Energy storage system and multistage protection method thereof

The invention discloses an energy storage system, which includes an energy management system (EMS), a battery management system (BMS), a power conversion system (PCS), and an energy storage battery system which are in communication connection. The system is safe and reliable, and stable in operation. Further, a multistage protection method of the system is also disclosed. The multistage protectionmethod uses a multistage nested protection strategy, helps to improve the stability and reliability of the system. In the event of a system failure, the multistage protection method can minimize security risks and reduce on-site maintenance cost. 本发明公布了一种储能系统，包括通讯连接的能量管理系统EMS、电池管理系统BMS、双向充放电设备PCS以及储能电池系统，该系统安全可靠，运行稳定，同时还公开了该系统的一种多级保护方法，该多级保护方法采取多级嵌套保护策略，有助于提高系统稳定性和可靠性，一旦系统发生故障，可以将安全风险降至最低，还减少现场的修护成本。