IRO Journals
Journal of Electronics and Informatics

Simulation and Implementation of 7-Level and 27-Level Cascaded H-Bridge Multilevel Inverter for Reduced THD Under R and RL Loads

Open Access
Published: 19 May, 2026
Pages: 171-187
  • Amuthanantham K. , Amuthanantham K.
    Department of Electronics and Communication Engineering, Dr M.G. R. Educational and Research Institute, Chennai, India
    Department of Electronics and Communication Engineering, Dr M.G. R. Educational and Research Institute, Chennai, India
  • Elakkiya S. , Elakkiya S.
    Department of Electronics and Communication Engineering, Dr M.G. R. Educational and Research Institute, Chennai, India
    Department of Electronics and Communication Engineering, Dr M.G. R. Educational and Research Institute, Chennai, India
  • Chunchurambabu Chunchurambabu
    Department of Electronics and Communication Engineering, Dr M.G. R. Educational and Research Institute, Chennai, India
    Department of Electronics and Communication Engineering, Dr M.G. R. Educational and Research Institute, Chennai, India
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How to Cite

K., Amuthanantham, Elakkiya S., and Chunchurambabu. 2026. “Simulation and Implementation of 7-Level and 27-Level Cascaded H-Bridge Multilevel Inverter for Reduced THD Under R and RL Loads”. Journal of Electronics and Informatics 8 (2): 171-87. https://doi.org/10.36548/jei.2026.2.006.
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Keywords

MLI - Multilevel Inverter
CHB - Cascaded H-Bridge
THD - Total Harmonic Distortion
SPWM - Sinusoidal Pulse Width Modulation
MATLAB/Simulink
Renewable Energy
R Load
RL Load

Abstract

In this paper, 7 and 27 levels of cascaded H-bridge Multilevel Inverter systems are modeled and implemented, where different sub-MLI devices are interconnected in series for producing a large amount of power. The main objective in this work is to achieve a higher output voltage with less power switches. Renewable energy sources are mostly in DC form and hence should be converted properly in DC-AC to be connected to the grid. This is achieved by inverters, and multilevel inverters are preferred as they are able to produce high-quality AC. The CHB-MLI is one of the most common types due to its modularity, simplicity and high quality output, to name a few. The more the number of DC voltage levels, the better the output voltage waveform approaches a pure sinusoidal waveform, and thus lower the harmonic distortion. This research aims to achieve a close to sinusoidal output waveform and to analyse system performance in terms of comparing the Total Harmonic Distortion (THD) of different levels of CHB-MLIs. 7-level inverter is implemented in hardware and the 27-level inverter is designed and analysed using MATLAB/Simulink and hardware for both resistive (R) and resistive-inductive (RL) loads.

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