Abstract
The overcurrent and overvoltage of the rotor side converter are mainly caused by the transient component of the stator flux under the grid symmetrical fault. A virtual transient flux linkage control method is proposed in this paper, which is based on the analysis of the electromagnetic transient characteristics of doubly fed induction generator (DFIG). Compared with the traditional demagnetization control method, the proposed method does not require the flux linkage observation, extraction and fault switch module. Simulation results show that the rotor voltage could be effectively limited and the transient process can be shortened, and the capability of low voltage ride through (LVRT) of the DFIG is enhanced with the proposed method.
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