Integration of Large Capacity PV Power and Measuring PV Hosting Capacity of North Cyprus MV Grid
Author
Celiloglu, Rifat
Term
4. term
Education
Publication year
2017
Submitted on
2017-06-01
Pages
59
Abstract
This thesis develops a methodology to determine the photovoltaic (PV) hosting capacity of medium-voltage (MV) distribution substations in North Cyprus, supporting a plan to integrate 30 MW of PV distributed across the grid. Using operational and asset data from the local utility (KIB-TEK), a network simulation model was built and a representative substation was studied under steady-state conditions at both minimum and maximum load, while PV injections were increased in 0.5 pu steps. The maximum permissible PV connection was assessed against transformer loading, line loading, and voltage deviation limits. The analyses indicate that transformer loading is typically the main bottleneck, with line capacities and voltage levels also constraining integration. A voltage control approach using reactive power support at MV nodes was tested to improve voltage profiles; improvements were observed when absorbing appropriate reactive power, and the effectiveness depends on where along the feeder the support is initiated. Two deployment strategies were compared, with the most effective being to start support at feeder ends and proceed toward the MV bus. The findings provide a practical basis for planning distributed PV integration in the North Cyprus MV grid.
Dette projekt udvikler en metode til at fastlægge, hvor meget solcelleproduktion (PV) mellemspændingsstationer i Nordcyperns elnet kan optage (hostingkapacitet), som grundlag for en planlagt integration af 30 MW PV fordelt i hele nettet. På baggrund af drifts- og anlægsdata fra det lokale elselskab (KIB-TEK) er der opbygget en simuleringsmodel af nettet, og en repræsentativ transformerstation er analyseret i stationær tilstand ved både minimums- og maksimumsbelastning, mens PV-indfødning trinvist øges i intervaller på 0,5 pu. For at bestemme den maksimalt tilladelige PV-tilslutning vurderes grænser for transformatorbelastning, linjebelastning og spændingsafvigelser. Analyserne viser, at transformatorernes belastning typisk er den primære begrænsning, mens ledningskapacitet og spændingsniveauer også kan være kritiske. En spændingsstyringsmetode baseret på reaktiv effektstøtte er afprøvet på MV-knudepunkter for at forbedre spændingsprofilerne; der ses forbedringer ved at absorbere passende mængder reaktiv effekt, og effekten afhænger af, hvor i føderen støtten påbegyndes. To strategier sammenlignes, og det er mest effektivt at starte støtten ved føderens endepunkter og fortsætte ind mod MV-samleskinnen. Resultaterne giver et praktisk grundlag for planlægning af distribueret PV-integration i Nordcyperns MV-net.
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