WAVELET BASED DIGITAL PROTECTION SCHEME FOR SERIES COMPENSATED MULTI-TERMINAL TRANSMISSION SYSTEM IN THE PRESENCE OF TCSC

Abstract

In this paper, a new digital protection scheme for series compensated multi terminal transmission system with thyristor controlled series capacitor(TCSC) is presented. The performance of a distance relay will drastically be affected by the presence of FACTS devices like TCSC in transmission system. The complete digital simulation of TCSC within a transmission system is performed using Matlab/Simulink. The faultindices of all the phases at all the terminals are obtained by analyzing the detail coefficients of current signals through Bior 1.5 mother wavelet. The fault detection, classification, and faulty terminal identification is done with variations in fault distance and fault inception angle for all types of faults and the method is found to be reliable and takes less than half a cycle and almost independent of fault impedance and inception angles.