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Energies 2015, 8(7), 6528-6542; doi:10.3390/en8076528

Nonlinear Passive Control of a Wave Energy Converter Subject to Constraints in Irregular Waves

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, the Ångström Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala, Sweden
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Academic Editor: Jens Peter Kofoed
Received: 17 April 2015 / Revised: 2 June 2015 / Accepted: 18 June 2015 / Published: 29 June 2015
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Abstract

This paper investigates a passive control method of a point absorbing wave energy converter by considering the displacement and velocity constraints under irregular waves in the time domain. A linear generator is used as a power take-off unit, and the equivalent damping force is optimized to improve the power production of the wave energy converter. The results from nonlinear and linear passive control methods are compared, and indicate that the nonlinear passive control method leads to the excitation force in phase with the velocity of the converter that can significantly improve the energy production of the converter. View Full-Text
Keywords: wave energy converter; power take off; passive control; load control; irregular waves; time domain wave energy converter; power take off; passive control; load control; irregular waves; time domain
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, L.; Isberg, J. Nonlinear Passive Control of a Wave Energy Converter Subject to Constraints in Irregular Waves. Energies 2015, 8, 6528-6542.

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