说明：  实现了蓄电池的并网，其中包含了蓄电池模型、四象限变流器模型和控制器模型，控制器控制有功无功，实现蓄电池和交流系统间的功率交换
(which contains the battery model, four-quadrant converter model and the controller model, the controller controls the active and reactive power to achieve the battery and AC power exchange between systems.)