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Contingency Severity Ranking Using Direct Method in Power Systems  

Lee, Sang-Keun (국립원주대학 전기과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.54, no.2, 2005 , pp. 67-72 More about this Journal
Abstract
This paper presents a method to select contingency ranking considering voltage security problems in power systems. Direct method which needs not the detailed knowledge of the post contingency voltage at each bus is used. Based on system operator's experience and knowledge, the membership functions for the MVAR mismatch and allowable voltage violation are justified describing linguistic representation with heuristic rules. Rule base is used for the computation of severity index for each contingency by fuzzy inference. Contingency ranking harmful to the system is formed by the index for security evaluation. Compared with 1P-1Q iteration, this algorithm using direct method and fuzzy inference shows higher computation speed and almost the same accuracy. The proposed method is applied to model system and KEPCO pratical system which consists of 311 buses and 609 lines to show its effectiveness.
Keywords
Direct method; Rule Base; Fuzzy Inference; Contingency Ranking;
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