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Global design methodology for semi-submersible hulls of floating wind turbines

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  • Li, Wei
  • Wang, Shuaishuai
  • Moan, Torgeir
  • Gao, Zhen
  • Gao, Shan

Abstract

Designing the support structures for floating wind turbines (FWTs) involves a step-by-step process, typically in three phases, i.e., starting from concept selection and determining the overall dimensions for a given configuration, and finally, determining the detailed specifications. The global design of the hull is used to select the floater concept and determine the global dimensions for the subsequent detailed design. This global design process is a crucial part of the entire design cycle because it has a significant impact on the detailed design, which can be computationally expensive. However, because FWTs are still in the infancy stage of development, there is a lack of effective methods and procedures for determining the global dimensions of floaters. Additionally, the global response characteristics of different hull layouts are not yet well understood. To address these limitations, this paper deals with a global design of semi-submersible floaters to support large-scale wind turbines (using a 10-MW turbine as an example). The paper proposes and describes a methodology and procedures for the global design in detail, specifying criteria and values for a case study. Furthermore, a sensitivity study is conducted to determine the global dimensions of the floaters. Then, intact stability is studied to evaluate their safety in operation under wind loads. Subsequently, global aspects of structural design are analyzed based on wave-induced response amplitude operators (RAOs) of cross-sectional forces and moments, taking into account representative environmental conditions for an offshore site. These analyses provide a foundation for the subsequent detailed design. The results indicate that the spacing of the column centerline and the outer column radius are the most critical design variables for the global response of the semi-submersible hull. Moreover, increasing the outer column radius or freeboard can effectively enhance intact stability. In addition, the study highlights the importance of critical wave periods that cause splitting or prying force on the hull columns in the structural design. Finally, the main findings and conclusions are summarized. This study presents a simplified yet innovative methodology for the global design of mainstream semi-submersible hulls for FWTs. It addresses the lack of effective methods for determining global dimensions and provides valuable insights into the structural design considerations.

Suggested Citation

  • Li, Wei & Wang, Shuaishuai & Moan, Torgeir & Gao, Zhen & Gao, Shan, 2024. "Global design methodology for semi-submersible hulls of floating wind turbines," Renewable Energy, Elsevier, vol. 225(C).
  • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124003562
    DOI: 10.1016/j.renene.2024.120291
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    References listed on IDEAS

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    1. Giulio Ferri & Enzo Marino & Claudio Borri, 2020. "Optimal Dimensions of a Semisubmersible Floating Platform for a 10 MW Wind Turbine," Energies, MDPI, vol. 13(12), pages 1-20, June.
    2. Wang, Shuaishuai & Moan, Torgeir & Jiang, Zhiyu, 2022. "Influence of variability and uncertainty of wind and waves on fatigue damage of a floating wind turbine drivetrain," Renewable Energy, Elsevier, vol. 181(C), pages 870-897.
    3. Ho-Seong Yang & Ali Alkhabbaz & Dylan Sheneth Edirisinghe & Watchara Tongphong & Young-Ho Lee, 2022. "FOWT Stability Study According to Number of Columns Considering Amount of Materials Used," Energies, MDPI, vol. 15(5), pages 1-24, February.
    4. Ferri, Giulio & Marino, Enzo & Bruschi, Niccolò & Borri, Claudio, 2022. "Platform and mooring system optimization of a 10 MW semisubmersible offshore wind turbine," Renewable Energy, Elsevier, vol. 182(C), pages 1152-1170.
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