch ( 11 ) which interconnects the rotor ( 4 ) and the electric machine ( 9 ) which is operable as a motor.