Selection of Line Contingency for Power System Security Analysis

Contingency analysis (CA) has always been an in integral part of power system security analysis. CA is a useful tool at disposal of operation personnel to see effects of future outages on the system. The overload Performance Index (PI) is a good index for ranking the contingencies as per their severity. The PI requires “n” number of DC analysis to create a complete index, where n is no of lines. And for a larger network having a higher multitude of lines, it is time consuming. A new approach has been discussed for ranking the contingencies. This method requires one DC analysis and line outage distribution factor, which is constant for a particular unchanged transmission network