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Photovoltaic to electrolysis off-grid green hydrogen production with DC–DC conversion

Author

Listed:
  • Renaudineau, Hugues
  • Llor, Ana M.
  • Hernandez, Matias S.
  • Concha, Diego
  • Wilson-Veas, Alan H.
  • Kouro, Samir

Abstract

Green hydrogen (H2), being the product of water electrolysis powered by renewable energy sources, is expected to be an energetic vector of major importance toward a more sustainable energy mix. In this context, photovoltaic (PV) -based H2 production is a key element, where power electronics technologies are critical to enable its development. In off-grid applications, designing DC–DC power electronics converters with high efficiency and high power density is really important since it can impact significantly the global performance of the H2 production system. In this work, a two-stage DC–DC power conversion system composed by an unregulated DCX converter and a regulated partial power converter is considered to increase the H2 production system efficiency. The DCX converter works in open-loop at resonant frequency with a high DC–DC conversion ratio. A partial power converter (PPC), which regulates only a fraction of the total power between its input and output terminals, represents a improvement in PV-to-H2 direct conversion, particularly since the PV panels do not require regulation from zero to nominal voltage, and in this work, is introduced for regulation of the DCX-based system, by optimizing the PV produced power through a maximum power point tracking (MPPT) algorithm along with the current control of the electrolyzer. A comparison with state-of-the-art converters show an important improvement of the proposed DCX with PPC regulated system. Compared to the solution with classical interleaved-buck pre-regulator, significant improvements in terms of efficiency for the whole range of operation are obtained, up to 2.5% higher with the proposed system. Experimental evaluation of the proposed PPC and DCX two stage converter for PV-powered electrolysis system is provided, validating its feasibility and interest for off-grid green hydrogen production application.

Suggested Citation

  • Renaudineau, Hugues & Llor, Ana M. & Hernandez, Matias S. & Concha, Diego & Wilson-Veas, Alan H. & Kouro, Samir, 2024. "Photovoltaic to electrolysis off-grid green hydrogen production with DC–DC conversion," Renewable Energy, Elsevier, vol. 237(PC).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124017555
    DOI: 10.1016/j.renene.2024.121687
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    References listed on IDEAS

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