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<p>The inverters capable of boosting the voltage are essential for integrating the low-voltage renewable energy sources, such as photovoltaic and fuel cells. This eliminates the need for additional DC-DC converter units. In this paper, the authors proposed a novel nine-level inverter based on the switched capacitor technique, and it is characterized by modular structure. This modularity facilitates scalability to higher voltage levels, easy hardware implementation, and easy maintenance. The primary feature of this modular configuration is that the voltage stress across the switches is minimal, limiting the stress values significantly lower than the peak output voltage. This allows for the selection of switches with lower ratings, which significantly reduces the overall cost and power losses. The voltages of the capacitors in the switched capacitor circuits have the inherent self-voltage balancing without the use of complex control and additional circuitry. Furthermore, a comprehensive reliability analysis was conducted for the proposed inverter topology. The performance of the proposed topology is verified using MATLAB/Simulink and hardware prototype using dSPACE Controller. The maximum efficiency is found to be 98.4%. The results demonstrate that the proposed topology is reliable under different operating parameter variations and maintains low THD, which confirms its suitability to renewable energy applications.</p>

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Design of a novel reliable 9-level switched capacitor-based inverter with low voltage stress on the devices for renewable energy applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Satya Venkata Kishore Pulavarthi,
  • Chavvakula Naveen Kumar,
  • Katta Bharath,
  • Ch. N. Narasimha Rao,
  • S. Yuvaraja,
  • D. Anil Kumar,
  • P. Lakshmi Narayana

摘要

The inverters capable of boosting the voltage are essential for integrating the low-voltage renewable energy sources, such as photovoltaic and fuel cells. This eliminates the need for additional DC-DC converter units. In this paper, the authors proposed a novel nine-level inverter based on the switched capacitor technique, and it is characterized by modular structure. This modularity facilitates scalability to higher voltage levels, easy hardware implementation, and easy maintenance. The primary feature of this modular configuration is that the voltage stress across the switches is minimal, limiting the stress values significantly lower than the peak output voltage. This allows for the selection of switches with lower ratings, which significantly reduces the overall cost and power losses. The voltages of the capacitors in the switched capacitor circuits have the inherent self-voltage balancing without the use of complex control and additional circuitry. Furthermore, a comprehensive reliability analysis was conducted for the proposed inverter topology. The performance of the proposed topology is verified using MATLAB/Simulink and hardware prototype using dSPACE Controller. The maximum efficiency is found to be 98.4%. The results demonstrate that the proposed topology is reliable under different operating parameter variations and maintains low THD, which confirms its suitability to renewable energy applications.