提出网格选取法，在保证变压器不过载运行的同时，灵活规划电动汽车的充电时段。进而基于峰谷分时电价构建了充电电费支出最小的目标函数，并基于遗传算法设计了求取最优网格选取结果的方法与步骤(A grid selection method is proposed to flexibly plan the charging time of electric vehicles while ensuring that the transformers are not in operation. Then, ba