Patent ID: 7279802
Filing Date: 2007-10-09
Classification: F03D,F05B,Y02E

Abstract:
1. A method for reducing mechanical oscillation in a wind power plant, the method comprising: determining a wind speed; controlling a generator of the power plant with a speed control when the wind speed is below a predefined wind speed limit to maintain a rotation speed of the generator below a predefined first rotation speed limit; detecting an increase of the wind speed above the predefined wind speed limit; controlling a torque of the generator with torque control by using a predefined crossover torque in response to the wind speed increasing above the predefined wind speed limit; maintaining the torque control to control the torque of the generator using the predefined crossover torque until the rotation speed of the generator has increased above a predefined second rotation speed limit; and controlling the generator with torque control while the rotation speed of the generator remains above the predefined second rotation speed limit.