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• W247206124 abstract "Ocean wave energy represents a signicant resource of renewable energy and can make animportant contribution to the development of a more sustainable solution in support of the contemporarysociety, which is becoming more and more energy intensive. A perspective is given onthe benefits that wave energy can introduce, in terms of variability of the power supply, whencombined with oshore wind.Despite its potential, however, the technology for the generation of electricity from ocean wavesis not mature yet. In order to raise the economic performance of Wave energy converters (WECs),still far from being competitive, a large scope exists for the improvement of their capacity factorthrough more intelligent control systems. Most control solutions proposed in the literature, forthe enhancement of the power absorption of WECs, are not implemented in practise becausethey require future knowledge of the wave elevation or wave excitation force. The non-causalityof the unconstrained optimal conditions, termed complex-conjugate control, for the maximumwave energy absorption of WECs consisting of oscillating systems, is analysed. A link betweenfundamental properties of the radiation of the floating body and the prediction horizon requiredfor an effective implementation of complex-conjugate control is identified.An extensive investigation of the problem of wave elevation and wave excitation force forecastingis then presented. The prediction is treated as a purely stochastic problem, where futurevalues of the wave elevation or wave excitation force are estimated from past measurements at thedevice location only. The correlation of ocean waves, in fact, allows the achievement of accuratepredictions for 1 or 2 wave periods into the future, with linear Autoregressive (AR) models. Arelationship between predictability of the excitation force and excitation properties of the floatingbody is also identified.Finally, a controller for an oscillating wave energy device is developed. Based on the assumptionthat the excitation force is a narrow-banded harmonic process, the controller is effectively tunedthrough a single parameter of immediate physical meaning, for performance and motion constrainthandling. The non-causality is removed by the parametrisation, the only input of the controllerbeing an on-line estimate of the frequency and amplitude of the excitation force. Simulations in(synthetic and real) irregular waves demonstrate that the solution allows the achievement of levelsof power capture that are very close to non-causal complex-conjugate control, in the unconstrainedcase, and Model predictive control (MPC), in the constrained case. In addition, the hierarchicalstructure of the proposed controller allows the treatment of the issue of robustness to modeluncertainties in quite a straightforward and effective way." @default.
• W247206124 created "2016-06-24" @default.
• W247206124 creator A5063888848 @default.
• W247206124 date "2012-07-01" @default.
• W247206124 modified "2023-09-27" @default.
• W247206124 title "Real-time Forecasting and Control forOscillating Wave Energy Devices" @default.
• W247206124 hasPublicationYear "2012" @default.
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