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A Harmonic-Voltage Suppression Strategy for DFIG-Based Wind Turbines in the Islanded Mode

When doubly-fed induction generator (DFIG)-based wind turbines operate in the islanded mode, nonlinear loads may cause voltage distortion at stator side. A control method that can improve the quality of stator voltage is proposed in this paper. First of all, the mathematics model of DFIG is established in the fundamental frequency synchronous reference frame. Then, the proportion integration resonance (PIR) controller is designed for rotor side converter (RSC) to suppress the 5th and 7th harmonic components of stator voltage. Finally, the simulation results validate the effectiveness and advantages of the proposed control strategy.