The test system for the study is a long transmission system
compensated by a TCSC and connected to a firm voltage
source on each side. Figure 1 shows a single line diagram of
the test system where the transmission line is represented by a
lumped resistance and inductance in accordance with the
approach for sub-synchronous resonance studies [7]. Each
phase of the TCSC is composed of a fixed capacitor in parallel
with a Thyristor Controlled Reactor (TCR). The TCSC is