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Efficiency Improvement of a Hydraulic Power Take-off of Wave Energy Converter Using Variable Displacement Motor

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Abstract

Wave energy is known to be a promising energy source for the goal of environmental protection and reducing dependence on fossil fuel sources. Hydraulic power-take-off (HPTO) is a key technology of wave energy converters which determines the energy recovery efficiency of the whole system. This paper presents a novel control strategy for HPTO to enhance the regenerated power and energy efficiency by using a suitable configuration of a variable displacement hydraulic motor and a generator. A control management strategy was designed to adjust the tilt angle of the hydraulic motor and the generator resistance load to maintain them working in the highest performance area under variable wave conditions. To verify the proposed system, a simulation model was built in AMESim software based on the previous experiment test bench configuration. Simulation results showed that by applying the proposed strategy, the generated energy increased during the working process. Compared with other control methods, the improvement of energy generation efficiency of the proposed control management method was approximately 10% higher in the low and medium wave conditions.

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Abbreviations

\({E}_{h}\) :

Hydraulic energy (kJ)

\({P}_{m}\) :

Pressure of the hydraulic motor (bar)

\({Q}_{m}\) :

Flow rates through the hydraulic motor (lpm)

\(D\) :

Displacement of the hydraulic motor (cc/rev)

\({\omega }_{m}\) :

Rotational speed of the hydraulic motor (rpm)

\({\eta }_{v}\) :

Hydraulic motor volumetric efficiency

\({D}_{m}\) :

Maximum displacement of the hydraulic motor (cc/rev)

\({E}_{m}\) :

Mechanical energy (kJ)

\({T}_{m}\) :

Torque of the hydraulic motor (Nm)

\({\eta }_{m}\) :

Hydraulic motor mechanical efficiency

\({\Delta }p\) :

Pressure difference between two ports (bar)

\({\eta }_{gen}\) :

Generated efficiency

\({E}_{gen}\) :

Generated energy (kJ)

\({\eta }_{tot}\) :

Overall efficiency

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Acknowledgements

This research was supported by the 2021 Research fund of University of Ulsan.

Funding

This research was supported by Basic Science Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT, South Korea (NRF-2020R1A2B5B03001480).

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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, University of Ulsan, 93, Daehak-ro, Namgu, Ulsan, 680-749, South Korea

    Tri Cuong Do

  2. Department of Mechatronics, Ho Chi Minh City University of Technology and Education, Ho Chi Minh City, 700000, Vietnam

    Tri Dung Dang

  3. School of Mechanical Engineering, University of Ulsan, 93, Daehak-ro, Namgu, Ulsan, 680-749, South Korea

    Kyoung Kwan Ahn

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  1. Tri Cuong Do
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Contributions

KKA: Project administration, funding acquisition, supervision. TCD: Conceptualization, data curation, writing—original draft. TDD: Methodology, investigation, writing—review and editing.

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Correspondence to Kyoung Kwan Ahn.

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Do, T.C., Dang, T.D. & Ahn, K.K. Efficiency Improvement of a Hydraulic Power Take-off of Wave Energy Converter Using Variable Displacement Motor. Int. J. of Precis. Eng. and Manuf.-Green Tech. 9, 1087–1099 (2022). https://doi.org/10.1007/s40684-021-00371-2

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