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Conventional modulation techniques used in cascaded H-bridge multilevel (CHB) DC/AC converters often spawn the noticeable quantity of harmonics of low frequency in an output voltage. The latter usually leads to a high-peak output current, impacting adversely on performance and reliability of industrial motor drive systems. To tackle these drawbacks, this research develops an improved Multicarrier Pulse-Width Modulation (MCPWM) method based on an alternative Phase Opposition Disposition (APOD) approach. A proposed MCPWM method significantly mitigates harmonic content in an output AC voltage by keeping the continuous output current with reduced peak magnitude. A harmonic mitigation algorithm is presented, which dynamically modifies switching frequency and modulation index of semiconductor devices based on a switching angles of a MCPWM pulse. An algorithm specially deals with a 5th, 7th and 11th-order harmonics and reveals a novel range of switching angles, at which their amplitudes become minimal. One of the significant achievements of this work is the development of a novel real-time switching angle estimation technique which avoids solving complex nonlinear equations. This approach reduces not only computation time but also hardware complexity, hence making medium-capacity FPG an implementation viable. A proposed technique is authenticated by theoretical analysis, MATLAB/Simulink simulations, and exploratory verification using the three-phase FPGA-based CHB multilevel inverter prototype. Comparative analysis against state-of-the-art techniques will reveal superior efficacy of a proposed technique in terms of harmonic suppression, computational efficiency, and hardware simplicity, thus making it a practical solution for industrial power electronics applications.
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Copyright © 2025, This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC-BY-NY-SA). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Corresponding Author: K JEEVAN REDDY, jeevanreddyeee1045@mtieat.org
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
Conflict of interest: The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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