Ocean Systems Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

The effects of blade-pitch control on the performance of semi-submersible-type floating offshore wind turbines

  • Kim, H.C. (Texas A&M University, Dept. Ocean Engineering) ;
  • Kim, M.H. (Texas A&M University, Dept. Ocean Engineering)
  • Received : 2017.12.02
  • Accepted : 2018.02.19
  • Published : 2018.03.25
⟨ Previous Next ⟩

Abstract

The effects of BPC (blade pitch control) on FOWT (floating offshore wind turbine) motions and generated power are investigated by using a fully-coupled turbine-floater-mooring simulation program. In this regard, two example FOWTs, OC4-5MW semi-submersible FOWT and KRISO four-3MW-units FOWT, are selected since the numerical simulations of those two FOWTs have been verified against experiments in authors' previous studies. Various simulations are performed changing BPC natural frequency (BPCNF), BPC damping ratio (BPCDR), and wind speeds. Through the numerical simulations, it was demonstrated that negative damping can happen for platform pitch motions and its influences are affected by BPCNF, BPCDR, and wind speeds. If BPCNF is significantly larger than platform-pitch natural frequency, the pitch resonance can be very serious due to the BPC-induced negative-damping effects, which should be avoided in the FOWT design. If wind speed is significantly higher than the rated wind velocity, the negative damping effects start to become reduced. Other important findings are also given through systematic sensitivity investigations.

Keywords

References

  1. Bae, Y.H. and Kim, M.H. (2011), "Rotor-floater-mooring coupled dynamic analysis of mono-column-TLP-type FOWT (Floating Offshore Wind Turbine)", Ocean Syst. Eng., 1(1), 95-111. https://doi.org/10.12989/ose.2011.1.1.095
  2. Bae, Y.H. and Kim, M.H. (2014), "Coupled dynamic analysis of multiple wind turbines on a large single floater", Ocean Eng., 92, 175-187. https://doi.org/10.1016/j.oceaneng.2014.10.001
  3. Hansen, M., Hansen, A., Larsen, T., Oye, S., Sorensen, P. and Fuglsang, P. (2005), Control Design for a Pitch-Regulated. Variable Speed Wind Turbine.
  4. Jonkman, J. (2008), "Influence of control on the pitch damping of a floating wind turbine", Paper presented at the 46th AIAA Aerospace Sciences Meeting and Exhibit.
  5. Jonkman, J. (2010), Definition of the Floating System for Phase IV of OC3. Retrieved from
  6. Jonkman, J. M. and Buhl Jr, M. L. (2005). Fast user's guide-updated august 2005. Retrieved from
  7. Jonkman, J., Butterfield, S., Musial, W. and Scott, G. (2009), Definition of a 5-MW reference wind turbine for offshore system development, Retrieved from
  8. Kim, H.C. and Kim, M.H. (2015), "Global performances of a semi-submersible 5 MW wind-turbine including second-order wave-diffraction effects", Ocean Syst. Eng., 5(3), 139-160. https://doi.org/10.12989/ose.2015.5.3.139
  9. Kim, H.C. and Kim, M.H. (2016), "Comparison of simulated platform dynamics in steady/dynamic winds and irregular waves for OC4 semi-submersible 5MW wind-turbine against DeepCwind model-test results", Ocean Syst. Eng., 6(1), 1-21. https://doi.org/10.12989/ose.2016.6.1.001
  10. Kim, H.C., Kim, K.H., Kim, M.H. and Hong, K. (2017), "Global performance of a KRISO semisubmersible multiunit floating offshore wind turbine: Numerical simulation vs. model test", Int. J. Offshore Polar Eng., 27(1), 70-81. https://doi.org/10.17736/ijope.2017.fvr02
  11. Kim, M.H. and Yue, D.K. (1989), "The complete second-order diffraction solution for an axisymmetric body Part 1. Monochromatic incident waves", J. Fluid Mech., 200, 235-264. https://doi.org/10.1017/S0022112089000649
  12. Kim, M.H. and Yue, D.K. (1990), "The complete second-order diffraction solution for an axisymmetric body Part 2. Bichromatic incident waves and body motions", J. Fluid Mech., 211, 557-593. https://doi.org/10.1017/S0022112090001690
  13. Kim, M.H. and Yue, D.K. (1991), Sum and difference-frequency wave loads on a body in unidirectional Gaussian seas.
  14. Kim, M.H., Ran, Z. and Zheng, W. (2001), "Hull/mooring coupled dynamic analysis of a truss spar in time domain", Int. J. Offshore Polar Eng., 11(1).
  15. Larsen, T.J. and Hanson, T.D. (2007), "A method to avoid negative damped low frequent tower vibrations for a floating, pitch controlled wind turbine", Paper presented at the Journal of Physics: Conference Series.
  16. Namik, H. and Stol, K. (2011), "Performance analysis of individual blade pitch control of offshore wind turbines on two floating platforms", Mechatronics, 21(4), 691-703. https://doi.org/10.1016/j.mechatronics.2010.12.003
  17. Tahar, A. and Kim, M.H. (2003), "Hull/mooring/riser coupled dynamic analysis and sensitivity study of a tanker-based FPSO", Appl. Ocean Res., 25(6), 367-382. https://doi.org/10.1016/j.apor.2003.02.001
  18. Yang, C.K. and Kim, M.H. (2010), "Transient effects of tendon disconnection of a TLP by hull-tendon-riser coupled dynamic analysis", Ocean Eng., 37(8-9), 667-677. https://doi.org/10.1016/j.oceaneng.2010.01.005
  19. Yang, C.K. and Kim, M.H. (2011), "The structural safety assessment of a tie-down system on a tension leg platform during hurricane events", Ocean Syst. Eng., 1(4), 263-283. https://doi.org/10.12989/ose.2011.1.4.263