During the past decade, the demand for clean renewable energy continues to rise
drastically in Europe, the US, and other countries. Wind energy in the ocean can possibly
be one of those future renewable clean energy sources as long it is economically feasible
and technologically manageable. So far, most of the offshore wind farm research has
been limited to fixed platforms in shallow-water areas. In the water depth deeper than
30m, however, floating-type wind farms tend to be more feasible. Then, the overall
design and engineering becomes more complicated than fixed platforms including the
coupled dynamics of platforms, mooring lines, and blades. In the present study, a
numerical time-domain model has been developed for the fully coupled dynamic
analysis of an offshore floating wind turbine system including blade-rotor dynamics and
platform motions. As a test case, the TLP-type floater system with 3 blades of 70-m
diameter designed by the National Renewable Energy Laboratory (NREL) is selected to
analyze the dynamic coupling effects among floating system, mooring lines, and wind
turbine. The performance of the selected system in a typical wind-wave-current
condition has been simulated and analyzed. A similar study for the floater and rotor
coupled dynamic analysis was conducted by MIT and NREL. However, in the present case, the dynamic coupling between platform and mooring lines are also considered in
addition to the rotor-floater dynamic coupling. It is seen that the rotor-floater coupling
effects increase with wind velocity and blade size. The increased coupling effects tend to
increase the dynamic tension of TLP tethers. The developed technology and numerical
tool are applicable to the new offshore floating wind farms planned in the future.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2564 |
| Date | 15 May 2009 |
| Creators | Shim, Sangyun |
| Contributors | Kim, M. H |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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