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Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter

Author

Listed:
  • Yue Hong

    (Division for Electricity, Uppsala University, Uppsala 75121, Sweden)

  • Mikael Eriksson

    (Division for Electricity, Uppsala University, Uppsala 75121, Sweden
    Seabased AB, Sylveniusgatan 5 D, Uppsala 75450, Sweden)

  • Cecilia Boström

    (Division for Electricity, Uppsala University, Uppsala 75121, Sweden)

  • Rafael Waters

    (Division for Electricity, Uppsala University, Uppsala 75121, Sweden
    Seabased AB, Sylveniusgatan 5 D, Uppsala 75450, Sweden)

Abstract

The Lysekil wave energy converter (WEC), developed by the wave energy research group of Uppsala University, has evolved through a variety of mechanical designs since the first prototype was installed in 2006. The hundreds of engineering decisions made throughout the design processes have been based on a combination of theory, know-how from previous experiments, and educated guesses. One key parameter in the design of the WECs linear generator is the stroke length. A long stroke requires a taller WEC with associated economical and mechanical challenges, but a short stroke limits the power production. The 2-m stroke of the current WECs has been an educated guess for the Swedish wave climate, though the consequences of this choice on energy absorption have not been studied. When the WEC technology is considered for international waters, with larger waves and challenges of energy absorption and survivability, the subject of stroke length becomes even more relevant. This paper studies the impact of generator stroke length on energy absorption for three sites off the coasts of Sweden, Chile and Scotland. 2-m, 4-m, and unlimited stroke are considered. Power matrices for the studied WEC prototype are presented for each of the studied stroke lengths. Presented results quantify the losses incurred by a limited stroke. The results indicate that a 2-m stroke length is likely to be a good choice for Sweden, but 4-m is likely to be necessary in more energetic international waters.

Suggested Citation

  • Yue Hong & Mikael Eriksson & Cecilia Boström & Rafael Waters, 2016. "Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter," Energies, MDPI, vol. 9(9), pages 1-12, September.
  • Handle: RePEc:gam:jeners:v:9:y:2016:i:9:p:730-:d:77831
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    References listed on IDEAS

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    1. Hong, Yue & Waters, Rafael & Boström, Cecilia & Eriksson, Mikael & Engström, Jens & Leijon, Mats, 2014. "Review on electrical control strategies for wave energy converting systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 329-342.
    2. Waters, Rafael & Engström, Jens & Isberg, Jan & Leijon, Mats, 2009. "Wave climate off the Swedish west coast," Renewable Energy, Elsevier, vol. 34(6), pages 1600-1606.
    3. Ekström, Rickard & Kurupath, Venugopalan & Svensson, Olle & Leijon, Mats, 2013. "Measurement system design and implementation for grid-connected marine substation," Renewable Energy, Elsevier, vol. 55(C), pages 338-346.
    4. Castellucci, Valeria & Waters, Rafael & Eriksson, Markus & Leijon, Mats, 2013. "Tidal effect compensation system for point absorbing wave energy converters," Renewable Energy, Elsevier, vol. 51(C), pages 247-254.
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    2. Yetkin, Mertcan & Kalidoss, Sudharsan & Curtis, Frank E. & Snyder, Lawrence V. & Banerjee, Arindam, 2021. "Practical optimal control of a wave-energy converter in regular wave environments," Renewable Energy, Elsevier, vol. 171(C), pages 1382-1394.
    3. Vincenzo Piscopo & Guido Benassai & Renata Della Morte & Antonio Scamardella, 2018. "Cost-Based Design and Selection of Point Absorber Devices for the Mediterranean Sea," Energies, MDPI, vol. 11(4), pages 1-23, April.
    4. Yue Hong & Irina Temiz & Jianfei Pan & Mikael Eriksson & Cecilia Boström, 2021. "Damping Studies on PMLG-Based Wave Energy Converter under Oceanic Wave Climates," Energies, MDPI, vol. 14(4), pages 1-21, February.
    5. Piscopo, V. & Benassai, G. & Della Morte, R. & Scamardella, A., 2020. "Towards a unified formulation of time and frequency-domain models for point absorbers with single and double-body configuration," Renewable Energy, Elsevier, vol. 147(P1), pages 1525-1539.
    6. Rafael Guardeño & Agustín Consegliere & Manuel J. López, 2018. "A Study about Performance and Robustness of Model Predictive Controllers in a WEC System," Energies, MDPI, vol. 11(10), pages 1-23, October.
    7. Malin Göteman & Cameron McNatt & Marianna Giassi & Jens Engström & Jan Isberg, 2018. "Arrays of Point-Absorbing Wave Energy Converters in Short-Crested Irregular Waves," Energies, MDPI, vol. 11(4), pages 1-22, April.

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