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Optimal Control of Wave Energy Converters

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
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A wave energy converter and method for extracting energy from water waves maximizes the energy extraction per cycle by estimating an excitation force of heave wave motion on the buoy, computing a control force from the estimated excitation force using a dynamic model, and applying the computed control force to the buoy to extract energy from the heave wave motion. Analysis and numerical simulations demonstrate that the optimal control of a heave wave energy converter is, in general, in the form of a bang-singular-bang control; in which the optimal control at a given time can be either in the singular arc mode or in the bang-bang mode. The excitation force and its derivatives at the current time can be obtained through an estimator, for example, using measurements of pressures on the surface of the buoy in addition to measurements of the buoy position. A main advantage of this approximation method is the ease of obtaining accurate measurements for pressure on the buoy surface and for buoy position, compared to wave elevation measurements.
Abdelkhalik, Ossama (Houghton, MI), Robinett, III, Rush D. (Tijeras, NM), Zou, Shangyan (Houghton, MI), Bacelli, Giorgio (Albuquerque, NM), Wilson, David G. (Albuquerque, NM), Korde, Umesh (Hancock, MI)
15/ 466,605
March 22, 2017
STATEMENT OF GOVERNMENT INTEREST [0002] This invention was made with Government support under contract no. DE AC04-94AL85000 awarded by the U. S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.