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Experimental Investigation of a Hybrid Device Combining a Wave Energy Converter and a Floating Breakwater in a Wave Flume Equipped with a Controllable Actuator

Author

Listed:
  • Luca Martinelli

    (Civil, Environmental and Architectural Engineering (ICEA) Department, University of Padova, 35129 Padova, Italy)

  • Giulio Capovilla

    (Civil, Environmental and Architectural Engineering (ICEA) Department, University of Padova, 35129 Padova, Italy)

  • Matteo Volpato

    (Civil, Environmental and Architectural Engineering (ICEA) Department, University of Padova, 35129 Padova, Italy)

  • Piero Ruol

    (Civil, Environmental and Architectural Engineering (ICEA) Department, University of Padova, 35129 Padova, Italy)

  • Chiara Favaretto

    (Civil, Environmental and Architectural Engineering (ICEA) Department, University of Padova, 35129 Padova, Italy)

  • Eva Loukogeorgaki

    (Department of Civil Engineering, Faculty of Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece)

  • Mauro Andriollo

    (Department of Industrial Engineering (DEI), University of Padova, Via Venezia, 1, 35131 Padova, Italy)

Abstract

This paper presents a hydrodynamic investigation carried out on the “Wave Attenuator” device, which is a new type of floating breakwater anchored with piles and equipped with a linear Power Take Off (PTO) mechanism, which is typical for wave energy converters. The device is tested in the wave flume, under regular waves, in slightly non-linear conditions. The PTO mechanism, that restrains one of the two degrees of freedom, is simulated through an actuator and a programmable logic controller with preassigned strategy. The paper presents the system identification procedure followed in the laboratory, supported by a numerical investigation essential to set up a credible control strategy aiming at maximizing the wave energy harvesting. The maximum power conversion efficiency under the optimal PTO control strategy is found: it is of order 50–70% when the incident wave frequency is lower than the resonance one, and only of order 20% for higher frequencies. This type of experimental investigation is essential to evaluate the actual efficiency limitations imposed by device geometry.

Suggested Citation

  • Luca Martinelli & Giulio Capovilla & Matteo Volpato & Piero Ruol & Chiara Favaretto & Eva Loukogeorgaki & Mauro Andriollo, 2023. "Experimental Investigation of a Hybrid Device Combining a Wave Energy Converter and a Floating Breakwater in a Wave Flume Equipped with a Controllable Actuator," Energies, MDPI, vol. 17(1), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:17:y:2023:i:1:p:40-:d:1304451
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    References listed on IDEAS

    as
    1. Luca Martinelli & Matteo Volpato & Chiara Favaretto & Piero Ruol, 2019. "Hydraulic Experiments on a Small-Scale Wave Energy Converter with an Unconventional Dummy Pto," Energies, MDPI, vol. 12(7), pages 1-12, March.
    2. Morten Bech Kramer & Jacob Andersen & Sarah Thomas & Flemming Buus Bendixen & Harry Bingham & Robert Read & Nikolaj Holk & Edward Ransley & Scott Brown & Yi-Hsiang Yu & Thanh Toan Tran & Josh Davidson, 2021. "Highly Accurate Experimental Heave Decay Tests with a Floating Sphere: A Public Benchmark Dataset for Model Validation of Fluid–Structure Interaction," Energies, MDPI, vol. 14(2), pages 1-36, January.
    3. Neshat, Mehdi & Mirjalili, Seyedali & Sergiienko, Nataliia Y. & Esmaeilzadeh, Soheil & Amini, Erfan & Heydari, Azim & Garcia, Davide Astiaso, 2022. "Layout optimisation of offshore wave energy converters using a novel multi-swarm cooperative algorithm with backtracking strategy: A case study from coasts of Australia," Energy, Elsevier, vol. 239(PE).
    4. Francesco Ferri & Simon Ambühl & Boris Fischer & Jens Peter Kofoed, 2014. "Balancing Power Output and Structural Fatigue of Wave Energy Converters by Means of Control Strategies," Energies, MDPI, vol. 7(4), pages 1-28, April.
    5. Dallavalle, Elisa & Cipolletta, Mariasole & Casson Moreno, Valeria & Cozzani, Valerio & Zanuttigh, Barbara, 2021. "Towards green transition of touristic islands through hybrid renewable energy systems. A case study in Tenerife, Canary Islands," Renewable Energy, Elsevier, vol. 174(C), pages 426-443.
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