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    Excitation force estimation for wave energy systems using a moment-domain representation

    Cunningham, Jake and Faedo, Nicolás and Ringwood, John (2019) Excitation force estimation for wave energy systems using a moment-domain representation. European Tidal and Wave Energy Conference Proceedings (1418). ISSN 2706-6940

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    To maximise the energy converted from a Wave Energy Converter (WEC), a real-time control law is required, which, due to its non-causal nature, necessitates the knowledge of the wave excitation force in future time. This future excitation force time series is usually obtained using forecasting strategies, which are essentially based on present and past values of the wave excitation force. Unfortunately, the excitation force is virtually always a non-measurable quantity, which leads to the necessity of a suitable estimation technique. There have been several methods developed for this unknown-input estimation problem, though some drawbacks can be readily identified. One fundamental issue comes from the convolution term accounting for the effect of radiation forces acting on the WEC. The usual approach is to approximate this convolution operation by a suitable parametric representation. However, in general, a more accurate parametric approximation directly implies a higher dimension of the model representing the WEC dynamics. This can potentially constitute a problem for real-time capabilities as it naturally increases the underlying computational complexity. In this paper, a newly developed moment-based estimator is presented, which does not require of an approximation of the radiation force dynamics. The presented moment-based estimator has been compared to an input-unknown Kalman filter, which represents a benchmark method for excitation force estimation within the wave energy community.

    Item Type: Article
    Additional Information: Funding: This paper is based upon work supported by Science Foundation Ireland under Grant No. 12/RC/2302 for the Marine Renewable Ireland (MaREI) centre. This material is based upon works supported by Science Foundation Ireland under Grant no. 13/IA/1886.
    Keywords: Wave energy; input-unknown estimation; excitation force; moment-domain;
    Academic Unit: Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Faculty of Science and Engineering > Electronic Engineering
    Item ID: 14286
    Depositing User: Professor John Ringwood
    Date Deposited: 31 Mar 2021 14:29
    Journal or Publication Title: European Tidal and Wave Energy Conference Proceedings
    Publisher: EWTEC
    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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