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Study on Optimum Power Take-Off Torque of an Asymmetric Wave Energy Converter in Western Sea of Jeju Island

Author

Listed:
  • Haeng Sik Ko

    (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Korea)

  • Sangho Kim

    (Green-Ship Research Division, Research Institute of Medium & Small Shipbuilding (RIMS), Busan 46757, Korea)

  • Yoon Hyeok Bae

    (Department of Ocean System Engineering, Jeju National University, Jeju 63243, Korea)

Abstract

This study primarily investigates an optimum energy conversion efficiency of asymmetric wave energy converter (WEC). A power take-off (PTO) system that provides a constant load torque opposite to pitch motion was implemented. Incident wave conditions were selected based on the measured data in the western sea of Jeju Island, South Korea. An optimum torque was calculated by comparing the time-averaged extracted power with various PTO load torque. InterDyMFoam solver based on Reynolds-averaged Navier-Stokes (RANS) equations were used in an OpenFOAM v4.0 framework—an open-source computational fluid dynamics model—against the experimental results derived from the wave flume. The upward pitch excursion was induced by wave force due to the asymmetric WEC characteristics; however, the downward pitch excursion depends on its weight. Numerically, the PTO torque was only loaded in uni-direction against the upward pitch motion. Moreover, the optimum PTO torque was estimated by comparing the time-averaged extracted power. Finally, the optimum PTO torque was evaluated by an irregular wave as a function of significant wave height. The optimum PTO provides design information about the asymmetric wave energy converter to improve energy conversion efficiency.

Suggested Citation

  • Haeng Sik Ko & Sangho Kim & Yoon Hyeok Bae, 2021. "Study on Optimum Power Take-Off Torque of an Asymmetric Wave Energy Converter in Western Sea of Jeju Island," Energies, MDPI, vol. 14(5), pages 1-12, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1449-:d:512088
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    References listed on IDEAS

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    1. Sheng, Wanan & Alcorn, Raymond & Lewis, Anthony, 2015. "On improving wave energy conversion, part I: Optimal and control technologies," Renewable Energy, Elsevier, vol. 75(C), pages 922-934.
    2. Sheng, Wanan & Alcorn, Raymond & Lewis, Anthony, 2015. "On improving wave energy conversion, part II: Development of latching control technologies," Renewable Energy, Elsevier, vol. 75(C), pages 935-944.
    3. Babarit, A. & Hals, J. & Muliawan, M.J. & Kurniawan, A. & Moan, T. & Krokstad, J., 2012. "Numerical benchmarking study of a selection of wave energy converters," Renewable Energy, Elsevier, vol. 41(C), pages 44-63.
    4. Wu, Jinming & Yao, Yingxue & Zhou, Liang & Göteman, Malin, 2018. "Real-time latching control strategies for the solo Duck wave energy converter in irregular waves," Applied Energy, Elsevier, vol. 222(C), pages 717-728.
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    Cited by:

    1. Yazdi, Hossein & Ghafari, Hamid Reza & Ghassemi, Hassan & He, Guanghua & Karimirad, Madjid, 2023. "Wave power extraction by Multi-Salter's duck WECs arrayed on the floating offshore wind turbine platform," Energy, Elsevier, vol. 278(PA).
    2. Sunny Kumar Poguluri & Dongeun Kim & Yoon Hyeok Bae, 2024. "A Numerical Investigation of the Hydrodynamic Performance of a Pitch-Type Wave Energy Converter Using Weakly and Fully Nonlinear Models," Energies, MDPI, vol. 17(4), pages 1-28, February.

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