Ocean Systems Engineering

  • 제8권1호
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  • Pages.79-99
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  • 2018
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  • 2093-6702(pISSN)
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  • 2093-677X(eISSN)
테크노프레스 (Techno-Press)
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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)
  • 투고 : 2017.12.02
  • 심사 : 2018.02.19
  • 발행 : 2018.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

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  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
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