Subsynchronous Oscillations Thyristor-Controlled Series Power Systems Series Capacitor Transmission

Sub-synchronous oscillation occurs in frequency less than synchronous frequency, in transmission systems compensated by series capacitor and in a state of equilibrium of the system, it imposes great disturbance which brings about tortional modes with varied frequencies in the shaft of the generator which ultimately can result in fatigue in the shaft of the turbine-generator and even might result in fracture in the shaft with irrecoverable damages A thyristor-controlled series capacitor (TCSC) substantially improves transmission capacity and mitigates subsynchronous resonance (SSR). In this paper damping of SSR using NGH scheme has been done. The IEEE first benchmark model is adopted for studying SSR and its simulation. This model has been used in most researches of SSR. Finally, using PSCAD software, NGH scheme has been simulated. Simulation results show that NGH scheme is effective in damping and works successfully.

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