Title: Multi-resonant feedback control of a single degree-of-freedom wave energy converter

Abstract

A multi-resonant wide band controller decomposes the wave energy converter control problem into sub-problems; an independent single-frequency controller is used for each sub-problem. Thus, each sub-problem controller can be optimized independently. The feedback control enables actual time-domain realization of multi-frequency complex conjugate control. The feedback strategy requires only measurements of the buoy position and velocity. No knowledge of excitation force, wave measurements, nor wave prediction is needed. As an example, the feedback signal processing can be carried out using Fast Fourier Transform with Hanning windows and optimization of amplitudes and phases. Given that the output signal is decomposed into individual frequencies, the implementation of the control is very simple, yet generates energy similar to the complex conjugate control.

Inventors:

Wilson, David G.; Robinett, III, Rush D.; Abdelkhalik, Ossama; Song, Jiajun; Bacelli, Giorgio

Issue Date:

2019-09-24

Research Org.:

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Michigan Technological Univ., Houghton, MI (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1576282

Patent Number(s):

10423126

Application Number:

15/830,752

Assignee:

National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM); Michigan Technological University (Houghton, MI)

Patent Classifications (CPCs):

F - MECHANICAL ENGINEERING F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04 F05B - INDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY

G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

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F - MECHANICAL ENGINEERING F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04 F05B - INDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY

F05B2270/20 - to optimise the performance of a machine

G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

G06F17/142 - {Fast Fourier transforms, e.g. using a Cooley-Tukey type algorithm}

F - MECHANICAL ENGINEERING F03 - MACHINES OR ENGINES FOR LIQUIDS F03B - MACHINES OR ENGINES FOR LIQUIDS

F03B13/22 - using the flow of water resulting from wave movements to drive a motor or turbine {

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

Y02E10/30 - Energy from the sea

F - MECHANICAL ENGINEERING F03 - MACHINES OR ENGINES FOR LIQUIDS F03B - MACHINES OR ENGINES FOR LIQUIDS

F03B15/00 - Controlling

G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL

G05B11/38 - for obtaining a proportional characteristic

F - MECHANICAL ENGINEERING F03 - MACHINES OR ENGINES FOR LIQUIDS F03B - MACHINES OR ENGINES FOR LIQUIDS

F03B13/16 - using the relative movement between a wave-operated member, {i.e. a "wom"} and another member, {i.e. a reaction member or "rem"}

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DOE Contract Number:  

NA0003525

Resource Type:

Patent

Resource Relation:

Patent File Date: 2017 Dec 04

Country of Publication:

United States

Language:

English