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    Latching control of a floating oscillating-water-column wave energy converter

    Identifiers
    URI: http://hdl.handle.net/11556/184
    ISSN: 0960-1481
    DOI: 10.1016/j.renene.2015.12.065
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    Author/s
    Henriques, J.C.C.; Gato, L.M.C.; Falcao, A.F.O.; Robles, Eider; Fay, F.-X.
    Date
    2016-05
    Keywords
    Wave energy
    Oscillating-water-column
    Latching control
    Receding horizon
    OWC spar-buoy
    Abstract
    The OWC spar-buoy is an axisymmetric floating version of an oscillating-water-column (OWC) based device whose power take-off (PTO) system is an air turbine/generator set. Latching has been regarded as one of the most promising techniques to improve the efficiency of wave energy converters. In the case of the OWC spar-buoy, latching control is performed by opening/closing a high-speed stop valve installed in series with the turbine. The present paper has three main objectives. Firstly, to assess the performance improvements that can be achieved with a latching control strategy within a receding horizon framework. Secondly, to establish the practical requirements of this type of control by evaluating the sensitivity of the turbine power output to several receding horizon time intervals. Finally, to test and validate experimentally the proposed algorithms in a small-scale PTO test rig. All the experimental tests were performed considering irregular wave conditions.
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