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Publikationer (10 of 16) Visa alla publikationer
Ollas, P., Thiringer, T., Persson, M. & Markusson, C. (2023). Battery loss prediction using various loss models: A case study for a residential building. Journal of Energy Storage, 70, Article ID 108048.
Öppna denna publikation i ny flik eller fönster >>Battery loss prediction using various loss models: A case study for a residential building
2023 (Engelska)Ingår i: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538, Vol. 70, artikel-id 108048Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This work compares and quantifies the annual losses for three battery system loss representations in a case study for a residential building with solar photovoltaic (PV). Two loss representations consider the varying operating conditions and use the measured performance of battery power electronic converters (PECs) but differ in using either a constant or current-dependent internal battery cell resistance. The third representation is load-independent and uses a (fixed) round trip efficiency. The work uses sub-hourly measurements of the load and PV profiles and includes the results from varying PV and battery size combinations. The results reveal an inadequacy of using a constant battery internal resistance and quantify the annual loss discrepancy to −38.6%, compared to a case with current-dependent internal resistance. The results also show the flaw of modelling the battery system’s efficiency with a fixed round trip efficiency, with loss discrepancy variation between −5 to 17% depending on the scenario. Furthermore, the necessity of accounting for the cell’s loss is highlighted, and its dependence on converter loading is quantified.

Nyckelord
Battery energy storage system, Lithium-ion batteries, Solar photovoltaic system, Battery performance, Applied research
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:ri:diva-65662 (URN)10.1016/j.est.2023.108048 (DOI)
Forskningsfinansiär
Energimyndigheten, 43276-1Energimyndigheten, 47273-1Energimyndigheten
Anmärkning

Funded by the Swedish Energy Agency (’’Energimyndigheten’’) through grant numbers: 43276-1 and 47273-1.

Tillgänglig från: 2023-07-12 Skapad: 2023-07-12 Senast uppdaterad: 2023-08-28Bibliografiskt granskad
Ollas, P., Thiringer, T., Persson, M. & Markusson, C. (2023). Energy Loss Savings Using Direct Current Distribution in a Residential Building with Solar Photovoltaic and Battery Storage. Energies, 16(3), Article ID 1131.
Öppna denna publikation i ny flik eller fönster >>Energy Loss Savings Using Direct Current Distribution in a Residential Building with Solar Photovoltaic and Battery Storage
2023 (Engelska)Ingår i: Energies, E-ISSN 1996-1073, Vol. 16, nr 3, artikel-id 1131Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
MDPI, 2023
Nyckelord
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
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:ri:diva-64102 (URN)10.3390/en16031131 (DOI)2-s2.0-85147846467 (Scopus ID)
Anmärkning

 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).

Tillgänglig från: 2023-02-28 Skapad: 2023-02-28 Senast uppdaterad: 2023-08-28Bibliografiskt granskad
Ollas, P., Thiringer, T., Chen, H. & Markusson, C. (2021). Increased photovoltaic utilisation from direct current distribution: Quantification of geographical location impact. Progress in Photovoltaics, 29(7), 846-856
Öppna denna publikation i ny flik eller fönster >>Increased photovoltaic utilisation from direct current distribution: Quantification of geographical location impact
2021 (Engelska)Ingår i: Progress in Photovoltaics, ISSN 1062-7995, E-ISSN 1099-159X, Vol. 29, nr 7, s. 846-856Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper, the performance of a direct current (DC) distribution system is modelled for a single-family residential building and compared with a conventional alternating current (AC) system to quantify the potential energy savings and gains in photovoltaic (PV) utilisation. The modelling is made for two different climates to quantify the impact of the geographical location. Results show that the system losses are reduced by 19–46% and the PV utilisation increased by 3.9–7.4% when using a DC distribution system compared to an AC equivalent, resulting in system efficiency gains in the range of 1.3–8.8%. Furthermore, it is shown that the geographical location has some effect on the system's performance and PV utilisation, but most importantly, the grid interaction is paramount for the performance of the DC topology. © 2021 The Authors.

Ort, förlag, år, upplaga, sidor
John Wiley and Sons Ltd, 2021
Nyckelord
battery storage, direct current (DC), energy savings, photovoltaic, PV load correlation, residential building, Electric impedance measurement, Energy conservation, Potential energy, Alternating current, DC distribution system, Direct current distributions, Distribution systems, Geographical locations, System efficiency, System's performance, Location
Nationell ämneskategori
Energisystem
Identifikatorer
urn:nbn:se:ri:diva-52970 (URN)10.1002/pip.3407 (DOI)2-s2.0-85103655459 (Scopus ID)
Anmärkning

 Funding details: Energimyndigheten, 43276‐1, 47273‐1; Funding text 1: The authors would like to acknowledge the Swedish Energy Agency (‘Energimyndigheten’) who has funded this research through Grants 43276‐1 and 47273‐1.

Tillgänglig från: 2021-04-21 Skapad: 2021-04-21 Senast uppdaterad: 2023-06-02Bibliografiskt granskad
Ollas, P., Thiringer, T., Chen, H. & Markusson, C. (2020). Increased PV Utilisation from DC Distribution: Quantification of Geographical Impact. In: EU PVSEC Conference Proceedings: . Paper presented at 37th European Photovoltaic Solar Energy Conference and Exhibition (pp. 1432-1441).
Öppna denna publikation i ny flik eller fönster >>Increased PV Utilisation from DC Distribution: Quantification of Geographical Impact
2020 (Engelska)Ingår i: EU PVSEC Conference Proceedings, 2020, s. 1432-1441Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In this paper, the performance of a direct current (DC) distribution system is modelled and compared fora single-family residential building with a conventional alternating current (AC) system to quantify the potential energy savings and gains in PV utilization. The modelling is also made for two different climates to quantify the impact of the geographical location. Results show that the system losses are reduced by 19-46% and the PV utilization increased by 3.9-7.4% when using a DC distribution system compared to an AC equivalent, resulting in system efficiency gains in the range of 1.3-8.8%. Furthermore, it is shown that the geographical location has some effect on the system's performance and PV utilization, but most importantly the grid interaction is paramount for the performance of the DC topology.

Nyckelord
Photovoltaic, DC-DC-Converter, Grid Integration, Storage, System Performance
Nationell ämneskategori
Energiteknik Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:ri:diva-51866 (URN)10.4229/EUPVSEC20202020-5EO.2.3 (DOI)3-936338-73-6 (ISBN)
Konferens
37th European Photovoltaic Solar Energy Conference and Exhibition
Forskningsfinansiär
Energimyndigheten, 43276-1
Tillgänglig från: 2021-01-14 Skapad: 2021-01-14 Senast uppdaterad: 2023-06-02Bibliografiskt granskad
Ollas, P., Markusson, C., Eriksson, J., Chen, H., Lindahl, M. & Thiringer, T. (2020). Quasi-Dynamic Modelling of DC Operated Ground-Source Heat Pump. In: SINTEF Proceedings; 5: . Paper presented at Building Simulation 2020 Conference, Oslo (pp. 208-213). Oslo, 5
Öppna denna publikation i ny flik eller fönster >>Quasi-Dynamic Modelling of DC Operated Ground-Source Heat Pump
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2020 (Engelska)Ingår i: SINTEF Proceedings; 5, Oslo, 2020, Vol. 5, s. 208-213Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The performance of a conventional ground-source heat pump (GSHP) has been measured in the laboratory with alternating current (AC) and direct current(DC) operation using the standardised points fromEN14511:2018. The results from these measurements have been used to modify a variable speed heat pump model in IDA Indoor Climate and Energy (ICE) and the annual performance of AC and DC operation have been simulated for an entire year's operation at two geographical locations in Sweden. Results show that the energy savings with DC operation from laboratory measurements span between 1.4{5.2% and when simulating the performance for an entire year's operation, the energy savings vary between 2.5{3.4%. Furthermore, the energy savings from the simulations have been compared to the bin method described in EN14825:2018.

Ort, förlag, år, upplaga, sidor
Oslo: , 2020
Nyckelord
Heat pump, direct current, energy savings
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:ri:diva-51865 (URN)978-82-536-1679-7 (ISBN)
Konferens
Building Simulation 2020 Conference, Oslo
Forskningsfinansiär
Energimyndigheten, 43276-1
Tillgänglig från: 2021-01-14 Skapad: 2021-01-14 Senast uppdaterad: 2023-06-02Bibliografiskt granskad
Ollas, P., Persson, J., Markusson, C. & Alfadel, U. (2018). Impact of Battery Sizing on Self-Consumption, Self-Sufficiency and Peak Power Demand for a Low Energy Single-Family House with PV Production in Sweden. In: 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC: . Paper presented at 7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018, 10 June 2018 through 15 June 2018 (pp. 618-623). Institute of Electrical and Electronics Engineers Inc.
Öppna denna publikation i ny flik eller fönster >>Impact of Battery Sizing on Self-Consumption, Self-Sufficiency and Peak Power Demand for a Low Energy Single-Family House with PV Production in Sweden
2018 (Engelska)Ingår i: 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC, Institute of Electrical and Electronics Engineers Inc. , 2018, s. 618-623Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper simulates the impact of battery sizing for an actual nearly-zero energy (NZEB) single-family house with solar PV located in Boras, Sweden. Simulations are done,° using measurement data as an input, for three different battery dispatch algorithms with two different purposes; (i) peak power shaving and (ii) maximising system self-consumption (SC) and self-sufficiency (SS) of the solar PV. The results show that the optimal battery storage size for this single-family house, given its measured electrical loads and existing solar PV system is around 7.2 kWh. System self-consumption and self-sufficiency from generated solar PV increased with 24.3 percentage points compared to a reference case without battery. Furthermore, results show that increasing the battery size beyond 7.2 kWh only results in minor performance gains.

Ort, förlag, år, upplaga, sidor
Institute of Electrical and Electronics Engineers Inc., 2018
Nyckelord
battery sizing, dispatch algorithms, NZEB, optimisation, photovoltaic, self sufficiency, self-consumption, target zero, Digital storage, Energy conversion, Houses, Optimisations, Self- consumption, Electric batteries
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:ri:diva-37956 (URN)10.1109/PVSC.2018.8548275 (DOI)2-s2.0-85059917269 (Scopus ID)9781538685297 (ISBN)
Konferens
7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018, 10 June 2018 through 15 June 2018
Tillgänglig från: 2019-04-23 Skapad: 2019-04-23 Senast uppdaterad: 2023-06-02Bibliografiskt granskad
Ollas, P., Markusson, C., Persson, J. & Alfadel, U. (2018). Impact of Battery Sizing on Self-Consumption, Self-Sufficiency and PeakPower Demand for a Low Energy Single-Family House With PVProduction in Sweden. In: 7th World Conference on Photovoltaic Energy Conversion (WCPEC-7), June 10-15, 2018: . Paper presented at 7th World Conference on Photovoltaic Energy Conversion (WCPEC-7), June 10-15, 2018.
Öppna denna publikation i ny flik eller fönster >>Impact of Battery Sizing on Self-Consumption, Self-Sufficiency and PeakPower Demand for a Low Energy Single-Family House With PVProduction in Sweden
2018 (Engelska)Ingår i: 7th World Conference on Photovoltaic Energy Conversion (WCPEC-7), June 10-15, 2018, 2018Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper simulates the impact of battery sizingfor an actual nearly-zero energy (NZEB) single-family housewith solar PV located in Bor°as, Sweden. Simulations are done,using measurement data as an input, for three different batterydispatch algorithms with two different purposes; (i) peak powershaving and (ii) maximising system self-consumption (SC) andself-sufficiency (SS) of the solar PV. The results show that theoptimal battery storage size for this single-family house, givenits measured electrical loads and existing solar PV system isaround 7.2 kWh. System self-consumption and self-sufficiencyfrom generated solar PV increased with 24.3 percentage pointscompared to a reference case without battery. Furthermore,results show that increasing the battery size beyond 7.2 kWhonly results in minor performance gains.

Nyckelord
battery sizing, self-consumption, selfsufficiency, photovoltaic, NZEB, optimisation, dispatch algorithms, target zero
Nationell ämneskategori
Energisystem
Identifikatorer
urn:nbn:se:ri:diva-35089 (URN)
Konferens
7th World Conference on Photovoltaic Energy Conversion (WCPEC-7), June 10-15, 2018
Projekt
Från solel till användare med minsta möjliga förlust – en fullskaledemonstration
Forskningsfinansiär
Energimyndigheten
Tillgänglig från: 2018-08-28 Skapad: 2018-08-28 Senast uppdaterad: 2023-06-02Bibliografiskt granskad
Rolfsman, L., Markusson, C., Borgqvist, M. & Karlsson, P. (2014). Dörrar på öppna kyldiskar och anpassning av kylsystem i butik (ed.).
Öppna denna publikation i ny flik eller fönster >>Dörrar på öppna kyldiskar och anpassning av kylsystem i butik
2014 (Svenska)Rapport (Refereegranskat)
Serie
BeLIvs rapport BP04
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-5608 (URN)16465 (Lokalt ID)16465 (Arkivnummer)16465 (OAI)
Tillgänglig från: 2016-09-08 Skapad: 2016-09-08 Senast uppdaterad: 2023-05-10Bibliografiskt granskad
Fyhr, K., Markusson, C. & Rosell, L. (2014). Energieffektivare ventilation i butiker - återluft (ed.).
Öppna denna publikation i ny flik eller fönster >>Energieffektivare ventilation i butiker - återluft
2014 (Svenska)Rapport (Refereegranskat)
Förlag
s. 56
Serie
Belivsrapport, granskad.
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-5624 (URN)18846 (Lokalt ID)18846 (Arkivnummer)18846 (OAI)
Tillgänglig från: 2016-09-08 Skapad: 2016-09-08 Senast uppdaterad: 2023-05-10Bibliografiskt granskad
Ruud, S., Markusson, C., Nordén, J., Karlsson, H., Lindgren, M. & Ollas, P. (2013). Belysningen väg från el till rumstemperatur (ed.).
Öppna denna publikation i ny flik eller fönster >>Belysningen väg från el till rumstemperatur
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2013 (Svenska)Rapport (Refereegranskat)
Serie
SP Rapport, ISSN 0284-5172 ; 2013:56
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-5133 (URN)15590 (Lokalt ID)978-91-87461-43-9 (ISBN)15590 (Arkivnummer)15590 (OAI)
Tillgänglig från: 2016-09-07 Skapad: 2016-09-07 Senast uppdaterad: 2023-06-08Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0001-8253-7490

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