Abstract
In this study, two types of floating offshore wind turbine (FOWT) systems were proposed: a traditional tension leg platform (TLP) type and a new TLP type with additional mooring chains. They were both based on the National Renewable Energy Laboratory 5 MW offshore wind turbine model. Taking the coupled effect of dynamic response of the top wind turbine, tower support structure and lower mooring system into consideration, not only were the 1/60 scale model tests for the two floating wind turbine systems done in HIT’s wind-wave tunnel according to the typical design conditions in IEC61400-3 code, but also the numerical simulations corresponding to the scaled model tests were performed by advanced numerical tools. As a result, the numerical results displayed good agreement with the test data. Moreover, the additional mooring chains could play an active role in reducing the surge displacement, surge acceleration and typical tension leg force responses of the FOWT system, which is very beneficial for ensuring the good operational performance and the safety of the FOWT system.
Highlights
At present, the exploitation of offshore wind energy is becoming an important development direction of the wind energy industry
Taking the coupled dynamic responses of the top wind turbine, tower support structure and lower mooring system into consideration, the whole floating OWT support platform was simplified to be of six rigid-body modes of motion
Considering this work is just for the conceptual design of the floating offshore wind turbine (FOWT) system, the rotor wind loads are simplified into thrust forces, which are based on the wind loads information from the National Renewable Energy Laboratory (NREL) 5 MW wind turbine [14]
Summary
The exploitation of offshore wind energy is becoming an important development direction of the wind energy industry. Hederson [1] proposed a new five wind turbine semi-submersible floating platform system, and the performance of the new floating system was successfully studied by numerical methods. In the study of the single wind turbine floating system, Nielsen [5] used both numerical methods and 1/47 scale experimental tests to study the dynamic responses of the deep draft spar floating wind turbine, “Hywind”, whose feasibility was well proven. Roddier [12] proposed a new semi-submersible FOWT system with an additional water-entrapment plate structure, the motion performance and the structural strength of which was studied for the points of view of both numerical simulation and experimental tests. MW offshore wind turbine [14] Both 1/60 scale model tests and related numerical simulations of the two FOWT systems were done according to typical design cases in IEC61400-3 code [15]
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