Switched-capacitor Based Seven-level Boost Inverter with a Reduced Number of Devices  

作　　者：Weijie Lin Jun Zeng Bo Fu Zhixing Yan Junfeng Liu 

机构地区：[1]School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,China [2]WISDRI Engineering&Research Incorporation Limited,Wuhan 430074,China [3]Department of Energy,Aalborg University,Aalborg 9220,Denmark [4]School of Automation Science and Engineering,South China University of Technology,Guangzhou 510641,China

出　　处：《CSEE Journal of Power and Energy Systems》2024年第1期381-391,共11页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported by the National Natural Science Foundation of China under Grants 62173148 and 52377186,and Joint Laboratory of Energy Saving and Intelligent Maintenance for Modern Transportations。

摘　　要：The conventional multilevel inverters(MLIs)have the disadvantages of numerous devices,incapacity of boost,unbalance for capacitor’s voltage,high complexity for control,and etc.Motivated by this issue,a seven-level boost inverter(7LBI)based on a switched capacitor is presented for singlephase applications in this paper.The proposed 7LBI using only seven transistors can achieve seven output levels,1.5 voltage gain,and natural balance of capacitors’voltages without sensors or other auxiliary methods,which illustrates its suitability for the applications of renewable energy generation.The configuration of topology and operating principles are illustrated in detail.The natural balance of capacitors and capacitance calculations are deduced as well.Moreover,the comparative study is conducted for different types of MLIs.The results illustrate the merits of the proposed 7LBI with respect to reduced devices,lower voltage stress,and less power loss.Finally,a simulation for the proposed 7LBI with PWM modulation is realized based on the theoretical analysis;an experimental prototype is also implemented,verifying multilevel output,boost ability,natural balance for switched capacitors,and performance of transient response.

关 键 词：Multilevel inverters voltage gain natural balance renewable energy generation reduced number of elements 

分 类 号：TM464[电气工程—电器]