电动汽车充电设施的接入对电网稳态运行影响分析

Impact of electric vehicle charging facilities on power grid steady state

为满足电动汽车运行控制和变电站继电保护动作阀值修订的需求,分析了电动汽车充电设施接入对电网稳态运行的影响。首先,介绍常见电动汽车充电设施及其充电特性;其次,分析并得到交流充电桩接入对电网稳态运行的影响;然后,计算并分析专变方式下充电站充放电工作对电网最大电压偏差和线损率的影响,以及专线方式下充电站放电工作对电网短路电流和供电范围的影响,并根据此分析结果给出变电站继电保护动作阀值的修订建议;最后,分析并得到电池充换站充放电工作对电网中变电站供电范围、短路电流和峰谷差率的影响。

Reasonable planning about charging facilities of electric vehicle （EV） has become an important research topic among power system researchers around the world. The impacts of EV charging facilities on the steady state of power grid are analyzed in order to meet the requirements of EV charging facilities operation control and substation relay protection operation. Firstly, common EV charging facilities and their power characteristics are introduced. Secondly, the impacts of AC charging spots on the steady state of distribution network are analyzed. Then, the im- pacts of the EV station charging operation on the maximum voltage deviation and line losses ratio of distribution net- work are calculated and analyzed, also the impacts of discharging EV charging station on the short circuit current and supplying area of power grid are analyzed, and substation relay protection acting threshold revised strategies are proposed according to these analyzed results. At last, the impacts of battery swap and charging station on the substation supplying area, short circuit current and peak-valley ratio are analyzed. All these results provide a theoretical reference for the charging facilities operation control and suggestions for revising the substation relay protection action threshold.