Ringwood, John and Mérigaud, Alexis and Faedo, Nicolás and Fusco, Francesco (2018) Wave Energy Control Systems: Robustness Issues. IFAC-PapersOnLine, 51 (29). pp. 62-67. ISSN 2405-8963

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Abstract

While traditional feedback control systems enjoy relatively good sensitivity properties, energy maximising wave energy converter (WEC) control systems have particular characteristics which challenge the application of traditional feedback and robust control methods. In particular, the relationship between plant and controller is largely defined by the need to maximise power transfer, and the controller contains a feedforward component which is difficult to robustify. Typically, WEC control systems are based on linear model descriptions, but this belies the true nonlinearity of WEC hydrodynamics (particularly under controlled conditions) and the associated power take-off (PTO) system. This paper examines two popular WEC control structures and examines the sensitivity of these structures to parameter variations, both in terms of closed-loop transfer functions and power absorbed. Some recommendations are also given on which WEC parameters need to be modelled with high accuracy.

Item Type:	Article
Additional Information:	This work was supported by Science Foundation Ireland under Grant No. SFI/13/IA/1886 and Grant No. 12/RC/2302 for the Marine Renewable Ireland (MaREI) centre.
Keywords:	Wave energy; control system; sensitivity; robustness; power maximisation;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering
Item ID:	13120
Identification Number:	https://doi.org/10.1016/j.ifacol.2018.09.470
Depositing User:	Professor John Ringwood
Date Deposited:	20 Jul 2020 15:36
Journal or Publication Title:	IFAC-PapersOnLine
Publisher:	Elsevier
Refereed:	Yes
Funders:	Science Foundation Ireland (SFI)
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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