Method for operating a wind energy plant in the event of a grid fault and such a wind turbine

摘要

A method of operating a wind turbine upon the occurrence of a line fault, wherein the wind turbine comprises a rotor having at least one blade pitch adjustable in its pitch, an electric power generator connected to the rotor, and at least one means for detecting an actual speed of the generator, a value of the blade pitch and an actual value of a magnitude representative of a generator torque, comprising the steps of: detecting a network fault, detecting the actual value of the generator torque representative magnitude, and the generator speed if a network fault was detected, determining a generator torque change • detecting the value of the sheet pitch angle, • determining a sheet pitch correction amount depending on the generator torque change and the sheet pitch value, • determining a corrected pitch sheet setpoint setpoint, which results from a speed-dependent setpoint value for the sheet pitch angle in a regular operation and the determined correction parameter for the sheet pitch angle.