ADAPTIVE DISTANCE RELAY SETTING FOR PARALLEL TRANSMISSION NETWORK CONNECTING WIND FARMS AND UPFC

Abstract

An adaptive distance relay setting for parallel transmission lines when a unified power flow controller and wind farm are connected to a parallel transmission network. An ideal trip characteristic of distance relay is significantly affected as the apparent impedance seen by the relay is affected. Reach setting of distance relay is affected when a wind farm is connected to it because of continuous fluctuation in relay voltage. Transmission-Line protection in the presence of a unified power-flow controller (UPFC) is one of the major challenging issues in power system protection. The presence of the UPFC in a fault loop affects the steady state and transient component in the voltage and current signals.