基于三阈值控制的主动均衡策略研究

Research on active equalization strategy based on three threshold control

传统均衡策略应用于单均衡器均衡电路时,可能存在电池达到均衡条件但均衡器暂时无法为电池均衡的情况,均衡器利用率低。针对这一问题,采用基于开关矩阵的双向DC/DC型均衡电路拓扑结构,提出三阈值控制的主动均衡控制策略,将电池根据SOC偏移量分为动作区、预动作区和不动作区,通过增设结束阈值减少均衡器的重复动作次数,同时通过增设预动作阈值让处于预动作区的电池在均衡器不动作时提前进行均衡,以提高均衡器的利用率。实验结果表明,在保证电池组不一致性处于允许范围内的前提下,相较于传统均衡策略,三阈值均衡控制策略均衡器的利用率提高了8.38%。

When the traditional equalization strategy is applied to a single equalizer equalization circuit,the equalizer may not be able to balance the battery for a while,and the equalizer utilization is low.Aiming at this problem,this paper adopts a bidirectional DC/DC type equalization circuit based on switch matrix,and proposes an active equalization control strategy with three thresholds to divide the battery into action area,pre-action area and non-action area according to SOC offset.The threshold reduces the number of repetitions of the equalizer.The pre-action threshold allows the battery to be balanced in advance when the equalizer is not operating to improve the utilization of the equalizer.The experimental results show that the battery group inconsistency is within the allowable range.Compared with the traditional equalization strategy,the utilization rate of the three-threshold equalization control strategy equalizer proposed is increased by 8.38%.