A New Cascaded Multilevel Inverter for Modular Structure and Reduced Passive Components

Author:

Das Durbanjali1,Mahato Bidyut2,Chandan Bikramaditya3ORCID,Joshi Hitesh2,Mahto Kailash Kumar1,Das Priyanath1,Fotis Georgios45ORCID,Vita Vasiliki4,Mann Michael6ORCID

Affiliation:

1. Department of Electrical Engineering, National Institute of Technology, Agartala 799046, India

2. Department of Electrical and Electronics Engineering, Galgotias College of Engineering & Technology, Greater Noida 201310, India

3. Department of Electrical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India

4. Department of Electrical and Electronics Engineering Educators, ASPETE—School of Pedagogical and Technological Education, 14121 Heraklion, Greece

5. Centre for Energy Technologies, Aarhus University, Birk Centerpark 15, Innovatorium, 7400 Herning, Denmark

6. Department of Engineering, University of Applied Sciences Aschaffenburg, 63743 Aschafenburg, Germany

Abstract

In high-power applications, achieving adequate power quality in power converter design is accomplished by utilizing multilevel inverters instead of using two-level and three-level inverters. The device generates a sinusoidal output voltage, which results in reduced total harmonic distortion and lower voltage stress on the switches and leads to lower electromagnetic interference, making it suitable for use in renewable energy applications. However, to illustrate the advantages mentioned above, a significant number of switching devices and DC sources are necessary while raising the voltage levels. This article proposes an asymmetrical voltage generation method, which operates in a ratio of 1:5 and generates 25 levels using 11 power switches. The topology is modular in structure, and each module has a lower component count, which significantly reduces the overall cost. The proposed topology is capable of generating negative output voltage levels without the use of an H-bridge configuration, where only three switches are used to generate any voltage levels. The functionality of the developed module is amended by fixing different voltage values in DC sources. This article also presents a comprehensive examination of the circuit and the functioning of various voltage levels. The advantages of the proposed inverter have been demonstrated by comparative research with the currently existing MLI topologies. Ultimately, both the simulation and experimental findings validated the practical capabilities.

Publisher

MDPI AG

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