Abstract This research is focusing on conducting partial equivalence method for the power grid which operates with voltage source converter (VSC) based on the virtual synchronous generator (VSG) control strategy.The feasibility of applying power grid equivalence method in VSC with synchronous generator power-angle characteristic features has been analyzed.Then, on the analogy of AC coherency-based method, a VSC type coherency criterion has been designed and a VSC parameter aggregation method based on virtual synchronous generator control has been put forward.Under PSCAD/EMTDC simulated environment, VSCs parallel operation model is built based on virtual synchronous generator control.This system is divided into internal area and external area.Based on the virtual power-angle curve after single-phase ground fault disturbance, the VSCs coherency is judged and divided them into different coherent groups.Each group is proceeded parameter aggregation respectively.Finally, the output curve of active and reactive power from external area to internal area is chosen as object.Based on comparing the output curve before and after equivalence, the error analysis result indicates that the power flow is invariant during the equivalence.This validates the correctness and effectiveness of the referred coherency equivalence method.
Li Chengyu,Xu Jianzhong,Zhao Chengyong等. Coherency Equivalence Method for Voltage Source Converter Based onVirtual Synchronous Generator[J]. Transactions of China Electrotechnical Society, 2016, 31(13): 111-119.
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2016, Vol. 31 
