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Development of a methodology to simulate simple mismatching in photovoltaic systems
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The currently available tools to simulate solar photovoltaic (PV) systems do not offer a reliable solution to simulate string or module level inverter systems with partial shading and modules with mismatching electrical characteristics. The available methodologies to simulate this satisfying require computational power that is not commonly available. To make it possible to simulate these kinds of systems a methodology based around the software “System Advisory Model” (SAM) is proposed. The methodology assumes that shading is binary, meaning a module can either be fully shaded or not shaded at all. Two different global IV curve models are presented and evaluated in comparison with a more detailed Matlab global IV model based on the one diode equivalent circuit. All these methodologies disregards the impact of the bypass diodes in the PV module and this is considered a significant error, which has to be quantified. It is proposed that this should be done by using the two-diode equivalent circuit instead of the one diode model. Finally the methodology is not concluded to be reliable until verified in comparison with real world data.

Abstract [sv]

De för närvarande tillgängliga simuleringsverktygen för solcellssystem erbjuder inte en tillförlitlig metod för simulering av delvis skuggade system eller system med moduler med olika elektriska egenskaper. De metoder som är tillgängliga för att simulera detta tillförlitligt kräver datorkraft som inte är allmäntillgänglig. För att göra det möjligt att simulera dessa typer av system föreslås en metod baserad kring programvaran "System Advisory Model" (SAM). Metoden utgår från antagandet att skuggning är binärt, vilket innebär att en modul kan antingen vara helt skuggad eller inte skuggad alls. Två olika globala IV-modeller presenteras och utvärderas i jämförelse med en detaljerad Matlab global IV-modell baserad på enkel-diods ekvivalenta kretsen. Denna metod bortser dock från effekterna av bypass-dioderna i PV-modulen och detta antas medföra betydande fel som måste kvantifieras, detta bör då göras med hjälp av två-diods ekvivalenta kretsen. Slutligen så kan metoden inte anses pålitlig förrän den har blivit verifierad med verkliga data.

Place, publisher, year, edition, pages
2015. , 43 p.
Keyword [en]
PV, simulation, shading, mismatching, SAM, micro inverters
Keyword [sv]
PV, simulering, skuggning, partiell skuggning
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168651OAI: oai:DiVA.org:kth-168651DiVA: diva2:817719
Subject / course
Energy Technology
Educational program
Master of Science - Sustainable Energy Engineering
Presentation
2015-05-19, 11:00 (English)
Supervisors
Examiners
Available from: 2015-10-15 Created: 2015-06-05 Last updated: 2015-10-15Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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Output format
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