Study of loop current suppression between multi-battery clusters in energy storage systems

In this paper, a multi-battery cluster equalization circuit and its control method are proposed for the problem of inter-cluster loop current generated by multiple battery clusters when they are connected in parallel in battery energy storage technology, which is able to equalize the voltages of multiple battery clusters, thus effectively suppressing the inter-cluster loop current of multi-battery clusters, and improving the performance and lifetime of the battery energy storage system. In this paper, the topology, working principle and control method of the multi-battery inter-cluster equalization circuit are introduced, and simulation verification is carried out in Matlab/Simulink, and the results show that the multi-battery inter-cluster equalization circuit proposed in this paper can solve the problem of loop current generated by different battery clusters connected in parallel due to different SOCs and the existence of voltage difference. The equalization circuit has the advantages of simple structure, convenient control and low power loss.