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Title: Feedback Resonating Control for a Wave Energy Converter

Abstract

Through the use of advanced control techniques, wave energy converters (WECs) can achieve substantial increases in energy absorption. The motion of the WEC device is a significant contribution to the energy absorbed by the device. Reactive (complex conjugate) control maximizes the energy absorption due to the impedance matching. The issue with complex conjugate control is that, in general, the controller is noncausal, which requires prediction of the incoming waves. This article explores the potential of employing system identification techniques to build a causal transfer function that approximates the complex conjugate controller over a finite frequency band of interest. This approach is quite viable given the band-limited nature of ocean waves. The resulting controller is stable, and the average efficiency of the power captured by the causal controller in realistic ocean waves is 99%, when compared to the noncausal complex conjugate.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1607499
Report Number(s):
SAND-2020-0174J
Journal ID: ISSN 0093-9994; 681842
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Industry Applications
Additional Journal Information:
Journal Volume: 56; Journal Issue: 2; Journal ID: ISSN 0093-9994
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
16 TIDAL AND WAVE POWER; Mathematical model; Impedance; Force; Impedance matching; Iron; Absorption; Transfer functions

Citation Formats

Bacelli, Giorgio, Nevarez, Victor, Coe, Ryan Geoffrey, and Wilson, David G. Feedback Resonating Control for a Wave Energy Converter. United States: N. p., 2019. Web. https://doi.org/10.1109/TIA.2019.2958018.
Bacelli, Giorgio, Nevarez, Victor, Coe, Ryan Geoffrey, & Wilson, David G. Feedback Resonating Control for a Wave Energy Converter. United States. https://doi.org/10.1109/TIA.2019.2958018
Bacelli, Giorgio, Nevarez, Victor, Coe, Ryan Geoffrey, and Wilson, David G. Fri . "Feedback Resonating Control for a Wave Energy Converter". United States. https://doi.org/10.1109/TIA.2019.2958018. https://www.osti.gov/servlets/purl/1607499.
@article{osti_1607499,
title = {Feedback Resonating Control for a Wave Energy Converter},
author = {Bacelli, Giorgio and Nevarez, Victor and Coe, Ryan Geoffrey and Wilson, David G.},
abstractNote = {Through the use of advanced control techniques, wave energy converters (WECs) can achieve substantial increases in energy absorption. The motion of the WEC device is a significant contribution to the energy absorbed by the device. Reactive (complex conjugate) control maximizes the energy absorption due to the impedance matching. The issue with complex conjugate control is that, in general, the controller is noncausal, which requires prediction of the incoming waves. This article explores the potential of employing system identification techniques to build a causal transfer function that approximates the complex conjugate controller over a finite frequency band of interest. This approach is quite viable given the band-limited nature of ocean waves. The resulting controller is stable, and the average efficiency of the power captured by the causal controller in realistic ocean waves is 99%, when compared to the noncausal complex conjugate.},
doi = {10.1109/TIA.2019.2958018},
journal = {IEEE Transactions on Industry Applications},
number = 2,
volume = 56,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
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