一种基于开关电容的九电平逆变器  

A Nine-Level Inverter Based on Switched-Capacitor

作　　者：陈思哲[1] 徐梦然 范元亮 常乐 杨苓 Chen Sizhe;Xu Mengran;Fan Yuanliang;Chang Le;Yang Ling(School of Automation Guangdong University of Technology,Guangzhou 510006 China;State Grid Fujian Electric Power Research Institute,Fuzhou 350007 China)

机构地区：[1]广东工业大学自动化学院,广州510006 [2]国网福建省电力有限公司电力科学研究院,福州350007

出　　处：《电工技术学报》2022年第4期931-941,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(61802070);国家电网有限公司总部科技项目(521304190072);广东省基础与应用基础研究基金项目(2019A1515110768)资助。

摘　　要：基于开关电容的多电平逆变器具有电路拓扑简单和电容电压自动平衡等优点。然而,现有开关电容型多电平逆变器存在元器件数量较多和电压应力较大等缺点。针对这些问题,该文提出一种九电平逆变器,该电路通过较少的元器件数量和较低的元器件电压应力实现了4倍升压的九电平输出,具有较低的成本和较小的体积;结合最近电平逼近法和基频调制策略来产生开关控制信号,通过开关管的有序通断实现良好的交流电输出。对九电平逆变器的工作原理、调制策略和电路参数等方面进行详细分析,最后搭建一台样机进行实验,证明了所提出电路的有效性和可行性。Multilevel inverters based on switched-capacitor have the advantages of simple circuit topology and self-balancing of capacitor voltages.However,the existing switched-capacitor based multilevel inverter has a large number of components and large voltage stress.For this reason,this paper proposes a nine-level inverter.The circuit achieves quadruple boost nine-level output through a smaller number of components and lower voltage stress,and has a lower cost and volume.Combining the nearest level modulation and the fundamental frequency modulation,the switch control signals are generated.Moreover,the satisfied AC(Alternating Current)output is realized through the orderly on-off of switches.The operation principle,modulation strategy and circuit parameters of proposed inverter are analyzed in detail.Finally,a prototype is built for experiment to prove the effectiveness and feasibility of proposed inverter.

关 键 词：多电平逆变器 开关电容 电容自均压 升压 

分 类 号：TM464[电气工程—电器]