Voltage stability based weak area clustering technique in power system

This paper presents the voltage stability based weak area clustering technique in power system. The technique employed voltage stability and line outage contingency analyses. From the voltage stability analysis, the sensitive lines in a system during stressed condition are identified, while line outage contingency analysis identified the critical line outages. A pre-developed voltage stability index was utilised as an indicator to voltage stability condition of the system. The weak areas formed by the lines are identified as the sensitive lines from voltage stability analysis and at the same time the critical line outages identified from line outage contingency analysis. The results show that the lines, which are identified as the weak ones from voltage stability analysis, would also cause critical outages. The proposed technique was implemented on IEEE reliable test system and the results show that distinct weak areas were identified when the system was closed to the stressed condition.