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Research Papers: Ocean Renewable Energy

Study of a Floating Foundation for Wind Turbines

[+] Author and Article Information
Sébastien Gueydon

Renewable Energy Team
MARIN, Haagsteeg 2
Wageningen, The Netherlands
e-mail: s.gueydon@marin.nl

Sam Weller

Renewable Energy,
College of Engineering,
Mathematics and Physical Sciences,
University of Exeter, Cornwall Campus,
Penryn, United Kingdom
e-mail: s.weller@exeter.ac.uk

POWER magazine issue of February 1, 2012.

Recharge newspaper issue of February 16, 2011.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 16, 2012; final manuscript received April 11, 2013; published online June 6, 2013. Assoc. Editor: Krish Thiagarajan.

J. Offshore Mech. Arct. Eng 135(3), 031903 (Jun 06, 2013) (10 pages) Paper No: OMAE-12-1103; doi: 10.1115/1.4024271 History: Received November 16, 2012; Accepted April 11, 2013; Revised April 11, 2013

Offshore wind farms are currently located predominantly in shallow water as it is possible to cost effectively install bottom fixed offshore turbines. Where shallow water sites are not available, floating offshore turbines could be a better solution than bottom fixed turbines. Currently three main concepts are promoted for the design of a floating wind turbine: a ballast stabilized floater (i.e., spar), a buoyancy stabilized floater (i.e., barge or semisubmersible), or a mooring stabilized floater (tension leg platform). In April 2011 the DeepCWind consortium visited MARIN to carry out model tests in the offshore wave basin with these three types of floating wind turbine platform. This paper reports a numerical study of a wind turbine supported by a semisubmersible floater. The response of the floating system to wind and wave conditions is compared to physical measurements at 1:50 model scale. The outcome of these comparisons is discussed in the conclusions of this paper.

Copyright © 2013 by ASME
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Figures

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Fig. 1

Picture of the model test setup

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Fig. 2

Underwater geometry of the semi

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Fig. 3

Dimensions of the semi

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Fig. 4

Thrust characteristics of the rotor

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Fig. 5

Static loads in the x direction

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Fig. 6

Static loads in the y direction

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Fig. 7

Yaw moment at the tower-floater interface

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Fig. 11

Measured wave energy density spectrum for the operational condition

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Fig. 15

Tensions in the three mooring lines

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Fig. 16

Surge and pitch motions in steady wind

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Fig. 19

Heave RAOs in operational sea state

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Fig. 20

Pitch RAOs in operational sea state

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Fig. 21

Surge and pitch motions in steady wind and operational sea state

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Fig. 22

Heave RAOs in steady wind and operational sea state

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Fig. 23

Pitch RAOs in steady wind and operational sea state

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