The battery management system (BMS) is the most important control link in the energy storage system. On the one hand, the BMS system protects, monitors, measures, and maintains the battery cells; on the other hand, the BMS system performs data transmission, command reception, log storage, and power interactive control. These functions are the bridge and interface of interaction between micro-grid, monitoring & PCS and the battery. Therefore, the BMS system is the most critical link between the entire energy storage control system and the battery. The PRS-7550 battery management system of CYG SUNRI is mainly used in large-scale energy storage containers and indoor energy storage projects, and it generally forms a complete energy storage system with PCS and EMS. Due to its various functions such as protection, measurement, monitoring, and communication, it is the most important cornerstone in the energy storage control system and bears important responsibilities such as battery maintenance and safe use.

The PRS-7564 intelligent grid-connected and off-grid switching cabinet is designed for energy storage systems, which can be used with PCS, energy storage coordinating controller, distributed power source and load, and automatic and seamless switch between grid-connected and off-grid modes can be realized.

The PRS-7921 Energy storage local control terminal is an Ethernet-based intelligent logic unit introduced by CYG SUNRI using mature computer technology and network communication technology by summarizing years of experience in the development and operation of substation integrated automation systems. The purpose of this terminal is to satisfy the requirement of online monitoring of energy storage stations and the development of higher-level system monitoring.As a communication device of comprehensive automation system deployed in the substation, PRS-7921 follows the DL/T860 protocol, which is connected the BMS, PCS and the higher-level monitoring system in the station, and coordinates the data and command interaction between various devices and monitoring terminals. Specifically, it receives data sent by the online monitoring device in real time, aggregates, displays, processes, analyzes and stores the data, and realizes the control of energy storage device and standard communication with the higher-level system.