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This paper deals with a novel concept by combining a tension leg platform -type floating wind turbine and a heavetype wave energy converter that is referred as the ‘TWWC’ (TLP-WT-WECCombination) system herein. Concept feasibility study has been carried out by using numerical simulations in the time domain. Hydrodynamic loads of the TLP and the WEC are calculated by the AQWA code, which is available for modeling multi-body systems including both mechanical and hydrodynamic couplings between the TLP and the WEC. The aerodynamic loads of the wind turbine are simplified as the thrust -wind speed fitting function based on the design data of NREL 5MW wind turbine with the consideration of the real-time motion of the TLP. Firstly, the effects of different power-take-off (PTO) parameters and wave periods on the performance of the WEC’s wave energy production under typical wave cases have been investigated, and a preliminary optimal value for the PTO’s damping stiffness has been proposed. Secondly, the main dynamic characteristic of the TWWC system under typical operational sea cases was investigated by using coupled wind-wave loads analysis. Finally, the maximum operational performance of the TWWC system under typical coupled wind and irregular sea case has been clarified, and the possible maximum transient wave power and maximum PTO's damping force have been obtained, which are very helpful for the optimal design of the PTO system Keywordscombined wind and wave power system; tension leg platform; power take off system; dynamic response

Operational Performance of a Combined TLP-type Floating Wind Turbine and Heave-type Floating Wave Energy Converter System