A Remotely Controlled Sea Level Compensation System for Wave Energy Converters

Mohd Nasir Ayob, Valeria Castellucci, Johan Abrahamsson and Rafael Waters
Additional contact information
Mohd Nasir Ayob: Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Department of Engineering Sciences, The Angstrom Laboratory, P.O Box 534, SE-75121 Uppsala, Sweden
Valeria Castellucci: Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Department of Engineering Sciences, The Angstrom Laboratory, P.O Box 534, SE-75121 Uppsala, Sweden
Johan Abrahamsson: Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Department of Engineering Sciences, The Angstrom Laboratory, P.O Box 534, SE-75121 Uppsala, Sweden
Rafael Waters: Swedish Centre for Renewable Electric Energy Conversion, Division of Electricity, Department of Engineering Sciences, The Angstrom Laboratory, P.O Box 534, SE-75121 Uppsala, Sweden

Energies, 2019, vol. 12, issue 10, 1-16

Abstract: The working principle of the wave energy converter (WEC) developed at Uppsala University (UU) is based on a heaving point absorber with a linear generator. The generator is placed on the seafloor and is connected via a steel wire to a buoy floating on the surface of the sea. The generator produces optimal power when the translator's oscillations are centered with respect to the stator. However, due to the tides or other changes in sea level, the translator's oscillations may shift towards the upper or lower limit of the generator's stroke length, resulting in a limited stroke and a consequent reduction in power production. A compensator has been designed and developed in order to keep the generator's translator centered, thus compensating for sea level variations. This paper presents experimental tests of the compensator in a lab environment. The wire adjustments are based on online sea level data obtained from the Swedish Meteorological and Hydrological Institute (SMHI). The objective of the study was to evaluate and optimize the control and communication system of the device. As the device will be self-powered with solar and wave energy, the paper also includes estimations of the power consumption and a control strategy to minimize the energy requirements of the whole system. The application of the device in a location with high tides, such as Wave Hub, was analyzed based on offline tidal data. The results show that the compensator can minimize the negative effects of sea level variations on the power production at the WEC. Although the wave energy concept of UU is used in this study, the developed system is also applicable to other WECs for which the line length between seabed and surface needs to be adjusted.

Keywords: wave energy converter; tidal compensation; control system; tides; Wave Hub (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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