Large amount of electric vehicles accessed to power grid have brought certain impact on the safe operation of power system.The configuration ratio of charging facilities and electric vehicles will decide the further promotion of electric vehicles.According to the development plan of electric vehicle in Hanzhong city,the holding capacity of 3400 electric vehicles in Hanzhong city by the end of 2020 is taken as research sample.The charging load models are presented respectively under the charging modes of slow charging and fast charging.Monte Carlo simulation is used to forecast the total charging load profiles of electric vehicles.The configuration ratio of charging equipment and electric vehicles is calculated according to the maximum number of electric vehicles under charging during one day.The results show that under the slow charging mode,the total power demand for a certain scale of electric vehicles is higher,but under the fast charging mode,the demand for charging facilities is less and the utilization rate is higher.%大批量电动汽车接入电网充电给电力系统安全运行带来一定影响,充电设施与车辆数的配比度是决定电动汽车进一步推广的关键要素.根据汉中地区电动汽车发展预测数据,将2020年末汉中市3400辆电动汽车的保有量作为研究样本,分别建立了慢充和快充模式下的充电负荷概率模型,采用蒙特卡罗模拟法预测了2种模式下的总体充电负荷曲线.根据1天内最大在线充电汽车数量得出快充模式下充电设施与车辆数的配比度.结果表明,一定规模的电动汽车采用慢充模式时电力需求较大;采用快充模式时充电设施需求量较小且利用率较高.
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