Experimental Evaluation of a Causal Impedance Matching Controller for an Array of Two WECfarm Wave Energy Converters

Timothy Vervaet, Nicolas Quartier, Efrain Carpintero Moreno, Vasiliki Stratigaki, Peter Troch, Gael Verao Fernandez, Francesco Ferri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The principle of impedance matching (IM) can be applied to maximize power transfer between two oscillatory systems, being the ocean waves and the power take-off (PTO) of a wave energy converter (WEC) in this paper. The complex conjugate of the intrinsic impedance is approximated by a Proportional (P) and Proportional Integral (PI) IM controller in the peak wave frequency of the design sea state, equivalent to a resistive and reactive controller, respectively. These causal IM controllers are implemented in a MATLAB-Simulink real-time control environment and experimentally tested for an array of two WECfarm heaving point absorber WECs at the Aalborg University (AAU) wave basin for a selection of four sea states, characterized by JONSWAP wave spectra. Literature covers the experimental testing of the IM approach for single, isolated WECs. The research discussed in this paper is unique by applying for the first time the experimental testing of the IM approach on a WEC array, by taking the hydrodynamic interactions between the WECs, occurring through radiation and diffraction of waves, into account. System identification (SID) tests are performed to obtain an accurate dynamic model of the WEC array, in order to design the P and PI controller. The absorbed power and q interaction factor metric are used to quantify interaction effects in the two-WEC array.

Original languageEnglish (US)
Title of host publicationProceedings of the 33rd International Ocean and Polar Engineering Conference, 2023
EditorsJin S. Chung, Decheng Wan, Satoru Yamaguchi, Shiqiang Yan, Igor Buzin, Hiroyasu Kawai, Hua Liu, Ivana Kubat, Bor-Feng Peng, Ali Reza, Venkatachalam Sriram, Suak Ho Van
PublisherInternational Society of Offshore and Polar Engineers
Pages706-712
Number of pages7
ISBN (Print)9781880653807
StatePublished - 2023
Event33rd International Ocean and Polar Engineering Conference, ISOPE 2023 - Ottawa, Canada
Duration: Jun 19 2023Jun 23 2023

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference33rd International Ocean and Polar Engineering Conference, ISOPE 2023
Country/TerritoryCanada
CityOttawa
Period6/19/236/23/23

Keywords

  • heaving point absorber WEC
  • impedance matching (IM)
  • MATLAB-Simulink
  • physical modelling
  • system identification (SID)
  • wave energy converter (WEC)
  • WECfarm

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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