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Energy Loss Savings Using Direct Current Distribution in a Residential Building with Solar Photovoltaic and Battery Storage
RISE Research Institutes of Sweden, Built Environment, Energy and Resources. Chalmers University of Technology, Sweden.ORCID iD: 0000-0001-6060-5624
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.ORCID iD: 0000-0003-3608-5264
RISE Research Institutes of Sweden, Built Environment, Energy and Resources.ORCID iD: 0000-0001-8253-7490
2023 (English)In: Energies, E-ISSN 1996-1073, Vol. 16, no 3, article id 1131Article in journal (Refereed) Published
Abstract [en]

This work presents a comparison of alternating current (AC) and direct current (DC) distribution systems for a residential building equipped with solar photovoltaic (PV) generation and battery storage. Using measured PV and load data from a residential building in Sweden, the study evaluated the annual losses, PV utilization, and energy savings of the two topologies. The analysis considered the load-dependent efficiency characteristics of power electronic converters (PECs) and battery storage to account for variations in operating conditions. The results show that DC distribution, coupled with PV generation and battery storage, offered significant loss savings due to lower conversion losses than the AC case. Assuming fixed efficiency for conversion gave a 34% yearly loss discrepancy compared with the case of implementing load-dependent losses. The results also highlight the effect on annual system losses of adding PV and battery storage of varying sizes. A yearly loss reduction of 15.8% was achieved with DC operation for the studied residential building when adding PV and battery storage. Additionally, the analysis of daily and seasonal variations in performance revealed under what circumstances DC could outperform AC and how the magnitude of the savings could vary with time. © 2023 by the authors.

Place, publisher, year, edition, pages
MDPI , 2023. Vol. 16, no 3, article id 1131
Keywords [en]
battery storage, building energy system, direct current, energy savings, power electronic converter, solar photovoltaic, Digital storage, Electric batteries, Electric impedance measurement, Electric power distribution, Energy dissipation, Housing, Power converters, Power electronics, Solar concentrators, Solar power generation, Alternating current, Building energy systems, Direct current distributions, Direct-current, Energy-savings, Power electronics converters, Residential building, Solar photovoltaics, Energy conservation
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-64102DOI: 10.3390/en16031131Scopus ID: 2-s2.0-85147846467OAI: oai:DiVA.org:ri-64102DiVA, id: diva2:1740113
Note

 Correspondence Address: Ollas P, RISE, Sweden; email: patrik.ollas@ri.se; Funding details: Energimyndigheten, 43276–1, 50986–1; Funding text 1: The Swedish Energy Agency funded this research through the national project “From photovoltaic generation to end-users with minimum losses—a full-scale demonstration” (2018–2020, grant number 43276–1) and the national project “Flexibility and energy efficiency in buildings with PV and EV charging” (2020–2023, grant number 50986–1).

Available from: 2023-02-28 Created: 2023-02-28 Last updated: 2023-08-28Bibliographically approved

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Ollas, PatrikPersson, MattiasMarkusson, Caroline

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