摘要
Abstract
Aimed at the problem of low efficiency of a dual active bridge(DAB)converter in the wide voltage range of single phase shift modulation strategy,a one-sided asymmetric duty modulation strategy is proposed in this paper,which significantly improves the efficiency of DAB converter,especially in the case of light load.First,the principle of one-sided asymmetric duty modulation scheme is described,and two operation modes are obtained according to the relation-ship of control degrees of freedom.Second,based on the time-domain analysis,the steady-state characteristics in the two operation modes are derived,including inductance current and transmission power.Third,in order to find the optimal combination of control degrees of freedom,the peak-to-peak value of inductance current is selected as the optimization objective,and the optimal one-sided asymmetric duty modulation strategy is obtained by applying the KKT condition.Fi-nally,an experimental platform for DAB converter based on SiC device was built,and experimental results verified the effectiveness of the proposed one-sided asymmetric duty modulation strategy.关键词
双有源桥/非对称/调制策略/效率/KKT条件Key words
Dual active bridge(DAB)/asymmetric/modulation strategy/efficiency/KKT condition分类
信息技术与安全科学
