A method for analysing the reliability of a transmission grid

Liisa Haarla (Corresponding Author), Urho Pulkkinen, Mikko Koskinen, Jussi Jyrinsalo

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)

Abstract

The paper describes a probabilistic method for transmission grid security evaluation. Power system security is the ability of the power system to withstand sudden disturbances such as short circuits. The method presented here uses event and fault trees and combines them with power system dynamic simulations. Event trees model the substation protection and trip operations after line faults. Different event tree end states (fault duration, circuit breaker trips) are simulated with power system dynamic analysis program. The dynamic analysis results (power system post-fault states) are then classified into secure, alert, emergency and system breakdown. The probabilities, minimal cut sets and grid level importance measures (Fussell-Vesely, risk increase and decrease factors) are calculated for the total and partial system breakdown. In this way, the relative importance of the substation devices regarding to the system breakdown can be reached. Also the more and less likely contributing factors to system breakdown are received. With this method, an existing 400 kV transmission grid with its line fault and device failure statistics is analysed.
Original languageEnglish
Pages (from-to)277-287
JournalReliability Engineering and System Safety
Volume93
Issue number2
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Dynamic analysis
Electric circuit breakers
Security systems
Short circuit currents
Statistics
Computer simulation

Keywords

  • Substation
  • Protection
  • Failure
  • Reliability
  • Power system
  • Transmission
  • Importance

Cite this

Haarla, Liisa ; Pulkkinen, Urho ; Koskinen, Mikko ; Jyrinsalo, Jussi. / A method for analysing the reliability of a transmission grid. In: Reliability Engineering and System Safety. 2008 ; Vol. 93, No. 2. pp. 277-287.
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A method for analysing the reliability of a transmission grid. / Haarla, Liisa (Corresponding Author); Pulkkinen, Urho; Koskinen, Mikko; Jyrinsalo, Jussi.

In: Reliability Engineering and System Safety, Vol. 93, No. 2, 2008, p. 277-287.

Research output: Contribution to journalArticleScientificpeer-review

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AB - The paper describes a probabilistic method for transmission grid security evaluation. Power system security is the ability of the power system to withstand sudden disturbances such as short circuits. The method presented here uses event and fault trees and combines them with power system dynamic simulations. Event trees model the substation protection and trip operations after line faults. Different event tree end states (fault duration, circuit breaker trips) are simulated with power system dynamic analysis program. The dynamic analysis results (power system post-fault states) are then classified into secure, alert, emergency and system breakdown. The probabilities, minimal cut sets and grid level importance measures (Fussell-Vesely, risk increase and decrease factors) are calculated for the total and partial system breakdown. In this way, the relative importance of the substation devices regarding to the system breakdown can be reached. Also the more and less likely contributing factors to system breakdown are received. With this method, an existing 400 kV transmission grid with its line fault and device failure statistics is analysed.

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