Patent ID: 8415817

Claim:
A wind farm comprising: a wind turbine having a rotor mechanically coupled with a wind turbine generator for transforming mechanical power into electrical power, the generator comprising a generator output for putting out the electrical power; a wind farm output node adapted to electrically couple the wind farm with a utility grid; a converter having an electric motor with a stator and a rotor and a converter generator with a stator and a rotor, the stator of the motor is electrically coupled with the generator output and the stator of the converter generator is electrically coupled with the wind farm output node, and the rotor of the motor and the rotor of the converter generator are mechanically coupled to each other; and a control device connected to the electric motor and/or the converter generator and configured to produce control signals based on a request set value relating to the electrical power to dynamically control at least a reactive power to be output from the wind farm output node, and to output the control signals to the electric motor and/or the converter generator to control said reactive power by way of a controlled energizing current supplied by the control device to the rotor of the converter generator.