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.

References

References
1.
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
.
2.
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.
3.
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
.
4.
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.
5.
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.
6.
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.
7.
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.
8.
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
.
9.
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
.
10.
Jonkman
,
J.
, and
Buhl
,
M. L.
, Jr.
,
2005
, “
FAST User's Guide
,” National Renewable Energy Laboratory, Golden, CO, Report No. NREL/EL-500-38230.
11.
Laino
,
D. J.
, and
Hansen
,
A. C.
,
2002
, “
AeroDyn User's Guide, Version 12.50
,” National Renewable Energy Laboratory, Golden, CO.
12.
Moriarty
,
P. J.
, and
Hansen
,
A. C.
,
2005
, “
AeroDyn Theory Manual
,” Technical Report, National Renewable Energy Laboratory, Golden, CO, Report No.
NREL/EL-500-36881
.https://www.nrel.gov/docs/fy05osti/36881.pdf
13.
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
14.
Nielsen
,
F. G.
,
Hanson
,
T. D.
, and
Skaare
,
B.
,
2006
, “
Integrated Dynamic Analysis of Floating Offshore Wind Turbines
,”
ASME
Paper No. OMAE2006-92291.
You do not currently have access to this content.