Dynamic analysis of submerged tension leg platform combined with wave energy converters for different mooring configuration

Abstract

In the present study floating wind turbine combined with a wave energy converter is analysed deriving both wind and wave energy, and thus ensuring continuous supply of energy. The study combines a submerged tension leg platform (STLP) with heaving type point absorber wave energy converter (WEC). Submerged tension leg platform is stable in both transportation phase and operational phase. The point absorber WEC has a floater system having diameter smaller than the incident wave length. The floater tends to oscillate in one or more degrees of freedom (DOF) and absorbs energy by damping the floater motion and converting it into electrical energy. The study combines STLP floater with six wave energy converters in circular pattern. The time domain simulation is performed for the combined platform configuration using fully coupled aero-hydro-servo-elastic simulation tool FAST developed by NREL for different mooring line configuration. The analysis is performed to study the responses (surge, sway, heave, roll, pitch, yaw) for the combined configuration for wind and wave load conditions corresponding to North Atlantic Ocean. The tower base bending moment, shear force and the tension developed on the mooring lines of the combined platform is analysed along with the responses of the floating combined energy platform. The study performed is expected to provide an insight into the dynamic motions and structural integrity of the floating wind and wave concept under different survival conditions helping the designers to develop better design standards. © 2023 Author(s).