Effect of TCSC on Power System Stability

In FACTS devices supplementary signals are widely used to mitigate sub synchronous resonance in power system. Sub synchronous resonance occurs due to series capacitor in the power systems. In this paper Effect of TCSC on power system performance is studied and it is shown that TCSC can bring down SSR frequency and at high value of series capacitive reactance it can stabilize all the modes of turbine- generator set without supplementary signal. The study system is IEEE first benchmark model. Modeling of IEEE first benchmark model with TCSC is also presented in this paper. Small signal stability and Large signal stability both are carried out in this paper.