This paper studies the dynamic characteristic of the truss Spar-type floating foundation used to support the offshore vertical-axis wind turbine (VAWT). The effects of changes in foundation structural parameters on its motions were evaluated. The results show that radius of the buoyancy tank, radius of the upper mechanical tank, interval of the center of gravity and center of buoyancy, and height of the upper mechanical tank have important effects on the heave and pitch motions of the foundation. Two sets of foundation parameters (FS-1 and FS-2) were selected to support the 5 MW Darrieus wind turbine. The motion performances of the two floating VAWTs, S-1 (the VAWT supported by FS-1) and S-2 (the VAWT supported by FS-2), were analyzed and compared. It was observed that the amplitudes of the heave and pitch motions of the floating VAWT depend on the wave loads; the mean values of the heave and pitch motions depend on the aerodynamic loads. The floating VAWT S-2 had better motion performance; its heave and pitch motions were all small. The heave frequencies of the floating VAWT were equal to the wave frequencies. For the pitch frequencies, there is a component of the rotor rotational frequency (0.175 Hz) for cases LC1 to LC4, while the amplitudes of the twice-per-revolution (2P) response are far smaller than the amplitudes of the wave response.

References

References
1.
Dominique
,
R.
, and
Christian
,
C.
,
2009
, “
Wind Float: A Floating Foundation for Offshore Wind Turbines
,”
ASME
Paper No. OMAE2009-79229.
2.
Li
,
Y.
,
2013
, “
Status of Large Scale Wind Turbine Technology Development Abroad
,”
Appl. Math. Mech.
,
34
(
10
), pp.
1003
1011
.http://www.amm.shu.edu.cn/EN/abstract/abstract15019.shtml#
3.
Henderson
,
A. R.
,
Witcher
,
D.
, and
Morgan
,
C. A.
,
2009
, “
Floating Support Structures Enabling New Markets for Offshore Wind Energy
,”
European Wind Energy Conference and Exhibition
(
EWEC
), Marseille, France, Mar. 16–19, pp.
2153
2164
.https://www.researchgate.net/publication/228523769_Floating_support_structures_enabling_new_markets_for_offshore_wind_energy
4.
Robertson
,
A. N.
, and
Jonkman
,
J. M.
,
2011
, “
Loads Analysis of Several Offshore Floating Wind Turbine Concepts
,”
International Society of Offshore and Polar Engineers Conference
, Maui, HI, June 19–24, pp.
443
450
.http://www.nrel.gov/docs/fy12osti/50539.pdf
5.
Matha
,
D.
,
Fischer
,
T.
, and
Kuhn
,
M.
,
2009
, “
Model Development and Loads Analysis of a Wind Turbine on a Floating Offshore Tension Leg Platform
,”
European Offshore Wind Conference and Exhibition
, Stockholm, Sweden, Sept.14–16, Paper No.
NREL/CP-500-46725
.http://wind.nrel.gov/public/jjonkman/floatingwindpapers/matha_fischer_kuhn_jonkman_modeldevelopmentandloadsanalysisofawindturbineonafloatingoffshoretensionlegplatform_nrel-46725_2010.pdf
6.
Duan
,
F.
,
Hu
,
Z. Q.
, and
Niedzwecki
,
J.
,
2016
, “
Model Test Investigation of a Spar Floating Wind Turbine
,”
Mar. Struct.
,
49
, pp.
76
96
.
7.
Nielsen
,
F. G.
,
Hanson
,
T. D.
, and
Kaare
,
B.
,
2006
, “
Integrated Dynamic Analysis of Floating Offshore Wind Turbines
,”
ASME
Paper No. OMAE 2006-92291.
8.
Jonkman
,
J.
, and
Buhl
,
M.
,
2007
, “
Loads Analysis of a Floating Offshore Wind Turbine Using Fully Coupled Simulation
,”
Wind Power Conference and Exhibition
, Los Angeles, CA, June 3–6, Paper No.
NREL/CP-500-41714
.http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.118.7868&rep=rep1&type=pdf
9.
Masciola
,
M.
,
Robertson
,
A.
, and
Jonkman
,
J.
,
2011
, “
Investigation of a Fast-Orcaflex Coupling Module for Integrating Turbine and Mooring Dynamics of Offshore Floating Wind Turbines
,”
International Conference on Offshore Wind Energy and Ocean Energy
, Beijing, China, Oct. 31–Nov. 2, Paper No.
NREL/CP-5000-52896
.http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=7185B34B964FB0E0A07B6EAA6A5263AD?doi=10.1.1.476.74&rep=rep1&type=pdf
10.
Willy
,
T.
,
Tjukup
,
M.
, and
Sohif
,
M.
,
2015
, “
Darrieus Vertical Axis Wind Turbine for Power Generation II: Challenges in HAWT and the Opportunity of Multi-Megawatt Darrieus VAWT Development
,”
Renewable Energy
,
75
, pp.
560
571
.
11.
Vita
,
L.
,
Friis Pedersen
,
T.
, and
Aagaard Madsen
,
H.
,
2011
, “
Offshore Vertical Axis Wind Turbine With Floating and Rotating Platform
,”
Ph.D. thesis
, Technical University of Denmark, Copenhagen, Denmark.http://orbit.dtu.dk/files/6540980/PhD_Thesis_Vita.pdf
12.
Borg
,
M.
, and
Collu
,
M.
,
2014
, “
A Comparison on the Dynamics of a Floating Vertical Axis Wind Turbine on Three Different Floating Support Structures
,”
Energy Proc.
,
53
, pp.
268
279
.
13.
Owens
,
B. C.
,
Hurtado
,
J. E.
, and
Paquette
,
J. A.
,
2013
, “
Aeroelastic Modeling of Large Off-Shore Vertical-Axis Wind Turbines: Development of the Offshore Wind Energy Simulation Toolkit
,”
AIAA
Paper No. 2013-1552.
14.
Cheng
,
Z. S.
,
Wang
,
K.
, and
Gao
,
Z.
,
2015
, “
Dynamic Response Analysis of Three Floating Wind Turbine Concepts With a Two-Bladed Darrieus Rotor
,”
J. Ocean Wind Energy
,
2
(
4
), pp.
213
222
.
15.
Collu
,
M.
,
Borg
,
M.
, and
Manuel
,
L.
,
2016
, “
On the Relative Importance of Loads Acting on a Floating Vertical Axis Wind Turbine System When Evaluating the Global System Response
,”
ASME
Paper No. OMAE2016-54628.
16.
Pan
,
Z. Y.
,
Vada
,
T.
, and
Finne
,
S.
,
2016
, “
Benchmark Study of Numerical Approaches for Wave-Current Interaction Problem of Offshore Floaters
,”
ASME
Paper No. OMAE2016-54411.
17.
Faltinsen
,
O. M.
,
1990
,
Sea Loads on Ships and Offshore Structures
,
Cambridge University Press
,
Cambridge, UK
.
18.
Roddier
,
D.
,
Peiffer
,
A.
,
Aubault
,
A.
, and
Weinstein
,
J.
,
2011
, “
A Generic 5MW Wind Float for Numerical Tool Validation and Comparison Against a Generic Spar
,”
ASME
Paper No. OMAE 2011-50278.
19.
Huang
,
L.
,
Liu
,
L. Q.
, and
Liu
,
C. Y.
,
2015
, “
The Nonlinear Bifurcation and Chaos of Coupled Heave and Pitch Motions of a Truss Spar Platform
,”
J. Ocean Univ. China
,
14
(
5
), pp.
795
802
.
20.
Liu
,
L. Q.
,
Zhou
,
B.
, and
Tang
,
Y. G.
,
2014
, “
Study on the Nonlinear Dynamical Behavior of Deepsea Spar Platform by Numerical Simulation and Model Experiment
,”
J. Vib. Control
,
20
(
10
), pp.
1528
1553
.
21.
Templin
,
R. J.
,
1974
, “
Aerodynamic Performance Theory for the NRC Vertical-Axis Wind Turbine
,” National Aero-Nautical Establishment, Ottawa, ON, Canada, Report No.
LTR-LA-160
.http://adsabs.harvard.edu/abs/1974STIN...7616618T
22.
Stricktand
,
J. H.
,
1975
, “
The Darrieus Turbine: A Performance Prediction Model Using Multiple Streamtubes
,” Sandia National Laboratories, Albuquerque, NM, Report No.
SAND74-0431
.http://windpower.sandia.gov/abstracts/750431A.pdf
23.
Paraschivoiu
,
I.
,
2002
,
Wind Turbine Design With Emphasis on Darrieus Concept
,
Presses Internationals Polytechnique
,
Montreal, QC, Canada
.
24.
Liu
,
L. Q.
,
Guo
,
Y.
,
Zhao
,
H. X.
, and
Tang
,
Y. G.
,
2017
, “
Dynamic Modeling, Simulation and Model Tests Research on the Floating Vawt
,”
Chinese J. Theo. Appl. Mech.
,
49
(2), pp.
299
307
(in Chinese).
25.
Berg
,
D.-E.
,
1983
, “
Improved Double-Multiple Stream Tube Model for the Darrieus Type Vertical-Axis Wind Turbine
,”
American Solar Energy Society Meeting
, Minneapolis, MN, June 1, pp.
231
233
.http://adsabs.harvard.edu/abs/1983ases.meet.....B
26.
API
,
2000
, “
API 2A-WSD Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-Working Stress Design
,” American Petroleum Institute, Washington, DC.
27.
Qiu
,
Y.
,
2016
, “
Research on Response of Motion of Vertical Axis Wind Turbine With Spar Floating
,” M.S. thesis, Tianjin University, Tianjin, China.
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