Abstract
Injection of both positive and negative sequence currents is desirable for three-phase voltage source converters under unbalanced grid fault condition. However, the 2nd order oscillation exists in the positive and negative sequence synchronous reference frame. Several approaches have been reported to cope with this 2nd order oscillation. In this paper, a simple yet efficient control method in double synchronous reference frame (DSRF) is proposed. The proposed method does not need additional filter or decoupling circuit, and does not require signal reconstruction for the current reference. Theoretical analysis and simulation study show that the proposed control method not only achieve zero steady state error, but also exhibits faster transient response. Experimental results verify the performance of the proposed current control method in DSRF.
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