Ermakov, Andrei and 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 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, while the real time 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 are known. The obtained solutions have shown significant benefit in joint optimal pitch and velocity control, especially in the case of panchromatic waves.

Item Type:	Article
Keywords:	Biological system modeling; Cyclorotor; Lift-Based Wave Energy Converter; LiftWEC; Mathematical models; Optimal Control; Optimal control; Rotors; Shafts; Torque; Wave energy conversion; Wave Energy Converter;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering
Item ID:	16598
Identification Number:	https://doi.org/10.1109/TSTE.2022.3168508
Depositing User:	Dr Andrei Ermakov
Date Deposited:	10 Oct 2022 09:19
Journal or Publication Title:	IEEE Transactions on Sustainable Energy
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
Refereed:	No
URI:	Publisher
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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