Dynamic Voltage Collapse Prediction on a Practical Power System Using Power Transfer Stability Index

This paper presents a combined static and dynamic voltage stability analysis method to predict dynamic voltage collapse in a practical power system using the power transfer stability index (PTSI). In the static voltage stability analysis, the contingencies due to load increase at all the load buses are ranked so as to determine the critical contingencies based on the maximum permissible load. Then, dynamic simulations are carried out only for the critical contingency cases. The performance of the PTSI in predicting voltage collapse is evaluated by comparing it with the voltage collapse proximity indicator. To illustrate the effectiveness of the proposed PTSI, simulations were carried out on a practical power system using the PSS/E software. The effects of induction motors and line outage contingency on dynamic voltage collapse were also investigated. Test results prove the accuracy of the PTSI in predicting voltage collapse in a practical power system.