Efficient performance indices for voltage collapse detection

This paper proposes four performance indices (PIs) for efficient detecting the most weakness load buses which may be subjected to voltage collapse occurrence at different operating conditions. The classification of the suggested ranking PIs are dependent on their severity on the voltage collapse. The suggested PIs are based on physical quantities as equivalent system impedance and the related load impedance at each load bus, equivalent system admittance and the related load admittance at each load bus for different operating conditions. These PIs derived based on circuit theory applied to passive linear network power systems and tested using two standard systems, namely IEEE 14-bus and 30-bus test systems. The results detect efficiently the most sever load buses which may be subjected to voltage collapse occurrence.