Power-capture Performance of the Hydraulic-type Wave Energy Converter Based on the Individual Metering Technology

doi:10.3901/JME.2024.06.386

Abstract

Abstract: A novel hydraulic power take-off (Power take-off system, PTO) system based on the individual metering technology is proposed to improve the performance of the hydraulic-type wave energy converters (Wave energy converters, WECs). A raft-type WEC is focused on here, and the hydrodynamic model of the floater and the nonlinear model of the hydraulic PTO system are presented. Considering the characteristics of real ocean waves, the power-capture performance of the WEC in irregular waves is discussed, and the influence of wave parameters and PTO parameter configuration on the power-capture performance is investigated. Results show that the novel hydraulic PTO system can significantly improve power-capture performance of the WEC. For a certain peak wave period, the larger the significant wave height, the higher the capture width ratio. For a certain significant wave height, the capture width ratio increases first and then decreases after reaching a peak value with increasing peak wave period. The capture width ratio increases monotonously with increasing piston area of hydraulic cylinder, mounting position of hydraulic cylinder, and effective damping of generator, while it decreases monotonously with increasing displacement of hydraulic motor and rod-to-piston area ratio of hydraulic cylinder. The pre-charge pressure of the high-pressure gas accumulator makes no difference to the capture width ratio, while larger value of initial volume of the high-pressure gas accumulator gives slightly smaller capture width ratio.

Key words: individual metering, hydraulic system, wave energy, power take-off system, power-capture performance

CLC Number:

TH137
TK79

LIU Changhai, ZHAO Zhixue, HU Min, YAN Hao, YANG Qingjun, BAO Gang, ZENG Yishan. Power-capture Performance of the Hydraulic-type Wave Energy Converter Based on the Individual Metering Technology[J]. Journal of Mechanical Engineering, 2024, 60(6): 386-397.

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