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Title: Optimal control of wave energy converters

Abstract

A wave energy converter and method for extracting energy from water waves maximizes the energy extraction per cycle by estimating an excitation force of heave wave motion on the buoy, computing a control force from the estimated excitation force using a dynamic model, and applying the computed control force to the buoy to extract energy from the heave wave motion. Analysis and numerical simulations demonstrate that the optimal control of a heave wave energy converter is, in general, in the form of a bang-singular-bang control; in which the optimal control at a given time can be either in the singular arc mode or in the bang-bang mode. The excitation force and its derivatives at the current time can be obtained through an estimator, for example, using measurements of pressures on the surface of the buoy in addition to measurements of the buoy position. A main advantage of this approximation method is the ease of obtaining accurate measurements for pressure on the buoy surface and for buoy position, compared to wave elevation measurements.

Inventors:
; ; ; ; ;
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1502439
Patent Number(s):
10,197,040
Application Number:
15/466,605
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Resource Relation:
Patent File Date: 2017 Mar 22
Country of Publication:
United States
Language:
English
Subject:
16 TIDAL AND WAVE POWER

Citation Formats

Abdelkhalik, Ossama, Robinett, III, Rush D., Zou, Shangyan, Bacelli, Giorgio, Wilson, David G., and Korde, Umesh. Optimal control of wave energy converters. United States: N. p., 2019. Web.
Abdelkhalik, Ossama, Robinett, III, Rush D., Zou, Shangyan, Bacelli, Giorgio, Wilson, David G., & Korde, Umesh. Optimal control of wave energy converters. United States.
Abdelkhalik, Ossama, Robinett, III, Rush D., Zou, Shangyan, Bacelli, Giorgio, Wilson, David G., and Korde, Umesh. Tue . "Optimal control of wave energy converters". United States. https://www.osti.gov/servlets/purl/1502439.
@article{osti_1502439,
title = {Optimal control of wave energy converters},
author = {Abdelkhalik, Ossama and Robinett, III, Rush D. and Zou, Shangyan and Bacelli, Giorgio and Wilson, David G. and Korde, Umesh},
abstractNote = {A wave energy converter and method for extracting energy from water waves maximizes the energy extraction per cycle by estimating an excitation force of heave wave motion on the buoy, computing a control force from the estimated excitation force using a dynamic model, and applying the computed control force to the buoy to extract energy from the heave wave motion. Analysis and numerical simulations demonstrate that the optimal control of a heave wave energy converter is, in general, in the form of a bang-singular-bang control; in which the optimal control at a given time can be either in the singular arc mode or in the bang-bang mode. The excitation force and its derivatives at the current time can be obtained through an estimator, for example, using measurements of pressures on the surface of the buoy in addition to measurements of the buoy position. A main advantage of this approximation method is the ease of obtaining accurate measurements for pressure on the buoy surface and for buoy position, compared to wave elevation measurements.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

Hierarchical Robust Control of Oscillating Wave Energy Converters With Uncertain Dynamics
journal, July 2014

  • Fusco, Francesco; Ringwood, John V.
  • IEEE Transactions on Sustainable Energy, Vol. 5, Issue 3
  • DOI: 10.1109/TSTE.2014.2313479

A review of wave-energy extraction
journal, October 2007


Estimation of excitation forces for wave energy converters control using pressure measurements
journal, September 2016


Wave energy converter control by wave prediction and dynamic programming
journal, December 2012


Constrained Optimal Control of Vibration Dampers
journal, August 1998


Optimal control of wave energy converters
journal, April 2017


Bang-bang control and singular arcs in reservoir flooding
journal, August 2007

  • Zandvliet, M. J.; Bosgra, O. H.; Jansen, J. D.
  • Journal of Petroleum Science and Engineering, Vol. 58, Issue 1-2
  • DOI: 10.1016/j.petrol.2006.12.008

Optimal Active Control and Optimization of a Wave Energy Converter
journal, April 2013