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Preventing overvoltage in a distribution grid with large penetration of photovoltaic power
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group)ORCID iD: 0000-0001-6745-3635
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group)ORCID iD: 1-6586-4932
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2016 (English)In: Proceedings of the 6th International Workshop on Integration of Solar into Power Systems / [ed] Uta Betancourt / Thomas Ackermann, Darmstadt, Germany: Energynautics GmbH, 2016, 113-118 p.Conference paper, Abstract (Refereed)
Abstract [en]

Photovoltaic (PV) power generation is an important component in the future energy system. High penetration of PV power in a distribution power grid might however lead to overvoltage, i.e. +10% of rated voltage, for end-users. This study compares PV power curtailment and decentralized energy storage for overvoltage prevention in a 400V/10 kV distribution grid with large penetration of PV. LiDAR analysis is used to identify rooftops suitable for PV in a Swedish distribution grid with more than 5000 end-users. Results show that power curtailment allows 22% PV electricity (19 GWh) relative to total consumption on a yearly basis without overvoltage. PV production is reduced with 0.35 GWh due to curtailment. Decentralized energy storage of in total 86 MWh capacity achieves the same result.

Place, publisher, year, edition, pages
Darmstadt, Germany: Energynautics GmbH, 2016. 113-118 p.
Keyword [en]
Photovoltaics, distributed generation, energy storage, distribution grid, power curtailment
Keyword [sv]
Solel, distribuerad generation, energilagring, elnät
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-308821ISBN: 9783981654936OAI: oai:DiVA.org:uu-308821DiVA: diva2:1050924
Conference
6th International Workshop on Integration of Solar into Power Systems, Vienna, Austria, 14-15 November 2016
Projects
Småskalig solel i byggnader - kraft för förändring i energisystem och vardagslivetUtvärdering av tekniska lösningar för att hantera omfattande anslutning av solcellssystem i eldistributionsnät
Funder
Swedish Energy Agency, P37511-1Swedish Energy Agency, P40864-1
Available from: 2016-11-30 Created: 2016-11-30 Last updated: 2016-12-02
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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