This paper presents the experimental proof of concept of CECO, an innovative wave energy converter designed to convert simultaneously the kinetic and the potential energy of ocean waves into electrical energy, based on the oblique motion of two floating modules. First, the main characteristics of CECO and its work principle are briefly presented. Then, the behavior of the device is analyzed for different wave conditions and modes of operation (power take-off damping levels and device inclinations), based on results obtained with a physical model built on a geometric scale of 1/20. CECO performance strongly depends on the incident wave characteristics, the device inclination angle, and the damping introduced by the power-take-off. Relative capture widths of up to 14% were reached in this initial study, confirming that CECO is a valid technology to extract energy from waves. The application of wavelets showed that CECO response occurs mainly in the frequency of incident waves during the entire test duration.

1.
Bozzi
,
S.
,
Miquel
,
A. M.
,
Antonini
,
A.
,
Passoni
,
G.
, and
Archetti
,
R.
, “
Modeling of a point absorber for energy conversion in Italian seas
,”
Energies
6
,
3033
3051
(
2013
).
2.
Carballo
,
R.
,
Sánchez
,
M.
,
Ramos
,
V.
,
Fraguela
,
J. A.
, and
Iglesias
,
G.
, “
Intra-annual wave resource characterization for energy exploitation: A new decision-aid tool
,”
Energy Convers. Manage.
93
,
1
8
(
2015
).
3.
Chaplin
,
R. V.
, “
Seaweaver: A new surge-resonant wave energy converter
,”
Renewable Energy
57
,
662
670
(
2013
).
4.
Drew
,
B.
,
Plummer
,
A. R.
, and
Sahinkaya
,
M. N.
, “
A review of wave energy converter technology
,”
Proc. IMechE
223
,
887
(
2009
).
5.
Duclos
,
G.
,
Babarit
,
A.
, and
Clément
,
A. H.
, “
Optimizing the power take off of a wave energy converter with regard to the wave climate
,”
ASME. J. Offshore Mech. Arct. Eng.
128
(
1
),
56
64
(
2005
).
6.
Eriksson
,
M.
,
Waters
,
R.
,
Svensson
,
O.
,
Isberg
,
J.
, and
Leijon
,
M.
, “
Wave power absorption: Experiments in open sea and simulation
,”
J. Appl. Phys.
102
,
084910
(
2007
).
7.
Falcão
,
A. F. de O.
, “
Wave energy utilization: A review of the technologies
,”
Renewable Sustainable Energy Rev.
14
(
3
),
899
918
(
2010
).
8.
Falnes
,
J.
, “
A review of wave-energy extraction
,”
Mar. Struct.
20
(
4
),
185
201
(
2007
).
9.
Göteman
,
M.
,
Engström
,
J.
,
Eriksson
,
M.
,
Isberg
,
J.
, and
Leijon
,
M.
, “
Methods of reducing power fluctuations in wave energy parks
,”
J. Renewable Sustainable Energy
6
,
043103
(
2014
).
10.
Gunn
,
K.
and
Stock-Williams
,
C.
, “
Quantifying the global wave power resource
,”
Renewable Energy
44
,
296
304
(
2012
).
11.
Hemer
,
M. A.
and
Griffin
,
D. A.
, “
The wave energy resource along Australia's Southern margin
,”
J. Renewable Sustainable Energy
2
,
043108
(
2010
).
12.
Holmes
,
B.
and
Nielsen
,
K.
, “
Task 2.1 guidelines for the development & testing of wave energy systems
,” OES IA Document No. T02-2.1,
2010
.
13.
Iglesias
,
G.
,
López
,
M.
,
Carballo
,
R.
,
Castro
,
A.
,
Fraguela
,
J. A.
, and
Frigaard
,
P.
, “
Wave energy potential in Galicia (NW Spain)
,”
Renewable Energy
34
(
11
),
2323
2333
(
2009
).
14.
López
,
M.
,
Veigas
,
M.
, and
Iglesias
,
G.
, “
On the wave energy resource of Peru
,”
Energy Convers. Manage.
90
,
34
40
(
2015
).
15.
MacNicoll
,
M. T.
,
Thiagarajan
,
K. P.
, and
Rohrer
,
J.
, “
Modeling of the efficiency of a semisubmerged ocean wave energy converter
,”
Mar. Technol. Soc. J.
47
(
4
),
177
186
(
2013
).
16.
Marinheiro
,
J.
,
Rosa-Santos
,
P.
,
Taveira-Pinto
,
F.
, and
Ribeiro
,
J.
, “
Feasibility study of the CECO wave energy converter
,” in
Maritime Technology and Engineering
, edited by
C.
Guedes Soares
and
T. A.
Santos
(
CRC Press
,
2015
), pp.
1259
1267
, ISBN: 978-1-138-02727-5.
17.
Payne
,
G.
,
Guidance for the Experimental Tank Testing of Wave Energy Converters
(
The University of Edinburgh, SuperGen UK Center for Marine Energy Research
,
2008
).
18.
Perez
,
C.
,
Greaves
,
D.
, and
Iglesias
,
G.
, “
A review of combined wave and offshore wind energy
,”
Renewable Sustainable Energy Rev.
42
,
141
153
(
2015
).
19.
Richardson
,
D. S.
and
Aggidis
,
G. A.
, “
The economics of multi-axis point absorber wave energy converters
,” in
Proceedings of the 32nd International Conference on Ocean, Offshore and Arctic Engineering, Ocean Renewable Energy
(ASME,
2013
), Vol.
8
.
20.
Rosa-Santos
,
P.
,
Taveira-Pinto
,
F.
, and
Veloso-Gomes
,
F.
, “
Experimental evaluation of the tension mooring effect on the response of moored ships
,”
Coastal Eng. (Elsevier)
85
,
60
71
(
2014a
).
21.
Rosa-Santos
,
P.
,
Taveira-Pinto
,
F.
,
Marinheiro
,
J.
, and
Ribeiro
J.
, “
Performance evaluation of an optimized wave energy converter
,” in
5th International Conference on the Application of Physical Modelling to Port & Coastal Protection—Coastlab14
, edited by
V.
Penchev
and
F.
Taveira Pinto
(
2014b
), Vol.
2
, pp.
326
335
.
22.
Rosa-Santos
,
P.
,
Taveira-Pinto
,
F.
,
Pinho-Ribeiro
,
J.
,
Teixeira
,
L.
, and
Marinheiro
,
J.
, “
Harnessing the kinetic and potential wave energy: Design and development of a new wave energy converter
,” in
Renewable Energies Offshore
, edited by
C.
Guedes Soares
(
CRC Press
,
2015
), pp.
367
374
.
23.
Rusu
,
E.
and
Guedes Soares
,
C.
, “
Numerical modelling to estimate the spatial distribution of the wave energy in the Portuguese nearshore
,”
Renewable Energy
34
(
6
),
1501
1516
(
2009
).
24.
Truong
,
D. Q.
and
Ahn
,
K. K.
, “
Development of a novel point absorber in heave for wave energy conversion
,”
Renewable Energy
65
,
183
191
(
2014
).
25.
Valério
,
D.
,
Beirão
,
P.
, and
Costa
,
J. S.
, “
Optimisation of wave energy extraction with the Archimedes wave swing
,”
Ocean Eng.
34
(
17–18
),
2330
2344
(
2007
).
26.
Veigas
,
M.
,
López
,
M.
, and
Iglesias
,
G.
, “
Assessing the optimal location for a shoreline wave energy converter
,”
Appl. Energy
132
(
1
),
404
411
(
2014
).
27.
Vicinanza
,
D.
,
Margheritini
,
L.
,
Kofoed
,
J. P.
, and
Buccino
,
M.
, “
The SSG wave energy converter: performance, status and recent developments
,”
Energies
5
,
193
226
(
2012
).
28.
Zheng
,
C. W.
,
Zhou
,
L.
,
Jia
,
B. K.
,
Pan
,
J.
, and
Li
,
X.
, “
Wave characteristic analysis and wave energy resource evaluation in the China Sea
,”
J. Renewable Sustainable Energy
6
,
043101
(
2014
).
29.
Zurkinden
,
A. S.
,
Ferri
,
F.
,
Beatty
,
S.
,
Kofoed
,
J. P.
, and
Kramer
,
M. M.
, “
Non-linear numerical modeling and experimental testing of a point absorber wave energy converter
,”
Ocean Eng.
78
(
1
),
11
21
(
2014
).
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