Abstract：The thyristor controlled series capacitor (TCSC) can provide inductive reactance under subsynchronous frequencies. However, in a hybrid system which includes both conventional fixed series compensation and TCSC, disturbances may still excite torsional modes. A supplementary damping controller of TCSC is designed to provide active electrical damping for SSR mitigation. The design method is base on phase compensation principle and the procedure for the syntheses of the controller is presented in detail. The effectiveness of the controller is validated using modified IEEE SSR first benchmark model both in frequency domain and time domain. The simulation results indicate that the proposed controller is effective to mitigate SSR.
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2011, Vol. 26 
