Power transmission capacity enhancement of east-west interconnectors using series-shunt compensation

Abstract

Utilization of the existing transmission line capacity to its fullest is most important due to the continuous growth of the demand and rising cost of new transmission infrastructures. Due to the problems associated with voltage drop and stability limits, a transmission line can not be loaded up to its thermal limit. The potential benefits of installing Flexible AC Transmission System (FACTS) devices on the system for enhancing power transmission capacity and stability are well known. Two main members of FACTS family like thyristor controlled series capacitor (TCSC) and static var compensator (SVC) have been widely studied and reported in technical literature and have been shown as effective as well as time saving alternative to building new transmission lines for enhancing power transmission capacity. This thesis examines the application of seriesshunt compensation by means of TCSC and SVC to enhance power transmission capacity of two East-West Interconnectors (EWIs) of Bangladesh Power System (BPS). Two SVCs are connected in parallel with two buses in the western region of the interconnectors and two TCSCs are connected in series with the interconnectors. Modal analysis is performed to tune parameters of damping controllers of these FACTS devices. Bifurcation, steady state, and transient analyses clearly demonstrate positive effect of series-shunt compensation on transmission capacity and stability in BPS network.