A 10MW reference floating offshore wind platform has been specially adapted for the TRL+ as an example of current and future trends in the floating offshore wind sector where multi-megawatt concepts are being developed.
The floating offshore wind turbine studied during the TRL+ project is an in-house upscaling of the DeepCWind platform in order to support a 10 MW wind turbine. The floater consists of four columns, one central column which supports the wind turbine and three exterior columns which gives the stability. All the four columns are joined by means of braces which has a diameter one order of magnitude lower than the four main columns. The DeepCWind platform was upscaled in order to have the necessary stability and good operability. In the upscaling process the evolution of the structural weight was taken into account. The wind turbine used is the 10 MW DTU wind turbine which has a tower of 119 meters and a rotor diameter of 178 meters and it is able to generate a thrust of 150 tons. The mooring system has been recalculated in order to fit Bimep conditions. The mooring system design is in accordance with DNV-OS-J103 rule.
The TRL+ floating offshore wind concept has been fully tested at laboratory scale. The tests have been carried out in the Cantabrian Coastal and Ocean Basin (CCOB) managed by IHCantabria and part of the TRL+ consortium facilities. The test program has a very ambitious scope including coupled wave, wind and current action over the floating structure to analyze the dynamic response of the platform due to turbulent and constant wind, second order wave forces, etc.
Wind forces have been reproduced by using the IHCantabria’s technology. A multi-fan system able to reproduce the wind turbine control strategy (Meseguer & Guanche, 2019). The hydrodynamic performance of the platform has been addressed assessing motions, loads over mooring lines, nacelle accelerations, etc. The experimental database has been used to calibrate and validate the virtual model of the floating platform including the high complexity of coupled environmental loads.