针对电池组中单体电池的个数较多且控制策略复杂等问题,提出了一种双层结构的主动均衡控制方法,分别控制底层双向Buck-Boost电路和顶层反激式变换器电路的开关通断,实现能量的合理转移,从而达到均衡目的。结合神经网络技术在电池荷电状态(State of Charge,SOC)估算中的应用,设计了一种新的以SOC为均衡判据的控制系统。由实验结果分析可知,所提出的双层主动均衡控制方法解决了单层均衡结构由于均衡路径长而引起的均衡时间过久的问题,均衡效率得到显著提高。
Due to the reason of huge number of cells and complex control strategy,this paper proposes a double-level active e-qualization control method,which controls the state of switch in the bottom level bi-directional Buck-Boost topology and the top level fly-back transformer topology respectively,to balance the battery pack through reasonable transfer of energy.We designed a new double-level active equalization control system based on SOC to balance the lithium-ion battery pack in the process of charg-ing.The results illustrated that the double-level active equalization control method proposed solved the traditional single-level's problem of equalization time caused by long equalization path,efficiency was improved significantly.