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Reliability Evaluation of Distribution Systems Considering Failure Modes and Network Configuration
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (RCAM)ORCID iD: 0000-0003-4021-839X
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Power distribution networks are recognized as the constituent part of power systems with the highest concentration of failure events. Even though the faults in distribution networks have a local effect when compared to the generation and transmission sides, major contingency escalation events are being more frequently reported from this section. The various aspects regarding the reliability and performance of distribution networks are identified as an important topic. Integration of new technologies, automation and increased penetration of distributed generation is expected to make improving and even sustaining high reliability standards a complex task.

 

This thesis presents developed approaches to quantify and analyze the complex correlated failure probabilities of different failure modes in distribution networks. A theoretical simulation model that relates to real world data to measure false tripping probabilities is developed and tested. More simplified approaches that utilities can exercise with readily available data in fault registers are also established.  Optimal configurations that could improve system performance and respective investment costs are analyzed and savings in system reliability at the cost of grid investments are modelled. The optimization helps in prioritizing the most critical investments by considering the system impact of reconfigurations focusing on meeting customer demands and respecting transfer capacities of weak links. The value of existing networks and willingness of the grid owner in investing can be integrated into suggestive alterations to assist decision making in planning and maintenance allocation.

 

The thesis makes both system specific and generalizable observations from detailed data collection from power utilities. The observations and results have potential in aiding future research by giving important understanding of the reliability impacts of network structures and of control and protection equipment.

Abstract [sv]

Eldistributionsnätet är den del av elnäten som leder till flest kundarbrott trots att felhändelserna oftast är mycket lokala jämfört med händelse på genererings och transmissions sidan. Alltså identifieras de olika aspekterna beträffande pålitlighet och prestanda för distributionssystem som viktiga ämnen. Integration av ny teknik, automatisering och ökad penetration av distribuerad produktion förväntas göra förbättringar och rent av upprätthållande av höga tillförlitlighetskrav till en komplex uppgift.

 

Denna avhandling presenterar metoder för att kvantifiera och analysera de komplexa och korrelerade sannolikheterna för olika fellägen i distributionsnätet. En teoretisk simuleringsmodell baserrad på verkliga data för att mäta sannolikheter för felaktiga brytarkommandon utvecklas och testas. Mer förenklade tillvägagångssätt där elnätsföretag kan använda lättillgängliga data i felregister presenteras också. Optimala konfigurationer som kan förbättra systemprestandan och investeringskostnader analyseras och minskningar i systemets tillförlitlighet genom minskade kostnader för nätinvesteringar modelleras. Optimeringen bidrar till att prioritera kritiska investeringar genom att påvisa systemets inverkan av omkonfigurationer. Optimeringen tär hänsyn till kundernas krav och att bevara överföringsförmågan hos svaga länkar. Värdet av befintliga nät och villigheten hos nätägaren att investera kan undersökas som förslag, till ändringar, som stöd detta för beslut om planering och underhåll.

 

Avhandlingen gör både systemspecifika och generaliserbara observationer från en detaljerad datainsamling från elnätägare. Observationerna och resultaten har potential att hjälpa framtida forskning genom att ge en viktig förståelse för tillförlitlighetseffekter från nätverksstrukturen och från kontroll- och skyddsutrustning.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. , p. 47
Series
TRITA-EE, ISSN 1653-5146 ; 2017:138
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-215115ISBN: 978-91-7729-552-5 (print)OAI: oai:DiVA.org:kth-215115DiVA, id: diva2:1146353
Public defence
2017-10-24, Kollegiesalen, Brinellvägen 8, Kungl. Tekniska högskolan, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20171004

Available from: 2017-10-04 Created: 2017-10-02 Last updated: 2017-10-04Bibliographically approved
List of papers
1. On the status of reliability studies involving primary and secondary equipment applied to power system
Open this publication in new window or tab >>On the status of reliability studies involving primary and secondary equipment applied to power system
2014 (English)In: 2014 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2014 - Conference Proceedings, IEEE , 2014, p. 6960653-Conference paper, Published paper (Refereed)
Abstract [en]

Growth in infrastructure and energy utilization consistently put forward the demand for added quality and quantity of electric power. Reliability concerns over power systems are widespread within its different associated divisions like 'primary' power system structure, protection system, control equipment, ICT (Information and Communication Technologies) etc. This paper is a review of the present status of practices regarding reliability analysis in these divisions and works towards collectively assessing some of the studies in the respective areas. The idea of integrating reliability analysis from the above areas is introduced along with pointing out the major challenges associated. A set of tools for operators to make use in these reliability evaluations and modelling are mentioned. The earlier attempts towards combined overall system reliability analysis are discussed and the approach in this regard with the help of 'control functions' is emphasised. The paper includes works dealing with theory, different methodologies and data associated with power system reliability.

Place, publisher, year, edition, pages
IEEE, 2014
Keyword
power system control, power system reliability, powr system modeling, protection system reliability, substation automation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-157937 (URN)10.1109/PMAPS.2014.6960653 (DOI)000358734100076 ()2-s2.0-84916205907 (Scopus ID)978-147993561-1 (ISBN)
Conference
2014 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2014, 7 July 2014 through 10 July 2014, Durham, United Kingdom
Note

QC 20141222

Available from: 2014-12-22 Created: 2014-12-18 Last updated: 2017-10-02Bibliographically approved
2. Analysing Correlated Events in Power System Using Fault Statistics
Open this publication in new window or tab >>Analysing Correlated Events in Power System Using Fault Statistics
2016 (English)In: Probabilistic Methods Applied to Power Systems (PMAPS), 2016 International Conference on, IEEE, 2016Conference paper, Published paper (Other academic)
Abstract [en]

Power system automation requires logical presumptions made on practical grids to correctly comprehend and manage complex and correlated faults occurring in real world systems. Traditional grid fault analysis methods lack in-depth understanding of these complex events and demand development of approaches that make use of available data to address this problem. Here, the traditional classification approach and challenges relating control equipment in power system are reviewed and a method observing the affected customers during faults along with grid design is discussed based on Swedish case study data. Various contrasting observations are made on the data recorded over two time periods to understand the trend developing over years. Moreover, it will be shown that the classification method also has potential in identifying weak spots in the grid when it comes to the reliability of control equipment.

Place, publisher, year, edition, pages
IEEE, 2016
Keyword
fault statistics, Power system reliability, control equipment, protection system reliability, correlated events
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-201700 (URN)10.1109/PMAPS.2016.7764207 (DOI)000392327900158 ()2-s2.0-85015245484 (Scopus ID)978-1-5090-1970-0 (ISBN)
Conference
Probabilistic Methods Applied to Power Systems (PMAPS), 2016, Beijing, China
Note

QC 20170220

Available from: 2017-02-14 Created: 2017-02-14 Last updated: 2017-10-02Bibliographically approved
3. Reliability Evaluation of Distribution Structures Considering the Presence of False Trips
Open this publication in new window or tab >>Reliability Evaluation of Distribution Structures Considering the Presence of False Trips
2016 (English)In: IEEE Transactions on Smart Grid, ISSN 1949-3053, E-ISSN 1949-3061Article in journal (Other academic) Published
Abstract [en]

This paper presents a method for modelling the different modes of failures in a substation and feeder architecture along with updating the possible false tripping scenarios in it. A traditional approach to collectively assess the failure modes using reliability block diagram is reviewed, and the method is updated to count in the unaccounted false tripping scenarios. A generalizable radial feeder branching structure is adopted and the effect of total feeder length and number of feeders from each busbar is examined and modelled with the help of the updated reliability block diagram. The modelled trends are also studied from real-world substation architectures. Thus, the analysis attains an improved estimation of the complex hidden failure probabilities combining theoretical and practical models.

Place, publisher, year, edition, pages
IEEE, 2016
Keyword
substation protection, Circuit breakers, control equipment, failure rate modelling, power distribution faults, power system control, power system reliability
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-174183 (URN)10.1109/TSG.2016.2609684 (DOI)000430715400066 ()2-s2.0-84992090869 (Scopus ID)
Note

QC 20170220

Available from: 2015-10-01 Created: 2015-10-01 Last updated: 2018-05-15Bibliographically approved
4. Reliability and Sensitivity Analysis of Substation and Feeder DesignConsidering Correlated Failures
Open this publication in new window or tab >>Reliability and Sensitivity Analysis of Substation and Feeder DesignConsidering Correlated Failures
2017 (English)Conference paper, Published paper (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-215111 (URN)
Conference
2017 CIGRÉ SC B3 (Substations) Colloquium
Note

QC 20171003

Available from: 2017-10-02 Created: 2017-10-02 Last updated: 2017-10-03Bibliographically approved
5. System Reliability CentredDistribution Network Reconfiguration Considering Investment and Outage Cost
Open this publication in new window or tab >>System Reliability CentredDistribution Network Reconfiguration Considering Investment and Outage Cost
(English)Manuscript (preprint) (Other academic)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-215114 (URN)
Note

QC 20171003

Available from: 2017-10-02 Created: 2017-10-02 Last updated: 2017-10-03Bibliographically approved

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