Abstract
In this paper, the behavior of doubly-fed induction generator (DFIG) under unbalanced grid voltage conditions is analyzed and a control strategy based on complex-vector-resonant regulator is proposed. Compared with the traditional PI regulator, the positive and negative sequence currents can be regulated without sequential-decomposition process and this control structure has strong robustness in parameter variations. Simulation and experimental studies validate the effectiveness of the proposed control strategy and ride-through capability of DFIG under unbalance grid voltage conditions can be enhanced.
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