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Current Status of Phase VI Floating Design

Current Status of Phase VI Floating Design. IEA Wind Task 30 Kick-Off Meeting June 8, 2010 Jason Jonkman, Ph.D. Senior Engineer, NREL. Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC.

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Current Status of Phase VI Floating Design

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  1. Current Status ofPhase VI Floating Design IEA Wind Task 30Kick-Off Meeting June 8, 2010 Jason Jonkman, Ph.D. Senior Engineer, NREL Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC

  2. Phase VI Floater Concept • TLP & semi-submersible were both suggested candidates for Phase VI • More interest in semi-submersible b/c: • Greater system motions & couplings • Importance of hydrodynamic radiation & diffraction • Catenary moorings • Principle Power Inc. (PPI) has kindly agreed to design a semi-submersible, based on the WindFloat, & make it available to Task 30 participants Spar Concept by SWAY

  3. WindFloat Key Design Features • WindFloat by PPI, USA • Designed to support existing WTs: • Modifications only to tower & controller • Pitch & roll restoring through waterplane area & fixed water ballast • Tower mounted on one column • Active ballast system maintains zero-mean pitch angle • Heave plates improve natural response periods & damping Spar Concept by SWAY WindFloat (Image: D. Roddier, PPI)

  4. Original Design Plan by PPI • Tower would be moved to center: • Simplify system’s asymmetry • Avoid issues associated with shift in origin • Heave plates would be eliminated by compensating with larger columns: • Heave plates require empirically derived drag • Heave plate IP protected by PPI • However, design iteration revealed: • Tower in center requires a lot of extra support structure • Columns would have to be unreasonably large to achieve desired response periods Spar Concept by SWAY Semi-Submersible Concept (Image: D. Roddier, PPI)

  5. Current Design Plan by PPI • Keep tower on one column • Keep heave plates: • PPI will supply suitable drag properties • Platform will support NREL 5-MW WT • Aiming for response periods similar to that of OC3-Hywind spar buoy • Scaled system will be tested in a wave tank within DeepCWind project: • Data will become available for model validation • Design status: • Design iteration in progress • Developing specifications report • Expected completion in Summer, 2010 Semi-Submersible Concept (Image: D. Roddier, PPI) Spar Concept by SWAY

  6. Preliminary Design Details Spar Concept by SWAY

  7. Thank You for Your Attention Jason Jonkman, Ph.D. +1 (303) 384 – 7026 jason.jonkman@nrel.gov Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by the Alliance for Sustainable Energy, LLC

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