PERFORMANCE EVALUATION OF SWITCHED-DIODE SYMMETRIC, ASYMMETRIC AND CASCADE MULTILEVEL CONVERTER TOPOLOGIES: A CASE STUDY

Abstract

In this paper, a precise study is presented on switched-diode symmetric, asymmetric and cascade multilevel converter topologies, which have been introduced and published recently. According to the published papers, these topologies have many advantages over other topologies in the same class. However, it is proved here that the mentioned switched-diode topologies suffer from main problems, which make them completely impractical. First, a brief study is presented on a typical sub-multilevel converter that consists of a basic unit and an H-bridge converter. Then, extended inverter topologies based on the switched-diode basic unit and their problems are studied. It is revealed in this section that the main problem is because of the basic unit. Finally, comprehensive experimental and simulation results are presented to validate the analysis. The simulations have been performed in MATLAB/SIMULINK environment.

Keywords

• Switched-capacitor
• Sub-multilevel inverter
• Symmetric
• Asymmetric
• cascaded