Innovative Hydraulic Power Take-Off Construction and Performance Tests for Wave Energy Conversion

2013 ◽  
Vol 432 ◽  
pp. 316-323 ◽  
Author(s):  
J.C. Antolín-Urbaneja ◽  
J. Lasa ◽  
P. Estensoro ◽  
I. Cabanes ◽  
M. Marcos
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Initial Conditions ◽  
Low Frequency ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Geometrical Parameters ◽  
Wave Energy Conversion ◽  
Hydraulic Motor ◽  
Hydraulic Power

This document describes and demonstrates the features of a new innovative hydraulic Power take-Off (PTO) to be used for Wave Energy Conversion. This device is able to transform low frequency oscillating movement into a continuous high frequency angular speed, absorbing high fluctuated torque at the input shaft, which can reach up to 8000Nm. Moreover, the major breakthrough of this device is that it can control the braking torque through the modification of some geometrical parameters, L and R, and through the activation of more than one hydraulic cylinder together with the pressure. The output shaft of the PTO is able to rotate at different continuous rated speed through the actuation on a specific control valve at the inlet of the hydraulic motor. Tests to check the behavior of the PTO related to the smoothening of the power output and concerning the time needed to increase the high pressure and the time available after the accumulation of some quantity of energy in different initial conditions are presented.

scholarly journals Investigations of Hydraulic Power Take-Off Unit Parameters Effects on the Performance of the WAB-WECs in the Different Irregular Sea States

2021 ◽  
Vol 9 (8) ◽  
pp. 897
Author(s):  
Mohd Afifi Jusoh ◽  
Zulkifli Mohd Yusop ◽  
Aliashim Albani ◽  
Muhamad Zalani Daud ◽  
Mohd Zamri Ibrahim
Keyword(s):  
Simulation Study ◽  
Wave Energy ◽  
Electrical Power ◽  
Hydraulic Cylinder ◽  
Wave Energy Conversion ◽  
Hydraulic Motor ◽  
Complete Model ◽  
Hydraulic Power ◽  
Effective Power ◽  
Energy Conversion Systems

Hydraulic power take-off (HPTO) is considered to be one of the most effective power take-off schemes for wave energy conversion systems (WECs). The HPTO unit can be constructed using standard hydraulic components that are readily available from the hydraulic industry market. However, the construction and operation of the HPTO unit are more complex rather than other types of power take-off, as many components parameters need to be considered during the optimization. Generator damping, hydraulic motor displacement, hydraulic cylinder and accumulator size are among the important parameters that influence the HPTO performance in generating usable electricity. Therefore, the influence of these parameters on the amount of generated electrical power from the HPTO unit was investigated in the present study. A simulation study was conducted using MATLAB/Simulink software, in which a complete model of WECs was developed using the Simscape fluids toolbox. During the simulation, each parameters study of the HPTO unit were separately manipulated to investigate its effects on the WECs performance in five different sea states. Finally, the simulated result of the effect of HPTO parameters on the amount of generated electrical power from the HPTO unit in different sea states is given and discussed.

A study of a speed amplified linear generator for low-frequency wave energy conversion

2021 ◽  
Vol 149 ◽  
pp. 107226
Author(s):  
Zhenwei Liu ◽  
Xu Wang ◽  
Elie Al Shami ◽  
Nick J. Baker ◽  
Xueyu Ji
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Low Frequency ◽  
Wave Energy Conversion ◽  
Frequency Wave ◽  
Linear Generator

scholarly journals Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4510 ◽  
Author(s):  
Mohd Afifi Jusoh ◽  
Mohd Zamri Ibrahim ◽  
Muhamad Zalani Daud ◽  
Aliashim Albani ◽  
Zulkifli Mohd Yusop
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Ocean Waves ◽  
Ocean Wave ◽  
Control Mechanisms ◽  
Wave Energy Conversion ◽  
Hydraulic Power ◽  
Ocean Wave Energy ◽  
System A ◽  
Energy Conversion Systems

Ocean wave energy is one of the most abundant energy sources in the world. There is a wide variety of wave energy conversion systems that have been designed and developed, resulting from the different ways of ocean wave energy absorption and also depending on the location characteristics. This paper reviews and analyses the concepts of hydraulic power take-off (PTO) system used in various types of wave energy conversion systems so that it can be a useful reference to researchers, engineers and inventors. This paper also reviews the control mechanisms of the hydraulic PTO system in order to optimise the energy harvested from the ocean waves. Finally, the benefits and challenges of the hydraulic PTO system are discussed in this paper.

scholarly journals An Estimation of Hydraulic Power Take-off Unit Parameters for Wave Energy Converter Device Using Non-Evolutionary NLPQL and Evolutionary GA Approaches

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 79
Author(s):  
Mohd Afifi Jusoh ◽  
Mohd Zamri Ibrahim ◽  
Muhamad Zalani Daud ◽  
Zulkifli Mohd Yusop ◽  
Aliashim Albani
Keyword(s):  
Wave Energy ◽  
Human Error ◽  
Estimation Method ◽  
Hydraulic Cylinder ◽  
Hydraulic Motor ◽  
Hydraulic Power ◽  
Matlab Simulink ◽  
Irregular Wave ◽  
Wave Energy Converters ◽  
Hydraulic Accumulator

This study is concerned with the application of two major kinds of optimisation algorithms on the hydraulic power take-off (HPTO) model for the wave energy converters (WECs). In general, the HPTO unit’s performance depends on the configuration of its parameters such as hydraulic cylinder size, hydraulic accumulator capacity and pre-charge pressure and hydraulic motor displacement. Conventionally, the optimal parameters of the HPTO unit need to be manually estimated by repeating setting the parameters’ values during the simulation process. However, such an estimation method can easily be exposed to human error and would subsequently result in an inaccurate selection of HPTO parameters for WECs. Therefore, an effective approach of using the non-evolutionary Non-Linear Programming by Quadratic Lagrangian (NLPQL) and evolutionary Genetic Algorithm (GA) algorithms for determining the optimal HPTO parameters was explored in the present study. A simulation–optimisation of the HPTO model was performed in the MATLAB/Simulink environment. A complete WECs model was built using Simscape Fluids toolbox in MATLAB/Simulink. The actual specifications of hydraulic components from the manufacturer were used during the simulation study. The simulation results showed that the performance of optimal HPTO units optimised by NLPQL and GA approaches have significantly improved up to 96% and 97%, respectively, in regular wave conditions. The results also showed that both optimal HPTO units were capable of generating electricity up to 62% and 77%, respectively, of their rated capacity in irregular wave circumstances.

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