Line outage contingency screening and ranking for voltage stability assessment

This paper presents the voltage stability based weak area clustering techniques in power system. The techniques employed voltage stability analysis (VSA) and Line outage contingency analysis (LOCA). From the VSA and LOCA, the most critical lines in a system during stressed condition are identified. A predeveloped voltage stability index was utilized as an indicator to voltage stability condition of the system. The weak areas formed by the lines are identified as the most critical lines. The results show that the lines which are identified as the weak lines from stability analysis. 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.