Optimization of a Semisubmersible Floating Offshore Wind Turbine for the Oregon Coast via OpenFAST

Abstract

The increasing demand for renewable energy has driven advancements in floating offshore wind turbine (FOWT) technology, particularly for harnessing the vast wind energy potential in deep waters. This study focuses on optimizing the 5MW Semisubmersible FOWT for the Oregon coast, a region identified for its strong and consistent winds and deep-water depths. To accurately model the Oregon coast, three key environmental parameters - mean wind speed, maximum significant wave height, and mean water depth - were calibrated to reflect realistic and representative values. The optimization process targets three key physical parameters of the substructure: cylinder spacing, cylinder and pontoon diameter, and cylinder and pontoon thickness. Using the OpenFAST simulation tool, the study models the environmental conditions of the Oregon coast. Stress factors including nacelle acceleration, anchor tension, tilt angle, and tower base bending moment are analyzed in the findings. The findings show that a 30% increase in cylinder spacing reduces stress factors by 1.23~3.19%. Ultimately, this improves the stability and durability of the design.