Due to the excessive load demand and non-linearity in loads leads to voltage instability and ultimately leading to voltage collapse. Voltage collapse has to be given the utmost priority because it led to cascading blackouts in the whole network. A voltage stability index is that which examines the voltage stability condition formulated based on line in a power system and identifies weak bus of the system to maintain the stable system, which will be great importance. This paper deals with the development of the weak area clustering technique based on the results obtained from voltage stability analysis and contingency analysis.

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