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Abstract

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.

Patent Number

10,197,040

Assignee

National Technology & Engineering Solutions of Sandia, LLC; Michigan Technological University; South Dakota Board of Regents

Application Number

15/466,605

Date Filed

3-22-2017

Certificate of Correction

No

Issue Date

2-5-2019

City

Albuquerque, NM; Houghton, MI; Pierre, SD

Disciplines

Engineering Mechanics | Mechanical Engineering

Optimal control of wave energy converters

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