双向全桥串联谐振DC/DC变换器扩展相移控制的全局优化方法  

Global Optical Control Method of Dual-bridge Series Resonant DC/DC Converters Based on Extended Phase Shift Control

作　　者：尹帅 邓亚茹 宋文胜[1] 陈健 冯晓云[1] YIN Shuai;DENG Yaru;SONG Wensheng;CHEN Jian;FENG Xiaoyun(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031

出　　处：《中国电机工程学报》2023年第20期8060-8072,共13页Proceedings of the CSEE

基　　金：四川省青年科技创新研究团队项目(22CXTD0055);高铁联合基金重点项目(U1934204)。

摘　　要：基于传统基波等效法建立的双向全桥串联谐振(dual bridge series resonant,DBSR)DC/DC变换器模型准确度不高,导致控制存在误差,变换器的工作效率降低。文中采用分段分析法建立DBSR变换器在扩展相移(extended phase shift,EPS)控制下的模型,能够准确描述变换器的特性。传统单相移控制下变换器的回流功率和开关损耗较大,导致变换器工作效率降低,而文中提出一种基于EPS控制的全局优化控制方法,能有效降低回流功率和开关损耗。首先分析双向全桥串联谐振DC/DC变换器的回流功率原理,建立回流功率的优化控制模型;然后结合软开关条件及考虑死区时间下的完全软开关特性,建立双向全桥串联谐振DC/DC变换器的全局优化控制算法;最后,在基于TMS320F28335控制器的实物实验平台上,对所提方法与传统方法在宽电压增益下以及全功率范围内进行实验对比。实验结果表明:与传统基波分析法相比,所提建模方法具有更高的准确度,且所提的优化控制方法可以有效降低回流功率,显著降低变换器的开关损耗,能够大幅提升变换器的传输效率。The accuracy of the dual bridge series resonant(DBSR)DC/DC converter model established based on the traditional fundamental harmonic analysis is low,which results in control errors and reduces the efficiency of the converter.In this paper,the segmental analysis method is used to set up the model of the DBSR converter under the extended phase shift(EPS)control,which can accurately describe the characteristics of the converter.The backflow power and switching loss of the converter under the traditional single-phase shift control are relatively large,which leads to the reduction of the efficiency of the converter.In this paper,a global optimization control method based on EPS control is proposed,which can effectively reduce the backflow power and switching losses.First,the principle of backflow power of the DBSR converter is analyzed,and the optimal control model of backflow power is set up.Then,the global optimal control algorithm of the DBSR converter is established by combining soft-switching conditions and considering the complete soft-switching characteristics under dead time.Finally,on the physical experimental platform based on the TMS320F28335 controller,the experimental comparison between the proposed method and the traditional method is carried out under the wide voltage gain and the full power range.The experimental results show that compared with the traditional fundamental harmonic analysis,the proposed modeling method has higher accuracy,and the proposed optimal control method can effectively reduce the backflow power,significantly reduce the switching loss of the converter,and greatly improve the transmission efficiency.

关 键 词：双向全桥串联谐振DC/DC变换器 扩展相移控制 回流功率 软开关 传输效率 

分 类 号：TM46[电气工程—电器]