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TECHNICAL PAPERS

Optimizing the Power Take Off of a Wave Energy Converter With Regard to the Wave Climate

[+] Author and Article Information
Gaelle Duclos, Aurelien Babarit

 Laboratoire de Mécanique des Fluides (CNRS-UMR6598), Ecole Centrale de Nantes, 1, Rue de la Noë, 44300 Nantes, France

Alain H. Clément

 Laboratoire de Mécanique des Fluides (CNRS-UMR6598), Ecole Centrale de Nantes, 1, Rue de la Noë, 44300 Nantes, FranceAlain.Clement@ec-nantes.fr

J. Offshore Mech. Arct. Eng 128(1), 56-64 (Jul 30, 2005) (9 pages) doi:10.1115/1.2163877 History: Received March 15, 2005; Revised July 30, 2005

Considered as a source of renewable energy, wave is a resource featuring high variability at all time scales. Furthermore wave climate also changes significantly from place to place. Wave energy converters are very often tuned to suit the more frequent significant wave period at the project site. In this paper we show that optimizing the device necessitates accounting for all possible wave conditions weighted by their annual occurrence frequency, as generally given by the classical wave climate scatter diagrams. A generic and very simple wave energy converter is considered here. It is shown how the optimal parameters can be different considering whether all wave conditions are accounted for or not, whether the device is controlled or not, whether the productive motion is limited or not. We also show how they depend on the area where the device is to be deployed, by applying the same method to three sites with very different wave climate.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

The generic device: working principle

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Figure 2

Sea state occurrence frequency for the Yeu Island

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Figure 3

Sea state occurrence frequency for point 67

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Figure 4

Sea state occurrence frequency at St. Pierre

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Figure 5

Capture width ratio versus Ts, varying T0, with B=Ca(ω0) (uncontrolled device)

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Figure 6

Capture width ratio versus Ts, varying T0, with B=Ca(ω0) (controlled device)

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Figure 7

Heave motion amplitude versus Ts, varying T0, with B=Ca(ω0) (uncontrolled device)

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Figure 8

Heave motion amplitude versus Ts, varying T0, with B=Ca(ω0) (controlled device)

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Figure 9

Capture width ratio versus Ts, varying B, with T0=9s (uncontrolled device)

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Figure 10

Capture width ratio versus Ts, varying B, with T0=9s (controlled device)

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Figure 11

Influence of B and T0 on annual energy production (uncontrolled device), Ts=8s, Hs=1m

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Figure 12

Influence of B and T0 on annual energy production (controlled device), Ts=8s, Hs=1m

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Figure 13

Influence of B and T0 on annual energy production (uncontrolled device), Ts=8s, Hs=2.5m

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Figure 14

Influence of B and T0 on annual energy production (controlled device), Ts=8s, Hs=2.5m

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Figure 15

Influence of B and T0 on annual energy production (uncontrolled device), Ts=10s, Hs=2m

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Figure 16

Influence of B and T0 on annual energy production (controlled device), Ts=10s, Hs=2m

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Figure 17

Influence of B and T0 on annual energy production (uncontrolled device), Ts=9s, Hs=1.5m

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Figure 18

Influence of B and T0 on annual energy production (controlled device), Ts=9s, Hs=1.5m

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Figure 19

Influence of B and T0 on annual energy production at Yeu Island (uncontrolled device)

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Figure 20

Influence of B and T0 on annual energy production at Yeu Island (controlled device)

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Figure 21

Influence of B and T0 on annual energy production at P67 (uncontrolled device)

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Figure 22

Influence of B and T0 on annual energy production at P67 (controlled device)

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Figure 23

Influence of B and T0 on annual energy production at St. Pierre (uncontrolled device)

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Figure 24

Influence of B and T0 on annual energy production at St. Pierre (controlled device)

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Figure 25

St. Pierre site: top row (a,b) uncontrolled device; bottom row; (c,d) controlled device; left column (a,c) prevailing sea state optimization; right column (b,d) global optimization

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Figure 26

P67 site: top row (a,b) uncontrolled device; bottom row (c,d) controlled device; left column (a,c) prevailing sea state optimization; right column (b,d) global optimization

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