International Journal of Scientific Research and Engineering Development

Multilevel inverters have become an essential technology in modern power electronics due to their ability to produce high-quality output voltage with reduced harmonic distortion and lower switching losses. Among various multilevel inverter topologies, the Cascaded H-Bridge (CHB) inverter has gained considerable attention because of its modular structure, simple control strategy, and excellent voltage quality. This paper presents a Modified Cascaded H-Bridge 5-Level Inverter designed to improve output waveform quality while reducing the Total Harmonic Distortion (THD) and component count compared with conventional topologies. The proposed inverter utilizes an optimized switching strategy to generate five distinct voltage levels (+Vdc, +Vdc/2, 0, –Vdc/2, and –Vdc), resulting in a staircase waveform that closely approximates a sinusoidal output. The system is modeled and analyzed using MATLAB/Simulink to evaluate its steady-state performance under different loading conditions. Performance parameters such as output voltage, output current, inverter efficiency, switching losses, THD, and voltage regulation are investigated. Simulation results demonstrate that the proposed modified topology significantly improves power quality, enhances system efficiency, and minimizes harmonic distortion while maintaining a simple and cost-effective design. The modular architecture also enables easy scalability for medium- and highpower applications. The proposed inverter is suitable for renewable energy systems, industrial motor drives, uninterrupted power supplies (UPS), electric vehicle power converters, and smart grid applications where reliable and efficient power conversion is required.

Sushant Y. Suryawanshi, Gayatri Ajit Jadhav, Kiran Prakash Patil, Prachi Nandkumar Gurav, Sopiya Ahmad Pathan, Pradnya Rajendra Ranbhise,"Modified Cascaded H-Bridge 5-Level Inverter for Improved Power Quality and Reduced Harmonic Distortion" International Journal of Scientific Research and Engineering Development, V9(4): Page(25-30) May-June 2026. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.