An Improved Method for Dynamic Voltage Collapse Prediction in Power System

This paper presents an improved method for predicting dynamic voltage collapse in power systems by developing the power transfer stability index. The generator governor and excitation dynamics, induction motor and under load tap changer are considered in the simulation process. Time domain simulations using the PSAT software program has been carried out in this work. Several contingencies have also been considered in the simulations including real and reactive power load increase, line outage and generator outage. The proposed PTSI index has been investigated for its applicability in indicating proximity to voltage collapse. The performance of the index was tested using the thirty nine-bus test system and studied under various operating conditions. Simulation test results prove that the proposed PTSI index gives a better prediction of dynamic voltage collapse compared to the voltage collapse prediction index.