Abstract
This study aimed to clarify upscaling and levelized cost of energy for offshore wind turbines supported by semi-submersible floating platform. Firstly, the upscaling rules of turbines, floaters and mooring lines are investigated, and the upscaling procedure is proposed based on the construction constraints and the static balance. Then, floater models are upscaled for 5, 10 MW turbines based on the semi-submersible floater for 2 MW turbine designed in Fukushima FORWARD project. By performing dynamic analyses, it is found that, the kinematic law for floaters is satisfied in the heave direction and relaxed in the surge and pitch direction. The dynamic similarity for mooring lines is satisfied by changing the mooring line quality. Finally, the levelized cost of energy is assessed by using engineering models and experience of demonstration projects. The initial cost is reduced 45 % and 57 % respectively for 5 MW and 10 MW comparing to 2 MW turbine.
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