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Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency

Author

Listed:
  • Aditi Atul Desai

    (Electrical and Electronics Engineering Department, National Institute of Technology, Ponda 403401, India)

  • Suresh Mikkili

    (Electrical and Electronics Engineering Department, National Institute of Technology, Ponda 403401, India)

  • Tomonobu Senjyu

    (Department of Electrical and Electronics Engineering, University of Ryukyus, Okinawa 903-0213, Japan)

Abstract

Presence of a transformer in a grid connected photovoltaic system provides galvanic isolation between the photovoltaic panels and the grid. However, it increases the overall cost, makes the circuit bulky and reduces the efficiency of the system. Hence, transformerless inverters have gained significant importance owing to its low cost, light weight and increased efficiency. However, due to the absence of the transformer, there is no galvanic isolation between photovoltaic panels and the grid and there is always a threat of flow of leakage current. In this research paper, an elaborate analysis of H4, H5 and H6 transformerless inverter is carried out. DC side decoupled circuits are studied to eliminate the leakage current. Their performances are compared based on the simulations carried out in MATLAB/SIMULINK software. A novel H6 inverter is proposed by introducing an additional switch in H5 topology. A direct current path is provided in H5 topology during one of the active modes, so that current flows through few switches thereby reducing the conduction losses. Common mode voltage remains constant in the proposed H6 inverter and hence the leakage current is eliminated. The proposed H6 inverter can thus be a promising topology to eliminate leakage current and reduce conduction loss in the transformerless grid connected photovoltaic system.

Suggested Citation

  • Aditi Atul Desai & Suresh Mikkili & Tomonobu Senjyu, 2022. "Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency," Energies, MDPI, vol. 15(10), pages 1-22, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3789-:d:820671
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    References listed on IDEAS

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    1. Hani Albalawi & Sherif Ahmed Zaid, 2018. "An H5 Transformerless Inverter for Grid Connected PV Systems with Improved Utilization Factor and a Simple Maximum Power Point Algorithm," Energies, MDPI, vol. 11(11), pages 1-17, October.
    2. Zeb, Kamran & Uddin, Waqar & Khan, Muhammad Adil & Ali, Zunaib & Ali, Muhammad Umair & Christofides, Nicholas & Kim, H.J., 2018. "A comprehensive review on inverter topologies and control strategies for grid connected photovoltaic system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 1120-1141.
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    1. Manuel Flota-Bañuelos & Homero Miranda-Vidales & Bernardo Fernández & Luis J. Ricalde & A. Basam & J. Medina, 2022. "Harmonic Compensation via Grid-Tied Three-Phase Inverter with Variable Structure I&I Observer-Based Control Scheme," Energies, MDPI, vol. 15(17), pages 1-19, September.

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