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<p>Floating offshore wind turbines (FOWT) are susceptible to the coupled effects of wind, waves, and other environmental forces in marine settings, making platform stability a critical issue in design. This paper proposes a multi-objective optimization method for the design of FOWT platforms. The method utilized a structural scaling factor approach; dimensions of the NAUTILUS 10&#xa0;MW FOWT platform are scaled up to accommodate a 15&#xa0;MW wind turbine. Second, a multi-objective optimization mathematical model for the NAUTILUS 15&#xa0;MW FOWT platform is established based on hydrodynamic theory, which coupled OpenFast and AWQA is employed to optimize RAO in the surge, heave, and pitch directions. The optimized results show that minimizing the RAO can make significant improvements in the dynamic response of the FOWT. Specifically, at the rated condition, the fluctuations in surge, heave, and pitch directions were reduced, with mean values of surge and pitch motions decreasing by 5.148% and 14.351%, respectively. Consequently, the fore-aft tower base moment was reduced by 7.843%, and the power output of the wind turbine increased by 1.101%. The flapwise blade root bending moment and tip deflection exhibited insignificant changes, suggesting a minimal impact on the blade’s aeroelastic responses. Additionally, the natural frequencies of the wind turbine with the optimized platform were verified to comply with design criteria, with the 1st fore-aft and side–side frequencies of the tower effectively avoiding the 1P and 3P frequencies, which can mitigate the risk of resonance. Overall, the IEA 15&#xa0;MW wind turbine mounted on the optimized platform exhibits better stability under both normal and extreme wind conditions.</p>

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Multi-objective optimization design of the NAUTILUS-15 MW floating wind turbine platform

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Quan Wang,
  • Zhenhai Wang,
  • Haoran Zhang,
  • Minghao Zuo,
  • Xiaodi Wang,
  • Yang Ni,
  • Peng Cheng

摘要

Floating offshore wind turbines (FOWT) are susceptible to the coupled effects of wind, waves, and other environmental forces in marine settings, making platform stability a critical issue in design. This paper proposes a multi-objective optimization method for the design of FOWT platforms. The method utilized a structural scaling factor approach; dimensions of the NAUTILUS 10 MW FOWT platform are scaled up to accommodate a 15 MW wind turbine. Second, a multi-objective optimization mathematical model for the NAUTILUS 15 MW FOWT platform is established based on hydrodynamic theory, which coupled OpenFast and AWQA is employed to optimize RAO in the surge, heave, and pitch directions. The optimized results show that minimizing the RAO can make significant improvements in the dynamic response of the FOWT. Specifically, at the rated condition, the fluctuations in surge, heave, and pitch directions were reduced, with mean values of surge and pitch motions decreasing by 5.148% and 14.351%, respectively. Consequently, the fore-aft tower base moment was reduced by 7.843%, and the power output of the wind turbine increased by 1.101%. The flapwise blade root bending moment and tip deflection exhibited insignificant changes, suggesting a minimal impact on the blade’s aeroelastic responses. Additionally, the natural frequencies of the wind turbine with the optimized platform were verified to comply with design criteria, with the 1st fore-aft and side–side frequencies of the tower effectively avoiding the 1P and 3P frequencies, which can mitigate the risk of resonance. Overall, the IEA 15 MW wind turbine mounted on the optimized platform exhibits better stability under both normal and extreme wind conditions.