基于耦合电感的多相交错并联双向DC-DC变换器及其均流控制  

Multi-Phase Interleaved Bidirectional DC-DC Converter with Coupled Inductors and Current Sharing Control Strategy

作　　者：苏冰 王玉斌[1] 王璠 郭政 董羽翔 Su Bing;Wang Yubin;Wang Fan;Guo Zheng;Dong Yuxiang(School of Electrical Engineering Shandong University,Jinan 250061 China)

机构地区：[1]山东大学电气工程学院,济南250061

出　　处：《电工技术学报》2020年第20期4336-4349,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51277115);山东省自然科学基金(ZR2018MEE037)资助项目。

摘　　要：为了解决多相交错并联磁集成双向DC-DC变换器中单磁心耦合电感结构不对称、成本高和设计比较困难等问题,提出一种基于双绕组耦合电感的多相交错并联双向DC-DC变换器。该文以四相交错并联双向DC-DC变换器为例,采用四个双绕组耦合电感代替单磁心耦合电感,详细研究所提变换器的稳态和暂态性能。同时,变换器运行时由于相电路参数差异可能引起相间不均流问题,使得重载相过载发热,进而影响到整个变换器的运行可靠性。为此,该文提出一种基于相电流解耦的均流控制策略来解决这个问题。最后,通过仿真和样机实验验证了所提拓扑和均流控制方法的优越性、可靠性和实用性。With the increase of phase number,multi-phase interleaved and magnetically integrated bidirectional DC-DC converter with single-core coupled inductor has several problems,such as asymmetrical parameters,high manufacturing cost,difficult design of the multi-phase magnetic core,and so on.In this paper,a multi-phase interleaved bidirectional DC-DC converter with two-winding coupled inductors is proposed.Taking four-phase interleaved bidirectional DC-DC converter as an example,this paper uses four two-winding coupled inductors instead of single-core coupled inductors.The steady-state and transient performance is then studied in detail.Meanwhile,the difference in phase circuit parameters may cause uneven current among phases,which makes excessive thermal and device stress in heavy-load phase,thereby deteriorating the whole system reliability.Therefore,a phase-decoupled current sharing control strategy is proposed.Finally,simulation and the prototype experiment have verified the superiority,reliability and practicability of the proposed converter and current sharing control strategy.

关 键 词：双向DC-DC变换器 耦合电感 稳态和暂态性能 均流控制策略 相电流解耦 

分 类 号：TM46[电气工程—电器]