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Digital PWM-Controlled Seven-Level Symmetrical Multilevel Inverter for Improved Power Quality and Efficiency
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Keywords
Multilevel inverter
PWM control
series-parallel inverter
digital logic
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Abstract
The development of multilevel inverters (MLIs) has become pivotal in the integration of renewable energy systems and efficient power conversion for modern electrical networks. This study introduces a seven-level symmetrical series/parallel multilevel inverter incorporating a pulse-width modulation (PWM) technique controlled via digital logic circuits. The proposed design aims to reduce total harmonic distortion (THD), improve power quality, and ensure scalability for grid-tied renewable energy applications. The paper evaluates inverter performance under varying load and renewable generation conditions, demonstrating superior voltage waveform quality, efficient switching, and adaptability. Experimental and simulation results confirm the proposed topology’s effectiveness in enhancing energy efficiency, voltage regulation, and harmonic mitigation. Key contributions include a hybrid control scheme integrating series-parallel architecture with optimized PWM strategies and digital logic implementation, providing a robust solution for both industrial and grid-connected renewable energy systems.
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