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Numerical and experimental study on a hemispheric point-absorber-type wave energy converter with a hydraulic power take-off system

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  • Kim, Sung-Jae
  • Koo, Weoncheol
  • Shin, Min-Jae

Abstract

This study examined the performance of a hemispherical point-absorber wave energy converter (WEC) with a hydraulic power take-off (PTO) system. The hydraulic PTO system for power generation was modeled as an approximate coulomb damping force, which was recently proposed to reduce numerical error. To examine the hydrodynamic performance of the WEC, a three-dimensional frequency-domain numerical wave tank technique was adopted, in which the wave radiation problem and diffraction problem for a hemispherical buoy were solved in succession to obtain the hydrodynamic coefficients. The Cummins equation was also adopted to simulate the buoy displacement and extracted wave power in the time domain. For comparison, a three-dimensional wave tank experiment was conducted. Various viscous damping and energy loss from WEC system and hydraulic cylinder pressure of the PTO system were measured from the experimental results, and these values were added to the governing equation of buoy motion. Therefore, the final numerical model of the WEC system contained the viscous damping and hydraulic PTO forces as well as the potential-flow-based hydrodynamic coefficients. Using the developed numerical model, the hemispheric buoy displacement and extracted wave power were calculated for various hydraulic pressures and input wave conditions to determine the optimal conditions for the maximum wave power.

Suggested Citation

  • Kim, Sung-Jae & Koo, Weoncheol & Shin, Min-Jae, 2019. "Numerical and experimental study on a hemispheric point-absorber-type wave energy converter with a hydraulic power take-off system," Renewable Energy, Elsevier, vol. 135(C), pages 1260-1269.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:1260-1269
    DOI: 10.1016/j.renene.2018.09.097
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    References listed on IDEAS

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    1. Markel Penalba & Nathan P. Sell & Andy J. Hillis & John V. Ringwood, 2017. "Validating a Wave-to-Wire Model for a Wave Energy Converter—Part I: The Hydraulic Transmission System," Energies, MDPI, vol. 10(7), pages 1-22, July.
    2. 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.
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    3. José Carlos Ugaz Peña & Christian Luis Medina Rodríguez & Gustavo O. Guarniz Avalos, 2023. "Study of a New Wave Energy Converter with Perturb and Observe Maximum Power Point Tracking Method," Sustainability, MDPI, vol. 15(13), pages 1-18, July.
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    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. Guo, Bingyong & Ringwood, John V., 2021. "Geometric optimisation of wave energy conversion devices: A survey," Applied Energy, Elsevier, vol. 297(C).
    7. Sricharan, V.V.S. & Chandrasekaran, Srinivasan, 2021. "Time-domain analysis of a bean-shaped multi-body floating wave energy converter with a hydraulic power take-off using WEC-Sim," Energy, Elsevier, vol. 223(C).
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    9. Wei Zhang & Shizhen Li & Yanjun Liu & Detang Li & Qin He, 2020. "Optimal Control for Hydraulic Cylinder Tracking Displacement of Wave Energy Experimental Platform," Energies, MDPI, vol. 13(11), pages 1-17, June.
    10. Chen, Zheng & Sun, Jili & Yang, Jingqing & Sun, Yong & Chen, Qian & Zhao, Hongyang & Qian, Peng & Si, Yulin & Zhang, Dahai, 2024. "Experimental and numerical analysis of power take-off control effects on the dynamic performance of a floating wind-wave combined system," Renewable Energy, Elsevier, vol. 226(C).
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