Patent ID: 8618685
Filing Date: 2013-12-31
Classification: F03D,F05B,Y02E

Abstract:
1. A method for operating a wind turbine in the event of a grid error, wherein the wind turbine has a rotor having at least one rotor blade which can be adjusted in its blade pitch angle, a generator connected to the rotor for the generation of electrical power (P) and at least one unit for capturing an actual value of the rotational speed of the generator (n a ), a value for the blade pitch angle (β a , β s ) and an actual value of a variable which is representative of a generator torque (M G ), said method comprising the steps of: recognizing a grid error; capturing an actual value of the variable representative of the generator torque (M determining a change in the generator torque (ΔM capturing the value for the blade pitch angle β determining a corrective value for the blade pitch angle in dependence upon the change of the generator torque (ΔM determining a corrected set-point for the blade pitch angle which results from a rotational speed dependent set-point for the blade pitch angle during a regular operation and the determined corrective value for the blade pitch angle.