Vibration control of floating offshore wind turbine structure under wind-wave loads using the hybrid TMDI

The optimized control device effectively mitigates adverse vibrations in the floating offshore wind turbine structure induced by external environmental conditions.However, the deep-offshore environment is complex and exhibits high variability, especially during extreme events such as typhoons.Therefore, it is challenging to obtain optimal design parameters for the control device installed on the floating offshore wind turbine by only considering a single sea state or one extreme event.For illustrative purposes, based on a parameterized wind-wave field model combined with the CMA Tropical Cyclone Best Track Dataset and ERA5 measured data, two typical super-typhoon scenarios in a specific sea area were simulated.The vibration mitigation performance of the FOWT structure under extreme conditions was analyzed.Numerical results show that the cumulative distribution functions (CDFs) of extreme structural responses for the floating offshore wind turbine exhibit significant differences under different typhoon events.Additionally, they indicate that to ensure the robustness of the control device, the design must account for the impact of many typhoons in the entire sea area affecting the specific site.