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PV system layout for optimized self-consumption
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group (BEESG))ORCID iD: 0000-0001-6745-3635
Mälardalens högskola. (ABB AB, Corporate Research)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group (BEESG))
2014 (English)In: Proceedings of the 29th European Photovoltaic Solar Energy Conference, 2014Conference paper, Published paper (Other academic)
Abstract [en]

With decreasing subsidies for PV systems, increased self-consumption of PV electricity could improve the profitability of grid-connected residential PV systems. Self-consumption is in this paper defined as the share of the PV production consumed in a building on an hourly basis. With higher prices for buying than selling electricity, the revenue due to self-consumption is higher than the profit of selling electricity to the grid. The focus of this paper is the potential to increase the self-consumption with alternative PV system layouts, i.e. several different azimuth and tilt angles, called 3DPV. Hourly data from an existing PV system on a detached house outside Västerås, Sweden, combined with meteorological and spot price data of electricity has been used, all from 2011. The results of one-year simulations show increased self-consumption and decreased PV production with 3DPV compared to a south-oriented PV system. The revenue decreases with 3DPV when using historical hourly spot market data. However, there are other benefits with 3DPV such as decreased rated power of the inverter due to lower PV peak production.

Place, publisher, year, edition, pages
2014.
National Category
Energy Systems
Research subject
Engineering Science
Identifiers
URN: urn:nbn:se:uu:diva-234181OAI: oai:DiVA.org:uu-234181DiVA: diva2:755509
Conference
29th European Photovoltaic Solar Energy Conference (EU PVSEC), Amsterdam, The Netherlands, 22 - 26 September, 2014
Available from: 2014-10-14 Created: 2014-10-14 Last updated: 2017-10-31
In thesis
1. Improved Self-Consumption of Photovoltaic Electricity in Buildings: Storage, Curtailment and Grid Simulations
Open this publication in new window or tab >>Improved Self-Consumption of Photovoltaic Electricity in Buildings: Storage, Curtailment and Grid Simulations
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The global market for photovoltaics (PV) has increased rapidly: during 2014, 44 times more was installed than in 2004, partly due to a price reduction of 60-70% during the same time period. Economic support schemes that were needed to make PV competitive on the electricity market have gradually decreased and self-consumption of PV electricity is becoming more interesting internationally from an economic perspective.

This licentiate thesis investigates self-consumption of residential PV electricity and how more PV power can be allowed in and injected into a distribution grid. A model was developed for PV panels in various orientations and showed a better relative load matching with east-west-oriented compared to south-oriented PV panels. However, the yearly electricity production for the east-west-system decreased, which resulted in less self-consumed electricity. Alternatives for self-consumption of PV electricity and reduced feed-in power in a community of detached houses were investigated. The self-consumption increased more with shared batteries than with individual batteries with identical total storage capacity. A 50% reduction in feed-in power leads to losses below 10% due to PV power curtailment. Methodologies for overvoltage prevention in a distribution grid with a high share of PV power production were developed. Simulations with a case with 42% of the yearly electricity demand from PV showed promising results for preventing overvoltage using centralized battery storage and PV power curtailment.

These results show potential for increasing the self-consumption of residential PV electricity with storage and to reduce stress on a distribution grid with storage and power curtailment. Increased self-consumption with storage is however not profitable in Sweden today, and 42% of the electricity from PV is far more than the actual contribution of 0.06% to the total electricity production in Sweden in 2014.

Place, publisher, year, edition, pages
Uppsala: Institutionen för teknikvetenskaper, 2016. 71 p.
Keyword
Photovoltaics, Solar energy, Self-consumption, Grid integration, Distributed generation, Energy storage, Curtailment, Power system
National Category
Energy Engineering Energy Systems
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-284091 (URN)
Presentation
2016-05-20, 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2016-05-09 Created: 2016-04-14 Last updated: 2016-12-02Bibliographically approved

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Luthander, RasmusWidén, Joakim

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