Scale model tests for floating wind turbine concepts MARIN goes with the wind


In a pioneering development, MARIN has conducted an extensive model test campaign for floating wind turbine concepts. This represents the first time such an extensive campaign has ever taken place. Erik-Jan de Ridder, e.d.ridder@marin.nl


Floating wind turbines are considered to be the next step in the development of offshore wind energy. In 2011, MARIN performed model tests for three different floating wind turbine concepts for the DeepCwind Consortium (USA), led by the University of Maine. For these unique model tests MARIN and the DeepCwind Consortium worked closely together to develop a new, high quality wind generation machine in the MARIN testing facility.


Floating wind turbines facilitate wind energy generation in deeper areas with more wind and more space. However, selecting the most economical platform with minimised turbine motions is an important technical challenge. This is why DeepCwind chose to test a Spar, Tension Leg Platform and Semi- submersible at MARIN. The scaled-down model tests are an early part of the Maine Deepwater Offshore Wind Plan, which aims to have a commercial floating wind farm in the Gulf of Maine by the year 2030, gener- ating 5,000MW of energy.


GustoMSC Tri-Floater with MARIN stock wind turbine model and active pitch control


A key point during the model tests was that wind and waves were presented simul- taneously, allowing the study of the complex motions and loads of the rotating wind tur- bine on a moving platform in both wind and waves. To simulate the motions and loads correctly it is important that the thrust load generation by the wind turbine is simulated correctly in the basin. Due to Reynolds scale


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effects, the model tests showed that the wind turbine generated a lower thrust, and thus a lower loading on the floaters.


A new scaling method for the model scale wind turbine was developed and this will improve future model testing. This method was then used to develop a new generic


model scale wind turbine, which has been constructed at MARIN. Incorporating an active pitch control to test different control systems in the basin, this stock wind turbine is available for new projects, reducing the cost of model testing. Four new floating wind turbine projects have already taken this opportunity and tested their designs at MARIN.


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