MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study
by Jigneshkumar Patel 1,* 
and Vijay Sood 2
Faculty of Engineering and Applied Science, Oshawa, L1G 0C5, Canada
* Author to whom correspondence should be addressed.
Journal of Engineering Research and Sciences, Volume 1, Issue 4, Page # 148-160, 2022; DOI: 10.55708/js0104017
Keywords: Cascaded H-bridge inverter, Harmonics, Power electronic, Pulse width modulation
Received: 25 February 2022, Revised: 06 April 2022, Accepted: 15 April 2022, Published Online: 22 April 2022
APA Style
Patel, J., & Sood, V. (2022, April). MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study. Journal of Engineering Research and Sciences, 1(4), 148–160. https://doi.org/10.55708/js0104017
Chicago/Turabian Style
Patel, Jigneshkumar, and Vijay Sood. “MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study.” Journal of Engineering Research and Sciences 1, no. 4 (April 2022): 148–60. https://doi.org/10.55708/js0104017.
IEEE Style
[1]J. Patel and V. Sood, “MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study,” Journal of Engineering Research and Sciences, vol. 1, no. 4, pp. 148–160, Apr. 2022, doi: 10.55708/js0104017.
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Abstract
Cascaded H-bridge multilevel inverters (CHB-MLI) are employed in a variety of medium/high power applications. These inverters are known to inject unwanted harmonics into the grid, which negatively affects the grid and connected loads. CHB-MLI topology can reduce many of these harmonics by producing multiple output voltage levels and improves the fundamental component using a suitable modulation technique. However, the CHB-MLI topology configuration requires multiple isolated input sources which must be balanced either with the modulation technique or with an additional method. This paper analyzes multi-carrier pulse width modulation (MC-PWM) techniques for CHB-MLIs. In this study, two basic configurations of CHB-MLI symmetrical and asymmetrical are reviewed, followed by their mathematical analysis. Also, this paper analyses multi-carrier based sinusoidal pulse width modulation (MC-SPWM) and multi-carrier based third-harmonic injected pulse width modulation (MC-THIPWM) techniques with phase-shifted (PS) and level-shifted (LS) carrier arrangements for the CHB-MLI. Moreover, a simulation study has been conducted using MATLAB Simulink to analyze the performance of MC-PWM techniques for the symmetrical and asymmetrical type CHB-MLIs. The 7-level and 9-level CHB-MLIs were evaluated for the stated MC-PWM techniques in terms of harmonics and fundamental components. In addition, discharging current of all input sources was checked to verify the ability of all MC-PWM techniques to balance all input sources.
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