In view of vehicle to grid(V2G),targeting the problems of battery damage caused by the deep charging and discharging of electric vehicle(EV)and the bus voltage fluctuation caused by the power change in DC microgrid,the paper proposes a hierarchical control strategy with primary control and secondary control for EV charging station based on V2G technology.The primary control layer is used to achieve the charge balance between EVs based on the improved droop control of the state of charge of EV.The secondary control layer introduces the state factor λincluding EV output voltage and power information.The controller generates voltage compensation by local calculation to modify the reference output voltage of the charging station,realizing rapidly power equalization and DC bus voltage balance.The corresponding simulation model is built on Matlab/Simulink to verify the feasibility and effectiveness of the proposed control strategy.
关键词
直流微电网/电动汽车/V2G技术/SOC均衡/电压恢复/功率分配
Key words
DC microgrid/EV/V2G technology/SOC equalization/voltage recovery/power distribution
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