基于矩阵变压器的全移相双有源全桥直流变换器的电流应力优化方法  

Current Stress Optimization Method of Full-phase-shift Dual-active Full-bridge DC Converter Based on Matrix Transformer

作　　者：吴春华 陈修淋 李智华 汪飞 WU Chunhua;CHEN Xiulin;LI Zhihua;WANG Fei(Shanghai Key Laboratory of Power Station Automation Technology(Department of Electrical Engineering,Shanghai University),Baoshan District,Shanghai 200444,China)

机构地区：[1]上海市电站自动化技术重点实验室(上海大学电气工程系),上海市宝山区200444

出　　处：《中国电机工程学报》2023年第9期3550-3563,共14页Proceedings of the CSEE

摘　　要：针对传统单一移相策略下,双有源全桥(dualactive bridge,DAB)变换器无法真正实现全局最优电感电流应力的问题,提出一种基于矩阵变压器的全移相调制优化算法。全面分析由3个移相自由度组成的6种移相模式对电感电流应力的影响,并结合传输功率的数学模型得出所有电压传输比对应的全局最优解。使用一种低压侧并联高压侧串联的新型矩阵变压器结构,并分析由此结构引入的第4个移相角对优化结果的影响。最后通过直接功率控制将调制优化算法应用到此拓扑中。仿真和实验结果表明,提出的调制优化算法可以使得DAB变换器全局电感电流应力最优,提高工作效率,在轻载时能够实现软开关。Aiming at the problem that the dual active bridge(DAB)converter cannot truly achieve the global optimal inductor current stress under one phase shifting strategy,a full phase-shifting modulation optimization algorithm based on a matrix transformer is proposed.Through comprehensive analysis of the effects of six phase-shifting modes composed of three phase-shifting degrees of freedom on inductor current stress,and the combine of the mathematical model of transmission power,the global optimal solution corresponding to all voltage transmission ratios can be obtained.A new type of matrix transformer structure with low-voltage side in parallel and high-voltage side in series is used.The influence of the fourth phase shift angle introduced by the structure on the optimization results is analyzed.Finally a modulation optimization algorithm is applied to this topology via direct power control.The simulation and experimental results show that the modulation optimization algorithm proposed in this paper can optimize the global inductor current stress of the DAB converter,improve the working efficiency,and realize soft switching at light loads.

关 键 词：双有源全桥变换器 全移相控制 电感电流应力 矩阵变压器 低压侧并联高压侧串联 第四移相角 

分 类 号：TM46[电气工程—电器]