电动汽车（electric vehicle，EV）充电站利用其剩余无功功率容量向电网提供辅助服务，既能帮助电网实现自动电压控制（automatic voltage control，AVC），也能为充电站带来额外的收益。因此，提出了EV充电站调压辅助服务的市场机制，建立了充电站内充电桩的电路拓扑结构，并分析了充电桩进行无功功率支撑的基本原理。在此基础上，利用概率统计学和蒙特卡洛法，考虑电动私家车、电动出租车各自对应的充电需求，分别模拟了其充电行为；并结合充电桩的功率约束和变压器容量约束，预测出了充电站日内负荷分布曲线；进而评估出充电站日内无功功率支撑能力，并计算出日内充电站参与调压辅助服务所取得的收益。对充电站内快充充电桩的相关参数进行灵敏度分析，体现出不同参数对应的EV充电站无功功率支撑能力的差异，为充电站申报参与调压服务容量并获取相关补偿收益提供技术分析手段。

Electric vehicle （EV） charging stations utilize their remaining reactive power capacity to provide auxiliary services to the power grid, assisting in achieving automatic voltage control （AVC） and generating additional revenue for the charging stations. In this paper a market mechanism for the voltage regulation auxiliary services of EV charging stations is proposed, the circuit topology of charging piles within the charging station is established, and the basic principles of reactive power support by charging piles are analyzed. Based on this, using probability statistics and the Monte Carlo method, considering the charging demands of electric private cars and electric taxis, the charging behaviors of each are simulated. Combined with power constraints of the charging piles and transformer capacity constraints, the daily load distribution curve of the charging station is predicted. Furthermore, the reactive power support capability of the charging station within a day is evaluated and the revenue obtained from the participation of the charging station in voltage regulation auxiliary services within a day is calculated. Sensitivity analysis of relevant parameters of fast-charging piles within the charging station is conducted, highlighting the differences in reactive power support capabilities corresponding to different parameters of EV charging stations. This provides technical analysis tools for charging stations to declare their participation capacities in voltage regulation services and obtain relevant compensation benefits.