Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Reliability Evaluation of Distribution Structures Considering the Presence of False Trips
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion. (RCAM)ORCID-id: 0000-0003-4021-839X
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.ORCID-id: 0000-0002-2964-7233
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
2018 (engelsk)Inngår i: IEEE Transactions on Smart Grid, ISSN 1949-3053, E-ISSN 1949-3061Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
IEEE, 2018.
Emneord [en]
substation protection, Circuit breakers, control equipment, failure rate modelling, power distribution faults, power system control, power system reliability
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-174183DOI: 10.1109/TSG.2016.2609684ISI: 000430715400066Scopus ID: 2-s2.0-84992090869OAI: oai:DiVA.org:kth-174183DiVA, id: diva2:858242
Merknad

QC 20170220

Tilgjengelig fra: 2015-10-01 Laget: 2015-10-01 Sist oppdatert: 2018-11-06bibliografisk kontrollert
Inngår i avhandling
1. Reliability Evaluation of Distribution ArchitecturesConsidering Failure Modes and Correlated Events
Åpne denne publikasjonen i ny fane eller vindu >>Reliability Evaluation of Distribution ArchitecturesConsidering Failure Modes and Correlated Events
2015 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Power systems are in a phase of automation where intelligent components and sub-systems are employed to monitor, control and manage the grid. Quantifying the complex consequences on system reliability, from the integration of such automated and semi-automated equipment into the existing grid is important for maintenance optimisation and fault mitigation. This thesis identifies the  advanced approaches in power system reliability analysis with the potential to capture the complications and correlations in modern power grid after reviewing the traditional reliability evaluation methods.

A method for modelling the different modes of failures, possible in a substation and feeder architecture along with the probable false tripping scenarios was developed. An improved Reliability Block Diagram based approach was designed to count in the traditionally unaccounted failure cases affecting both the primary grid and the protectionand control equipment. The effect and corresponding trend of additional feeder lines in a radial distribution system on the net interruption rate experienced at load ends of feeders are derived and modelled. Such real-world substation architectures are analysed and the aforementioned trends are compared with those from the practical grid. Thus, the analysis was able to identify and measure the complex hidden failure probabilities due to both unwanted operation of breakers and functional failure of protection systems.

The measured probabilities were used to calculate the impact of protection and control equipment on system  reliability. The obtained results were verified by comparing it with the observations by energy researchers on ten years of protection system failure statistics. The application of the model and results, in optimal maintenance planning and power network optimisation are identified as the next step.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2015. s. xi, 38
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-174178 (URN)
Presentation
2015-10-20, Q21, Osquldas väg 6B, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20151002

Tilgjengelig fra: 2015-10-02 Laget: 2015-10-01 Sist oppdatert: 2015-10-21bibliografisk kontrollert
2. Reliability Evaluation of Distribution Systems Considering Failure Modes and Network Configuration
Åpne denne publikasjonen i ny fane eller vindu >>Reliability Evaluation of Distribution Systems Considering Failure Modes and Network Configuration
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2017. s. 47
Serie
TRITA-EE, ISSN 1653-5146 ; 2017:138
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-215115 (URN)978-91-7729-552-5 (ISBN)
Disputas
2017-10-24, Kollegiesalen, Brinellvägen 8, Kungl. Tekniska högskolan, Stockholm, 13:00 (engelsk)
Opponent
Veileder
Merknad

QC 20171004

Tilgjengelig fra: 2017-10-04 Laget: 2017-10-02 Sist oppdatert: 2017-10-04bibliografisk kontrollert

Open Access i DiVA

fulltext(932 kB)96 nedlastinger
Filinformasjon
Fil FULLTEXT02.pdfFilstørrelse 932 kBChecksum SHA-512
add53c1b390f2e1b4aeec3f61a79c291d6097f0c8e36152690100374926272cb17560a31f38002c6de23736c2a563713d544d0f267765184a315d8f739546b97
Type fulltextMimetype application/pdf

Andre lenker

Forlagets fulltekstScopushttp://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7567513

Personposter BETA

Babu, Sajeesh

Søk i DiVA

Av forfatter/redaktør
Babu, SajeeshHilber, PatrikShayesteh, EbrahimEnarsson, Lars Einar
Av organisasjonen
I samme tidsskrift
IEEE Transactions on Smart Grid

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 96 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 629 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf