Integration Analysis and Evaluation of New Hybrid 3kW Ocean Wave Energy Extraction System

2018 ◽  
Vol 85 ◽  
pp. 1316-1320
Author(s):  
Jeongsoo Kim ◽  
Min Su Park ◽  
Youn Ju Jeong
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Extraction System ◽  
Energy Extraction ◽  
Analysis And Evaluation ◽  
Ocean Wave Energy ◽  
Integration Analysis

scholarly journals A Wave Energy Extraction System in Experimental Flume

2016 ◽  
Vol 2016 ◽  
pp. 1-4
Author(s):  
Qin Guodong ◽  
Pang Quanru ◽  
Chen Zhongxian
Keyword(s):  
Wave Energy ◽  
Ocean Waves ◽  
High Energy ◽  
Ocean Wave ◽  
High Energy Density ◽  
Extraction System ◽  
Energy Extraction ◽  
Linear Generator ◽  
Ocean Wave Energy ◽  
Experimental Flume

Ocean wave energy is a high energy density and renewable resource. High power conversion rate is an advantage of linear generators to be the competitive candidates for ocean wave energy extraction system. In this paper, the feasibility of a wave energy extraction system by linear generator has been verified in an experimental flume. Besides, the analytical equations of heaving buoy oscillating in vertical direction are proposed, and the analytical equations are proved conveniently. What is more, the active power output of linear generator of wave energy extraction system in experimental flume is presented. The theoretical analysis and experimental results play a significant role for future wave energy extraction system progress in real ocean waves.

scholarly journals An Optimal Control Method for Maximizing the Efficiency of Direct Drive Ocean Wave Energy Extraction System

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Zhongxian Chen ◽  
Haitao Yu ◽  
Cheng Wen
Keyword(s):  
Optimal Control ◽  
Wave Energy ◽  
Pid Control ◽  
Control Method ◽  
Ocean Wave ◽  
Extraction System ◽  
Energy Extraction ◽  
Direct Drive ◽  
Ocean Wave Energy ◽  
Optimal Control Method

The goal of direct drive ocean wave energy extraction system is to convert ocean wave energy into electricity. The problem explored in this paper is the design and optimal control for the direct drive ocean wave energy extraction system. An optimal control method based on internal model proportion integration differentiation (IM-PID) is proposed in this paper though most of ocean wave energy extraction systems are optimized by the structure, weight, and material. With this control method, the heavy speed of outer heavy buoy of the energy extraction system is in resonance with incident wave, and the system efficiency is largely improved. Validity of the proposed optimal control method is verified in both regular and irregular ocean waves, and it is shown that IM-PID control method is optimal in that it maximizes the energy conversion efficiency. In addition, the anti-interference ability of IM-PID control method has been assessed, and the results show that the IM-PID control method has good robustness, high precision, and strong anti-interference ability.

Feasibility study of tuned liquid column damper for ocean wave energy extraction

2017 ◽  
Author(s):  
Yihong Wong ◽  
Yeong-Jin King ◽  
An-Chow Lai ◽  
Kok-Keong Chong ◽  
Boon-Han Lim
Keyword(s):  
Feasibility Study ◽  
Wave Energy ◽  
Liquid Column ◽  
Ocean Wave ◽  
Energy Extraction ◽  
Tuned Liquid Column Damper ◽  
Ocean Wave Energy ◽  
Liquid Column Damper

Performance Enhancements and Validations of a Generic Ocean-Wave Energy Extractor

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Nathan Tom ◽  
Ronald W. Yeung
Keyword(s):  
Wave Energy ◽  
Extraction Process ◽  
Design Analysis ◽  
Experimental Results ◽  
Ocean Wave ◽  
Hydrodynamic Performance ◽  
Vortical Flow ◽  
Power Extraction ◽  
Analysis And Evaluation ◽  
Ocean Wave Energy

This paper evaluates two aspects of enhancements made to a generic ocean-wave energy extraction device, developed recently at University of California (UC)-Berkeley with features reported in Yeung et al. (2010, “Design, Analysis, and Evaluation of the UC-Berkeley Wave-Energy Extractor,” ASME J. Offshore Mech. Arct. Eng., 134(2), p. 021902). First, the differences in hydrodynamic performance between flat- and hemispherical bottom floaters were investigated theoretically using the UC Berkeley 2D viscous-flow solver: FSRVM (Seah and Yeung, 2008, “Vortical-Flow Modeling for Ship Hulls in Forward and Lateral Motion,” Proceedings of the 27th Symposium on Naval Hydrodynamics, Seoul, Korea). The predicted enhancement was compared with experimental results, demonstrating that an increase in motion of over 50% was realizable. Second, important modifications to the design, fabrication, and material of the rotor and stator of the permanent magnet linear generator (PMLG) were made with the aim to increase both power output and mechanical-to-electrical conversion efficiency, ηel. Increased power extraction and efficiency were achieved, doubling what had been previously reported. The nonlinear relationship between the generator damping and the magnet-coil gap width was also investigated to verify that the conditions for optimal power extraction presented in Yeung et al. (2010, “Design, Analysis, and Evaluation of the UC-Berkeley Wave-Energy Extractor,” ASME J. Offshore Mech. Arct. Eng., 134(2), p. 021902) were achievable with the PMLG. Experimental results, obtained from testing the coupled floater and PMLG systems in a wave tank, revealed that realized capture widths were more than double those from the previous design. These results further confirmed that matching of the generator and floater damping significantly increased the global efficiency of the extraction process.

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