Journal ArticleDOI
Energy maximising robust control for spectral and pseudospectral methods with application to wave energy systems
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The main aim of this study is to propose a novel framework where spectral and pseudospectral problems include some structured uncertainty, achieving robust optimal control designs guaranteeing the ‘best worst-case performance’.Abstract:
Spectral and Pseudospectral methods have been widely considered in diverse optimal control applications, usually where energy optimisation is required. Although such methods are a good way to ensur...read more
Citations
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Journal ArticleDOI
Wave energy control: status and perspectives 2020
TL;DR: In this paper, the progress made since the first wave energy control systems were suggested in the 1970s, and examines current outstanding challenges for the control community, and discusses the potential of wave energy to provide a carbon-free solution to the world's increasing appetite for energy.
Journal ArticleDOI
An Energy-Maximising Linear Time Invariant Controller (LiTe-Con) for Wave Energy Devices
TL;DR: A Linear Time Invariant (LTI) energy-maximising control strategy for Wave Energy Converters (WECs) is proposed, using the fundamental requirement of impedance-matching, to maximise the energy obtained under polychromatic wave excitation.
Journal ArticleDOI
Experimental Implementation and Validation of a Broadband LTI Energy-Maximizing Control Strategy for the Wavestar Device
Demián García-Violini,Yerai Peña-Sanchez,Nicolás Faedo,Christian Windt,Francesco Ferri,John V. Ringwood +5 more
TL;DR: The experimental validation of a linear time-invariant (LTI) energy-maximizing control strategy for wave energy converters (WECs), applied to a 1/20 scale Wavestar WEC is addressed, validating the LiTe-Con controller in a realistic real-time scenario.
Journal ArticleDOI
Data-driven control of a Pendulum Wave Energy Converter: A Gaussian Process Regression approach
TL;DR: In this article , a data-driven approach based on Gaussian Process Regression (GPR) metamodel is proposed to learn the control strategy to be applied in a wave energy converter.
Proceedings ArticleDOI
Robust Moment-Based Energy-Maximising Optimal Control of Wave Energy Converters
TL;DR: A moment-based framework to design robust energy-maximising optimal controllers for Wave Energy Converters (WECs) is introduced, providing a computationally efficient robust optimal control framework for WECs.
References
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Measurements of wind-wave growth and swell decay during the Joint North Sea Wave Project (JONSWAP)
Klaus Hasselmann,Tim P. Barnett,E. Bouws,H. Carlson,D.E. Cartwright,K. Enke,J. A. Ewing,H. Gienapp,Dieter E. Hasselmann,P. Kruseman,A. Meerburg,Peter Müller,D.J. Olbers,K. Richter,W. Sell,H. Walden +15 more
TL;DR: In this article, wave spectra were measured along a profile extending 160 kilometers into the North Sea westward from Sylt for a period of two weeks in 1968 and 1969, with particular emphasis on wave growth under stationary offshore wind conditions and the attenuation of swell in water of finite depth.
Journal ArticleDOI
Robust Convex Optimization
Aharon Ben-Tal,Arkadi Nemirovski +1 more
TL;DR: If U is an ellipsoidal uncertainty set, then for some of the most important generic convex optimization problems (linear programming, quadratically constrained programming, semidefinite programming and others) the corresponding robust convex program is either exactly, or approximately, a tractable problem which lends itself to efficientalgorithms such as polynomial time interior point methods.
The impulse response function and ship motions
TL;DR: In this article, two new representations of the usual equations of motion for an oscillating ship are given, one makes use of the impulse response function and depends only upon the system being linear.
Journal ArticleDOI
Ocean waves and oscillating systems : linear interactions including wave-energy extraction
TL;DR: In this paper, the authors describe the interaction between oscillations and waves, and describe the absorption of wave energy by oscillating bodies by wave-energy absorption by oscillated bodies, as well as wave interactions with oscillating water columns.
Journal ArticleDOI
A practical guide to robust optimization
TL;DR: The aim of this paper is to help practitioners to understand robust optimization and to successfully apply it in practice, and to use many small examples to illustrate the discussions.
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A critical comparison of model-predictive and pseudospectral control for wave energy devices
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