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Energies 2016, 9(6), 475; doi:10.3390/en9060475

Coordinated Control of Wave Energy Converters Subject to Motion Constraints

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, the Ångström Laboratory, Uppsala University, P.O. Box 534, Uppsala 75 121, Sweden
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Academic Editor: John Ringwood
Received: 9 May 2016 / Revised: 13 June 2016 / Accepted: 14 June 2016 / Published: 21 June 2016
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Abstract

In this paper, a generic coordinated control method for wave energy converters is proposed, and the constraints on motion amplitudes and the hydrodynamic interaction between converters are considered. The objective of the control problem is to maximize the energy converted from ocean waves, and this is achieved by coordinating the power take-off (PTO) damping of each wave energy converter in the frequency domain in each sea state. In a case study, a wave energy farm consisting of four converters based on the concept developed by Uppsala University is studied. In the solution, motion constraints, including constraints on the amplitudes of displacement and velocity, are included. Twelve months of sea states, based on measured wave data at the Lysekil test site on the Swedish west coast, are used in the simulation to evaluate the performance of the wave energy farm using the new method. Results from the new coordinated control method and traditional control method are compared, indicating that the coordinated control of wave energy converters is an effective way to improve the energy production of wave energy farm in harmonic waves. View Full-Text
Keywords: wave energy farm; coordinated control; optimal damping; motion constraints; frequency domain wave energy farm; coordinated control; optimal damping; motion constraints; frequency domain
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Wang, L.; Engström, J.; Leijon, M.; Isberg, J. Coordinated Control of Wave Energy Converters Subject to Motion Constraints. Energies 2016, 9, 475.

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