图腾柱双有源桥AC-DC变换器的非对称扩展移相优化调制策略  

Asymmetric Extended Phase Shift Optimized Modulation Strategy for Totem Pole Dual Active Bridge AC-DC Converter

作　　者：余城洋 李佳 晏益朋 牟迪 罗全明[1] Yu Chengyang;Li Jia;Yan Yipeng;Mou Di;Luo Quanming(State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University,Chongqing 400044 China;School of Automation Chongqing University of Posts and Telecommunications,Chongqing China 400065)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学电气工程学院),重庆400044 [2]重庆邮电大学自动化学院,重庆400065

出　　处：《电工技术学报》2025年第8期2560-2572,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52177170)。

摘　　要：单级式图腾柱双有源桥AC-DC变换器具有元件数量少、功率密度高和成本低等优点,在车载充电机等领域具有广阔的应用前景。然而,现有的单移相和扩展移相调制策略由于存在调制自由度不足的问题,而无法对变换器进行多目标的优化,使图腾柱双有源桥AC-DC变换器在并网电流质量和效率等稳态性能方面仍有提升空间,限制了该变换器在车载充电机中的进一步应用。首次,该文在扩展移相调制策略的基础上引入非对称调制,从而提出具有三个自由度的非对称扩展移相调制策略。其次,对变换器在非对称扩展移相调制下所有可能的工作模式进行分析,并借助时域分析法建立各工作模式的时域稳态分析模型。然后,考虑控制传输功率以实现功率因数校正的同时,进行电感电流初值和峰峰值的多目标优化调制策略求解。最后,相比传统的单移相和扩展移相调制策略,所提出的非对称扩展移相优化调制策略大幅度提升了变换器的稳态性能:并网电流的质量显著提升,峰值效率提升超过5%和1.5%。所提理论分析和优化结果都在仿真和实验中得到了验证。The single-stage Totem pole dual active bridge(DAB)AC-DC converter has the advantages of low component count,high power density,and low cost,which has a broad application prospect in the field of on-board chargers(OBC).However,in the available research,the traditional single phase shift(SPS)and extended phase shift(EPS)modulation strategies are unable to optimize the quality of grid-connected current and efficiency of the Totem pole DAB AC-DC converter at the same time due to the problem of insufficient modulation degrees of freedom,limiting the further application in on-board chargers.This paper introduces the asymmetric modulation based on the extended phase shift modulation strategy when the duty cycle of the secondary side switching tubes is no longer 50%.An asymmetric extended phase shift(AEPS)modulation strategy with three degrees of freedom is proposed.Accordingly,a multi-objective optimal modulation strategy is solved by considering the simultaneous optimization of the grid-connected current quality and efficiency of the Totem pole DAB AC-DC converter.Firstly,the steady-state analytical model of AEPS modulation is established by using the time domain analysis method.The initial value decoupling constraint of the inductor current is considered to optimize the quality of grid-connected current,and the peak-to-peak inductor current is taken as the optimization objective.According to the Lagrange algorithm and Karush Kuhn Tucker conditions,the above multi-objective optimization problem is transformed into mathematical equations to solve the optimization solution of modulation variables.Matlab simulations show that the inductor current’s initial value decoupling and peak-to-peak value optimization are realized under the AEPS optimization modulation strategy.Compared with the SPS and EPS modulation,the proposed AEPS optimization modulation strategy reduces the peak-to-peak and RMS levels of the inductor current in the full power band,which reduces the conduction loss of the converter.Moreover,the optimized so

关 键 词：图腾柱双有源桥 AC-DC变换器 非对称扩展移相调制 功率因数校正 优化调制策略 

分 类 号：TM46[电气工程—电器]