Next Article in Journal
Fuzzy Controller for a Voltage-Regulated Solar-Powered MPPT System for Hybrid Power System Applications
Next Article in Special Issue
Computational Fluid Dynamics and Visualisation of Coastal Flows in Tidal Channels Supporting Ocean Energy Development
Previous Article in Journal
Life-Cycle Energy and GHG Emissions of Forest Biomass Harvest and Transport for Biofuel Production in Michigan
Previous Article in Special Issue
Influence of Model Simplifications Excitation Force in Surge for a Floating Foundation for Offshore Wind Turbines
Article Menu

Export Article

Open AccessArticle

Nearshore Tests of the Tidal Compensation System for Point-Absorbing Wave Energy Converters

Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, Box 534, Uppsala 751 21, Sweden
Author to whom correspondence should be addressed.
Academic Editor: Ringwood John
Energies 2015, 8(4), 3272-3291;
Received: 16 February 2015 / Revised: 1 April 2015 / Accepted: 3 April 2015 / Published: 22 April 2015
(This article belongs to the Special Issue Tools and Techniques for Economic Delivery of Ocean Energy)
PDF [19114 KB, uploaded 22 April 2015]


The power production of the linear generator wave energy converter developed at Uppsala University is affected by variations of mean sea level. The reason is that these variations change the distance between the point absorber located on the surface and the linear generator located on the seabed. This shifts the average position of the translator with respect to the center of the stator, thereby reducing the generator output power. A device mounted on the point absorber that compensates for tides of small range by regulating the length of the connection line between the buoy at the surface and the linear generator has been constructed and tested. This paper describes the electro-mechanical, measurement, communication and control systems installed on the buoy and shows the results obtained before its connection to the generator. The adjustment of the line was achieved through a linear actuator, which shortens the line during low tides and vice versa. The motor that drives the mechanical device was activated remotely via SMS. The measurement system that was mounted on the buoy consisted of current and voltage sensors, accelerometers, strain gauges and inductive and laser sensors. The data collected were transferred via Internet to a Dropbox server. As described within the paper, after the calibration of the sensors, the buoy was assembled and tested in the waters of Lysekil harbor, a few kilometers from the Uppsala University research site. Moreover, the performance of the sensors, the motion of the mechanical device, the power consumption, the current control strategy and the communication system are discussed. View Full-Text
Keywords: wave energy; tidal compensation; nearshore tests; measurement technique wave energy; tidal compensation; nearshore tests; measurement technique
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).

Share & Cite This Article

MDPI and ACS Style

Castellucci, V.; Abrahamsson, J.; Kamf, T.; Waters, R. Nearshore Tests of the Tidal Compensation System for Point-Absorbing Wave Energy Converters. Energies 2015, 8, 3272-3291.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top