Patent ID: 8482143

Claim:
A method for controlling the rotational speed of a wind turbine having a tower, a nacelle mounted on the tower and a drive train which includes a rotor having at least one rotor blade, the rotor being rotatably mounted about a rotor axis in the nacelle, and a generator configured to be driven by the rotor; the method comprising the steps of: in a nacelle-fixed reference system, measuring the rotational speed (ω G *) of an element of the drive train which rotates with the rotor in correspondence to a transmission ratio (Ue); measuring a movement of the nacelle relative to the ground; controlling the rotational speed to a rotational speed setpoint with a speed controller which outputs a generator torque (M G ) and/or a blade pitch angle (θ); converting the rotational speed (ω G *) into a corrected rotational speed (ω GC ) which corresponds to the rotational speed of the rotor in a ground-fixed reference system multiplied by the transmission ratio (Ue); and, using the corrected rotational speed (ω GC ) as the input quantity for the speed controller.