Loss reduction methods for doubly-fed induction generator drives for wind turbines

This paper deals with control techniques for reduction of the losses in doubly-fed induction generator drives. This type of machine is one of the most used in wind power. The proposed method achieves its goal through controlling the decoupled active and reactive power flow on the machine and on the converters. Depending on the operating point and on the desired power factor optimal reactive currents are imposed and the electrical losses are reduced. The theoretical base as well as experimental results are presented