双层Buck-Boost电池主动均衡系统的模糊控制策略研究

Research on Fuzzy Control Strategy for a Double-Layer Buck-Boost Battery Active Equalization System

摘要: 针对锂离子电池串并联使用中的不一致性问题，本文改进传统Buck-Boost电路以实现非相邻电池间能量转移，提升了均衡灵活性与效率；采用以SOC偏差和电感电流为输入的模糊控制策略替代传统均值差值法，动态调节占空比。在MATLAB/Simulink中搭建了三种均衡方案进行对比仿真。结果表明，双层Buck-Boost拓扑相较于传统单层拓扑均衡时间缩短约68.4%；在相同双层拓扑下，本文模糊控制法相较于均值差值法均衡时间进一步缩短约19.9%。

Abstract: Regarding the inconsistency problem in series‑parallel lithium‑ion battery packs, this paper improves the conventional Buck‑Boost circuit to realize energy transfer between non‑adjacent cells, enhancing equalization flexibility and efficiency. A fuzzy control strategy taking SOC deviation and inductor current as inputs is adopted to replace the traditional mean‑difference method for dynamic duty‑cycle adjustment. Three equalization schemes are built for comparative simulation in MATLAB/Simulink. The results show that the double‑layer Buck‑Boost topology reduces the equalization time by approximately 68.4% compared with the conventional single‑layer topology. For the identical double‑layer topology, the proposed fuzzy control method further cuts equalization time by about 19.9% relative to the mean‑difference method.