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<p>The increasing integration of renewable energy systems, particularly photovoltaic and fuel cell sources, requires inverter topologies that are compact, efficient, and compliant with grid standards. However, conventional multilevel inverter structures often suffer from high switch count, increased voltage stress, and leakage current due to parasitic capacitances between the sources and ground. This paper proposes a new multilevel inverter based on a multisource switched-capacitor (SC) boosting architecture with a common-ground structure for grid-connected renewable energy applications. The proposed topology employs 10 switches and 2 switched-capacitor cells to generate a 9-level output voltage while enabling the integration of 2 independent DC sources. The SC network provides inherent voltage self-balancing through series–parallel reconfiguration, eliminating the need for additional balancing circuits and reducing system complexity. The effectiveness of the proposed inverter is validated through MATLAB/Simulink simulations and a laboratory-scale prototype under both open-loop and closed-loop control conditions. The results demonstrate that the inverter achieves a low total harmonic distortion of 0.69% at the output current, a high efficiency of 97.3%, and a reduced total standing voltage of 4.75&#xa0;p.u., while maintaining zero leakage current due to its common-ground configuration. These outcome indicates the suitability of the proposed structure for efficient and reliable grid connected renewable energy applications.</p>

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A dual-source nine-level power electronics interface with common-ground configuration for grid-connected hybrid renewable systems

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Yadvendra Singh,
  • Shakti Singh,
  • Krishna Kumar Gupta

摘要

The increasing integration of renewable energy systems, particularly photovoltaic and fuel cell sources, requires inverter topologies that are compact, efficient, and compliant with grid standards. However, conventional multilevel inverter structures often suffer from high switch count, increased voltage stress, and leakage current due to parasitic capacitances between the sources and ground. This paper proposes a new multilevel inverter based on a multisource switched-capacitor (SC) boosting architecture with a common-ground structure for grid-connected renewable energy applications. The proposed topology employs 10 switches and 2 switched-capacitor cells to generate a 9-level output voltage while enabling the integration of 2 independent DC sources. The SC network provides inherent voltage self-balancing through series–parallel reconfiguration, eliminating the need for additional balancing circuits and reducing system complexity. The effectiveness of the proposed inverter is validated through MATLAB/Simulink simulations and a laboratory-scale prototype under both open-loop and closed-loop control conditions. The results demonstrate that the inverter achieves a low total harmonic distortion of 0.69% at the output current, a high efficiency of 97.3%, and a reduced total standing voltage of 4.75 p.u., while maintaining zero leakage current due to its common-ground configuration. These outcome indicates the suitability of the proposed structure for efficient and reliable grid connected renewable energy applications.