Abstract

Requiring a high number of power switches and their rating are the main limitations of multilevel converters in medium-voltage applications. The main objective of this paper is, introduce a reduced asymmetric basic module (RABM) for cascaded multilevel converters that require a less number of power switches and a lower total blocking voltage value in competition with other multilevel converter topologies. The proposed module comprises eight half-bridge converters that are connected in different ways to generate 63-level. The comparison results among the proposed module and other multilevel converters show that proposed module can generate a large number of levels with keeping constant the number of power switches. The simulation outcomes confirm the performance of the proposed module in both symmetric and asymmetric operation modes.

Highlights

  • M ULTI-LEVEL converters (MLC) are applied in medium-voltage applications due to low total harmonics distortion (THD), reduce the voltage rating by the power switches, no require LC filter and so on

  • In order to achieve a large number of levels the Neutral-point clamped (NPC) and FC multilevel converters need a large number of the diodes and capacitors, respectively

  • In order to confirm the performance of the proposed topology, the simulation of the sixty-three level is performed by MATLAB/Simulink

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Summary

Introduction

M ULTI-LEVEL converters (MLC) are applied in medium-voltage applications due to low total harmonics distortion (THD), reduce the voltage rating by the power switches (cause of use a high number of power switches), no require LC filter (when a large number voltage levels is available) and so on. They use in applications such as flexible AC power transmission systems (FACTS), renewable energy sources, AC motor drives etc, [1]–[3]. CHB-MLC requires many switches and isolated DC sources than NPC and FC converters [7]

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