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Title: A rule-based phase control methodology for a slider-crank wave energy converter power take-off system

Abstract

The slider crank is a proven mechanical linkage system with a long history of successful applications, and the slider-crank ocean wave energy converter (WEC) is a type of WEC that converts linear motion into rotation. This paper presents a control algorithm for a slider-crank WEC. In this study, a time-domain hydrodynamic analysis is adopted, and an AC synchronous machine is used in the power take-off system to achieve relatively high system performance. Also, a rule-based phase control strategy is applied to maximize energy extraction, making the system suitable for not only regular sinusoidal waves but also irregular waves. Simulations are carried out under regular sinusoidal wave and synthetically produced irregular wave conditions; performance validations are also presented with high-precision, real ocean wave surface elevation data. The influences of significant wave height, and peak period upon energy extraction of the system are studied. Energy extraction results using the proposed method are compared to those of the passive loading and complex conjugate control strategies; results show that the level of energy extraction is between those of the passive loading and complex conjugate control strategies, and the suboptimal nature of this control strategy is verified.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1400106
Report Number(s):
NREL/JA-5000-67012
Journal ID: ISSN 2214-1669
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Marine Energy; Journal Volume: 19; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
16 TIDAL AND WAVE POWER; ocean energy; rule-based control; slider crank; wave energy converter; WEC

Citation Formats

Sang, Yuanrui, Karayaka, H. Bora, Yan, Yanjun, Zhang, James Z., Bogucki, Darek, and Yu, Yi-Hsiang. A rule-based phase control methodology for a slider-crank wave energy converter power take-off system. United States: N. p., 2017. Web. doi:10.1016/j.ijome.2017.07.001.
Sang, Yuanrui, Karayaka, H. Bora, Yan, Yanjun, Zhang, James Z., Bogucki, Darek, & Yu, Yi-Hsiang. A rule-based phase control methodology for a slider-crank wave energy converter power take-off system. United States. doi:10.1016/j.ijome.2017.07.001.
Sang, Yuanrui, Karayaka, H. Bora, Yan, Yanjun, Zhang, James Z., Bogucki, Darek, and Yu, Yi-Hsiang. Fri . "A rule-based phase control methodology for a slider-crank wave energy converter power take-off system". United States. doi:10.1016/j.ijome.2017.07.001.
@article{osti_1400106,
title = {A rule-based phase control methodology for a slider-crank wave energy converter power take-off system},
author = {Sang, Yuanrui and Karayaka, H. Bora and Yan, Yanjun and Zhang, James Z. and Bogucki, Darek and Yu, Yi-Hsiang},
abstractNote = {The slider crank is a proven mechanical linkage system with a long history of successful applications, and the slider-crank ocean wave energy converter (WEC) is a type of WEC that converts linear motion into rotation. This paper presents a control algorithm for a slider-crank WEC. In this study, a time-domain hydrodynamic analysis is adopted, and an AC synchronous machine is used in the power take-off system to achieve relatively high system performance. Also, a rule-based phase control strategy is applied to maximize energy extraction, making the system suitable for not only regular sinusoidal waves but also irregular waves. Simulations are carried out under regular sinusoidal wave and synthetically produced irregular wave conditions; performance validations are also presented with high-precision, real ocean wave surface elevation data. The influences of significant wave height, and peak period upon energy extraction of the system are studied. Energy extraction results using the proposed method are compared to those of the passive loading and complex conjugate control strategies; results show that the level of energy extraction is between those of the passive loading and complex conjugate control strategies, and the suboptimal nature of this control strategy is verified.},
doi = {10.1016/j.ijome.2017.07.001},
journal = {International Journal of Marine Energy},
number = C,
volume = 19,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}