中文摘要：

基于混合储能的电动汽车充电站直流微网协调控制技术的研究对于维持直流微网母线电压的稳定、提高微网系统的经济效益都具有重要意义。提出了以飞轮和蓄电池混合储能作为光储充电站直流微网系统的储能形式,其中飞轮用于平滑高频功率波动和部分低频功率,蓄电池用于平衡基准功率以维持母线电压平滑稳定。并设计了直流母线5层电压（分层）协调控制策略,实现了微网系统中光伏发电、电动汽车充放电、负荷功率需求的协调控制。针对孤岛运行和并网运行中的5种不同工况,在Matlab/Simulink软件平台上对所提出的控制策略进行了仿真分析。仿真结果表明,在所有工况下,所提控制策略都能使直流母线电压在不同电压层间有效切换,维持光储充电站直流微网系统的直流母线电压平衡,实现了整个系统的灵活、可靠运行,因此该控制策略具有可行性和有效性。

英文摘要：

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.