基于区间信号提取的Ⅱ型不对称级联逆变器新型PWM调制策略  

Novel PWM Modulation Strategy for TypeⅡAsymmetric Cascaded Inverter Based on Interval Signal Extraction

作　　者：叶满园 邢瑞新 喻正炎 刘文芳 喻生铭 邵云鹏 YE Manyuan;XING Ruixin;YU Zhengyan;LIU Wenfang;YU Shengming;SHAO Yunpeng(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《高电压技术》2023年第12期5105-5113,共9页High Voltage Engineering

基　　金：国家自然科学基金(52267014)。

摘　　要：与传统对称级联逆变电桥(cascaded H-inverter bridge,CHB)逆变器拓扑相比,Ⅱ型不对称CHB多电平逆变器的直流电压按2i的指数规律分配,具有以更少级联单元输出更多电平的优势。但在传统调制策略下,会出现电流倒灌问题,为此提出一种基于区间信号提取的新型脉宽调制(pulse width modulation,PWM)策略,通过原始脉冲信号与提取的区间信号逻辑组合的方式彻底解决所有Ⅱ型不对称拓扑电流倒灌的问题,同时还能保证输出电压的波形质量。最后以直流侧电压比为1:2:4和1:2:4:8两种不同的Ⅱ型级联拓扑为例,通过搭建仿真模型和实验平台验证了所提方案的正确性和可行性。The DC voltage of the typeⅡasymmetric CHB(cascaded H-inverter bridge)multilevel inverter is distributed according to the exponential rule of 2i,which has the advantage that fewer cascaded units will output more levels when compared with the traditional symmetrical CHB inverter topology.However,the problem of current backflow will occur under the traditional modulation strategy.For this reason,this paper proposes a new PWM modulation strategy based on interval signal extraction.The logic combination of the original pulse signal and the extracted interval signal can com-pletely solve the current backflow problem of all typeⅡasymmetrical topology while ensuring the quality of the output voltage waveform.Finally,two different typeⅡcascade topologies with the DC side voltage ratio of 1:2:4 and 1:2:4:8 are taken as examples,and the correctness and feasibility of the proposed scheme are verified by building a simulation model and an experimental platform.

关 键 词：Ⅱ型不对称多电平逆变器 电流倒灌 新型PWM调制策略 分区信号提取 拓展性 

分 类 号：TM464[电气工程—电器]