Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Energy Savings Using a Direct Current Distribution Network in a PV and Battery Equipped Residential Building
RISE Research Institutes of Sweden, Samhällsbyggnad, Energi och resurser. Chalmers University of Technology, Sweden.ORCID-id: 0000-0001-6060-5624
2020 (Engelska)Licentiatavhandling, monografi (Övrigt vetenskapligt)
Abstract [en]

Energy from solar photovoltaic (PV) are generated as direct current (DC) and almost all of today’s electrical loads in residential buildings, household appliances and HVAC system (Heating Ventilation and Air-conditioning) are operated on DC. For a conventional alternating current (AC) distribution system this requires the need for multiple conversion steps before the final user-stage. By switching the distribution system to DC, conversion steps between AC to DC can be avoided and, in that way, losses are reduced. Including a battery storage–the system’s losses can be reduced further and the generated PV energy is even better utilised.

This thesis investigates and quantifies the energy savings when using a direct current distribution topology in a residential building together with distributed energy generation from solar photovoltaic and a battery storage. Measured load and PV generation data for a single-family house situated in Borås, Sweden is used as a case study for the analysis. Detailed and dynamic models–based on laboratory measurements of the power electronic converters and the battery–are also used to more accurately reflect the system’s dynamic performance.

In this study a dynamic representation of the battery’s losses is presented which is based on laboratory measurements of the resistance and current dependency for a single lithium-ion cell based on Lithium iron phosphate (LFP). A comparative study is made with two others, commonly used, loss representations and evaluated with regards to the complete system’s performance, using the PV and load data from the single-family house. Results show that a detailed battery representation is important for a correct loss prediction when modelling the interaction between loads, PV and the battery.

Four DC system topologies are also modelled and compared to an equivalent AC topology using the experimental findings from the power electronic converters and the battery measurements. Results from the quasi-dynamic modelling show that the annual energy savings potential from the suggested DC topologies ranges between 1.9–5.6%. The DC topologies also increase the PV utilisation by up to 10 percentage points, by reducing the associated losses from the inverter and the battery conversion. Results also show that the grid-tied converter is the main loss contributor and when a constant grid-tied efficiency is used, the energy savings are overestimated.

Ort, förlag, år, upplaga, sidor
Göteborg: Chalmers Tekniska Högskola , 2020. , s. 101
Serie
Chalmers Thesis for Licentiate of Engineering 2020, ISSN 1403-266X
Nyckelord [en]
Direct-Current Distribution, Residential Buildings, Battery Energy Storage System, Battery Modeling, Solar Photovoltaic System, System Performance, Energy Efficiency, Energy Savings, PV Utilisation
Nationell ämneskategori
Annan elektroteknik och elektronik Husbyggnad Energiteknik Förnyelsebar bioenergi Energisystem
Identifikatorer
URN: urn:nbn:se:ri:diva-44775OAI: oai:DiVA.org:ri-44775DiVA, id: diva2:1427653
Presentation
2020-03-13, ED, Göteborg, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Energimyndigheten, 43276–1 och 47273–1Tillgänglig från: 2020-05-05 Skapad: 2020-04-30 Senast uppdaterad: 2023-06-02Bibliografiskt granskad

Open Access i DiVA

Licentiatavhandling__OLLAS(9812 kB)276 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 9812 kBChecksumma SHA-512
90c0b17dc2ca80367e471ca59b657ce82b59702b5e057edde1583a8f92ff97652c2c9dcf355e2e1b9693ae6f1d4e1e5cb18c892971a3ebea357bfeb4ee9e938f
Typ fulltextMimetyp application/pdf

Övriga länkar

https://research.chalmers.se/publication/515531

Person

Ollas, Patrik

Sök vidare i DiVA

Av författaren/redaktören
Ollas, Patrik
Av organisationen
Energi och resurser
Annan elektroteknik och elektronikHusbyggnadEnergiteknikFörnyelsebar bioenergiEnergisystem

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 276 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 375 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf