Optimal under voltage load shedding based on voltage stability index

This paper presents a methodology for under voltage load shedding using a metaheuristic optimization technique and stability criteria. In this paper, two strategies are proposed to find the minimal amount and location of load to shed for the recovery of normal operation conditions. The first is based in a classical criterion for the under voltage load shedding, identifying the load to disconnect considering the voltage level in the bus; the second includes a simplified voltage stability index SVSI, which identifies critical buses in the system. The proposed methodology is implemented in an IEEE 14 bus test system subject to a several disturbances to validate its efficiency.