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Low-voltage DC collection grids for marine current energy converters: Design and simulations

Author

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  • Fjellstedt, Christoffer
  • Forslund, Johan
  • Thomas, Karin

Abstract

Marine current energy represents a globally abundant yet largely untapped renewable energy source, offering greater predictability than other sources such as wind. Consequently, it has the potential to play a vital role in the green transition. A critical consideration for harnessing marine current energy is the design of the electrical grid to accommodate multiple turbines. Therefore, this paper presents a study that explores three types of DC collection grids (series, parallel, and star) for a specific marine current energy converter. A simulation model developed for the marine current energy converter is introduced and utilized to assess these topologies for grids comprising ten identical turbines subjected to varying water speeds. The designed topologies are intended for low-voltage and nearshore applications. The simulation results demonstrate that the series collection grid requires a significantly higher DC grid voltage compared to the other topologies for the turbines to operate correctly. Additionally, the study reveals that all three grid topologies can effectively transmit power to the distribution grid with similar power losses.

Suggested Citation

  • Fjellstedt, Christoffer & Forslund, Johan & Thomas, Karin, 2024. "Low-voltage DC collection grids for marine current energy converters: Design and simulations," Renewable Energy, Elsevier, vol. 235(C).
    • Handle: RePEc:eee:renene:v:235:y:2024:i:c:s0960148124013442
    DOI: 10.1016/j.renene.2024.121276
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