Voltage stability; Contingency ranking; Simulation reactive support
This paper presents an efficient approach for line outage contingency ranking based on voltage stability concerns. This is achieved through non-iterative fast calculation of reactive support and voltage security indices using Norton's equivalent. Earlier approach required full AC load flow for every contingency simulation. Results for IEEE, 30 bus, 57 bus and an Indian 91 Bus Power Systems have been obtained to demonstrate the effectiveness of the algorithm.