Subtransmission system reliability enhancement using a thyristor controlled series capacitor

Summary form only given as follows. This paper examines the impact of thyristor controlled series capacitors (TCSC) on distribution substation system reliability. In this application, the TCSC are employed in a system to adjust the transmission infeed impedances and, therefore, increase the transmission system capacity without increasing the system fault current levels. In this context, a reliability model of a multi-module TCSC has been developed and incorporated in the transmission system. Two kinds of performance indices designated as the delivery-point and system indices are presented to examine the impact of TCSC on the subtransmission system reliability. The results of the investigations show a significant improvement in the delivery point and system reliability when utilizing the TCSC. The technique is illustrated by application to several different subtransmission schemes.