Patent ID: 9719493
Date: 2017-08-01
CPC Classifications: F03D,F05B,Y02E

Claim:
1. A method for dampening oscillations in a wind turbine, the wind turbine having a tower, a rotor arranged on the tower such as to be able to rotate about an X axis, and a plurality of rotor blades with adjustable pitch mounted on the rotor, the method comprising: monitoring a fore-aft oscillation of the tower in the direction of the X axis, at a 2 determining a compensating torque to be applied by the rotor to the tower of the wind turbine about a Y axis, which is horizontal and at right angles to the X axis, for at least partly dampening the oscillation at the 2 determining for each rotor blade an adjustment of a pitch angle suitable to generate the compensating torque about the Y axis; and adjusting the pitch angle of at least one of the rotor blades to generate at least part of the compensating torque.