Generalized Switched-Capacitor Step-up Multilevel Inverter Employing Single DC Source  

作　　者：Yaoqiang Wang Kaige Wang Gen Li Fengjiang Wu Kewen Wang Jun Liang 

机构地区：[1]the School of Electrical Engineering,Zhengzhou University,Zhengzhou 450001,China [2]the Henan Engineering Research Center of Power Electronics and Energy Systems,Zhengzhou 450001,China [3]Zhengzhou University,Zhengzhou 450001,China [4]Zhoukou Power Supply Company,State Grid Henan Electric Power Co.,Ltd.,Zhoukou 466000,China [5]Cardiff University,Cardiff CF243AA,U.K [6]the Department of Electrical Engineering,Harbin Institute of Technology,Harbin 150001,China

出　　处：《CSEE Journal of Power and Energy Systems》2022年第2期439-451,共13页中国电机工程学会电力与能源系统学报（英文）

基　　金：This work was supported in part by the National Natural Science Foundation of China under Grant 51507155;in part by the Youth key Teacher Project of Henan Higher Educational Institutions under Grant 2019GGJS011.

摘　　要：In this paper,a new generalized step-up multilevel DC-AC converter is proposed,which is suitable for applications with low-voltage input sources,such as photovoltaic power generation and electric vehicles.This inverter can achieve a high voltage gain by controlling the series-parallel conversion of the DC power supply and capacitors.Only one DC voltage source and a few power devices are employed.The maximum output voltage and the number of output levels can be further increased through the switched-capacitor unit’s extension and the submodule cascaded extension.Moreover,the capacitor voltages are self-balanced without complicated voltage control circuits.The complementary operating mechanism between each pair of switches simplifies the modulation algorithm.The inductiveload ability is fully taken into account in the proposed inverter.Additionally,a remarkable characteristic of the inverter is that the charging and discharging states among different capacitors are synchronous,which reduces the voltage ripple of the frontend capacitors.The circuit structure,the working principle,the modulation strategy,the capacitors and losses analysis are presented in detail.Afterwards,the advantages of the proposed inverter are analyzed by comparing with other recently proposed inverters.Finally,the steady-state and dynamic performance of the proposed inverter is verified and validated by simulation and experiment.

关 键 词：Modulation strategy multilevel inverter single DC source switched capacitor voltage self-balancing 

分 类 号：TM464[电气工程—电器]