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    Nonlinear control of flap-type wave energy converter with a non-ideal power take-off system

    Bacelli, Giorgio and Genest, Romain and Ringwood, John (2015) Nonlinear control of flap-type wave energy converter with a non-ideal power take-off system. Annual Reviews in Control, 40. pp. 116-126. ISSN 1367-5788

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    Wave energy converters (WECs) require active control to maximise energy capture over a wide range of sea conditions, which is generally achieved by making the device resonate. The exaggerated device motion arising at resonance, however, may result in nonlinear effects that are ignored by the linear models that are typically employed. In particular, nonlinear viscous forces are significant for particular device types, such as hinged flaps, which we take as a case study in this paper. The paper develops a general nonlinear WEC control methodology based on pseudospectral methods. The continuous time energy maximisation problem is fully discretised (both state and control), and the optimal solution is obtained by solving the resulting finite dimensional optimisation problem. By way of example, the nonlinear viscous damping for a hinged flap WEC is incorporated into the control model which also considers non-ideal power take-off efficiency. It is shown that the ratio of energy captured to energy dissipated is significantly increased with the nonlinear controller, compared to the linear case.

    Item Type: Article
    Additional Information: This material is based upon works supported by Science Foundation Ireland under Grant no.13/IA/1886 and Grant no.12/RC/2302 for the Marine Renewable Ireland(MaREI)centre.
    Keywords: Wave energy devices; Nonlinear modelling;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Item ID: 9444
    Identification Number:
    Depositing User: Professor John Ringwood
    Date Deposited: 03 May 2018 16:10
    Journal or Publication Title: Annual Reviews in Control
    Publisher: Elsevier
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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