Technical and Economic Evaluation of a Community based Hybrid Power System
Author
Mrcela, Josip
Term
4. term
Education
Publication year
2021
Abstract
This thesis investigates a community-based, grid-connected hybrid power system in response to the growing role of distributed generation and renewables, and the need for clean, reliable, and economically viable operation. The aim is to provide a technical and economic evaluation with optimized scheduling to identify potential techno-economic benefits. The study models a distribution network hosting a hybrid plant composed of small hydropower and photovoltaic units (around 500 kW each), with an optional battery energy storage system (BESS). Methods include steady-state load flow and quasi-dynamic simulations (including OLTC voltage control) to assess voltages and power flows; formulation and solution of an optimization problem for day-ahead scheduling that compares a current pricing scheme against the day-ahead market and analyzes three cases (pricing scheme comparison, BESS in the day-ahead market, and the hybrid plant in the day-ahead market); and dynamic stability studies of frequency response using models of the hydro turbine, BESS, PV production, and load for scenarios with and without BESS. Based on these simulations, the work highlights system impacts, operational trade-offs, and potential benefits for plant owners, the local community, and the distribution system operator, offering insights into how coordinated control and market-aware scheduling can support secure and cost-effective operation of community hybrid systems.
Denne afhandling undersøger et community-baseret, nettilsluttet hybridkraftsystem som svar på voksende andele af distribueret produktion og vedvarende energi samt behovet for ren, pålidelig og økonomisk drift. Formålet er at gennemføre en teknisk og økonomisk evaluering med fokus på optimeret planlægning for at afdække potentielle techno-økonomiske gevinster. Studiet modellerer et distributionsnet med et hybridanlæg bestående af små vandkraft- og solcelleenheder (omkring 500 kW hver) og mulighed for batterienergilager (BESS). Metodisk udføres laststrøms- og kvasi-dynamiske simuleringer (inklusive OLTC-spændingskontrol) til vurdering af spændingsniveauer og energistrømme; der opstilles og løses et optimeringsproblem for day-ahead-planlægning, som sammenligner et aktuelt prisskema med day-ahead-markedet og analyserer tre cases (sammenligning af prisskemaer, BESS i day-ahead-markedet, og hybridanlæg i day-ahead-markedet); samt dynamiske stabilitetsstudier af frekvensrespons baseret på modeller af vandturbine, BESS, PV-produktion og last for scenarier med og uden BESS. På baggrund af disse simuleringer belyser arbejdet systempåvirkninger, driftsafvejninger og potentielle fordele for anlægsejer, lokalsamfund og netselskab og giver indsigt i, hvordan koordineret styring og markedsorienteret planlægning kan understøtte en sikker og økonomisk drift af community-baserede hybridsystemer.
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