A high-precise model for the hydraulic power take-off of a raft-type wave energy converter

Changhai Liu, Min Hu, Wenzhi Gao, Jian Chen, Yishan Zeng, Daozhu Wei, Qingjun Yang and Gang Bao

Energy, 2021, vol. 215, issue PA

Abstract: To accurately describe the power transmission in the hydraulic power take-off (HPTO) system, a high-precise model for the HPTO system of a raft-type wave energy converter is presented. The model incorporates all the necessary dynamics and the undesirable physical effects, such as pressure drop, flowrate leakage, flow resistance, and friction. The model is validated by the comparison with the results obtained using a hardware-in-the-loop test rig and results show that the proposed model can describe the power transmission more accurately than previous models. Furthermore, the research focuses on the holistic performance of the HPTO system including the transmission efficiencies of HPTO components, the overall transmission efficiency of HPTO system and the power losses of HPTO components across a wide range of wave parameters. Results show that the power losses from each component and the efficiencies of the hydraulic cylinder and the generator increase as wave height increases or raft length-to-wavelength ratio approaches the optimal value, while the efficiencies of the check valves and the pipeline display inverse variation tendencies. Besides, the hydraulic motor is the main contributor to the overall power losses and the HPTO efficiency displays a similar variation tendency against wave parameters with that of the hydraulic motor.

Keywords: Hydraulic power take-off system; Wave energy converter; Transmission efficiency; Undesirable physical effects; Power losses (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:215:y:2021:i:pa:s0360544220322143

DOI: 10.1016/j.energy.2020.119107

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