Alireza Solat - Bu-Ali Sina University
Ali Deihimi

This paper proposes a novel scheme to improve distance protection of compensated transmission lines with Thyristor Controlled Series Capasitor (TCSC). The method usesthe type of dynamic feed-forward neural networks called Time Delayed Neural Network (TDNN) to estimate instantaneousvalues of the voltage across TCSC and then compensates it from the relay voltage signal to mitigate its effects on the measured impedance by distance relays. This technique is simple andaccurate and requires only local current at the relay bus. Extensive testing in detail using MATLAB demonstrate that thismethod is well suited for implementating in a distance relay to improve the reach measurement accurately and effectively

Thyristor Controlled Series Capacitor, Time Delayed Neural Network, Distance protection