Impact of protection system reliability on power system reliability: A new minimal cutset approach

Vadlamudi, Vijay Venu; Gjerde, Oddbjørn; Kjølle, Gerd Hovin

doi:10.1109/pmaps.2014.6960645

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…When calculating the unavailability and failure probability of second order cut-sets it is necessary to adjust FT3 and FT4 to account for adjacency as was done in the approximate equations, for both lines x and y, as seen in (28) and (29). A time series of dependency mode failure probability for the two lines in conjunction is calculated in (30).…”

Section: Time Series Methodsmentioning

confidence: 99%

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Reliability of Supply and the Impact of Weather Exposure and Protection System Failures

Kiel

Kjølle

2020

Applied Sciences

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Extreme weather is known to cause failure bunching in electrical transmission systems. However, protection systems can also contribute to the worsening of the system state through various failure modes—spontaneous, missing or unwanted operation. The latter two types of failures only occur when an initial failure has happened, and thus are more likely to happen when the probability of failure of transmission lines is high, such as in an extreme weather scenario. This causes an exacerbation of failure bunching effects, increasing the risk of blackouts, or High Impact Low Probability (HILP) events. This paper describes a method to model transmission line failure rates, considering both protection system reliability and extreme weather exposure. A case study is presented using the IEEE 24 bus Reliability Test System (RTS) test system. The case study, using both an approximate method as well as a time-series approach to calculate reliability indices, demonstrates both a compact generalization of including protection system failures in reliability analysis, as well as the interaction between weather exposure and protection system failures and its impact on power system reliability indices. The results show that the inclusion of protection system failures can have a large impact on the estimated occurrence of higher order contingencies for adjacent lines, especially for lines with correlated weather exposure.

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Section: Time Series Methodsmentioning

confidence: 99%

“…This corresponds to the protection system misoperation types defined in [27]. Protection systems have previously been incorporated in power systems reliability analysis in multiple ways, such as through Markov models [14,16] and approximate methods [17,28].…”

Section: Failure Bunching and Protection System Failuresmentioning

confidence: 99%

Reliability of Supply and the Impact of Weather Exposure and Protection System Failures

Kiel

Kjølle

2020

Applied Sciences

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“…The reliability of protection systems has a considerable effect on the reliability of supply, and hence appropriate protection system reliability models must be incorporated in power system reliability studies. The embedded approach circumvents the need for complex Markov models to include the effects of protection system reliability by enhancing the minimal cut set approach presented in the previous section [4], [12].…”

Section: Protection System Reliabilitymentioning

confidence: 99%

“…Accordingly, equivalent failure rates of transmission lines can be obtained from appropriate mathematical modelling of the identified failure scenarios. Four mutually exclusive failure modes, denoted as fault types (FTs) were identified and modelled in our previous works [4], [12], [14]. A brief generic description of such fault types is presented below.…”

Section: A Basic Approachmentioning

confidence: 99%

“…This is on account of dependencies among the elements of MC. For every MC of transmission lines, dependent mode failure rates as mandated by backup protection coordination among the neighbouring elements if any are computed, and all the MCs are duly combined using the approximate series system reliability logic [4], [12]. An overview of the basic formulae used in [12] is presented below:…”

Section: B Equivalent Failure Ratesmentioning

confidence: 99%

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Enhanced method for reliability of supply assessment - an integrated approach

Gjerde

Kjølle

Jakobsen

et al. 2016

2016 Power Systems Computation Conference (PSCC)

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A comprehensive analysis of reliability of electricity supply to end users requires a unique set of models, methods and tools. Of special significance are long term power market models for predicting future operating states (generation and load patterns) and more detailed network simulation models for analysing consequences of contingencies. This paper describes an integrated approach for reliability of supply analysis, assessing reliability and interruption costs down to the specifics of different kinds of end users at different delivery points in the network model. Furthermore, the effects of power system protection, temporal variation of parameters, and corrective actions as part of the consequence analysis, are taken into account in the presented integrated approach. The results are illustrated through a case study on a realistic hydro dominated four-area meshed test system.

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Parallel computing based distribution network reliability evaluation technology research

Feng

Guo

et al. 2017

2017 IEEE Conference on Energy Internet and Energy System Integration (EI2)

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Impact of protection system reliability on power system reliability: A new minimal cutset approach

Cited by 7 publications

References 11 publications

Reliability of Supply and the Impact of Weather Exposure and Protection System Failures

Reliability of Supply and the Impact of Weather Exposure and Protection System Failures

Enhanced method for reliability of supply assessment - an integrated approach

Parallel computing based distribution network reliability evaluation technology research

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