This paper presents a mathematical model of an innovative offshore wind turbine with fluid power transmission. The proposed concept is a variable-speed, pitch controlled turbine which differs from conventional technology by using fluid power technology as a medium to transfer the energy from the wind. The final aim is to use several turbines to centralize electricity generation. Unlike conventional variable speed concepts, the proposed turbine comprises a passive-torque control method which allows the turbine to operate at optimal aerodynamic performance for different wind speeds. A numerical model of a single turbine is developed and time-domain simulations are used to analyze the dynamic response of the different operational parameters to a turbulent wind speed input. The results are compared with those of a reference offshore wind turbine with similar characteristics. It is shown that operation below rated wind speed with a passive control is possible for a single turbine with a better dynamic performance than the reference in terms of transmission torque. However, the efficiency of the energy transmission is reduced throughout the operational range. The addition and simulation of more turbines to the hydraulic network is necessary to determine to which extent the benefits of a centralized wind farm compensate for the relatively lower efficiency.

References

References
1.
Spinato
,
F.
,
Tavner
,
P.
,
Bussel
,
G. V.
, and
Koutoulakos
,
E.
,
2009
, “
Reliability of Wind Turbine Subassemblies
,”
IET Renewable Power Gener.
,
3
(
4
), pp.
387
401
.10.1049/iet-rpg.2008.0060
2.
Liserre
,
M.
,
Cardenas
,
R.
,
Molinas
,
M.
, and
Rodriguez
,
J.
,
2011
, “
Overview of Multi-MW Wind Turbines and Wind Parks
,”
IEEE Trans. Ind. Electron.
,
58
(
4
), pp.
1081
1095
.10.1109/TIE.2010.2103910
3.
Parker
,
M.
, and
Anaya-Lara
,
O.
,
2013
, “
Cost and Losses Associated With Offshore Wind Farm Collection Networks Which Centralise the Turbine Power Electronic Converters
,”
IET Renewable Power Gener.
,
7
(
4
), pp.
390
400
.10.1049/iet-rpg.2012.0262
4.
Diepeveen
,
N.
,
2013
, “
On Fluid Power Transmission for Offshore Wind Turbines
,” Ph.D. thesis, Technical University of Delft, Delft, The Netherlands.
5.
Jonkman
,
J.
,
Butterfield
,
S.
,
Musial
,
W.
, and
Scott
,
G.
,
2009
, “
Definition of a 5 MW Reference Wind Turbine for Offshore System Development
,” National Renewable Energy Laboratory, Golden, CO, Technical Report No. NREL/TP-500-38060.
6.
Larsen
,
T.
, and
Hansen
,
A.
,
2007
, “
How to HAWC2, the Users Manual
,” Risoe National Laboratory, Technical University of Denmark, Denmark, Technical Report No. Riso-R-1597(en).
7.
Bossanyi
,
E.
,
2010
, “
Bladed User Manual
,” Garrad Hassan and Partners Ltd., Bristol, UK.
8.
Jarquin-Laguna
,
A.
, and
Diepeveen
,
N.
,
2013
, “
Dynamic Analysis of Fluid Power Drive-Trains for Variable Speed Wind Turbines: A Parameter Study
,”
Scientific Proceedings of the European Academy of Wind Energy
, EWEA 2013, pp.
11
16
.
9.
Chen
,
Z.
,
Guerrero
,
J.
, and
Blaabjerg
,
F.
,
2009
, “
A Review of the State of the Art of Power Electronics for Wind Turbines
,”
IEEE Trans. Power Electron.
,
24
(
8
), pp.
1859
1875
.10.1109/TPEL.2009.2017082
10.
Angehm
,
R.
,
2000
, “
Safety Engineering for the 423 MW-Pelton Runners at Bieudron
,”
20th IAHR Symposium
, VATECH HYDRO.
11.
Whittaker
,
T.
, and
Folley
,
M.
,
2012
, “
Nearshore Oscillating Wave Surge Converters and the Development of Oyster
,”
Philos. Trans. R. Soc., A
,
370
(
1959
), pp.
345
364
.10.1098/rsta.2011.0152
12.
Bianchi
,
F.
,
Battista
,
H.
, and
Mantz
,
R.
,
1997
,
Wind Turbine Control Systems: Principles, Modelling and Gain Scheduling Design (Advances in Industrial Control)
,
1st ed.
, Vol.
1
,
A.
Editor
, ed.,
Springer
,
London
, pp.
1
3
.
13.
Merrit
,
H.
,
1967
,
Hydraulic Control Systems
,
Wiley
, New York.
14.
Makinen
,
J.
,
Piche
,
R.
, and
Ellman
,
A.
,
2000
, “
Fluid Transmission Line Modeling Using a Variational Method
,”
ASME J. Dyn. Syst., Meas., Control
,
122
(
1
), pp.
153
162
.10.1115/1.482449
15.
Yang
,
W.
, and
Tobler
,
W.
,
1991
, “
Dissipative Modal Approximation of Fluid Transmission Lines Using Linear Friction Model
,”
ASME J. Dyn. Syst., Meas., Control
,
113
(
1
), pp.
152
162
.10.1115/1.2896342
16.
Makinen
,
J.
,
Pertola
,
P.
, and
Marjamaki
,
H.
,
2010
, “
Modeling Coupled Hydraulic-Driven Multibody Systems Using Finite Element Method
,”
1st Joint International Conference on Multibody System Dynamics
, Lappeenranta University of Technology.
17.
Thake
,
J.
,
2000
,
The Micro-hydro Pelton Turbine Manual
,
ITDG Publishing
, London.
18.
Zhang
,
Z.
,
2007
, “
Flow Interactions in Pelton Turbines and the Hydraulic Efficiency of the Turbine System
,”
Proc. Inst. Mech. Eng., Part A
,
221
(
3
), pp.
343
357
.10.1243/09576509JPE294
19.
Diepeveen
,
N.
, and
Jarquin-Laguna
,
A.
,
2012
, “
Wind Tunnel Experiments to Prove a Hydraulic Passive Torque Control Concept for Variable Speed Wind Turbines
,” Science of Making Torque from Wind, The European Academy of Wind Energy, EAWE 2012.
20.
Grunnet
,
J.
,
Soltani
,
M.
,
Knudsen
,
T.
,
Kragelund
,
M.
, and
Bak
,
T.
,
2010
, “
Aeolus Toolbox for Dynamics Wind Farm Model, Simulation and Control
,”
European Wind Energy Conference and Exhibition
, The European Academy of Wind Energy, EWEC 2010, pp.
3119
3129
.
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