Model development and loads analysis of a wind turbine on a floating offshore tension leg platform

Original publisher: Golden, CO : National Renewable Energy Laboratory, [2010] OCLC Number: (OCoLC)530027914 Subject: Wind turbines -- Computer simulation -- Congresses. Excerpt: ... for the tower and over 10 % for the blades. Fatigue DELs are increased 60 % for the tower-base bending moment. The stability analysis identified a severe aerodynamic instability in the platform pitch, platform roll, and tower-and blade-bending modes for a TLP wind turbine that is idling in high winds at certain yaw misalignments with all blades fully feathered at 90º. It also identified a platform yaw instability that occurred when the TLP turbine was idling in high winds with one blade seized at 0º pitch ( and the other two blades at 90º ). The model development and analysis process described here can serve as a blueprint for future analysis of new floating-platform concepts. Various designs can be compared to each other using the described analysis process and design tools to reach conclusions on the optimal floating-platform design. The results of the loads and stability analysis can help resolve fundamental design challenges of the TLP floating system concepts. Yet, the results also indicate that further work on TLP design, controller improvements, and solving instabilities is necessary to develop economically feasible offshore floating wind turbines that can withstand the extreme conditions in the deep offshore environment. More details on this study are presented in the technical report by Matha [ 3 ]. Further information on the used hydrodynamic design tool HydroDyn is found in the report by Jonkman [ 5 ]. 5 References 1. Jonkman, J.; Butterfield, S.; Musial, W.; Scott, G. Definition of a 5-MW Reference Wind Turbine for Offshore System Development. NREL / TP-500-38060. Golden, CO: National Renewable Energy Laboratory, February 2009. 2. Tracy, C. Parametric Design of Floating Wind Turbines. M.S. Thesis. Cambridge, MA: Massachusetts Institute of Technology, 2007. 3. Matha, D. ...