一种双直流输入多电平双Buck逆变器  

A Dual-DC-Input Multi-Level Dual-Buck Inverter

作　　者：杨帆[1] 葛红娟[1,2] 党润芸 杨晶帆 吴红飞[1] Yang Fan;Ge Hongjuan;Dang Runyun;Yang Jingfan;Wu Hongfei(College of Automation Nanjing University of Aeronautics and Astronautics Nanjing 211106 China;College of Civil Aviation Nanjing University of Aeronautics and Astronautics Nanjing 211106 China)

机构地区：[1]南京航空航天大学自动化学院,南京211106 [2]南京航空航天大学民航学院,南京211106

出　　处：《电工技术学报》2018年第6期1320-1327,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51677085);台达电力电子科教发展基金(DREG2016007);中央高校基本科研业务费专项资金(NJ20160042)资助项目

摘　　要：提出一种包含两个直流输入端口的多电平双Buck逆变器。通过在传统双Buck逆变器中引入双直流输入三电平开关单元,构建低压直流输入源与逆变器交流输出侧的直接功率通路,使得低压直流输入源的部分功率无需经过逆变器前级升压电路处理,有效减小了逆变器前级升压电路的功率应力和损耗。同时,逆变器利用两个直流输入在交流电压周期内实现五电平输出,有效减小了逆变器自身开关管的电压应力和开关损耗。此外,逆变器保留了传统双Buck逆变器无桥臂直通、无体二极管反向恢复问题的优点。详细分析逆变器的工作原理和特性,并给出一种适应宽直流电压范围的载波自适应调制策略。实验结果证明了所提出双直流输入多电平双Buck逆变器及其控制策略的正确性和有效性。A dual-DC-input multi-level dual-Buck inverter(DI-ML-DBI)is proposed in this paper.A direct power flow path between the low voltage DC input source and the AC output of the inverter is built by introducing two dual-DC-input three-level switching cells into a traditional dual-buck inverter.Therefore,partial input power from the low voltage source can be directly fed to the AC output through the inverter without being processed by the front-end Boost converter of the inverter.Hence,the power rating and power losses of the front-end Boost converter are reduced significantly.Meanwhile,five voltage-levels are generated by the DI-ML-DBI with the help of the two DC input sources,which lead to the reduction of switch voltage stresses and switching losses.In addition,the proposed DI-ML-DBI retains the advantages of no shoot-through and no body-diode reverse-recovery problems.The operation principles and characteristics of the proposed DI-ML-DBI are analyzed in detail,and an adaptive-carrier-based modulation strategy is presented for wide DC input voltage range application.The experimental results verify the proposed DI-ML-DBI and its control strategy.

关 键 词：双Buck 逆变器 双输入 多电平 高效率 

分 类 号：TM46[电气工程—电器]