Performance Analysis and Harmonic Optimization of a 21-Level Cascaded H-Bridge Multilevel Inverter Using Low-Frequency Modulation Techniques
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International Journal of Recent Engineering Science (IJRES) |  |
| © 2025 by IJRES Journal | ||
| Volume-12 Issue-2 |
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| Year of Publication : 2025 | ||
| Authors : Radwan. M.AL Bouthgy, Hager.AL Makaleh |
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| DOI : 10.14445/23497157/IJRES-V12I2P104 |
How to Cite?
Radwan. M.AL Bouthgy, Hager.AL Makaleh, "Performance Analysis and Harmonic Optimization of a 21-Level Cascaded H-Bridge Multilevel Inverter Using Low-Frequency Modulation Techniques," International Journal of Recent Engineering Science, vol. 12, no. 2, pp. 28-34, 2025. Crossref, https://doi.org/10.14445/23497157/IJRES-V12I2P104
Abstract
The increased application of renewable energy sources requires advanced power electronics for efficient energy conversion and grid integration. Multilevel inverters, particularly the Cascaded H-Bridge Multilevel Inverter (CHMLI), are leading contenders supplying high-quality power for medium- and high-voltage applications. The 21-level CHMLI offers scalability and high harmonic suppression, which makes it particularly suitable for renewable energy systems, industrial drives, and smart grids. The paper studies its performance using low-frequency modulation techniques to minimize THD. The simulation results show a significant reduction of harmonics with THD, which is as low as 0.35% current and 0.73% in voltage. Using unequal DC sources and LC filtering also improves efficiency, confirming the inverter's ability to handle complex loads. These results highlight significant optimizations for renewable energy applications at high power.
Keywords
Cascaded H-Bridge Multilevel Inverter (CHMLI), Total Harmonic Distortion (THD) Minimization, Low-Frequency Modulation Techniques, Harmonic Suppression and Power Quality Enhancement.
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