摘要
针对串联锂离子电池组在均衡过程中出现均衡时间长、能量损耗大的问题,设计了一种两级均衡拓扑,并针对该拓扑设计了一种基于电池荷电状态的变论域模糊逻辑控制策略。所提拓扑在电池组内采用改进型Buck-Boost电路,优化了均衡路径;电池组间采用集中式的单电感均衡电路,可以实现任意电池组间的均衡。所提策略在模糊逻辑控制的基础上引入伸缩因子对输入论域灵活调节,通过对均衡电流的精准调整进一步提高均衡速度和能量利用率。最后搭建均衡系统进行验证,结果表明,本文拓扑比分组Buck-Boost拓扑减少了约12.53%的均衡时间。在相同的静置和充放电条件下,与FLC算法相比,本文策略不仅减少了约20.98%的均衡时间,且提高了约7%的能量利用率。验证了本文均衡方案的可行性。
Aiming at the problems of long equalization time and large energy loss in the equalization process of seriesconnected lithium-ion battery packs,a two-level equalization topology is designed in this paper,and a variable universe fuzzy Logic control strategy based on battery state of charge is designed for this topology.The proposed topology adopts an improved Buck-Boost circuit within the battery pack to optimize the equalization path,and a centralized single-inductance equalization circuit is used between the battery packs,which can achieve equalization between any battery packs.The proposed strategy introduces a contraction-expansion factor on the basis of fuzzy logic control to flexibly regulate the input domain,which further improves the equalization speed and energy utilization by precisely adjusting the equalization current.Finally,the equalization system is built for validation,and the results show that the topology of this paper reduces the equalization time by about 12.53%compared to the grouped Buck-Boost topology.Under the same static and charging/discharging conditions,the strategy in this paper not only reduces the equalization time by about 20.98%but also improves the energy utilization by about 7%compared with the FLC algorithm.The feasibility of the equalization scheme in this paper is verified.
作者
廖力
李宏光
李厚佳
姜久春
Liao Li;Li Hongguang;Li Houjia;Jiang Jiuchun(Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storagy System,Hubei University of Technology,Wuhan 430068,China)
出处
《电子测量技术》
北大核心
2023年第24期21-30,共10页
Electronic Measurement Technology
基金
国家自然科学基金(52177212)
湖北省教育厅科学研究计划(T2021005)项目资助
关键词
变论域模糊逻辑控制
伸缩因子
Buck-Boost电路
两级均衡
variable universe fuzzy Logic control
contraction-expansion factor
Buck-Boost circuit
two-level equalization
