Abstract

In this paper, a new basic unit for the cascaded multilevel inverter is proposed. By series-connected numbers of the proposed basic unit, a new cascaded multilevel inverter is also proposed. In order to generate all (even and odd) voltage levels two new algorithms to determine the magnitude of dc voltage sources are proposed. Then, this inverter is compared with several conventional cascaded multilevel inverters that have been presented in the literature. Based on these comparisons, the proposed inverter is able to generate a higher number of output levels by using a lower number of power electronic devices, dc voltage sources and minimum variety of the value of dc voltage sources. As a result, high efficiency, reducing the size and cost of the inverter is the other advantages of the proposed inverter. Finally, the accuracy performance of the proposed cascaded inverter to generate all voltage levels is verified through experimental results on a 49-level inverter in a laboratory prototype.

Highlights

  • A multilevel inverter is a power electronic converter that generates desired ac output levels by using several dc voltage sources as inputs [1]

  • In order to increase the number of output levels, different algorithms to determine the magnitudes of the dc voltage sources in the H-bridge have been presented in [11], [12]

  • The main problems of the symmetric cascaded inverters is a high number of required integrated gate bipolar transistors (IGBTs), dc voltage sources, power switches, and driver circuits by increasing the number of generated output levels because of its low magnitude of dc voltage sources

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Summary

INTRODUCTION

A multilevel inverter is a power electronic converter that generates desired ac output levels by using several dc voltage sources as inputs [1]. A high number of required dc voltage sources and semiconductor power switches by increasing the number of generated output levels are disadvantageous of this inverter [9], [10]. In order to increase the number of output levels, different algorithms to determine the magnitudes of the dc voltage sources in the H-bridge have been presented in [11], [12]. The main problems of the symmetric cascaded inverters is a high number of required integrated gate bipolar transistors (IGBTs), dc voltage sources, power switches, and driver circuits by increasing the number of generated output levels because of its low magnitude of dc voltage sources. All of other topologies have their own advantages in this paper, in order to increase the number of output levels by using a lower number of power electronic devices and dc voltage sources, a new basic unit is proposed. The accuracy performance of the proposed inverters is reconfirmed by using experimental results on a 49-level proposed inverter

PROPOSED BASIC UNIT
SUGGESTED CASCADED MULTILEVELINVERTER
Second Proposed Method
COMPARISON OF THE PROPOSED CASCADED INVERTERS WITH MULTILEVEL INVERTERS
Topology Method
40 Nlevel 60
EXPERIMENTAL VALIDATIONS
CONCLUSION

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