基于多目标优化的高频DAB变换器混合多重移相控制策略  

Hybrid Phase Shift Control Strategy for High-frequency DAB Converter Based on Multi-objective Optimization

作　　者：龚邻骁 李文辉 徐军忠 李厚基 王勇[1] GONG Linxiao;LI Wenhui;XU Junzhong;LI Houji;WANG Yong(Department of Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China)

机构地区：[1]上海交通大学电气工程系,上海市闵行区200240

出　　处：《中国电机工程学报》2024年第4期1517-1533,I0022,共18页Proceedings of the CSEE

摘　　要：随着双有源全桥(dual active bridge,DAB)变换器开关频率的提升,半导体器件的开关损耗占比越来越大,基于回流功率、电感电流峰值或有效值的单目标效率优化策略的优势逐渐丧失。为提升DAB变换器的高频工况运行效率,文中对DAB最优模态与优化目标进行定量分析与选择,提出一种可同时实现电感电流有效值准最优、宽范围软开通的移相策略,在该策略下轻重载工况所有开关管均可实现软开通,中载仅有两个开关管丢失软开通。为保证软开通的有效实现,根据电荷交换和死区时长两个条件推导实现软开通所需电流的统一表达式。再者,将软开通谐振过程线性化处理,所得简化表达式可与本文移相模态相结合,可实现任意开关管在任意模态下的软开通。最后,搭建6.6 k W/150 k Hz的碳化硅实验平台进行验证。实验结果表明,所研究的多目标优化策略可同时减小开通损耗与导通损耗,有效提升DAB变换器在高频工况下的运行效率。With the increasing of the dual active full bridge(DAB)converter’s operating frequency,the proportion of active semiconductors’switching loss is prominent,resulting in the fact that the single-objective optimization strategies based on the backflow power,peak or RMS inductor current are gradually losing the efficiency advantages.To improve the high-frequency operation efficiency,this paper carries out a quantitative analysis of optimal operation modes and optimization objectives of DAB,and further proposes a control scheme by which the quasi-optimal inductor RMS current and wide zero voltage switching(ZVS)operation can be realized simultaneously.Specifically,the ZVS operation of all switches can be realized in light and heavy loads,and the ZVS operation of six switches can be achieved in medium load.Furthermore,for the reliability of ZVS operation,the unified current expressions required for the ZVS process are derived based on the charge exchange and dead time.The ZVS resonance process is linearized in this paper,and the ZVS current can be combined with the phase-shifting mode,by which the realization of ZVS of all switches in all modes can be guaranteed.Finally,a 6.6 kW/150 kHz SiC experimental platform is built,and the experimental results show that the switching loss and conduction loss can be reduced simultaneously by the multi-objective optimization strategy,effectively improving the operation efficiency of DAB converter at high frequency.

关 键 词：高频双有源全桥变换器 电感电流有效值准最优 宽软开通范围 软开通电流 

分 类 号：TM46[电气工程—电器]