Critical lines based weak area clustering using voltage stability analysis and contingency ranking in power system

Power system stability is one of the prime issues in this emerging world of the technologies and development. 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. In order to avoid this voltage collapse subsequent such as voltage stability and contingency analyses are carried out. 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. Uncontrolled load rejection due to voltage collapse can cause system separation and block outs. Hence the system must be planned in such a way as to reduce the possibility of voltage instability. Also the system must be operated with adequate margin for voltage stability. This paper deals with the development of the weak area clustering technique based on the results obtained from voltage stability analysis and contingency analysis. The weak area clustering which will help the power engineers to give more emphasis on these weak areas and to enhance the system voltage stability.