Research on control strategy of PQ mode virtual synchronous generator with autonomous voltage regulation function

The virtual synchronous generator reactive voltage regulation strategy running in PQ mode usually adopts droop control, and its outer loop control directly accepts the reactive power command of AVC in the station to realize the voltage tracking control of the station, but is limited by the automatic voltage control (AVC) period control characteristics in the station. When the voltage fluctuates abnormally, it is unable to respond to voltage fluctuations quickly and increase the risk of wind turbine disconnection failure. This paper proposes a VSG control strategy for automatic reactive power compensation with abnormal voltage fluctuations. The principle analysis of the control method and the specific parameter setting principle are given, so that it can follow the stable operation of the AVC reactive command in the station in steady state, and respond to the voltage change autonomously in the transient state. Finally, a wind farm simulation model is built to verify the correctness and feasibility of this control strategy.