The entire energy storage system consists of one subsystem, as shown in Figure 7-1. The topology diagram of the entire system consists of 352 battery boxes divided into 16 battery clusters, each consisting of 22 battery boxes. The system is composed of battery clusters,control cabinets, distribution cabinets, PCS, and energy management system (EMS). Figure 7-2 shows the schematic diagram of the energy storage system composition. The system is scheduled by EMS and detects load power according to the set mode, Realize battery dischargecontrol and charge the battery during valley time.