Control Strategy of Doubly-Fed Induction Generators Based on Stator Virtual Impedance in Microgrid

With the development of wind power generation research, a system of parallel double-fed induction generators in islanded mode of microgrid operation is established in this paper. Due to the difference between the equivalent output impedance and the transmission line impedance in a parallel system, it will cause the problem that the output reactive power cannot be shared equally. In order to solve this problem, this paper adds a virtual impedance control strategy based on the traditional droop control strategy to improve the accuracy of load sharing. Based on the theoretical analysis, the simulation results verify the effectiveness of the proposed control strategy.