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Modelling of microgrid energy systems with concentrated solar power
KTH, School of Industrial Engineering and Management (ITM).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This master’s thesis presents the work performed during a four-month long internship at Azelio AB in Gothenburg. Energy performance models for common energy technologies in microgrid energy systems were developed and validated. The investigated technologies are traditional and bifacial PV modules, wind turbines, Li-ion battery energy storage systems and diesel generators.

Subsequently, they were utilised to simulate the energy supply of two remote communities in Queensland, Australia. Azelio’s CSP technology, which combines heliostats, thermal energy storage with phase change materials and Stirling engine, was introduced as well. By means of scenarios and key performance indicators, the possibility of disconnecting such towns from the local electricity distribution network was investigated. Both technical and economic aspects were analysed. This led to the conclusion that 10 MW CSP system would be sufficient to achieve grid independence if extra backup capacity, e.g. diesel generators, or demandside control strategies, are introduced.

Sensitivity analysis performed on the possibility of dividing the CSP park into two clusters, the smaller one being subject to a power threshold, was investigated as well. In terms of economic feasibility, off-grid systems resulted more expensive than maintaining the grid connection.

Abstract [sv]

Denna master’s uppsats presenterar alla resultat från examensarbetet hos Azelio AB i Göteborg. Energy performance models för de vanligaste energiteknologerna i microgrid energisystemen designades och validerades. De forskade energiteknologerna var traditionella och bifacial solpaneler, vindkraft, energilagring genom Liion batterier och dieselgeneratorer.

Modellerna användes för att simulera energiförsörjning av olika energisystem som representerar två isolerade byar i Queensland, Australia. Azelio’s CSP teknologi, som består av heliostater, värmenergilagring med phase change material och en Stirlingmotor, introducerades också. Genom att designa olika scenarier och key perfomance indicators, möjligheten att koppla av byarna ifrån det lokala kraftnätsystemet utforskades. Båda tekniska och ekonomiska synpunkter värderades. Det beslutades att 10 MW CSP kapacitet kan vara nog mycket för att nå energisjälvständighet om ytterligare backupkapacitet, t.ex. en dieselgenerator, eller demand side control strategies introducerades.

Känslighetsanalys utforskade möjligheten att dela CSP systemet i två olika delar, där den med lägre kapacitet kunde avkopplas för att undvika onödig energiförsörjning. Om ekonomiska utförbarhet, off-grid system verkade dyrare än sådana system där byarna var fortfarande kopplat till det lokala kraftnätet.

Place, publisher, year, edition, pages
2019. , p. 124
Series
TRITA-ITM-EX ; 2019:533
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-264345OAI: oai:DiVA.org:kth-264345DiVA, id: diva2:1373026
External cooperation
Azelio
Supervisors
Examiners
Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2019-11-26Bibliographically approved

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