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Impact of Tidal Level Variations on Wave Energy Absorption at Wave Hub

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  • Valeria Castellucci

    (Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Ångström Lab., Lägerhyddsvägen 1, Uppsala University, Uppsala 75121, Sweden)

  • Mikael Eriksson

    (Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Ångström Lab., Lägerhyddsvägen 1, Uppsala University, Uppsala 75121, Sweden)

  • Rafael Waters

    (Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Ångström Lab., Lägerhyddsvägen 1, Uppsala University, Uppsala 75121, Sweden)

Abstract

The energy absorption of the wave energy converters (WEC) characterized by a limited stroke length —like the point absorbers developed at Uppsala University—depends on the sea level variation at the deployment site. In coastal areas characterized by high tidal ranges, the daily energy production of the generators is not optimal. The study presented in this paper quantifies the effects of the changing sea level at the Wave Hub test site, located at the south-west coast of England. This area is strongly affected by tides: the tidal height calculated as the difference between the Mean High Water Spring and the Mean Low Water Spring in 2014 was about 6.6 m. The results are obtained from a hydro-mechanic model that analyzes the behaviour of the point absorber at the Wave Hub, taking into account the sea state occurrence scatter diagram and the tidal time series at the site. It turns out that the impact of the tide decreases the energy absorption by 53%. For this reason, the need for a tidal compensation system to be included in the design of the WEC becomes compelling. The economic advantages are evaluated for different scenarios: the economic analysis proposed within the paper allows an educated guess to be made on the profits. The alternative of extending the stroke length of the WEC is investigated, and the gain in energy absorption is estimated.

Suggested Citation

  • Valeria Castellucci & Mikael Eriksson & Rafael Waters, 2016. "Impact of Tidal Level Variations on Wave Energy Absorption at Wave Hub," Energies, MDPI, vol. 9(10), pages 1-11, October.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:10:p:843-:d:80846
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    References listed on IDEAS

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    1. Valeria Castellucci & Johan Abrahamsson & Tobias Kamf & Rafael Waters, 2015. "Nearshore Tests of the Tidal Compensation System for Point-Absorbing Wave Energy Converters," Energies, MDPI, vol. 8(4), pages 1-20, April.
    2. van Nieuwkoop, Joana C.C. & Smith, Helen C.M. & Smith, George H. & Johanning, Lars, 2013. "Wave resource assessment along the Cornish coast (UK) from a 23-year hindcast dataset validated against buoy measurements," Renewable Energy, Elsevier, vol. 58(C), pages 1-14.
    3. Ekström, Rickard & Ekergård, Boel & Leijon, Mats, 2015. "Electrical damping of linear generators for wave energy converters—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 42(C), pages 116-128.
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    Cited by:

    1. Temiz, Irina & Leijon, Jennifer & Ekergård, Boel & Boström, Cecilia, 2018. "Economic aspects of latching control for a wave energy converter with a direct drive linear generator power take-off," Renewable Energy, Elsevier, vol. 128(PA), pages 57-67.
    2. Jennifer Leijon & Jonathan Sjölund & Boel Ekergård & Cecilia Boström & Sandra Eriksson & Irina Temiz & Mats Leijon, 2017. "Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power," Energies, MDPI, vol. 11(1), pages 1-13, December.
    3. Simon Thomas & Marianna Giassi & Malin Göteman & Martyn Hann & Edward Ransley & Jan Isberg & Jens Engström, 2018. "Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off," Energies, MDPI, vol. 11(9), pages 1-17, September.
    4. Raju Ahamed & Kristoffer McKee & Ian Howard, 2022. "A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems," Sustainability, MDPI, vol. 14(16), pages 1-42, August.
    5. Mohd Nasir Ayob & Valeria Castellucci & Johan Abrahamsson & Rafael Waters, 2019. "A Remotely Controlled Sea Level Compensation System for Wave Energy Converters," Energies, MDPI, vol. 12(10), pages 1-16, May.

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