US 2012/0056427 A1 · METHOD FOR CONTROLLING THE ROTATIONAL SPEED OF A WIND TURBINE

Abstract

A method controls 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 is rotatably mounted about a rotor axis in the nacelle. The drive train further includes a generator configured to be driven by the rotor. In a nacelle-fixed reference system, the rotational speed (ωG*) of a component of the drive train which rotates with the rotor in correspondence to a transmission ratio (Ue) is measured. A movement of the nacelle relative to the ground is measured and the rotational speed is controlled to a rotational speed setpoint with a speed controller which outputs a generator torque (MG) and/or a blade pitch angle (θ). The measured rotational speed (ωG*) is converted into a corrected rotational speed (ωGC) which corresponds to the rotational speed of the rotor in a ground-fixed reference system multiplied by the transmission ratio (Ue). The corrected rotational speed (ωGC) is used as the input quantity for the speed controller.

Claims16

Dependent claims

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 (ωG*) 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 (MG) and/or a blade pitch angle (θ);
converting the rotational speed (ωG*) into a corrected rotational speed (ωGC) 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 (ωGC) as the input quantity for the speed controller.

4 more elements

A wind turbine comprising:

a tower;
a nacelle mounted on said tower;
a drive train including a rotor and a generator configured to be driven by said rotor;
said rotor having at least one rotor blade and being rotatably mounted about a rotor axis in said nacelle;
a first measuring unit configured to measure a rotational speed (ωG*) of an element of said drive train which rotates with said rotor in correspondence to a transmission ratio (Ue);
a second measuring unit configured to measure a movement of said nacelle relative to the ground;
a speed controller configured to control the rotational speed to a speed setpoint by outputting at least one of a generator torque (MG) and a blade pitch angle (θ);
a converting unit configured to convert said rotational speed (ωG*) into a corrected rotational speed (ωGC) which corresponds to said rotational speed of said rotor in a ground-fixed reference system multiplied by said transmission ratio (Ue);
and,
said speed controller being connected to said converting unit in such a manner that said speed controller uses said corrected rotational speed (ωGC) as an input quantity.

7 more elements

Dependencies are inferred from the claim text.

Method for controlling the rotational speed of a wind turbine

Life of this patent

Method for controlling the rotational speed of a wind turbine

Life of this patent

Abstract

Claims16