Wind tunnel 2-DOF hybrid/HIL tests on the OC5 floating offshore wind turbine

• Published in: Volume 10: Ocean Renewable Energy
• Main Authors: Bayati, Ilmas, Belloli, Marco, Facchinetti, Alan
• Other Authors: Bayati, Ilma
• Format: Conference Object
• Language: English
• Published: American Society of Mechanical Engineers (ASME) 2017
• Subjects: Ocean Engineering; Energy Engineering and Power Technology; Mechanical Engineering; Arctic
• Online Access: http://hdl.handle.net/11311/1046648; https://doi.org/10.1115/OMAE2017-61763; http://www.asmedl.org/journals/doc/ASMEDL-home/proc/

This paper presents the numerical and experimental implementation of a 2 degrees-of-freedom (DoF) setup for simulating the surge and pitch motion of OC5 semi submersible floating offshore wind turbine, through the "hardware-in-the-loop" (HIL) approach during wind tunnel tests. This approach is hybrid since a real-time combination of computations and measurements are carried out during the experiments. This allows to separate the model tests of floating wind turbines into wave/ocean basin and wind tunnel tests, as it is currently done within the H2020/LIFES50+ project respectively at Marintek (Norway) and Politecnico di Milano (Italy), with the possibility of exploiting the advantages of each facility and overcoming the scaling issues and conflicts (e.g. Froude-Reynolds) that are emphasized when it comes to testing both wind and wave in a single test facility. In this paper the modelling approach and experimental implementation are presented, with a special focus on signals and data handling in the real-time HIL control system aimed at minimizing the effect of model/full scale discrepancies. Results are shown for free decays, regular and irregular sea states, showing promising results for the next 6-DoF system being finalized.