VOLTAGE CONTROL FOR WIND TURBINES

摘要

The invention relates to a wind turbine having a rotor (12), a generator (14) driven by the rotor, a converter (15), and a control device (167), which has an input for a control signal for reactive power output and a controller (72) for the converter (15). The controller (72) determines a reactive power target value for the wind turbine and corrects the output reactive power in dependence on the voltage present at the wind turbine. The invention provides for an additional module (8) for the controller (72), which additional module has separate small and large signal paths (81, 82) and interacts with the controller (72) in such a way that the small signal path (81) has an additional storage element (83) in comparison with the large signal path (82), which additional storage element stores state values of the small signal path (81) for the past. Thus, small voltage changes can be reacted to more slowly and while taking into account past values, whereas large changes can be reacted to quickly, in particular in the event of a network short circuit.

主权项

1. A wind turbine comprising a rotor (12), a generator (14) driven thereby having a converter (15) and a control device (7), which has an input for a control signal for the reactive power output and a regulator (72) for the converter (15), which regulator is designed to calculate, locally, a reactive power setpoint value for the wind turbine from the control signal for the reactive power output, to detect the actually output voltage of the wind turbine and to correct the reactive power output by the wind turbine after comparison with the control signal,
characterized in that an additional module (8) for the regulator (72) is provided, which additional module has separate low-level and high-level signal paths (81, 82) and interacts with the regulator (72) in such a way that the low-level signal path (81) has an additional storage element (83) in comparison with the high-level signal path (82), which additional storage element stores state values of the low-level signal path (81) for the past.