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<p>This paper presents a novel Seven-Level Common-Ground Switched-Capacitor Boost Inverter (7L-CG-SCBI) topology with high efficiency, voltage boosting feature, and reduced leakage current for renewable energy applications. The proposed inverter employs a single DC source, three switched capacitors, eleven unidirectional switches, and one bidirectional switch to generate a seven-level output voltage with a gain of three. The capacitors achieve self-balancing without additional sensors or complex control, ensuring stable operation and reduced design complexity. The common ground structure effectively eliminates leakage currents, enhancing system safety and grid compatibility. A comprehensive analysis covering operating principles, modulation strategy, loss evaluation, and reliability assessment using a Markov model is presented. The simulation results in MATLAB/Simulink and experimental validation confirm the inverter’s higher efficiency (96.13%), low total harmonic distortion, and reliable performance of the inverter under varying load and frequency conditions. The compact configuration, self-balancing feature, and high reliability make the proposed 7L-CG-SCBI a promising solution for photovoltaic and other renewable energy systems.</p>

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Development and analysis of a seven-level common- ground switched-capacitor inverter topology

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月28日

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  • Adil Sarwar,
  • Samina Parween,
  • Mohammad Zaid,
  • Mohammed A. AlAqil,
  • Md Shafiul Alam,
  • Mohammad Ali

摘要

This paper presents a novel Seven-Level Common-Ground Switched-Capacitor Boost Inverter (7L-CG-SCBI) topology with high efficiency, voltage boosting feature, and reduced leakage current for renewable energy applications. The proposed inverter employs a single DC source, three switched capacitors, eleven unidirectional switches, and one bidirectional switch to generate a seven-level output voltage with a gain of three. The capacitors achieve self-balancing without additional sensors or complex control, ensuring stable operation and reduced design complexity. The common ground structure effectively eliminates leakage currents, enhancing system safety and grid compatibility. A comprehensive analysis covering operating principles, modulation strategy, loss evaluation, and reliability assessment using a Markov model is presented. The simulation results in MATLAB/Simulink and experimental validation confirm the inverter’s higher efficiency (96.13%), low total harmonic distortion, and reliable performance of the inverter under varying load and frequency conditions. The compact configuration, self-balancing feature, and high reliability make the proposed 7L-CG-SCBI a promising solution for photovoltaic and other renewable energy systems.