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Speed control of oil-hydraulic power take-off system for oscillating body type wave energy converters

Author

Listed:
  • Gaspar, José F.
  • Kamarlouei, Mojtaba
  • Sinha, Ashank
  • Xu, Haitong
  • Calvário, Miguel
  • Faÿ, François-Xavier
  • Robles, Eider
  • Soares, C. Guedes

Abstract

The variable displacement oil-hydraulic pumps for the Power Take-Off (PTO) of wave energy converters must work above 80% of maximum displacement in order to have an overall efficiency of approximately 94.5%. This is achieved by controlling their rotational speed when the oil-hydraulic power fluctuates in time. Three speed control strategies have been presented, the first fixing the maximum possible speed in each sea state, the second by slowly varying the pump speed between speed peak values and average ones, and the third by working with highly variable speed reference values. The worst pump efficiency is achieved with the first strategy while the best one with the third strategy. However, the first has less impact than the third one in the pump lifecycle. On the other hand, the second strategy is used to make a trade-off between pump efficiency and lifecycle. However, this paper presents a fourth speed control strategy, which is a hybrid of the second and third strategies. So, the objectives of this paper were to know if these strategies are implementable in a test rig and also on a new PTO concept and determining what modifications should be introduced in these PTO strategies and hardware. This paper also contributes with the application of new methodologies in this field of research for the modelling of pump efficiency and pressure control, such as Neuro-Fuzzy modelling and Fuzzy Logic control systems.

Suggested Citation

  • Gaspar, José F. & Kamarlouei, Mojtaba & Sinha, Ashank & Xu, Haitong & Calvário, Miguel & Faÿ, François-Xavier & Robles, Eider & Soares, C. Guedes, 2016. "Speed control of oil-hydraulic power take-off system for oscillating body type wave energy converters," Renewable Energy, Elsevier, vol. 97(C), pages 769-783.
    • Handle: RePEc:eee:renene:v:97:y:2016:i:c:p:769-783
    DOI: 10.1016/j.renene.2016.06.015
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    References listed on IDEAS

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    Cited by:

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    5. Mohd Afifi Jusoh & Mohd Zamri Ibrahim & Muhamad Zalani Daud & Aliashim Albani & Zulkifli Mohd Yusop, 2019. "Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review," Energies, MDPI, vol. 12(23), pages 1-23, November.
    6. Wang, Liguo & Isberg, Jan & Tedeschi, Elisabetta, 2018. "Review of control strategies for wave energy conversion systems and their validation: the wave-to-wire approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 366-379.
    7. Henriques, J.C.C. & Gato, L.M.C. & Lemos, J.M. & Gomes, R.P.F. & Falcão, A.F.O., 2016. "Peak-power control of a grid-integrated oscillating water column wave energy converter," Energy, Elsevier, vol. 109(C), pages 378-390.
    8. 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.
    9. De Koker, Kristof L. & Crevecoeur, Guillaume & Meersman, Bart & Vantorre, Marc & Vandevelde, Lieven, 2017. "A wave emulator for ocean wave energy, a Froude-scaled dry power take-off test setup," Renewable Energy, Elsevier, vol. 105(C), pages 712-721.
    10. Yang, Shaohui & He, Hongzhou & Chen, Hu & Wang, Yongqing & Li, Hui & Zheng, Songgen, 2019. "Experimental study on the performance of a floating array-point-raft wave energy converter under random wave conditions," Renewable Energy, Elsevier, vol. 139(C), pages 538-550.
    11. Segura, E. & Morales, R. & Somolinos, J.A., 2018. "Economic-financial modeling for marine current harnessing projects," Energy, Elsevier, vol. 158(C), pages 859-880.
    12. Tao Wang & He Wang, 2017. "Research on an Integrated Hydrostatic-Driven Electric Generator with Controllable Load for Renewable Energy Applications," Energies, MDPI, vol. 10(9), pages 1-17, August.
    13. Gaspar, José F. & Kamarlouei, Mojtaba & Sinha, Ashank & Xu, Haitong & Calvário, Miguel & Faÿ, François-Xavier & Robles, Eider & Guedes Soares, C., 2017. "Analysis of electrical drive speed control limitations of a power take-off system for wave energy converters," Renewable Energy, Elsevier, vol. 113(C), pages 335-346.
    14. Henriques, J.C.C. & Portillo, J.C.C. & Sheng, W. & Gato, L.M.C. & Falcão, A.F.O., 2019. "Dynamics and control of air turbines in oscillating-water-column wave energy converters: Analyses and case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 571-589.
    15. Gaspar, José F. & Calvário, Miguel & Kamarlouei, Mojtaba & Soares, C. Guedes, 2018. "Design tradeoffs of an oil-hydraulic power take-off for wave energy converters," Renewable Energy, Elsevier, vol. 129(PA), pages 245-259.
    16. Burgaç, Alper & Yavuz, Hakan, 2019. "Fuzzy Logic based hybrid type control implementation of a heaving wave energy converter," Energy, Elsevier, vol. 170(C), pages 1202-1214.
    17. Penalba, Markel & Davidson, Josh & Windt, Christian & Ringwood, John V., 2018. "A high-fidelity wave-to-wire simulation platform for wave energy converters: Coupled numerical wave tank and power take-off models," Applied Energy, Elsevier, vol. 226(C), pages 655-669.

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