Semi-active feedforward control of a floating OWC point absorber for optimal power take-off

Tao Sun, Søren R. K. Nielsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

1 Citationer (Scopus)
80 Downloads (Pure)


The performance of a floating oscillating water column wave energy converter depends on the variation of the pressure above atmospheric pressure in the pressure chamber above the water column. The pressure can be semi-actively controlled by the opening and closure of a valve between the pressure chamber and the generator. In this paper, a control is suggested, where the closure time intervals of the valve are taken as a fixed fraction of the peak period of a given sea state. The control relies on an estimation of the external wave loads, which, in turn, depend on the prediction of the future surface elevation in a given prediction interval, for which reason it is classified as a feedforward (open-loop) control strategy. A Kalman-Bucy filter has been devised for the indicated prediction. The optimal fraction of time of the sub-optimal controller with a closed valve is determined by comparison with the performance of the optimal control obtained by nonlinear programming. For a given sea state, it is demonstrated that the reduced performance of the sub-optimal controller is primarily related to the estimation error of the wave loads.

TidsskriftIEEE Transactions on Sustainable Energy
Udgave nummer3
Sider (fra-til)1300-1308
Antal sider9
StatusUdgivet - 2020


  • Wave Energy
  • Oscillating water column
  • Heave absorber
  • semi-active control
  • Feedforward control

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    Sun, T., Nielsen, S. R. K., Kofoed, J. P. & Lopez, M. D. P. H.


    Projekter: ProjektForskning