基于遗传算法的多模块IPOP双有源全桥DC-DC变换器总电流有效值优化策略  

Total Root Mean Square Current Optimization of IPOP Dual Active Bridge DC-DC Converter Based on Genetic Algorithm

作　　者：江凌峰 龚邻骁 金新宇 陈捷 王勇[1] Jiang Lingfeng;Gong Linxiao;Jin Xinyu;Chen Jie;Wang Yong(School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University,200240 China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《电工技术学报》2023年第24期6782-6797,共16页Transactions of China Electrotechnical Society

摘　　要：单模块双有源全桥DC-DC变换器,可通过最优移相策略来保证电流有效值最优。然而,当多模块并联运行时,由于模块间电气量无法完全匹配一致,不同模块间的电流有效值特性将有所差异,导致传统的均功率控制无法做到总效率最优。基于此,该文提出一种基于遗传算法的多模块输入并联输出并联(IPOP)双有源全桥DC-DC变换器总电流有效值优化策略。首先,该文结合遗传算法对单模块双有源全桥变换器的电流有效值特性进行分析与优化,该算法集成了单、双、三重移相控制的优势,同时可自然实现三种移相策略的无缝过渡。其次,针对输入输出并联的多模块变换器系统,提出一种基于离线计算在线查表,总电感电流有效值最优的控制策略。不同于传统的均功率控制方法,该策略可根据模块间辅助电感的差异化对总功率进行优化分配,以实现系统的总电感电流有效值最优。最后,搭建一台基于碳化硅器件的8 kW/100 kHz三模块并联样机对优化控制策略进行验证,实验表明,基于优化控制策略,样机峰值效率可达98.8%,与传统均功率控制策略进行对比,在降压和升压工况下,平均效率分别提升了1.2%和0.84%,验证了该文所提控制策略的有效性。The dual active bridge(DAB)converter is one of the most popular DC-DC topologies due to its galvanic isolation between input and output,wide voltage gain,and zero-voltage-switching(ZVS)operation in a wide load range.For a single module dual active bridge(DAB)converter,minimum root mean square current can be achieved using an optimized phase shift control strategy.However,for multi-module parallel operation systems,virtually identical electrical characteristics for each module are difficult to achieve,making the power balance control strategy unable to achieve general optimum efficiency.Therefore,this paper proposes a power difference control strategy for the input parallel and output parallel(IPOP)DAB converter system.By analyzing the difference of auxiliary inductors of each module,a differential power distribution ratio is set,which minimizes the root mean square current of the system.Firstly,an optimized triple-phase shift control strategy for a single-module DAB converter is analyzed.An optimized triple-phase shift is calculated by introducing a genetic algorithm,which minimizes the root mean square inductor current.Secondly,based on a single-module optimized control strategy,the different RMS inductor current for each module with a differential auxiliary inductor in the IPOP DAB converter system is illustrated.Thirdly,an optimal model to minimize total RMS current for the IPOP DAB converter system is constructed.The optimal results of the model are carried out by a genetic algorithm.Finally,based on the calculation results,an optimal control strategy for the IPOP DAB converter system is proposed.Unlike the traditional strategy that ensure power balancing between modules,the differential power distribution ratio for each module is set based on the difference of auxiliary inductors in the proposed control strategy to minimize the root mean square(RMS)current of the system.To verify the theoretical analysis,an experimental prototype with three parallel modules based on SIC devices of 8 kW/100 kHz is built.Herei

关 键 词：双有源全桥变换器 输入并联输出并联 遗传算法 功率分配 电感电流有效值 

分 类 号：TM46[电气工程—电器]