Preprints
https://doi.org/10.5194/wes-2021-148
https://doi.org/10.5194/wes-2021-148

  23 Dec 2021

23 Dec 2021

Review status: this preprint is currently under review for the journal WES.

Model tests of a 10 MW semi-submersible floating wind turbine under waves and wind using hybrid method to integrate the rotor thrust and moments

Felipe Vittori1, José Azcona1, Irene Eguinoa1, Oscar Pires1, Alberto Rodríguez2, Álex Morató2, Carlos Garrido2, and Cian Desmond3 Felipe Vittori et al.
  • 1National Renewable Energy Centre (CENER), Dept. Wind turbine analysis and design, ciudad de la innovación, 7, Sarriguren (Navarra), 31621, Spain
  • 2Saitec Offshore Technologies, Parque Empresarial Ibarrabarri, Edf. A2, 48940, Leioa-Bizkaia, Spain
  • 3University College of Cork, Dep. Environmental Research Institute-MAREI, Haulbowline Road, Ringaskiddy, P43C573, Cork, Ireland

Abstract. This paper describes the results of a wave tank test campaign of a 1/49 scaled SATH 10MW INNWIND floating platform. The Software-in-the-Loop (SiL) hybrid method was used to include the wind turbine thrust and the in-plane rotor moments My Mz. Experimental results are compared with a numerical model developed in OpenFAST of the floating wind turbine. The tank test campaign was carried out in the scaled model tested at the Deep Ocean Basin from the Lir National Ocean TF at Cork, Ireland. This floating substructure design was adapted by Saitec to support the 10MW INNWIND wind turbine within the ARCWIND project with the aim of withstanding the environmental conditions of the European Atlantic Area region. CENER provided the wind turbine controller specially designed for the SATH 10MW configuration.

A description of the experimental set up, force actuator configuration and the numeric aerodynamic parameters are provided in this work. The most relevant experimental results under wind and wave loading are showed in time series and frequency domain. The influence of the submerged geometry variations in the pitch natural frequency is discussed. The paper shows the simulation of a case with rated wind speed, where the tilted geometry for the computation of the hydrostatic and hydrodynamic properties of the submerged substructure is considered. This case provides a better agreement of the pitch natural frequency with the experiments, than a equivalent simulation using the undisplaced geometry mesh for the computation of the hydrodynamic and hydrostatic properties.

Felipe Vittori et al.

Status: open (until 09 Feb 2022)

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Felipe Vittori et al.

Felipe Vittori et al.

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Short summary
The ARCWIND project contribute to reduce the technical uncertainties of floating wind technology. The SATH floating platform from Saitec was up-scaled to support the wind turbine 10MW INNWIND. An innovative testing approach named Software-in-the-Loop (SiL) was successfully applied to integrate the wind turbine loads in the SATH scaled experiments. The OpenFAST numeric tool was calibrated and produced results in agreement with experiments about the SATH response under wind and wave loading.