Performance Analysis of a High Gain Quasi Z-Source Network Based Cascaded H-Bridge Multi-level Inverter

Abstract

AbstractThis paper presents a High Gain quasi-Z-Source Network (HG-qZSN) integrated with Cascaded H-Bridge Multi-level Inverter (CHB-MLI) used for renewable energy source applications. The proposed system consists of two quasi Z-source switched capacitor networks and five-level CHB-MLI with eight power switches. The proposed five-level CHB-MLI uses a two HG-qZSN for DC-DC conversion which gives a very high voltage gain or boost factor when compared to conventional boost converters. A five-level CHB-MLI can have the superior performance using sine Pulse Width Modulation (PWM) which is used for DC–AC conversion to provide an efficient conversion and hence suitable for renewable energy applications. In addition, the proposed HG-qZSN based CHB-MLI has modular circuit layout and can be easily extended to higher levels. Simulations are carried out for five-level HG-qZSN based CHB-MLI using MATLAB/Simulink for different duty cycles i.e., 0.2, 0.3 and 0.4. The presented results support the theoretical analysis with a high gain or boost factor of 3, 4.25 and 8 for the 0.2, 0.3 and 0.4 duty cycles respectively.KeywordsCHB-MLIHG-qZSNPWMRenewable energy sources