The paper deals with the control of an oscillating water column wave energy plant, equipped with a Wells turbine driving a variable speed electric generator. The control of the plant is achieved by changing the electric torque through the power conditioning equipment. The control has to meet several requirements: rotational speed allowable range, energy quality, and allowable fluctuations in power delivered to the grid. On the other hand, the turbine is expected to perform efficiently, and so its rotational speed should approximately match the sea conditions (it should be higher in more energetic sea states). Three different control strategies are described. Results of numerical simulations are presented for two of them, and are found to satisfy the prescribed requirements.

Issue Section:
Research Papers
Topics:
Wave energy, Seas, Turbines, Computer simulation, Fluctuations (Physics), Generators, Power conditioning, Torque, Water, Wells
1.
Dixon, S. L., 1978, Fluid Mechanics, Thermodynamics of Turbomachiner, 3rd Edition, Pergamon, Oxford, U.K.
2.
Falca˜o, A. F. de O., and Justino, P. A. P., 1995, “OWC Wave Energy Converters With Valve-Constrained Air Flow,” Proceedings, Second European Wave Power Conference, Lisbon, Portugal, pp. 187–194.
3.
Falca˜o, A. F. de O., Sabino, M., Whittaker, T. J. T., and Lewis, A. W., 1995, “Design of a Shoreline Wave Power Pilot Plant for the Island of Pico, Azores,” Proceedings, Second European Wave Power Conference, Lisbon, Portugal, pp. 87–91.
4.
Gato
L. M. C.
,
Warfield
V.
, and
Thakker
A.
,
1996
, “
Performance of a High-Solidity Wells Turbine for an OWC Wave Power Plant
,”
ASME JOURNAL OF ENERGY RESOURCES TECHNOLOGY
, Vol.
118
, pp.
263
–
268
.
5.
Justino, P. A. P., and Falca˜o, A.F. de O., 1995, “Control Simulation of an OWC Wave Power Plant,” Proceedings, Second European Wave Power Conference, Lisbon, Portugal, pp. 268–272.
6.
Reghunathan
S.
,
1995
, “
The Wells Air Turbine for Wave Energy Conversion
,”
Progress in Aerospace Sciences
, Vol.
31
, pp.
335
–
386
.
7.
Sarmento
A. J. N. A.
, and
Falca˜o
A. F. de O.
,
1985
, “
Wave Generation by an Oscillating Surface-Pressure and Its Application in Wave Energy Extraction
,”
Journal of Fluid Mechanics
, Vol.
150
, pp.
467
–
485
.
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