It is important to research DC microgrid coordination control technology of electric vehicle charging station based on hybrid energy storage for maintaining the stability of DC bus voltage and improving the economic benefit of microgrid system.Consequently

we put forward that the hybrid energy storage of flywheel and battery was adopted as the energy storage type of PV charging station based on DC microgrid

the flywheel was used for smoothing high frequency power fluctuations and some low frequency power

and the battery was used for balancing the reference power to keep the bus voltage smooth and stable. Moreover

the control strategy of the five-layer voltage（layered） of the DC bus was designed

and the coordination control was realized in the microgrid system of PV power generation

electric vehicle charging/discharging

and load power demand. For five different conditions of isolated island operation and grid-connected operation

the proposed control strategy was simulated and analyzed on the Matlab/Simulink software platform. The simulation results show that

under all operating conditions

the control strategy can make the DC bus voltage between the different voltage layers to effectively switch

maintain the DC bus voltage of PV charging station based on DC microgrid balance

and realize the flexible

reliable operation of the whole system. Therefore

the proposed control strategy is feasible and effective.