Comparison of charging methods of multilevel hybrid energy storage for electromagnetic launch
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摘要: 从工作原理、器件参数指标、系统效率、纹波系数等方面深入研究对比了蓄电池到脉冲电容器的三种充电方式：直流斩波、恒压、台阶升压，并建立了仿真模型。理论推导与仿真结果显示台阶升压充电效率达到0.911，远高于恒压方式的0.5，其对于晶闸管等器件的参数指标要求却是直流斩波的1/n（n为电池组分组数），并且能在不增加开关损耗的基础上将纹波系数限制在16%，甚至更低。利用混合储能样机进行了台阶升压实验，所得数据与仿真波形吻合较好。结果表明，台阶升压方式最适合应用于混合储能。Abstract: Three charging methods, the DC chopper, the invariable voltage and the step voltage were analyzed in this paper. They were compared from the work principle, facilitys guide line, efficiency and ripple. Then the simulation models were constituted. The theoretical derivation and simulation results show that the efficiency of the step voltage arrives 0.911, which is better than the 0.5 of the invariable voltage. The guideline for the step voltage is n times lower than that for the DC chopper and it can confine the current ripple in 16% or even better with no increasing in switch waste. The experiment was conducted on a multilevel hybrid energy storage swatch for step voltage method. The result matches the simulation result well. So we get conclusion that the step voltage is the best method for the multilevel hybrid energy storage device.
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Key words:
- hybrid energy storage /
- series resonant /
- step voltage /
- ripple restrain /
- invariable voltage charge
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