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Time series analysis-based adaptive tuning techniques for a heaving wave energy converter in irregular seas.

Yavuz, H. and Stallard, T. J. and McCabe, A. P. and Aggidis, George A. (2007) Time series analysis-based adaptive tuning techniques for a heaving wave energy converter in irregular seas. Proceedings of the IMechE Part A: Journal of Power and Energy, 221 (1). pp. 77-90. ISSN 0957-6509

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Abstract

The paper presents a time domain model of a heaving buoy wave-energy converter and investigates the tuning problem in irregular seas. The tuning issue is addressed by employing both fixed (passive) and adaptive (active) power-take-off settings. The fixed power-take-off tuning approach includes models based on tuning the device natural frequency to either the energy frequency or peak frequency of the sea-state or a weighted average of several peak frequencies. The adaptive tuning approaches employ a sliding discrete Fourier transform frequency analysis, or a time-series analysis of the measured wave elevation and device velocity to estimate a localized dominant wave frequency and hence calculate power-take-off settings. The paper presents details of these tuning techniques by discussing issues related to the modelling, simulation, and predicted power captures for each method. A comparative study of each method along with practical implications of the results and recommendations are also presented.

Item Type: Article
Journal or Publication Title: Proceedings of the IMechE Part A: Journal of Power and Energy
Additional Information: The paper compares techniques for adaptive tuning of a heaving-buoy wave energy converter to provide the best possible power capture from an irregular sea. It is clear, as for output no 2 above, that such techniques will be essential for economic capture of wave energy by point-absorber collectors. The paper demonstrates that an active controller gives significantly better performance than a passive one - this finding is very likely to be taken up in practical point-absorber wave-energy collectors. RAE_import_type : Journal article RAE_uoa_type : General Engineering
Uncontrolled Keywords: wave energy converters ; time-series parameter identification ; power-take-off tuning ; reactive control
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Departments: Faculty of Science and Technology > Engineering
ID Code: 2663
Deposited By: ep_importer
Deposited On: 27 Mar 2008 13:33
Refereed?: Yes
Published?: Published
Last Modified: 28 Oct 2014 13:41
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2663

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