Journal
OCEAN ENGINEERING
Volume 236, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2021.109441
Keywords
Floating offshore wind turbines; Dynamic analysis; Multi rotor wind turbines; Spar-buoy platform; Modelica
Funding
- Equinor Akademia Program at the University of Stavanger, Norway
Ask authors/readers for more resources
The study examines the dynamic response of a two-rotor wind turbine mounted on a spar-type floating platform, comparing it to a baseline OC3 single-rotor design. Structural design suggests a potential mass saving of approximately 26% with the two-rotor configuration. Simulations predict a significant platform yaw response for the two-rotor floating wind turbine, influenced by turbulence intensity at the hub and transversal thrust loads.
The dynamic response of a two-rotor wind turbine mounted on a spar-type floating platform is studied. The response is compared against the baseline OC3 single-rotor design. Structural design shows how the two-rotor design may lead to a mass saving of about 26% with respect to an equivalent single-rotor configuration. Simulations predict significant platform yaw response of the two-rotor floating wind turbine - about 6 deg standard deviation at the rated operating wind speed. It is shown how the platform yaw response is directly caused by the turbulence intensity at the hub coupled with the transversal distribution of thrust loads on the structure. A coupled control strategy for the rotor-collective blade pitch controller is proposed, in which a simple proportional control mitigating platform yaw motion is superimposed to the baseline OC3 PI controller. Numerical simulations show how platform yaw response is reduced by about 60%, at the cost of mean power loss at below-rated wind speeds of about 100 kW and maximum increase of the rotor-collective blade-pitch angles standard deviation of about 2 deg. Parametric analysis of mooring lines design shows how an equivalent mass density of the line of at least 190 kg/m is needed to avoid vertical loads at the anchors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available