Power performance and motion characteristics of a floating hybrid wind-wave energy system

The integration of wave energy converters (WECs) onto a floating wind turbine platform optimizes the use of marine space and realizes the synergies between wave and wind energy. However, the dynamic coupling effects of the hybrid wind-wave energy systems are complex, and accurate numerical simulation tools are still lacking. This paper proposes a hybrid wind-wave energy system which combines multiple WECs and a wind turbine on a V-shaped floating platform. A fully coupled aero-hydro-servo-mooring-multibody numerical analysis framework is presented, which integrates the wind turbine modules in FAST, nonlinear PTO damping force calculated by Fortran, and hydrodynamic and mooring analysis in ANSYS-AQWA. The framework's ability to accurately simulate the complicated dynamic behavior of the hybrid energy system is verified through model experiments. A dynamic coupling model of the wind turbine-platform-floaters is constructed, and the motion response characteristics, mechanical properties, and wave energy capture performance of the hybrid wind-wave energy system are then studied based on the proposed coupling analysis framework. The study finds that the consideration of aerodynamic loads results in a significant mitigation of the surge motion response of the platform and in a shielding effect between the outer and inner floaters. These results provide a reference for the optimization and practical application of floating hybrid wind-wave energy systems.