A novel collapse prediction index for voltage stability analysis and contingency ranking in power systems

Abstract Voltage instability is a serious phenomenon that can occur in power system because of critical or stressed conditions. To prevent voltage collapse caused by such instability, accurate prediction necessary for planning and operation. This paper proposes novel index ( NCPI ) to assess the stability conditions lines. The effectiveness applicability proposed are investigated on IEEE 30-bus 118-bus systems compared with well-known existing indices L mn , FVSI LQP NLSI VSLI under several operations validate its practicability versatility. study also presents sensitivity assumptions analyzes their impact prediction. application results intensive case studies prove adapts operating show superiority accurately estimating maximum load-ability predicting lines, weak buses, areas medium large networks during various load contingencies. A line interruption generation unit outage lead collapse, this contingency system. Line contingencies examined identify lines generators significantly event an outage. ranked most severe outages cause generator.