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Title: Multiresonant Feedback Control of a Three-Degree-of-Freedom Wave Energy Converter

Abstract

For a three-degree-of-freedom wave energy converter (heave, pitch, and surge), the equations of motion could be coupled depending on the buoy shape. This paper presents a multiresonant feedback control, in a general framework, for this type of a wave energy converter that is modeled by linear time invariant dynamic systems. The proposed control strategy finds the optimal control in the sense that it computes the control based on the complex conjugate criteria. This control strategy is relatively easy to implement since it is a feedback control in the time domain that requires only measurements of the buoy motion. Numerical tests are presented for two different buoy shapes: a sphere and a cylinder. Regular, Bretschnieder, and Ochi-Hubble waves are tested. Simulation results show that the proposed controller harvests energy in the pitch-surge-heave modes that is about three times the energy that can be harvested using a heave-only device. In conclusion, this multiresonant control can also be used to shift the energy harvesting between the coupled modes, which can be exploited to eliminate one of the actuators while maintaining about the same level of energy harvesting.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [1]
  1. Michigan Technological Univ., Houghton, MI (United States)
  2. 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 National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1492375
Report Number(s):
SAND-2018-12236J
Journal ID: ISSN 1949-3029; 669145
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Sustainable Energy
Additional Journal Information:
Journal Volume: 8; Journal Issue: 4; Journal ID: ISSN 1949-3029
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; multi resonant control; three degrees of freedom WEC; wave energy conversion

Citation Formats

Abdelkhalik, Ossama, Zou, Shangyan, Robinett, Rush D., Bacelli, Giorgio, Wilson, David G., Coe, Ryan, and Korde, Umesh. Multiresonant Feedback Control of a Three-Degree-of-Freedom Wave Energy Converter. United States: N. p., 2017. Web. doi:10.1109/TSTE.2017.2692647.
Abdelkhalik, Ossama, Zou, Shangyan, Robinett, Rush D., Bacelli, Giorgio, Wilson, David G., Coe, Ryan, & Korde, Umesh. Multiresonant Feedback Control of a Three-Degree-of-Freedom Wave Energy Converter. United States. doi:10.1109/TSTE.2017.2692647.
Abdelkhalik, Ossama, Zou, Shangyan, Robinett, Rush D., Bacelli, Giorgio, Wilson, David G., Coe, Ryan, and Korde, Umesh. Mon . "Multiresonant Feedback Control of a Three-Degree-of-Freedom Wave Energy Converter". United States. doi:10.1109/TSTE.2017.2692647. https://www.osti.gov/servlets/purl/1492375.
@article{osti_1492375,
title = {Multiresonant Feedback Control of a Three-Degree-of-Freedom Wave Energy Converter},
author = {Abdelkhalik, Ossama and Zou, Shangyan and Robinett, Rush D. and Bacelli, Giorgio and Wilson, David G. and Coe, Ryan and Korde, Umesh},
abstractNote = {For a three-degree-of-freedom wave energy converter (heave, pitch, and surge), the equations of motion could be coupled depending on the buoy shape. This paper presents a multiresonant feedback control, in a general framework, for this type of a wave energy converter that is modeled by linear time invariant dynamic systems. The proposed control strategy finds the optimal control in the sense that it computes the control based on the complex conjugate criteria. This control strategy is relatively easy to implement since it is a feedback control in the time domain that requires only measurements of the buoy motion. Numerical tests are presented for two different buoy shapes: a sphere and a cylinder. Regular, Bretschnieder, and Ochi-Hubble waves are tested. Simulation results show that the proposed controller harvests energy in the pitch-surge-heave modes that is about three times the energy that can be harvested using a heave-only device. In conclusion, this multiresonant control can also be used to shift the energy harvesting between the coupled modes, which can be exploited to eliminate one of the actuators while maintaining about the same level of energy harvesting.},
doi = {10.1109/TSTE.2017.2692647},
journal = {IEEE Transactions on Sustainable Energy},
number = 4,
volume = 8,
place = {United States},
year = {2017},
month = {4}
}

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Cited by: 7 works
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Figures / Tables:

Fig. 1. Fig. 1.: Geometry of a 3-DoF cylindrical Buoy; MWL is the mean water level

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Works referencing / citing this record:

Control of Three Degrees-of-Freedom Wave Energy Converters Using Pseudo-Spectral Methods
journal, January 2018

  • Abdelkhalik, Ossama; Zou, Shangyan; Robinett, Rush
  • Journal of Dynamic Systems, Measurement, and Control, Vol. 140, Issue 7
  • DOI: 10.1115/1.4038860