Abstract
Platform stability is a fundamental requirement for floating offshore wind turbines (FOWTs). In this paper, a novel method for designing and optimising FOWT platforms is proposed based on the design concepts of semi-submersible and spar platforms. The method involves developing an integrated numerical model of the FOWT by considering the fully coupled effect. Therefore, a new fully submersible FOWT platform with inclined side columns is parametrically designed based on the parameters of the NREL 5 MW wind turbine. The superiority of the new fully submersible FOWT platform is verified by comparing the material cost and dynamic response of two typical floating platforms. In addition, the design principles of additional structures and the mooring system of the floating platform are systematically analysed. The positive results verify the proposed method, which has greater hydrodynamic performance and economic feasibility compared with traditional semi-submersible and spar platforms. The enhanced hydrodynamic performance of the platform also improves the dynamic response of the tower and platform. The design of additional structures and mooring systems for floating platforms must consider structural safety and economic feasibility. The findings reported in this paper provide new insights into offshore wind exploitation in deep water with a feasible novel platform for FOWTs.
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