Ocean Systems Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Wind spectral characteristics on strength design of floating offshore wind turbines

  • Udoh, Ikpoto E. (Houston Offshore Engineering / Atkins, a member of the SNC-Lavalin Group) ;
  • Zou, Jun (Houston Offshore Engineering / Atkins, a member of the SNC-Lavalin Group)
  • Received : 2018.07.18
  • Accepted : 2018.08.12
  • Published : 2018.09.25
⟨ Previous Next ⟩

Abstract

Characteristics of a turbulence wind model control the magnitude and frequency distribution of wind loading on floating offshore wind turbines (FOWTs), and an in-depth understanding of how wind spectral characteristics affect the responses, and ultimately the design cost of system components, is in shortage in the offshore wind industry. Wind spectrum models as well as turbulence intensity curves recommended by the International Electrotechnical Commission (IEC) have characteristics derived from land-based sites, and have been widely adopted in offshore wind projects (in the absence of site-specific offshore data) without sufficient assessment of design implications. In this paper, effects of wind spectra and turbulence intensities on the strength or extreme responses of a 5 MW floating offshore wind turbine are investigated. The impact of different wind spectral parameters on the extreme blade loads, nacelle accelerations, towertop motions, towerbase loads, platform motions and accelerations, and mooring line tensions are presented and discussed. Results highlight the need to consider the appropriateness of a wind spectral model implemented in the strength design of FOWT structures.

Keywords

References

  1. Anderson, O.J. and J. LOvseth (1992), "The maritime turbulent wind field. measurements and models", Final Report for Task 4 of the Statoil Joint Industry Project, Norwegian Institute of Science and Technology, Trondheim, Norway.
  2. Anderson, O.J. and LOvseth, J. (2006), "The FrOya Database and Maritime Boundary Layer Wind Description", Mar. Struct., 19, 73-192.
  3. Bagbanci, H. (2011), "Dynamic analysis of offshore floating wind turbines", Master's Degree Dissertation, Technical University of Lisbon (Instituto Superior Tecnico, Universidade Tecnica de Lisboa), Portugal.
  4. Bir, G. (2005), "User's Guide to BMODES (Software for Computing Rotating Beam Coupled Modes)", Technical Report, National Renewable Energy Laboratory, NREL/TP-500-39133, Golden CO. USA.
  5. Det Norske Veritas (2007), Recommended Practice DNV-RP-C205, Environmental Conditions and Environmental Loads, 19-20.
  6. Elsayed, A.E. (2012), Reliability Engineering, John Wiley and Sons, Hoboken, New Jersey, USA.
  7. International Electrotechnical Commission (2005), IEC 61400-1, International Standard on Wind Turbines, Part 1: Design Requirements, Third Edition, 1301-1328.
  8. International Electrotechnical Commission (2009), IEC 61400-3 (BS EN 61400-3), International Standard on Wind Turbines, Part 3: Design Requirements for Offshore Wind Turbines.
  9. Jonkman, B.J. and Buhl, M.L., Jr. (2005), "FAST User's Guide", Technical Report, National Renewable Energy Laboratory, NREL/TP-500-38230, Golden CO. USA.
  10. Jonkman, B.J. and Kilcher, L. (2012), "Turbsim user's guide", Technical Report, National Renewable Energy Laboratory, Golden CO. USA.
  11. Jonkman, J. (2007), "Dynamic modeling and loads analysis of an offshore floating wind turbine", Technical Report, National Renewable Energy Laboratory, NREL/TP-500-41958, Golden CO. USA.
  12. Jonkman, J. Butterfield S., Musial, W. and Scott, G. (2009), "Definition of a 5-MW reference wind turbine for offshore system development", Technical Report, National Renewable Energy Laboratory, NREL/TP-500-38060, Golden CO. USA.
  13. Kaimal, J.C., Wyngaard, J.C., Haugen, D.A., Cote, O.R. and Izumi, Y. (1976), "Turbulence structure in the convective boundary layer", J. Atmop. Sciences, 33(417), 2152-2169. https://doi.org/10.1175/1520-0469(1976)033<2152:TSITCB>2.0.CO;2
  14. Kaimal, J.C., Wyngaard, J.C., Izumi, Y. and Cote, O.R. (1972), "Spectral Characteristics of Surface-layer Turbulence", J. Roy. Meteorol. Soc., 98(417), 563-589. https://doi.org/10.1002/qj.49709841707
  15. Maritime Research Institute Netherlands (2007), "Wind Loads on Offshore Structures (WINDOS), User Guide for WINDOS Engineering Tool".
  16. Masciola, M., Robertson A., Jonkman, J. and Driscoll, F. (2011), "Investigation of a FAST-OrcaFlex Coupling Module for Integrating Turbine and Mooring Dynamics of Offshore Floating Structures", National Renewable Energy Laboratory, NREL/CP-5000-52896, Golden CO. USA.
  17. Orcina Ltd., OrcaFlex User Manual, version 9.7, www.orcina.com.
  18. Tong, W. (2010), Wind Power Generation and Wind Turbine Design, WIT Press, Billerica, Massachusetts, USA.
  19. Udoh, I.E. and Zou, J. (2016), "Wind turbulence effects in global responses of a 5 MW wind turbine TLP", Proceedings of the 21ST Offshore Symposium - Texas Section of the Society of Naval Architects and Marine Engineers, Houston, USA, February.
  20. Udoh, I.E. and Zou, J. (In Preparation), "Wind Spectra Characteristics on Fatigue Design of Floating Offshore Wind Turbines".
  21. Udoh, I.E., Zou, J. and Edgar, C. (2016), "Impacts of wind turbulence on the performances of s semi-submersible type and TLP-type wind turbine", Proceedings of the Offshore Technology Conference, OTC-27261-MS, Houston, USA, May.
  22. WAMIT Inc. (2006), WAMIT User Manual, version 6.4, Massachusetts Institute of Technology and www.wamit.com.