Development of supervising system for battery energy storage system based on the two-level architecture

The real-time monitoring of status parameters, such as cell voltage and state of charge (SOC), is an important guarantee of the safety operation of the battery energy storage system (BESS). And the two-level architecture of hardware system which includes several battery management units (BMU) and the central management unit (CMU) is designed with the communication protocol and data conversion algorithm for achieving the data acquisition and communication. Moreover, an enhanced SOC method involving the resting time and the terminal voltage is researched and programmed in the software system. The battery supervising system is verified by lots of experiments that it could satisfy the monitoring demand of BESS and has improved the accuracy of SOC estimation effectively.