Battery energy storage system SOC balance control system, method and device and storage medium

Abstract

The invention discloses a battery energy storage system SOC balance control system, method and device and a storage medium. The system comprises a battery management system, an LCC resonant converter, a battery module and an acquisition unit. The LCC resonant converter provides voltage and current required by SOC equalization for the battery module; the acquisition unit acquires the running state information of the single battery and sends the running state information to the battery management system; switches are respectively arranged at the two ends of each single battery in the battery module; and the battery management system controls the voltage or current provided for the battery module by the LCC resonant converter based on the operation state information of the battery module, and controls the on-off of the switches at the two ends of the battery monomer, thereby realizing SOC equalization. The system integrates LCC power control and a reconfigurable battery circuit topological structure, and can be reconfigured to realize charge and discharge control and balance control between battery modules in the battery energy storage system. The semiconductor device and the inductor are shared in different working modes, so that the structure is compact.

Description

technical field [0001] The invention belongs to the technical field of battery system control, and in particular relates to a battery energy storage system SOC balance control system, method, device and storage medium. Background technique [0002] Battery energy storage technology offers a wide range of power and energy densities, making it suitable for both mobile and stationary bulk storage applications. The growing demand for energy storage in electric vehicles and the grid has driven the development of battery energy storage, while the cost of battery technology has also been significantly reduced. In applications, a single battery has low voltage and low current capacity, which cannot meet the application requirements of energy storage systems. Most battery energy storage systems have multiple series-parallel modules, and each module consists of multiple series-parallel units. Typically, dc-dc converters are used to provide a controllable power interface between the b...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a battery energy storage system SOC balance control system, method, device and storage medium to solve the problem of achieving SOC balance between battery modules in the prior art, which needs to be achieved by introducing an additional balance circuit between modules , or provide individually controlled dc-dc converters for each battery module, but both approaches have the problem of requiring a large number of additional components

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