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

Andrew Stephen Zurkinden, Lars Damkilde

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Abstrakt

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.
OriginalsprogEngelsk
Titel10th ewtec 2013 European Wave and Tidal Energy Conference Series : Proceedings of the 10th European Wave and Tidal Energy Conference
RedaktørerPeter 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
Antal sider9
UdgivelsesstedAalborg
ForlagTechnical Committee of the European Wave and Tidal Energy Conference
Publikationsdato2013
StatusUdgivet - 2013
BegivenhedEuropean Wave and Tidal Energy Conference - Aalborg, Danmark
Varighed: 2 sep. 20135 sep. 2013
Konferencens nummer: 10

Konference

KonferenceEuropean Wave and Tidal Energy Conference
Nummer10
LandDanmark
ByAalborg
Periode02/09/201305/09/2013
NavnEuropean Wave and Tidal Energy Conference Series
Nummer10

Bibliografisk note

The proceedings is published on a usb.

Emneord

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

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