Voltage Imbalance Compensation for Doubly Fed Induction Generator Using Direct Resonant Feedback Regulator

This paper presents a resonant feedback regulator-based control strategy to compensate the point of common coupling (PCC) voltage imbalance for doubly fed induction generator (DFIG). The proposed control strategy utilizes a resonant compensator to directly generate the rotor voltage reference, rather than conventionally generating the negative sequence rotor current references. Thus, the sequence decomposition and DFIG parameter dependency can be avoided. Impacts of the resonant parameters and the network resistance/reactance (R/X) ratio on the control system performances, including the system stability, the rejection capability of the PCC voltage imbalance and the dynamic response of the control system, are theoretically analyzed. The experimental results validate the effectiveness of the proposed control strategy. The proposed voltage imbalance compensation strategy can be applied under any network R/X ratio condition.