Comparison of series and combined series-shunt compensation on East-West Interconnectors of Bangladesh Power System

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 and stability. This paper compares the application of series and series-shunt compensation by means of TCSC and SVC to show enhancement of power transmission capacity and stability of East-West Interconnected System (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. Bifurcation, steady state, and transient analyses are performed to compare positive effect of series and series-shunt compensation on transmission capacity and stability in BPS network.