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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1, Number 1, May 2009

Issue on Computer Science

Page(s): 490-494

Fuzzy Approach to Contingency Ranking

Shobha Shankar, A. P. Suma, and T. Ananthapadmanabha

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The contingencies contribute to overloading of network branches and unsatisfactory voltages, which may lead to problems of stability/voltage collapse. The most important task in security analysis is the problem of identifying the critical contingencies from a large list of credible contingencies and rank them according to their severity. This paper presents fuzzy approach for ranking the contingencies using composite-index. The fuzzy approach uses post-contingent bus-voltage profiles and L-index used as static voltage collapse proximity indicator to compute voltage stability margin. The composite index based on severity of bus voltage profiles and L-index is used to evaluate contingency ranking. The proposed approach is tested on IEEE-30 bus system.

Index Terms

Contingency Ranking, L-index, Composite index, Fuzzy Sets

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