电磁发射用多级混合储能装置充电策略

A study of charging strategy of multilevel hybrid energy storage for electromagnetic launch

针对多级混合储能装置这种特殊、新型储能结构必须实现蓄电池到脉冲电容器的快速充电才能充分展现其技术优势的特点,首先在时序串联充电策略基础上提出了一种效率更高的改进充电策略,在蓄电池组数不变的情况下首先并联电池组对电容充电,电压达到一定水平后改变电路结构即将并联电池组转换为串联继续对电容器充电,从而提高充电效率;然后,建立了仿真实验平台,对改进策略和此策略中引入的系数α进行了分析,结果显示:α的不同取值对充电效率与恒流区宽度有较大影响,改进后充电效率提高最多可达40.7%。蓄电池到脉冲电容的新型充电策略极大地提高了充电效率,为混合储能更好地应用于电磁发射奠定了理论基础。

Compared with the single energy storage mode, the multilevel hybrid energy storage mode has high power and energy density. To exhibitits technical advantage sufficiently, the efficient charging of capacitor is needed. A new strategy based on the scheduling-series strategy is put forward. Firstly, the circuit of parallel structure is used to charge the capacitor. When the voltage of capacitor reaches the voltage of series batteries, the structure of circuit is changed from parallel connection to series connection. Compared with series scheme, this new strategy is more efficient. The experiment and simulation results show that the new scheme improves the efficiency by 40.7% compared to the old one. The a introduced by parallel-series charging strategy can affect the charging efficiency and the width of the invariablecurrent. The new charging scheme establishes the academic foundation for mul- tilevel hybrid energy storage.