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Design and layout of power conversion chain for a wave energy converter
KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Wave energy has the potential to provide an energy resource in this challenging energyenvironment. Wave energy converters are devices used to extract this energy and convertit into electricity. Wave Carpet is an example of such a novel wave energy converters andin its final form, it consists of a submerged membrane which covers an arbitrarily largearea above the sea floor. Incident waves create a pressure difference between the upper andlower surfaces, which triggers an up-and-down movement. The power take-off attached tothe surfaces serve to restrict this movement and thereby extract hydraulic power which isconverted to electricity.The Wave Carpet, is a type of wave energy converter that is beingdeveloped at University of California Berkeley′s Theoretical and Applied Fluid DynamicsLaboratory (TAFLab).The thesis aims at modeling and designing the different power conversion chainof the entire wave energy converter device. The process of energy conversion that yieldsthe required electrical energy for connecting a wave energy converter to an electricalnetwork is termed as the power conversion chain. A detailed electro-mechanical modelof the wave energy converter system connected to power grid is developed in theMatlab/SIMULINK environment and its corresponding generator and hydraulic controlstructure is implemented. The simulation response of the wave energy converter alongwith the power conversion chain is investigated.

Abstract [sv]

Vågenergi har potential att bli en energiresurs i en utmanande energimiljö. Vågkraftverkär maskiner som används till att utvinna denna energi och omvandla den till elektricitet.Wave Carpet är ett exempel på ett vågkraftverk som i sitt slutglitiga stadie bestårav ett nedsänkt membran som täcker ett godtyckligt stort område ovanför sjöbotten.Inkommande vågor skapar en tryckskillnad mellan den övre och nedre ytan som gerupphov till en lodrätt rörelse. De mekaniska armarna kopplade till membranet bromsardenna rörelse och kan genom hydraulik omvandla bromsenergin till elektricitet. The WaveCarpet är en typ av vågkraftverk som utvecklas vid University of California Berkeley′sTheoretical and Applied Fluid Dynamics Laboratory (TAFLab).Uppsatsen syftar till att modellera och designa effektomvandlingskedjan i ett sådantvågkraftverk. Energiomvandlings processen som ger upphov till elektriciteten via ettvågkraftverk är benämnt som effektomvandlingskedjan. En detaljerad elektro-mekaniskmodell över ett vågkraftverksystem kopplat till ett elnät med motsvarande generator ochhydraliska regulatorer är utvecklad i Matlab/Simulink miljön. Simuleringsresultaten fråndet modellerade vågkraftverket undersöks tillsammans med effektomvandlingskedjan.

Place, publisher, year, edition, pages
2017. , p. 80
Series
TRITA-EE, ISSN 1653-5146 ; 2017:006
Keywords [en]
Permanent-magnet synchronous generator, Power conversion chain, Power take off, SimHydraulics, Wave energy converter, Wave energy
Keywords [sv]
Permanentmagnet synkrongenerator, Effektomvandlingskedjan, Kraftuttag, SimHydraulics, Vågenergiomvandlaren, Vågenergi
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-202403OAI: oai:DiVA.org:kth-202403DiVA, id: diva2:1076681
External cooperation
Callwave
Educational program
Master of Science - Electric Power Engineering
Available from: 2017-02-23 Created: 2017-02-23 Last updated: 2017-02-23Bibliographically approved

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