In order to research the impact of Electric Vehicle (EV) charging station location on voltage stability of power grid, an analysis method based on electric betweenness is proposed. The variation of system voltage distribution after respectively connecting the high electric betweenness and low electric betweenness nodes into EV charging station is quantitatively analyzed, and then the impacts of electric betweenness on voltage stability are discussed based on voltage stability margin index of PV curve. It finds that node electric betweenness is in direct proportion to its capacity of absorbing new loads, the nodes with higher electric betweenness can bear greater range of voltage variations when the same quantity of load is increased, and the system voltage stability is much better. Simulation results show that EV charging station locating on higher electric betweenness node is helpful for absorbing new charging load, enhancing load level of all level, maintaining system voltage stability, and reducing the risk of voltage collapse.%为研究电动汽车充电站选址对电压稳定性的影响,提出一种基于电气介数的分析方法.通过定量分析充电站接入高电气介数和低电气介数节点后系统电压分布的变化,结合基于 PV 曲线的电压稳定裕度指标探讨了电气介数对系统电压稳定性的影响.研究发现节点的电气介数越大其消纳新增负荷能力越强,增加等量负荷的条件下,电气介数越大的节点承受电压变化的范围更大,系统的电压稳定性越好.仿真结果表明,充电站选址于高介数节点有助于消纳新增的充电负荷,提升全网的负荷水平,维持系统的电压稳定,降低发生电压崩溃的可能.
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