电力工程技术2026，Vol.45Issue(2)：1-10,10.DOI:10.12158/j.2096-3203.2026.02.001
一种宽增益准Z源开关电容多电平电压源型逆变器
A wide-gain quasi-Z-source switched capacitor multi-level voltage source inverter
摘要
Abstract
Renewable energy such as wind power,photovoltaics require power inversion to generate stable AC voltage for connection to loads or the grid.As a core device in renewable energy power conversion systems,inverters are required to meet the application demands of high efficiency,high power density,and wide-range adjustable voltage gain.Traditional H-bridge inverter suffers from a high total harmonic distortion(THD)of the output AC voltage and no boosting capability.Recently the switched-capacitor multi-level inverter(SCMLI)excels in applications like renewable energy due to its high gain,self-balancing capabilities,low device voltage stress,and minimal output voltage harmonics.However existing SCMLIs are limited by their weak voltage modulation and high peak input pulse current.A novel quasi-Z-source single-phase SCMLI is proposed in this paper,offering a wide adjustable input voltage range,continuous and pulse-free input current,and scalability.Compared to similar topologies,the proposed topology requires fewer components and lower voltage stress,enabling direct conduction of the power switches in the output bridge arm of the quasi-Z-source circuit and supporting a wider input voltage range.Firstly,the working principle and parameter design method of the proposed topology are introduced.Based on this,the prototype system parameters are determined,and the correctness of the theoretical analysis is verified through simulation and experiments.The results indicate that the proposed topology can output high-quality seven-level AC with a wide input voltage range.The THD is as low as 23.8%,significantly lower than that of traditional two-level inverters,effectively improving the output power quality and reducing the size of the output filter.关键词
开关电容变换器/Z源变换器/多电平逆变器(MLI)/脉冲宽度调制(PWM)/宽电压范围变换器/电压源型逆变器Key words
switched-capacitor converter/Z-source converter/multi-level inverter(MLI)/pulse width modulation(PWM)/wide voltage range converter/voltage source inverter分类
信息技术与安全科学引用本文复制引用
李群,李强,汪成根,邹小明..一种宽增益准Z源开关电容多电平电压源型逆变器[J].电力工程技术,2026,45(2):1-10,10.基金项目
国家电网有限公司总部科技项目"含多构网型变流器的中远海风电场经柔直并网主动频率支撑关键技术"(5108-202218280A-2-241-XG) （5108-202218280A-2-241-XG）
