|LIU Hongrui,ZHANG Kaixiang,YIN Rong,QIAN Jing.Multi-objective parallel active energy equalizer for large-scale battery energy storage system[J].Electric Power Automation Equipment,2022,42(2):
|关键词: 大规模蓄电池 储能 有源能量均衡器 均衡效率 均衡速度 多目标并行均衡
|Multi-objective parallel active energy equalizer for large-scale battery energy storage system
LIU Hongrui1, ZHANG Kaixiang1, YIN Rong1, QIAN Jing2
1.Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China;2.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
|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.
|Key words: large-scale batteries energy storage active energy equalizer equilibrium efficiency equilibrium speed multi-objective parallel equilibrium