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An Offshore Floating Wind–Solar–Aquaculture System: Concept Design and Extreme Response in Survival Conditions

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  • Xiangyuan Zheng

    (Division of Ocean Science and Technology, Tsinghua University, Shenzhen International Graduate School, Shenzhen 518005, China)

  • Huadong Zheng

    (Division of Ocean Science and Technology, Tsinghua University, Shenzhen International Graduate School, Shenzhen 518005, China
    Department of Civil Engineering, Tsinghua University, Beijing 100084, China)

  • Yu Lei

    (Division of Ocean Science and Technology, Tsinghua University, Shenzhen International Graduate School, Shenzhen 518005, China
    Department of Civil Engineering, Tsinghua University, Beijing 100084, China)

  • Yi Li

    (Division of Ocean Science and Technology, Tsinghua University, Shenzhen International Graduate School, Shenzhen 518005, China)

  • Wei Li

    (Powerchina Huadong Engineering Corporation Limited, Hangzhou 311122, China)

Abstract

This study presents a new concept design combining multiple megawatt (MW) vertical-axis wind turbines (VAWTs) and a solar array with a floating steel fish-farming cage. This combined wind–solar–aquaculture (WSA) system is intended to utilize the ocean space and water resources more effectively and more economically, while greatly shortening the payback period of investment in offshore power generation. The details of this WSA design are described, showing that a square-shaped fishing cage serves as a floating foundation for the 7600 m 2 solar array and four multi MW VAWTs. The WAMIT program based on potential-flow theory is employed to obtain the WSA’s motion response amplitude operators (RAOs) in sinusoidal waves of varying periods. The motion RAOs indicated that the proposed concept possesses better hydrodynamic seakeeping performances than its OC3Hywind spar and OC4DeepCwind semi-submersible counterparts. A potential site located in the northwest South China Sea is selected to deploy the WSA. Its feasibility is then examined in terms of the hydrodynamic motions and structural dynamic response driven by wind, waves, and current. Fully coupled time-domain simulations are carried out for 50-year survival conditions. The whole structure exhibits outstanding performance for its small motions in random wind and seas. Moreover, under these survival conditions, the top accelerations and tower base stresses of the VAWTs and mooring line tensions readily meet the design requirements. Technically, the WSA has strong competitiveness and wide prospects in the offshore industry for both power exploitation and marine aquaculture in intermediate and deep waters.

Suggested Citation

  • Xiangyuan Zheng & Huadong Zheng & Yu Lei & Yi Li & Wei Li, 2020. "An Offshore Floating Wind–Solar–Aquaculture System: Concept Design and Extreme Response in Survival Conditions," Energies, MDPI, vol. 13(3), pages 1-23, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:604-:d:314465
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    References listed on IDEAS

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    2. Charalampos Baniotopoulos, 2022. "Advances in Floating Wind Energy Converters," Energies, MDPI, vol. 15(15), pages 1-3, August.
    3. Michał Bernard Pietrzak & Bartłomiej Igliński & Wojciech Kujawski & Paweł Iwański, 2021. "Energy Transition in Poland—Assessment of the Renewable Energy Sector," Energies, MDPI, vol. 14(8), pages 1-23, April.
    4. Claus, R. & López, M., 2022. "Key issues in the design of floating photovoltaic structures for the marine environment," Renewable and Sustainable Energy Reviews, Elsevier, vol. 164(C).
    5. Francisco Haces-Fernandez, 2020. "Wind Energy Implementation to Mitigate Wildfire Risk and Preemptive Blackouts," Energies, MDPI, vol. 13(10), pages 1-19, May.
    6. Roman Gabl & Robert Klar & Thomas Davey & David M. Ingram, 2021. "Experimental Data of a Hexagonal Floating Structure under Waves," Data, MDPI, vol. 6(10), pages 1-16, September.

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