T型三电平双有源桥变换器ZVS优化策略  

ZVS Optimization Strategy of T-type Three-level Dual Active Bridge Converter

作　　者：杨向真[1,2] 孔令浩 杜燕 苏建徽[1,2] 张徐进博[1,2] YANG Xiangzhen;KONG Linghao;DU Yan;SU Jianhui;ZHANG Xujinbo(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Research Center for Photovoltaic System Engineering of Ministry of Education,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]光伏系统教育部工程研究中心,合肥230009

出　　处：《高电压技术》2022年第5期1913-1923,共11页High Voltage Engineering

基　　金：国家重点研发计划(2021YFB2601402)。

摘　　要：当输入输出电压不匹配时,为了使双有源桥变换器(dual-active-bridge,DAB)在全功率范围内运行都能实现零电压开通(zero voltage switching,ZVS),以T型三电平双有源桥(T-type three-level DAB,T3L-DAB)变换器为研究对象,与传统两电平DAB相比,该变换器引入了中间电平,增加了控制自由度。结合移相控制,提出了功率分段式ZVS(power segmented ZVS,PSZVS)优化方法,能够灵活控制电感电流的方向,实现了开关管在全功率范围内的ZVS。最后,在StarSim硬件在环实验平台和实物实验平台上进行了验证,实验结果表明,PSZVS优化方法在实现全功率范围内开关管ZVS的同时,兼顾了对电流应力和回流功率的优化。在低功率运行时,PSZVS优化下系统效率可达94.1%,而传统移相控制系统效率仅为82.5%。因此,所提PSZVS优化方法在提升系统效率方面是有效可行的。When the input and output voltages do not match,in order to enable the dual-active-bridge converter(dual-active-bridge,DAB)to operate in the full power range so as to achieve zero voltage switching(ZVS),the T-type three-level DAB(T3 L-DAB)converter is used as the research object.Compared with the traditional two-level DAB,the intermediate level is introduced and the degree of control freedom is increased.Combined with the phase shift control,this paper proposes a power segmented ZVS(PSZVS)optimization method,which can flexibly control the direction of the inductor current and realize the ZVS of the switch in the full power range.Finally,it is verified on the StarSim hardware-in-the-loop experimental platform and the physical experimental platform.The experimental results show that the PSZVS optimization method realizes the switching tube ZVS in the full power range while taking into account the optimization of current stress and return power.In low-power operation,the system efficiency under PSZVS optimization can reach 94.1%,while the efficiency of the traditional phase-shift control system is only 82.5%.Therefore,the proposed PSZVS optimization method is effective and feasible in improving system efficiency.

关 键 词：电压不匹配 双有源桥变换器 全功率范围 零电压开通 T型三电平 功率分段 

分 类 号：TM46[电气工程—电器]