Circulating current control of double converter system for wind power generation

This paper investigates advantages of new double converter system with the induction generator for wind power generation. The PFC converter and the voltage source converter are used. The voltage source converter controls the exciting voltage and frequency to generate the maximum power of the induction generator. The voltage source converter supplies the reactive power only. All real power from the induction generator is converted with the PFC converter. The rating of the voltage source converter becomes larger because of the circulating current through the double converter. It is necessary to suppress the circulating current. The investigation of the control strategy is performed by the theoretical analysis, the simulation, and experiment.