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<p>This paper presents a novel seven-level multilevel inverter (MLI) topology that significantly reduces the number of electrical components while maintaining performance and reliability. The proposed configuration only employs six switches (consisting of one H-bridge unit and two auxiliary switches) along with two diodes, resulting in a substantial reduction in component count compared to conventional cascaded H-bridge inverters. This simplified structure decreases switching losses and enhances cost-effectiveness. In addition, it improves system dependability and streamlines the overall circuit architecture. A carrier-based pulse-width modulation (PWM) method using phase-disposition (PD) modulation is implemented to control the inverter, effectively delivering superior harmonic performance. Extensive modeling and experimental results validate the feasibility of the proposed system, demonstrating improved output-voltage quality and reduced total harmonic distortion (THD). Owing to its compact structure, high performance, and reduced component count, the proposed design offers an efficient and affordable solution for modern power-electronics applications that require high-quality multilevel voltage generation.</p>

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Design and experimental analysis of high-efficiency seven-level inverter for renewable power systems

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Dhana Prasad Duggapu,
  • Karthik Nagarajan

摘要

This paper presents a novel seven-level multilevel inverter (MLI) topology that significantly reduces the number of electrical components while maintaining performance and reliability. The proposed configuration only employs six switches (consisting of one H-bridge unit and two auxiliary switches) along with two diodes, resulting in a substantial reduction in component count compared to conventional cascaded H-bridge inverters. This simplified structure decreases switching losses and enhances cost-effectiveness. In addition, it improves system dependability and streamlines the overall circuit architecture. A carrier-based pulse-width modulation (PWM) method using phase-disposition (PD) modulation is implemented to control the inverter, effectively delivering superior harmonic performance. Extensive modeling and experimental results validate the feasibility of the proposed system, demonstrating improved output-voltage quality and reduced total harmonic distortion (THD). Owing to its compact structure, high performance, and reduced component count, the proposed design offers an efficient and affordable solution for modern power-electronics applications that require high-quality multilevel voltage generation.