Realization of a Nine-Level Cascaded NPC/H-Bridge PWM Inverter Using Phase-Shifted Carrier PWM Technique  

作　　者：Tom Wanjekeche Dan Valentin Nicolae Adisa Abdul Jimoh 

机构地区：[1]Department of Electrical Engineering, Tshwane University of Technology, Pretoria, Private Bag X680, South Africa

出　　处：《Journal of Energy and Power Engineering》2012年第8期1335-1342,共8页能源与动力工程（美国大卫英文）

摘　　要：Cascaded H-Bridge inverter has been researched for the past two decades, but there are no explicit guidelines on how one can realize a cascaded NPC （neutral-point-clamped）/H-Bridge inverter. Past research has also concentrated on realizing a five-level NPC/H-Bridge inverter. This fails to address the principle of realizing a general cascaded N-level NPC/H-Bridge PWM inverter. This paper proposes an improved topology for achieving a nine-level cascaded NPC （neutral-point-clamped） H-Bridge inverter with reduced harmonic content. This new proposed topology requires a lesser number of separate dc sources as compared to conventional cascaded H-Bridge inverter. The whole system is considered as having four three level legs having two positive and two negative legs. By properly phase shifting the modulating wave and carriers, a nine-level output is achieved. A theoretical harmonic analysis of the proposed inverter is carried out based on double Fourier principle. The theoretical results are verified through MATLAB simulation.

关 键 词：Harmonic content NPC/H-Bridge PWM inverter phase shifted carrier PWM technique three level inverter. 

分 类 号：TN86[电子电信—信息与通信工程] TM464[电气工程—电器]