In the present day power system planning and 5. Remove line no (1) operation , considerable interest is being shown in contingency 6. Modify the admittance matrix Y, Susceptance matrix B analysis. Contingency screening and ranking is one of the for line outage. important components of on-line system security assessment 7. Perform Newton raphson load flow or Fast decoupled load which is done with the help of various computer softwares which flow for outage case and find V and 6 for all buses. employ iterative methods like Newton Raphson and Fast 8 Calculate power flows for this contingency. Decouple Load Flow Methods for obtaining the magnitudes ofI a various parameters. The objective of contingency screening and 9 Calculate the performance index of this line by real power ranking is to quickly and accurately select a short list of critical flows contingencies from a large list of potential contingencies and n2n rank them according to their severity . Suitable preventive PI(P) W Pinew() control actions can be implemented considering contingencies 2n that are likely to affect the power system performance. Network i=1 nPilimit contingencies often contribute to overloading of network 10. Calculate voltage index by branches, unsatisfactory voltages and also leading to voltage 2n collapse. To maintain security against voltage collapse, it is nB W rv -v desirable to estimate the effect of contingencies on the voltage PI(V) ew IBase (2) stability. This research paper presents a new approach using i 2n L 0.05 ( fuzzy logic to evaluate the degree of severity of the considered contingency and to eliminate masking effect in the technique. The I1 .Calculate the reactive power index by proposed approach, in addition to real power loadings and bus nL F 1 2n voltage violations, voltage stability indices at the load buses are PI(Q) Z w q inew also used as the post-contingent quantities to evaluate the *) 2n qil3mit
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