Abstract The advent of series FACTS controllers, Thyristor Controlled Series Capacitor (TCSC) has made it possible not only for the fast control of power flow in a transmission line, but also for the mitigation of sub-synchronous resonance (SSR) in the presence of fixed series capacitors. This paper presents a detailed analysis of the impact of TCSC control methodology on sub-synchronous oscillations (SSO) problem of series capacitive compensated transmission systems. The second IEEE benchmark model for the analysis of SSR phenomena is adopted. The impact of control methodology is also evaluated on the torsional modes. As a result it was shown that this applied strategy is powerful method for SSR damping. So TCSC can also damp SSO as shown in simulations. The proposed method is applied to the IEEE Second Benchmark system for sub-synchronous resonance studies and the results are verified based on comparison with digital computer simulation by MATLAB.

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