Bacelli, Giorgio and Ringwood, John (2014) Nonlinear optimal wave energy converter control with application to a ap-type device. Proceedings of the 19th IFAC World Congress.

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Abstract

Wave energy converters (WECs) require active control to maximise energy capture over a wide range of sea conditions, which is generally achieved by making the device resonate. The exaggerated device motion arising at resonance, however, may result in nonlinear effects that are ignored by the linear models that are typically employed. In particular, nonlinear viscous forces are significant for particular device types, such as hinged aps, which we take as a case study in this paper. The paper develops a general nonlinear WEC control methodology based on pseudospectral methods. The continuous time energy maximization problem is fully discretised (both state and control), and the optimal solution is obtained by solving the resulting finite dimensional optimization problem. By way of example, the nonlinear viscous damping for a hinged ap WEC is incorporate into the control model. It is shown that the ratio of energy captured to energy dissipated is significantly increased with the nonlinear controller, compared to the linear case.

Item Type:	Article
Keywords:	Nonlinear optimal; wave energy converter control; ap-type device;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
Item ID:	6781
Depositing User:	Professor John Ringwood
Date Deposited:	13 Jan 2016 15:42
Journal or Publication Title:	Proceedings of the 19th IFAC World Congress
Publisher:	IFAC
Refereed:	Yes
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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