PERFORMANCE COMPARISON OF SVC AND TCSC

Abstract

—Voltage stability in power system is the capability to keep adequate voltages in all buses at normal
conditions and even conditions after disturbances. Due to voltage instability, the power system experiences voltage
collapses if the post-disturbance equilibrium voltages are below acceptable limits, causing total blackout. It is
understood by many experts that the power system will be used with a lesser margin to voltage collapse in the future.
Hence, voltage stability is believed to be of bigger concern in the future. Voltage stability of a system is affected by the
reactive power limit of the system. FACTS devices improve the reactive power flow in the system, thereby, improving
voltage stability. This paper explores the effect of SVC (Static VAR Compensator), TCSC (Thyristor-Controlled Series
Capacitor) and Hybrid (combination of both) Controller on static voltage stability. IEEE-14 bus has been used to
demonstrate the ability of these FACTS devices in improving the voltage stability margin.