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Testing and control of a power take-off system for an oscillating-water-column wave energy converter

Author

Listed:
  • Henriques, J.C.C.
  • Gomes, R.P.F.
  • Gato, L.M.C.
  • Falcão, A.F.O.
  • Robles, E.
  • Ceballos, S.

Abstract

The paper concerns the development of the PTO (power take-off) control of an OWC (oscillating-water-column) spar-buoy wave energy converter. The OWC spar-buoy is an axisymmetric device consisting of a submerged vertical tail tube open at both ends, rigidly fixed to a floater that moves essentially in heave. The oscillating motion of the internal free surface relative to the floater-tube set, produced by the incident waves, makes the air flow through a novel self-rectifying air turbine: the biradial turbine. To reduce the losses of the PTO system at partial load, an electrical generator with a rated power twice the maximum expected average power conversion of the buoy was adopted. The control of the turbine-generator set under highly energetic sea-state conditions was experimentally investigated by means of tests performed in a PTO test rig. In the reported tests, the hydrodynamics of the OWC spar-buoy and the aerodynamics of the air turbine were numerically simulated in real-time and coupled with the experimental model of the turbine/electrical generator set in a hardware-in-the-loop configuration. The experimental results allowed the dynamic behaviour of the PTO to be characterized and provided validation of the proposed control algorithms that ensure operation within safe limits.

Suggested Citation

  • Henriques, J.C.C. & Gomes, R.P.F. & Gato, L.M.C. & Falcão, A.F.O. & Robles, E. & Ceballos, S., 2016. "Testing and control of a power take-off system for an oscillating-water-column wave energy converter," Renewable Energy, Elsevier, vol. 85(C), pages 714-724.
    • Handle: RePEc:eee:renene:v:85:y:2016:i:c:p:714-724
    DOI: 10.1016/j.renene.2015.07.015
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    References listed on IDEAS

    as
    1. Falcão, A.F.O. & Gato, L.M.C. & Nunes, E.P.A.S., 2013. "A novel radial self-rectifying air turbine for use in wave energy converters. Part 2. Results from model testing," Renewable Energy, Elsevier, vol. 53(C), pages 159-164.
    2. Henriques, J.C.C. & Lopes, M.F.P. & Gomes, R.P.F. & Gato, L.M.C. & Falcão, A.F.O., 2012. "On the annual wave energy absorption by two-body heaving WECs with latching control," Renewable Energy, Elsevier, vol. 45(C), pages 31-40.
    3. López, Iraide & Andreu, Jon & Ceballos, Salvador & Martínez de Alegría, Iñigo & Kortabarria, Iñigo, 2013. "Review of wave energy technologies and the necessary power-equipment," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 413-434.
    4. Gomes, R.P.F. & Henriques, J.C.C. & Gato, L.M.C. & Falcão, A.F.O., 2012. "Hydrodynamic optimization of an axisymmetric floating oscillating water column for wave energy conversion," Renewable Energy, Elsevier, vol. 44(C), pages 328-339.
    5. Falcão, A.F.O. & Gato, L.M.C. & Nunes, E.P.A.S., 2013. "A novel radial self-rectifying air turbine for use in wave energy converters," Renewable Energy, Elsevier, vol. 50(C), pages 289-298.
    6. Falcão, António F.O. & Henriques, João C.C. & Cândido, José J., 2012. "Dynamics and optimization of the OWC spar buoy wave energy converter," Renewable Energy, Elsevier, vol. 48(C), pages 369-381.
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