Effects of wave excitation force prediction deviations on the discrete control performance of an oscillating wave energy converter

X. Zhang, J. Yang, Wenhua Zhao, L. Xiao

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

© 2015, © 2014 Taylor & Francis. Oscillating-body converters are widely used in offshore engineering, to capture wave energies. In such a case, discrete control including both latching and declutching controls is adopted to improve the power capture performance of oscillating wave energy converters (WECs). A reliable prediction of wave excitation forces on the WEC is essential for the discrete control strategy. In this study, a time domain model is developed to calculate the hydrodynamic responses of a hemispherical oscillating WEC with discrete control in regular waves. A state space model is used to deal with the convolution term in the time domain equation, taking into account the memory effects of wave surface. Based on the developed numerical model, the effects of prediction deviations, such as the amplitude and phase of wave excitation force, have been studied. It is observed that the amplitude prediction deviation exhibits very few effects on the control performance. However, the phase prediction deviation performances significantly influence on the control performance. In some conditions, the phase prediction deviation will reduce the efficiency of the discrete control.
Original languageEnglish
Pages (from-to)351-368
JournalShips and Offshore Structures
Volume11
Issue number4
DOIs
Publication statusPublished - 2016

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Convolution
Surface waves
Numerical models
Hydrodynamics
Data storage equipment

Cite this

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title = "Effects of wave excitation force prediction deviations on the discrete control performance of an oscillating wave energy converter",
abstract = "{\circledC} 2015, {\circledC} 2014 Taylor & Francis. Oscillating-body converters are widely used in offshore engineering, to capture wave energies. In such a case, discrete control including both latching and declutching controls is adopted to improve the power capture performance of oscillating wave energy converters (WECs). A reliable prediction of wave excitation forces on the WEC is essential for the discrete control strategy. In this study, a time domain model is developed to calculate the hydrodynamic responses of a hemispherical oscillating WEC with discrete control in regular waves. A state space model is used to deal with the convolution term in the time domain equation, taking into account the memory effects of wave surface. Based on the developed numerical model, the effects of prediction deviations, such as the amplitude and phase of wave excitation force, have been studied. It is observed that the amplitude prediction deviation exhibits very few effects on the control performance. However, the phase prediction deviation performances significantly influence on the control performance. In some conditions, the phase prediction deviation will reduce the efficiency of the discrete control.",
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Effects of wave excitation force prediction deviations on the discrete control performance of an oscillating wave energy converter. / Zhang, X.; Yang, J.; Zhao, Wenhua; Xiao, L.

In: Ships and Offshore Structures, Vol. 11, No. 4, 2016, p. 351-368.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of wave excitation force prediction deviations on the discrete control performance of an oscillating wave energy converter

AU - Zhang, X.

AU - Yang, J.

AU - Zhao, Wenhua

AU - Xiao, L.

PY - 2016

Y1 - 2016

N2 - © 2015, © 2014 Taylor & Francis. Oscillating-body converters are widely used in offshore engineering, to capture wave energies. In such a case, discrete control including both latching and declutching controls is adopted to improve the power capture performance of oscillating wave energy converters (WECs). A reliable prediction of wave excitation forces on the WEC is essential for the discrete control strategy. In this study, a time domain model is developed to calculate the hydrodynamic responses of a hemispherical oscillating WEC with discrete control in regular waves. A state space model is used to deal with the convolution term in the time domain equation, taking into account the memory effects of wave surface. Based on the developed numerical model, the effects of prediction deviations, such as the amplitude and phase of wave excitation force, have been studied. It is observed that the amplitude prediction deviation exhibits very few effects on the control performance. However, the phase prediction deviation performances significantly influence on the control performance. In some conditions, the phase prediction deviation will reduce the efficiency of the discrete control.

AB - © 2015, © 2014 Taylor & Francis. Oscillating-body converters are widely used in offshore engineering, to capture wave energies. In such a case, discrete control including both latching and declutching controls is adopted to improve the power capture performance of oscillating wave energy converters (WECs). A reliable prediction of wave excitation forces on the WEC is essential for the discrete control strategy. In this study, a time domain model is developed to calculate the hydrodynamic responses of a hemispherical oscillating WEC with discrete control in regular waves. A state space model is used to deal with the convolution term in the time domain equation, taking into account the memory effects of wave surface. Based on the developed numerical model, the effects of prediction deviations, such as the amplitude and phase of wave excitation force, have been studied. It is observed that the amplitude prediction deviation exhibits very few effects on the control performance. However, the phase prediction deviation performances significantly influence on the control performance. In some conditions, the phase prediction deviation will reduce the efficiency of the discrete control.

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