Evaluation of Performance Index Methodology for Power Network Contingency Ranking

Line outage contingency ranking and analyses using various Performance Index (PI) approaches are investigated in this study. Independent contingency rankings based on voltage, real power, reactive power, voltage fused with reactive power and real power amalgamated with voltage fused reactive power PI are the ranking methods used. Analyses of most severe contingencies resulting from different ranking methods are carried out and the behavioural patterns of the affected transmission lines investigated and validated. Newton Raphson power flow equations developed in Matlab environment are used for these analyses while IEEE 30 bus network is the test system. Line 28–27 outage which is the most severe contingency based on voltage PI ranking resulted into both line overloads and bus voltage limits violations, while outage of line 2–5 which is the most severe contingency consequent of real power PI ranking only resulted into line thermal limits violations.