Journal of Wind Energy (풍력에너지저널)

Korea Wind Energy Association (한국풍력에너지학회)
권호 표지

Resonance Analysis According to Initial Tower Design for Floating Offshore Wind Turbine

부유식 해상풍력발전기 타워의 초기 형상에 따른 공진 해석

  • 김준배 (울산대학교, 조선해양공학부) ;
  • 신현경 (울산대학교, 조선해양공학부)
  • Received : 2018.12.18
  • Accepted : 2018.12.27
  • Published : 2018.12.31

⟨ Previous Next ⟩

Abstract

To maximize power generation and reduce the construction cost of a commercial utility-grade wind turbine, the size of the wind turbine should be large. The initial design of the 12 MW University of Ulsan(UOU) Floating Offshore Wind Turbine(FOWT) was carried out based on the 5 MW National Renewable Energy Laboratory(NREL) offshore wind turbine model. The existing 5 MW NREL offshore wind turbines have been expanded to 12 MW UOU FOWT using the geometric law of similarity and then redesigned for each factor. The resonance of the tower is the most important dynamic responses of a wind turbine, and it should be designed by avoiding resonance due to cyclic load during turbine operations. The natural frequency of the tower needs to avoid being within the frequency range corresponding to the rotational speed of the blades, 1P, and the blade passing frequency, 3P. To avoid resonance, vibration can be reduced by modifying the stiffness or mass. The direct expansion of the 5 MW wind turbine support structure caused a resonance problem with the tower of the 12 MW FOWT and the tower length and diameter was adjusted to avoid a match of the first natural frequency and 3P excitation of the tower.

Keywords

Acknowledgement

Supported by : 한국에너지기술평가원, 한국전력공사

References

  1. SBC Energy Institute, 2016, "Wind Power" Growth onshore, hope offshore, available online: http://www.energy-transition-institute.com/Insights/Wind.html
  2. Jonkman, J., Butterfield, S., Musial, W., and Scott, G., 2009, Definition of a 5-MW Reference Wind Turbine for Offshore System Development, NREL/TP-500-38060, National Renewable Energy Laboratory.
  3. Bak, C., Zahle, F., Bitsche, R., and Kim, T., Yde, A., Henriksen, L.C., Hansen, M.H., Blasques, J.P.A.A., Gaunaa M., and Natarajan, A., 2013, Description of the DTU 10 MW Reference Wind Turbine, DTU Wind Energy Report-I-0092, Technical University of Denmark.
  4. Yun, S., Lee, K., Chung, C., and Park, H., 2012, "Analysis of Aerodynamic Tower-Rotor Interaction with the Variation of Tower Diameter for the NREL Phase VI Wind Turbine", Journal of Wind Energy, vol. 3, No.1, pp. 36-41.
  5. Kim, M., Yun, J., Lee, D., and Kim, M., 2017, "A Study on Economic Analysis of Different Type of Wind Towers", Journal of Wind Energy, vol. 8, No.1, pp. 34-42. https://doi.org/10.33519/kwea.2017.8.1.004
  6. DNV-GL, 2012, Guideline for the Certification of Offshore Wind Turbines, Edition 2012, GL Renewables Certification.
  7. Kim, J. T., 2016, A Study on Dynamic Responses of 12MW Floating Offshore Wind Turbine Using Fully Coupled Analysis, Masters', University of Ulasn
  8. Robertson, A., Jonkman, J., Masciola, M., Song, H., Goupee, A., Coulling A., and Luan C., 2014, Definition of the Semisubmersible Floating System for Phase II of OC4, NREL/TP-5000-60601, National Renewable Energy Laboratory.
  9. Burton, T., Jenkins, N., Sharpe, D., and Bossanyi E., 2011, Wind Energy Handbook, second edition, John Willey & Sons, Ltd.
  10. Kim, P. H., 2016, "Study on the Natural Frequency of Wind Turbine Tower Based on Soil Pile interaction to Evaluate Resonant Avoidance Frequency," Journal of the Korea Academia-Industrial cooperation Society, Vol. 17, No. 4 pp. 734-742.
  11. Jonkman, J.M.and Buhl, M.L. Jr., 2005, FAST User's Guide, NREL/EL-500-38230, National Renewable Energy Laboratory.
  12. Bir, G. S., 2010, User's Guide to MBC3: Multi-Blade Coordinate Transformation Code for 3-Bladed Wind Turbines, NREL/EL-500-44327, National Renewable Energy Laboratory.
  13. Nam, Y. S., 2013, Wind Turbine System Control, GS-Intervision.
  14. Thomson, W. T., 1993, Theory of Vibration with Applications, Prentice Hall.
  15. Kim, S. H., 2009, "Vibration Characteristics of the Tower Structures of Wind Turbine Generators", The Korean Society for Noise and Vibration Engineering Conference, Gangwon-do, Korea, 4/23-24, pp. 49-59.