多级离散扩展移相控制双有源桥DC-DC变换器的原理、参数设计与性能  

Principle,Parameters Design and Performance of Multistage Discrete Extended-Phase-Shift Control Dual Active Bridge DC-DC Converters

作　　者：刘赞 沙金[1] 邱高峰 陈丽蓉 Liu Zan;Sha Jin;Qiu Gaofeng;Chen Lirong(School of Electrical Engineering,Southwest Jiaotong University,Chengdu,610031,China;Sg Micro Corp,Beijing,100005,China)

机构地区：[1]西南交通大学电气工程学院,成都610031 [2]圣邦微电子(北京)股份有限公司,北京100005

出　　处：《电工技术学报》2024年第12期3761-3773,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52277200)。

摘　　要：该文提出一种双有源桥(DAB)DC-DC变换器的多级离散扩展移相(MD-EPS)控制,旨在提升DAB DC-DC变换器系统的动态响应性能。同时,考虑效率优化,兼顾额定功率范围、输出电压纹波等性能指标,研究MD-EPS控制的离散参数分布方式对控制性能的影响及参数设计方法。通过搭建160 W小功率实验样机对MD-EPS的控制性能进行了验证。实验结果表明,与传统扩展移相控制相比,DABDC-DC变换器的MD-EPS控制能够大幅提升变换器系统的动态响应速度(响应时间缩短99.95%),最高效率为94.54%。The DC-DC converter plays a pivotal role in renewable energy systems by serving as an interface converter connecting the DC bus and energy storage devices.The application demands a fast dynamic response to accommodate load fluctuations,voltage drops,or other external disturbances.Therefore,a multi-stage discrete extended-phase-shift(MD-EPS)control method is proposed for DAB DC-DC converters,considering peak-to-peak value current optimization during the control design.Thus,the proposed MD-EPS control can achieve both a fast dynamic response and high efficiency across a wide load range.Firstly,this paper provides a comprehensive introduction to the principle of MD-EPS control.Different from conventional linear control methods,the proposed MD-EPS controller has(m−1)level output voltage references Uref,j(j=1,…,m−1,and m is an even number),dividing the output voltage into m output voltage intervals[U_(ref,j-1),U_(ref,j)].Each interval corresponds to preset fixed inner/outer phase-shift duty ratio signals D1,j and D2,j.At the beginning of each switching cycle,the output voltage Uo is sampled and compared with m−1 level U_(ref,j) to determine the instantaneous output voltage’s corresponding interval when U_(o)∈[U_(ref,j-1),U_(ref,j)],D_(1)(D1=D_(1,j))and D_(2)(D_(2)=D_(2,j))are selected as the active phase-shift duty ratio signals for the current switching cycle.Secondly,the control parameter design method is presented using the 4-level discrete extended-phase-shift(4LD-EPS)controlled DAB DC-DC converter as an example.The rated power range,output voltage ripple,and peak current optimization are considered during the parameter design.Thirdly,the steady-state performance,dynamic performance,and interference immunity of the 4LD-EPS controlled DAB DC-DC converter are explored by theoretical analysis and simulation verification.Finally,the control performance of the proposed converter is verified by a 160W low-power test prototype.The experimental results highlight a remarkable improvement in the dynamic response

关 键 词：双有源桥变换器 离散移相 动态性能 效率 

分 类 号：TM46[电气工程—电器]