Wind Turbine and Method for Controlling the Electrical Moment of a Wind Turbine by Closed-Loop Control in the Event of a Grid Fault

摘要

The invention relates to a method for controlling the electrical moment of a wind turbine by closed-loop control in the event of a grid fault. A fall in voltage that is outside the limits of normal operation is discovered. A moment closed-loop controller which determines a target value for the electrical moment of the wind turbine, is operated. A moment ramp is initialized. The target value of the moment closed-loop controller is compared with the moment ramp and the lesser value is selected as a moment setpoint value. The electrical moment of the wind turbine is set on the basis of the moment setpoint value. The invention additionally relates to a wind turbine suitable for implementing the method. The invention makes it possible, on the one hand, to achieve a rapid restoration of the power after the end of the grid fault, while, on the other hand, the loads for the wind turbine are kept within limits.

主权项

1. A method for controlling the electrical moment of a wind turbine by closed-loop control in the event of a grid fault, comprising the following steps:
a. discovering a fall in voltage that is outside the limits of normal operation; b. initializing a moment ramp (31); c. comparing a target value (52) of a moment closed-loop controller (26, 27) with the moment ramp (31); d. selecting the lesser value from step c. as a moment setpoint value (35); and e. setting the electrical moment of the wind turbine on the basis of the moment setpoint value (35).