A COMPARATION STUDY IF DYNAMIC VOLTAGE COLLAPSE PREDICTION INDICES IN A POWER SYSTEM

The paper presents a study in comparing the performance of several indices used for predicting dynamic voltage collapse. The indices considered in the study are named as the power margin, impedance stability index, line index and voltage collapse prediction index. to evaluate and compare the effectiveness of these indices in predicting proximity to voltage collapse. simulations are carrier out using the WSCC 9 bus test system. Test results show that the impedance stability index and the voltage collapse prediction index give a reliable and faster indication of dynamic voltage collapse compared to the margin and the line index