In this paper the effectiveness of Static Var System (SVS) auxiliary controller in coordination with controlled series compensation has been demonstrated for damping power oscillations for wide range of operating conditions. A new SVS auxiliary controller, known as the combined derivative of reactive power and derivative of computed internal voltage (CDRPDCIV) auxiliary controller has been developed and incorporated in the SVS control system located at the middle of a series compensated long

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... nsmission line to get most effective damping effect. The first IEEE benchmark model for analysis of torsional modes has been adopted. Eigen value analysis study is conducted for various levels of power transfer and series compensation. The results of eigen value analysis are validated by carrying out time domain analysis study based on non linear model. The proposed SVS auxiliary controller in coordination with CSC with its bang -bang form of control is very effective in damping power system oscillations over a wide operating range under large disturbance conditions thus enhancing the Transient performance of the power system.