光储式充电站基于SOC的改进型准PR下垂控制研究

针对光储式电动汽车充电站以DG形式接入微电网的情况,提出了一种基于SOC的改进型功率耦合下垂控制,在系统孤岛运行时,能根据充电站储能系统SOC的变化,改善充电站与其他DG之间的功率分配;在微电网并网/孤岛双模式切换时,结合相应的并网输出功率的改变和预同步控制,来实现双模式切换的平滑过渡。在逆变器的双环控制中,电压外环采用准PR控制,电流内环采用比例P控制,实现对参考信号的快速跟踪和无差控制。最后,基于MATLAB/Simulink针对不同工况对控制策略进行了对比研究,仿真结果表明,所提出的改进型下垂控制能实现充电站向电网方向放电的灵活有效控制。

Improved quasi PR droop control of charging station with PV energy storage based on SOC

In the situation of the photovoltaic-energy-storage electric vehicle ( EV) charging station con-nected into the power micro grid as a distributed generation(DG), a power coupling based on state-of-charge ( SOC) improved droop control was proposed, which improves power allocation within charging stations and other DGs according to the SOC change of the charging station, with system running in a lonely island mode; switching in micro grid on-grid and off-grid dual modes, smooth transition realized combined with the corresponding change of on-grid power output under PQ control and pre-synchroniza-tion of droop control. Quasi PR control used to track the reference signal fast and no errors for voltage in-side controller. Finally, based on MATLAB/Simulink, the improved droop control was carried on the contrast research in different situations, and the simulation results of which verify feasibility and validity of control strategy.