1.Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network, Wuhan 430072, China;2.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;3.Electric Power Research Institute of China Southern Power Grid Company Limited, Guangzhou 510663, China;4.Guangdong Provincial Key Laboratory of Intelligent Measurement and Advanced Metering of Power Grid, Guangzhou 510663, China;5.Zhaoqing Power Supply Bureau of Guangdong Power Grid Co., Ltd., Zhaoqing 526060, China

To address the problem of inertia insufficiency in microgrids due to the integration of renewable energy sources, an inertial power control strategy for charging stations in collaboration with renewable energy generation is proposed. First, considering that electric vehicles (EVs) have good flexible regulation potential, they are treated as the generalized energy storage at the charging station level to provide power response capability for the controller. Then, the control strategy of virtual-inertial power compensation is proposed in reference to the rotor operation characteristics of virtual synchronous generator (VSG), which can cooperate with renewable energy generation to provide frequency support. Finally, the corresponding simulation model is built on MATLAB/Simulink for verification. The simulation results show that the proposed control strategy of virtual-inertial power compensation can effectively make use of the regulation potential of charging stations to provide inertia support power to the system, so as to improve the frequency stability of the system.

This work is supported by China Southern Power Grid Company Limited (No. 031200KK52222008) and National Natural Science Foundation of China (No. 51977154).