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Research Papers: Ocean Renewable Energy

Numerical Modeling and Analysis of a Hybrid-Spar Floating Wind Turbine

[+] Author and Article Information
Tomoaki Utsunomiya

Department of Marine Systems Engineering,
Kyushu University,
744 Motooka, Nishi-ku,
Fukuoka 819-0395, Japan
e-mail: utsunomiya@nams.kyushu-u.ac.jp

Iku Sato

Toda Corporation,
Kyobashi 1-7-1, Chuo-ku,
Tokyo 104-8388, Japan
e-mail: iku.sato@toda.co.jp

Osamu Kobayashi

Toda Corporation,
Kyobashi 1-7-1, Chuo-ku,
Tokyo 104-8388, Japan
e-mail osamu.kobayashi@toda.co.jp

Takashi Shiraishi

Power System Business Unit,
Hitachi, Ltd.,
Kokubu-cho 1-1-1,
Hitachi 316-8501, Ibaraki, Japan
e-mail takashi.shiraishi.kx@hitachi.com

Takashi Harada

Power System Business Unit,
Hitachi, Ltd.,
Sotokanda 1-18-13, Chiyoda-ku,
Tokyo 101-8608, Japan
e-mail takashi.harada.np@hitachi.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 25, 2017; final manuscript received September 2, 2018; published online January 17, 2019. Assoc. Editor: Carlos Guedes Soares.

J. Offshore Mech. Arct. Eng 141(3), 031903 (Jan 17, 2019) (5 pages) Paper No: OMAE-17-1221; doi: 10.1115/1.4041994 History: Received December 25, 2017; Revised September 02, 2018

In this paper, numerical modeling and analysis of a hybrid-spar floating wind turbine is presented. The hybrid-spar consists of steel at the upper part and precast prestressed concrete at the lower part. Such a configuration is referred to as a hybrid-spar in this paper. The hybrid spar was successfully installed offshore of Kabashima island, Goto city, Nagasaki prefecture, Japan, on Oct. 18, 2013 (see Utsunomiya et al., 2015, “Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform,” ASME Paper No. OMAE2015-41544 for details). In this paper, some details on numerical modeling of the hybrid-spar for design load analysis are presented. Then, the validation of the numerical analysis model is presented for a full-scale hybrid-spar model with 2-MW wind turbine. The comparison has been made for the natural periods and the response during rated power production test. Basically, both comparisons have shown good agreement between the measured values and the simulation, showing reliability of the developed code and the numerical model.

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References

Matsukuma, H. , and Utsunomiya, T. , 2008, “Motion Analysis of a Floating Offshore Wind Turbine Considering Rotor-Rotation,” IES J. Part A: Civ. Struct. Eng., 1(4), pp. 268–279. [CrossRef]
Utsunomiya, T. , Yoshida, S. , Ookubo, H. , Sato, I. , and Ishida, S. , 2012, “Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions,” ASME Paper No. OMAE2012-83985.
Utsunomiya, T. , Yoshida, S. , Ookubo, H. , Sato, I. , and Ishida, S. , 2014, “Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions,” ASME J. Offshore Mech. Arct. Eng., 136(2), p. 020904. [CrossRef]
Utsunomiya, T. , Sato, I. , Yoshida, S. , Ookubo, H. , and Ishida, S. , 2013, “Dynamic Response Analysis of a Floating Offshore Wind Turbine During Severe Typhoon Event,” ASME Paper No. OMAE2013-10618.
Ishida, S. , Kokubun, K. , Nimura, T. , Utsunomiya, T. , Sato, I. , and Yoshida, S. , 2013, “At-Sea Experiment of a Hybrid Spar Type Offshore Wind Turbine,” ASME Paper No. OMAE2013-10655.
Utsunomiya, T. , Yoshida, S. , Kiyoki, S. , Sato, I. , and Ishida, S. , 2014, “Dynamic Response of a Spar-Type Floating Wind Turbine at Power Generation,” ASME Paper No. OMAE2014-24693.
Utsunomiya, T. , Sato, I. , Kobayashi, O. , Shiraishi, T. , and Harada, T. , 2015, “Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform,” ASME Paper No. OMAE2015-41544.
Skaare, B. , Nielsen, F. G. , Hanson, T. D. , Yttervik, R. , Havmoeller, O. , and Rekdal, A. , 2015, “Analysis of Measurements and Simulations From the Hywind Demo Floating Wind Turbine,” Wind Energy, 18(6), pp. 1105–1122. [CrossRef]
Gao, Z. , Bingham, H. B. , Ingram, D. , Kolios, A. , Karmakar, D. , Utsunomiya, T. , Catipovic, I. , Colicchio, G. , Rodrigues, J. M. , Adam, F. , Karr, D. G. , Fang, C. , Shin, H.-K. , Slaette, J. , Ji, C. , Sheng, W. , Liu, P. , and Stoev, L. , 2018, “Offshore Renewable Energy,” 20th International Ship and Offshore Structures Congress (ISSC 2018): Specialist Committee Reports, Amsterdam, The Netherlands, Sept. 9–14, pp. 193–277.
Jonkman, J. , and Buhl, M. L., Jr. , 2005, “FAST User's Guide,” National Renewable Energy Laboratory, Golden, CO, Report No. NREL/EL-500-38230.
Laino, D. J. , and Hansen, A. C. , 2002, “AeroDyn User's Guide, Version 12.50,” National Renewable Energy Laboratory, Golden, CO.
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IEC, 2010, “Wind Turbines—Part 1: Design Requirements,” International Electrotechnical Commission, Geneva, Switzerland, Standard No. IEC61400-1. https://www.saiglobal.com/pdftemp/previews/osh/iec/iec61000/61400/iec61400-1%7Bed3.0%7Den.pdf
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Figures

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Fig. 1

Aero-hydro-servo-mooring dynamics integrated dynamic analysis tool

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Fig. 2

Hydrodynamic forces acting on platform element

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Fig. 3

Main dimensions of the full-scale model

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Fig. 4

Dynamic analysis model

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Fig. 5

Two megawatt hybrid-spar model at Kabashima island, Nagasaki prefecture, Japan

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Fig. 6

Wind speed and turbulence intensity (TI) measured at hub-height during the rated power production test

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Fig. 7

Power curve: comparison between the measured values and the simulation

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Fig. 8

Mean value of the pitch response: comparison between the measured values and simulation

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Fig. 9

Standard deviation of the pitch response: comparison between the measured values and simulation

Tables

Errata

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