Investigations of a wave energy system by applying reactive control using stochastic analysis of the wave state

Andrew Stephen Zurkinden, Lars Damkilde

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

The power production of a point absorber wave energy converter is optimized in irregular waves by means of a stochastic analysis of the wave process. The dynamic response is assumed to be a stationary random process with zero mean value. Based on the assumption that the control moment constrains the velocity of the oscillator to be in phase with the incoming wave moment, the damping coefficient is expressed by the autocovariance function of the stationary excitation process. The paper examines four different control strategies by means of numerical simulations in the time domain. The effects on the structural loads are analyzed and compared for the different control cases. The load distribution show that the reactive system has larger moment amplitudes than the passive controlled system. However, for mild and relatively short waves the difference of the loading distribution seems to be small while for larger and longer waves the amount of reactive power which is fed into the system is significant. The structural loads i.e. the mechanical control moment and the inertia due to the angular acceleration are therefore increased.
Original languageEnglish
Title of host publication10th ewtec 2013 European Wave and Tidal Energy Conference Series : Proceedings of the 10th European Wave and Tidal Energy Conference
EditorsPeter Frigaard, Jens Peter Kofoed, AbuBakr S. Bahaj, Lars Bergdahl, Alain Clément, Daniel Conley, Antonio F. O. Falcão, Cameron MacLeod Johnstone, Lucia Margheritini, Ian Masters, António José Sarmento, Diego Vicinanza
Number of pages9
Place of PublicationAalborg
PublisherTechnical Committee of the European Wave and Tidal Energy Conference
Publication date2013
Publication statusPublished - 2013
EventEuropean Wave and Tidal Energy Conference - Aalborg, Denmark
Duration: 2 Sep 20135 Sep 2013
Conference number: 10

Conference

ConferenceEuropean Wave and Tidal Energy Conference
Number10
CountryDenmark
CityAalborg
Period02/09/201305/09/2013
SeriesEuropean Wave and Tidal Energy Conference Series
Number10

Bibliographical note

The proceedings is published on a usb.

Keywords

  • Wave energy system
  • Reactive control
  • Stochastic analysis
  • Wave conditions

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