针对直流微电网储能系统中高电流应力导致蓄电池加速老化的问题,对双重移相调制下DAB变换器的峰值电流优化展开研究。首先,对双重移相调制下DAB变换器的换流过程及工作特性进行分析。然后,为降低电压不匹配时的电流应力,该研究以峰值电流表达式为目标函数,采用KKT条件构建数学模型,并求解出双重移相调制下Buck模式4种运行模态的最优移相比。将优化移相比分别代入各模态的边界条件,得出电流应力局部最优的功率传输范围。通过对比4种模态电流应力的大小关系,构建适用于全功率范围自适应ZVS模式的电流应力优化方案,确保全功率范围内电流应力达到最优水平。最后,通过实验验证在电压不匹配运行时,自适应ZVS模式调制与SPS调制和完全ZVS模式调制相比电流应力更小。
Abstract
Aiming at the problem of accelerated battery aging due to high current stress in DC microgrid energy storage system, the peak current optimization of DAB converter under double phase shift modulation is investigated. Firstly, the commutation process and operating characteristics of the DAB converter under double phase-shift modulation are analyzed. Then, in order to reduce the current stress during voltage mismatch, the study takes the peak current expression as the objective function, constructs a mathematical model using the KKT condition, and solves the optimal shift ratios for the four operating modes of the Buck mode under double phase-shift modulation. The optimal shift ratio is substituted into the boundary conditions of each mode, and the local optimal power transfer range of current stress is derived. By comparing the magnitude of the current stress of the four modes, the current stress optimization scheme suitable for the full power range adaptive ZVS mode is constructed to ensure that the current stress reaches the optimal level in the full power range. Finally, it is experimentally verified that the adaptive ZVS mode modulation has less current stress compared with SPS modulation and full ZVS mode modulation during voltage mismatch operation.
关键词
直流微电网 /
双有源桥 /
双重移相 /
电流应力 /
零电压开关（ZVS） /
KKT条件
Key words
DC microgrid /
dual active bridge /
dual phase-shift /
current stress /
zero voltage switching /
KKT condition
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