Ermakov, Andrei, Marie, Alice and Ringwood, John (2022) Optimal Control of Pitch and Rotational Velocity for a Cyclorotor Wave Energy Device. IEEE Transactions on Sustainable Energy, 13 (3). pp. 1631-1640. ISSN 1949-3029
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Abstract
The development of optimal control strategies for
cyclorotor wave energy converters (WECs) is at an early stage.
In this paper, we present new methods and solutions for optimal
pitch and/or rotational velocity control strategies for different
configurations of cyclorotor-based WECs, in both monochromatic
and panchromatic waves. The cyclorotor is modelled with the use
of an approximate two-dimensional mathematical model, where
hydrofoils are approximated as point source vortices in potential
waves. The goal of the developed control strategy is to determine
the optimal velocity profile, and/or pitch angle variations, for maximum energy conversion, in terms of generated mechanical shaft
power. The solutions, obtained with the use of spectral methods,
show a clear benefit in using a variable velocity for cyclorotors with
either one or two hydrofoils, in monochromatic waves, with a typical
increase in energy capture of 30-40%, while the optimal pitching
did not significantly increase the value of the absorbed wave energy.
We also present control results for panchromatic waves, assuming
all the properties of incoming wave packages, within a 10 s time
interval, are known. The obtained solutions have shown significant
benefit in joint optimal pitch and velocity control, especially in the
case of panchromatic waves. It has been also shown that successful
implementation of cyclorotor control strategies requires optimal
configuration of the static characteristics of the cyclorotor. In
conclusion, we discuss the optimal control benefits and highlight
problems which must be solved for further successful development
of these control strategies.
Item Type: | Article |
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Keywords: | Cyclorotor; LiftWEC; lift-based wave energy converter; optimal control; wave energy converter; |
Academic Unit: | Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research |
Item ID: | 16318 |
Identification Number: | 10.1109/TSTE.2022.3168508 |
Depositing User: | Professor John Ringwood |
Date Deposited: | 15 Jul 2022 08:45 |
Journal or Publication Title: | IEEE Transactions on Sustainable Energy |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Refereed: | Yes |
Related URLs: | |
URI: | https://mu.eprints-hosting.org/id/eprint/16318 |
Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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