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Electrical Networks of CorPower Wave Farms: Economic Assessment and Grid Integration Analysis of Voltage
KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

On the path towards the commercialisation of wave energy, there are still certaindevelopmental challenges to be tackled by industry and academia. One of these challengesis the grid integration of wave farms along with the development of the offshore electricalnetworks for the farms. These networks are distinct from those of offshore wind farms oncertain features – connection layouts, electrical interface equipment (subsea connectors),power ratings and cable lengths amongst many others. These differences apart from somechallenges unique to wave farms make the corresponding research attractive.CorPower Ocean AB has been developing a 250 𝑘𝑊 point-absorber type Wave EnergyConverter (WEC) and the thesis investigates the afore-mentioned challenges with a stagewiseanalysis of wave farms comprising the CorPower WECs. Prior research on electricalnetworks for CorPower WECs is limited and in this regard the objective is to gain apreliminary insight into the electrical architecture of a pre-commercial wave farm.Furthermore, the entire study is based at the wave test site of the European Marine EnergyCentre (EMEC).Analysis of network architecture and operational constraints resulted in 4 networkvariants for the farm ratings of 2 𝑀𝑊 and 10 𝑀𝑊. Three of the variants are applied to a2 𝑀𝑊 farm and are subjected to a varied analysis after which the standout variant is chosenfor subsequent modelling and analysis in the form of a 10 𝑀𝑊 farm. The comparativeanalysis includes an investigation into the capital expenditure (CAPEX), the associatedcost uncertainty, technology readiness level (TRL) of the electrical components andnetwork efficiency.Dynamic modelling and simulation of the networks is then performed on DIgSILENTPowerFactory to provide the network efficiency and voltage quality parameters includingstep voltage change, operational voltage limits and voltage flicker. The voltage quality ofthe modelled networks at the connection point are largely found to be compliant to theUK Distribution Code, applicable at the EMEC site. But, the same could not be said for theresults at some of the internal points of the electrical networks of the wave farms as thevoltage levels at certain terminals were found to be on the higher side.From the results of the thesis, a greater understanding of the compatibility of variants fora 2 𝑀𝑊 farm and 10 𝑀𝑊 farm of 250 𝑘𝑊 point-absorber WECs, has been obtained.Overall, it is believed that the thesis has contributed to the growing reservoir ofinformation on offshore electrical networks of wave farms and the corresponding gridintegration issues.

Abstract [sv]

PĂ„ vĂ€gen mot kommersialisering av vĂ„genergi finns det fortfarande vissautvecklingsutmaningar som mĂ„ste hanteras av industrin och akademin. En av dessautmaningar Ă€r grid integrationen av vĂ„g farmar tillsammans med utvecklingen av deoffshore elnĂ€ten för gĂ„rdarna . Dessa nĂ€tverk skiljer sig frĂ„n de vindkraftverk som finns pĂ„vissa omrĂ„den - anslutningslayouter, elektrisk grĂ€nssnittsutrustning (subsea-kontakter),effektvĂ€rden och kabellĂ€ngder bland mĂ„nga andra. Dessa skillnader förutom vissautmaningar som Ă€r unika för vĂ„g farmar gör att motsvarande forskning attraktiv.CorPower Ocean AB har utvecklat en punktabsorberande Wave Energy Converter (WEC)pĂ„ 250 𝑘𝑊 och avhandlingen studerar pĂ„ de ovan nĂ€mnda utmaningarna med en stegvisanalys av vĂ„g anlĂ€ggningar som omfattar CorPower WEC. Tidigare forskning pĂ„ elnĂ€t förCorPower WEC Ă€r begrĂ€nsad och mĂ„let Ă€r att fĂ„ en preliminĂ€r inblick i den elektriskaarkitekturen hos en kommande kommersiell vĂ„ggĂ„rd. Dessutom Ă€r hela studien baseradpĂ„ vĂ„gtestplatsen för European Marine Energy Center (EMEC).Analys av nĂ€tverksarkitektur och operativa begrĂ€nsningar resulterade i 4nĂ€tverksvarianter för gĂ„rdarna pĂ„ 2 MW och 10 𝑀𝑊. Tre av varianterna appliceras pĂ„ en2 𝑀𝑊 gĂ„rd och utsĂ€tts för en varierad analys varefter den utmĂ€rkbara varianten vĂ€ljs förefterföljande modellering och analys i form av en 10 𝑀𝑊 gĂ„rd. Den jĂ€mförande analyseninnefattar en undersökning av kapitalkostnaderna (CAPEX), associeradkostnadsosĂ€kerheten, teknologis mognadsgrad (TRL) för de elektriska komponenternaoch nĂ€tverkseffektiviteten.Dynamisk modellering och simulering av nĂ€tverket utförs sedan pĂ„ DIgSILENTPowerFactory för att tillhandahĂ„lla nĂ€tverkseffektivitet och spĂ€nningskvalitetsparametrarinklusive stegspĂ€nningsbyte, driftsspĂ€nningsgrĂ€nser och spĂ€nningsflimmer.SpĂ€nningskvaliteten hos nĂ€tverket vid anslutningspunkten Ă€r i stor utstrĂ€ckning befunnitatt överensstĂ€mma med den brittiska distributionskoden, som Ă€r tillĂ€mplig pĂ„ EMECplatsen.Detsamma kunde inte sĂ€gas om resultaten pĂ„ nĂ„gra av de inre punkterna ielnĂ€tens vĂ„g farmar, eftersom spĂ€nningsnivĂ„erna vid vissa terminaler befanns vara pĂ„ dethögre sidan.Av avhandlingens resultat har en större förstĂ„else erhĂ„llit för varianternas kompatibilitetför en 2 𝑀𝑊 gĂ„rd och 10 𝑀𝑊 gĂ„rd med 250 𝑘𝑊 punktabsorberande WEC. Generellt Ă€rdet troligt att avhandlingen har bidragit till den vĂ€xande information om offshore elnĂ€t avvĂ„g farmar och motsvarande grid integrationsfrĂ„gor.

Place, publisher, year, edition, pages
2017. , p. 120
Series
TRITA-EE, ISSN 1653-5146 ; 2017:162
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-221833OAI: oai:DiVA.org:kth-221833DiVA: diva2:1177850
External cooperation
Corpower Ocean
Available from: 2018-01-26 Created: 2018-01-26 Last updated: 2018-01-26Bibliographically approved

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