Page 123 - IJEEE-2023-Vol19-ISSUE-1

Received: 07 February 2023 Revised: 27 February 2023 Accepted: 28 February 2023
DOI: 10.37917/ijeee.19.1.15
Vol. 19| Issue 1| June 2023

Ð Open Access

Iraqi Journal for Electrical and Electronic Engineering

Original Article

A Fifteen Levels Inverter with A Lower Number of
Devices and Higher Performance

Osama Y. K. Al-Atbee*, Basim T. Kadhem, Sumer S. Harden, Khalid M. Abdulhassan
Electrical Engineering Department, University of Basrah, Basrah, Iraq

Correspondence
*Osama Y. K. Al-Atbee
Electrical Engineering Department£

University of Basrah, Basrah, Iraq.

Email: usama.khader@uobasrah.edu.iq

Abstract
Multi-level inverters, as a result of the significant contributions they have made to the fields of high voltage and renewable
energy applications, MLI has earned a prestigious place in the field of industrial electronics applications. The use of MLI
makes it possible to generate an alternating voltage from a DC voltage or from voltages that are continuously applied thanks
to this capability. The quality of the produced wave depends on minimizing the level of total harmonic distortion (THD) in the
ensuing output voltage. Increasing the total number of levels is required in order to bring down the THD. The bigger the
number of layers, the lower the THD. On the other hand, this necessitates an increase in the number of power switches that
are utilized, in addition to an increase in the number of DC sources for certain types. A greater number of levels are achieved
in this work with a reduced number of switches, and the DC source necessitates the use of specialized control over the switches
as well as the grading of the DC source values. In order to demonstrate that the suggested converter achieves the needed
outcomes, the MATLAB simulator is utilized.

KEYWORDS: Inverter, Multi-level inverters, THD reduction, SPWM.

I. INTRODUCTION topologies are included in this category: The cascade multi-
level inverter is the one that requires the least amount of
Multilevel inverters are commonly used today because of work to put together and has the fewest number of individual
their voltage operation and functional versatility. The output parts.
is generated by a multilayer inverter, which draws power
from many DC sources. With an increasing number of DC Most of the time, a cascade MLI is built using a series
sources and a constant switching frequency, the inverter's of DC sources and switches that are sequentially connected
voltage output waveform can be made to seem almost to one another [9]-[11].
sinusoidal [1]-[4].
The optimal performance of the vast majority of electrical To get the fundamental voltage and get rid of the higher-
applications can be ensured by utilizing a supply that order harmonics in the output, the switches have to be turned
generates a sinusoidal waveform. The output voltage gets on and off repeatedly so that alternating current voltage can
closer to having the shape of a sinusoidal wave as the number be generated with several levels. This is necessary to
of inverter levels gets higher, which results in a decrease in accomplish [12].
the amount of total harmonic distortion (THD). Several DC sources contribute to its reduced switching
The multi-level inverter has a number of advantages over losses and stress on the voltage supply. Multilevel inverters
the hard-switched, two-level pulse width modulation (PWM) continue to be implemented in a growing number of facilities
inverter. These benefits include a decreased dv/dt during because of their low EMI output, high efficiency, and low
high power operations as well as an increase in efficiency switching losses in addition to their high voltage operation
[5]-[8]. capacity.
Multiple levels are represented by the inverter's first three
Three main types of topologies are used for multi-level settings [13]. Multilevel inverters are becoming more
inverters: cascade, diode clamp, and capacitor clamp. common in power electronic applications as a result of the
Cascade is the most common topology. The following higher requirements for power quality and power rating

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and

reproduction in any medium, provided the original work is properly cited.

© 2023 The Authors. Published by Iraqi Journal for Electrical and Electronic Engineering by College of Engineering, University of Basrah.

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