MAXIMUM LOADABILITY ESTIMATION FOR WEAK BUS IDENTIFICATION USING FAST VOLTAGE STABILITY INDEX IN A POWER TRANSMISSION SYSTEM BY REAL-TIME APPROACH

This letter demonstrates the use of line stability index termed as Fast Voltage Stability Index (FVSI) in order to determine the maximum loadability in power system. Voltage stability analysis is conducted using line stability index indicated by FVSI to indicate the stressfulness of a line in a transmission system. The reactive power at a particular bus is increased until it reaches the instability point at bifurcation. At this instability point, the connected load at the particular bus is determined as the maximum loadability. The maximum loadability for every load bus will be sorted in ascending order with smallest value being ranked highest. The highest rank implies the weak bus in the system that has the lowest sustainable load. This technique is tested on the IEEE-30 bus system and a practical 24-bus system in Indian. The Weak area of the Practical system and the Ranking with overloading are found using FVSI