高电压技术2023，Vol.49Issue(12)：5105-5113,9.DOI:10.13336/j.1003-6520.hve.20220361
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 Type Ⅱ Asymmetric Cascaded Inverter Based on Interval Signal Extraction
摘要
Abstract
The DC voltage of the type Ⅱ asymmetric 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 type Ⅱ asymmetrical topology while ensuring the quality of the output voltage waveform.Finally,two different type Ⅱ cascade 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Key words
type Ⅱasymmetric multilevel inverter/current backflow/novel PWM modulation method/partition signal extraction/expandability引用本文复制引用
叶满园,邢瑞新,喻正炎,刘文芳,喻生铭,邵云鹏..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[J].高电压技术,2023,49(12):5105-5113,9.基金项目
国家自然科学基金(52267014).Project supported by National Natural Science Foundation of China(52267014). （52267014）
