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Optimised power take-off configuration for wave energy converters

(2017)
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Abstract
The energy in the waves of seas and oceans has a huge energetic potential to contribute to the renewable energy production. One of the big challenges of the technology is the economic profitability. Therefore, research has been performed on the optimization of the system in the wave energy converter that converts the motion energy to electricity: the Power Take-Off system (PTO). On the one hand, efforts have been made to maximize the energy yield by optimizing the PTO; and on the other hand, the effect of the installed power on the annual energy yield has been investigated. Because maybe bigger is not always better? And is there an economic optimum to be found? What is clear, among other things, is that the efficiency across the entire operational range is essential because the wave energy conversion requires a very wide operational range from the PTO. The thesis proposes some methods to select the most interesting PTO configuration(s) using computer simulations. This can help developers as an input of a techno-economic analysis to choose the most cost-effective configuration for a targeted location. In addition to the simulation work, also a lab setup was designed and built as a test bench to test PTOs in an accessible lab environment with adjustable wave conditions. An interactive wave emulator applies the same loads as when the PTO would work in a wave energy converter at sea.
--- _Nederlands_ De golfenergie in de golven van zeeën en oceanen heeft een enorm energetisch potentieel om een belangrijke bijdrage te leveren aan de hernieuwbare elektriciteitsproductie. Een grote uitdaging ervan is de economische rendabiliteit. Daarom is onderzoek gedaan naar de optimalisatie van het systeem dat in de golfenergieconvertor de bewegingsenergie omzet naar elektriciteit: het ‘Power Take-Off’ systeem (PTO). Er is enerzijds getracht om de energieopbrengst te maximaliseren door de PTO te optimaliseren; anderzijds is het effect onderzocht van het geïnstalleerde vermogen op de jaarlijkse energieopbrengst. Want misschien is groter niet altijd beter? En is een economisch optimum te vinden? Wat o.a. alvast heel duidelijk is, is dat de efficiëntie over het gehele werkingsbereik essentieel is, doordat de golfenergieconversie een heel breed werkingsgebied vergt van de PTO. De thesis stelt enkele methodes voor om aan de hand van computersimulaties de interessantste PTO-configuratie(s) te selecteren. Dit kan ontwikkelaars helpen om met een technisch-economische analyse de rendabelste configuratie te kiezen voor een beoogde locatie. Naast het simulatiewerk werd ook een labo-opstelling ontworpen en gebouwd om PTO’s te testen in een bereikbare labo-omgeving met instelbare golfcondities. Een interactieve wave emulator legt dezelfde belastingen aan als wanneer de PTO in een golfenergieconvertor op zee zou werken.
Keywords
wave energy, PTO, power take-off, dimensioning, PTO configuration, PTO optimisation, efficiency map, iso eficiency contour, wave emulator, lab setup, PTO testing, point absorber, WEC, wave energy converter, installed power

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Citation

Please use this url to cite or link to this publication:

Chicago
De Koker, Kristof. 2017. “Optimised Power Take-off Configuration for Wave Energy Converters”. Ghent, Belgium: Ghent University. Faculty of Engineering and Architecture.
APA
De Koker, K. (2017). Optimised power take-off configuration for wave energy converters. Ghent University. Faculty of Engineering and Architecture, Ghent, Belgium.
Vancouver
1.
De Koker K. Optimised power take-off configuration for wave energy converters. [Ghent, Belgium]: Ghent University. Faculty of Engineering and Architecture; 2017.
MLA
De Koker, Kristof. “Optimised Power Take-off Configuration for Wave Energy Converters.” 2017 : n. pag. Print.
@phdthesis{8535201,
  abstract     = {The energy in the waves of seas and oceans has a huge energetic potential to contribute to the renewable energy production. One of the big challenges of the technology is the economic profitability. Therefore, research has been performed on the optimization of the system in the wave energy converter that converts the motion energy to electricity: the Power Take-Off system (PTO).

On the one hand, efforts have been made to maximize the energy yield by optimizing the PTO; and on the other hand, the effect of the installed power on the annual energy yield has been investigated. Because maybe bigger is not always better? And is there an economic optimum to be found? What is clear, among other things, is that the efficiency across the entire operational range is essential because the wave energy conversion requires a very wide operational range from the PTO.

The thesis proposes some methods to select the most interesting PTO configuration(s) using computer simulations. This can help developers as an input of a techno-economic analysis to choose the most cost-effective configuration for a targeted location.

In addition to the simulation work, also a lab setup was designed and built as a test bench to test PTOs in an accessible lab environment with adjustable wave conditions. An interactive wave emulator applies the same loads as when the PTO would work in a wave energy converter at sea.
},
  author       = {De Koker, Kristof},
  isbn         = {978-94-6355-050-5},
  keywords     = {wave energy,PTO,power take-off,dimensioning,PTO configuration,PTO optimisation,efficiency map,iso eficiency contour,wave emulator,lab setup,PTO testing,point absorber,WEC,wave energy converter,installed power},
  language     = {eng},
  pages        = {XXIX, 212},
  publisher    = {Ghent University. Faculty of Engineering and Architecture},
  school       = {Ghent University},
  title        = {Optimised power take-off configuration for wave energy converters},
  year         = {2017},
}