DiffTune-PI Based Vector Control of Doubly Fed Induction Generator for Grid-Connected Operation

Due to the unstable feature of wind energy, fixed parameter control cannot adequately meet the demand of doubly fed induction generator (DFIG) system for wind power generation. In this paper, for the control of DFIG under grid-connected operation conditions, a vector control method with stator voltage orientation based on DifITune- PI algorithm is proposed. The control parameters of the PI controller are optimized online by the DifITune algorithm and the disturbance term is compensated through feed-forward compensation. Simulation results show that the proposed method can effectively suppress the power and voltage fluctuations of the DFIG system under grid-connected operation conditions with excellent dynamic and static performances when generator starts, the grid voltage drops and the input wind speed decreases.