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<p>This study explores the use of a multi-level semi-active liquid column gas damper (SALCGD) system, incorporating two distinct semi-active control strategies, to reduce vibrations in a semi-submersible floating offshore wind turbine (FOWT). The two control approaches investigated are the variable-frequency method and the variable-head-loss-coefficient method. The research primarily focuses on modeling the SALCGD-FOWT system within the Simulink-MATLAB simulation environment. The proposed multi-level SALCGD configuration includes two differently scaled dampers: one embedded within the semi-submersible platform and the other installed in the wind turbine’s nacelle. Control algorithms implemented in this study include velocity-based ground hook (VBG), displacement-based ground hook (DBG), and bang-bang control. Hydrodynamic analysis was conducted using ANSYS-AQWA, while the coupled SALCGD-FOWT system and aerodynamic responses were simulated using Simulink-MATLAB and the FAST tool, respectively. The findings indicate that the variable-head-loss-coefficient method is more effective in reducing displacement responses, whereas the variable-frequency method performs better in minimizing acceleration. Moreover, the semi-active damper outperforms the passive damper, especially in reducing acceleration. Overall, the variable-frequency approach proves particularly suitable for moderate sea states.</p>

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Enhancing Dynamic Performance of OC4-DeepCwind Semi-submersible Floating Wind Turbine Utilizing Multi-level Semi-active Dampers

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Reza Dezvareh,
  • Ali Nazokkar

摘要

This study explores the use of a multi-level semi-active liquid column gas damper (SALCGD) system, incorporating two distinct semi-active control strategies, to reduce vibrations in a semi-submersible floating offshore wind turbine (FOWT). The two control approaches investigated are the variable-frequency method and the variable-head-loss-coefficient method. The research primarily focuses on modeling the SALCGD-FOWT system within the Simulink-MATLAB simulation environment. The proposed multi-level SALCGD configuration includes two differently scaled dampers: one embedded within the semi-submersible platform and the other installed in the wind turbine’s nacelle. Control algorithms implemented in this study include velocity-based ground hook (VBG), displacement-based ground hook (DBG), and bang-bang control. Hydrodynamic analysis was conducted using ANSYS-AQWA, while the coupled SALCGD-FOWT system and aerodynamic responses were simulated using Simulink-MATLAB and the FAST tool, respectively. The findings indicate that the variable-head-loss-coefficient method is more effective in reducing displacement responses, whereas the variable-frequency method performs better in minimizing acceleration. Moreover, the semi-active damper outperforms the passive damper, especially in reducing acceleration. Overall, the variable-frequency approach proves particularly suitable for moderate sea states.