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Safety assessment of offshore wind turbine hybrid base

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Document pages: 14 pages

Abstract: The tower and rotor nacelle are being expanded to meet the demand for higher total power generation of wind turbines. However, the substructure supporting these large offshore wind turbines expands and is affected by wave forces. In this study, the hybrid substructure is proposed to reduce the wave force by combining multi cylinders with different radii near the free surface and gravity substructures at the bottom of multi cylinders. In addition, because the static load of offshore wind turbine is very large, the reaction force acting on the substructure needs a very strong foundation. This means that pile-soil dynamic interaction must be fully considered. Therefore, ensoft group v7.0 is used to calculate the stiffness matrces on the pile-soil interaction conditions. These matrices are then used together with the loads at TP (Transition Piece) obtained from GH-Bladed for the structural analysis of the hybrid substructure by ANSYS ASAS. The structural strength and deformation are evaluated to derive an ultimate structural safety of the hybrid substructure for various soil conditions and show that the first few natural frequencies of the substructure are heavily influenced by the wind turbine. Therefore, modal analysis is carried out through GH-Bladed to examine the resonance between the wind turbine and the hybrid substructure.

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