一种大规模蓄电池储能系统多目标并行有源能量均衡器

针对大规模锂离子蓄电池储能系统,提出具有两层均衡的模块化多目标并行有源能量均衡器.第一层均衡以蓄电池单元作为均衡目标,蓄电池单元内主控开关采用带死区互补导通控制,所有蓄电池单元可同时工作,均衡速度快且不受串联单体蓄电池数量的影响.第二层均衡由多组选通矩阵和一个具有能量双向且连续的有源均衡主电路组成,通过选通矩阵可并行实...

Multi-objective parallel active energy equalizer for large-scale battery energy storage system

For the large-scale lithium-ion battery energy storage system, a multi-objective parallel active energy equalizer with two-layer equilibrium is proposed. The first-layer equilibrium takes the battery unit as the equalization target. The main control switch in the battery unit adopts conduction control with dead-band complementary, all battery units can work at the same time, so the equilibrium speed is fast and is not affected by the number of single batteries connected in series. The second-layer equilibrium consists of multiple sets of gating matrix and the active equilibrium main circuit with two-way and continuous energy. Through the gating matrix, the equalizing discharge or equalizing charge of multiple battery units in different battery groups can be realized in parallel, the multi-objective parallel equilibrium and continuous equalizing energy make the equilibrium speed increase doubly. The equalizer and its control strategy are analyzed in principle, and the experimental platform of battery energy storage system with series 12 lithium-ion batteries is built for experimental verification. The theoretical analysis and experimental results show that the proposed equalizer has the advantages of fast equilibrium speed, high equilibrium efficiency, small voltage stress of switch device, easy modularity and strong expandability.