Abstract: This paper proposes an automatic generation control (AGC) of an interconnected two area of non-reheat thermal power system in continuous mode by employing a Thyristor Controlled Series Capacitor (TCSC) connected in series with the line. By controlling the reactance of the TCSC the damping of the system frequency and tie line power oscillations are minimize. Differential Evolution (DE) algorithm has been used for optimization of different parameters. The performance of the Tilted integral derivative controller with Filter (TIDF) without TCSC has been evaluated and the result is compared with TIDF controller without TCSC and TIDF controller with TCSC. Investigations reveal that TIDF controller with TCSC provides better dynamics than TIDF controller without TCSC. It is reported that ITAE criterion improving the peak overshoot as wall as it reduces the peak undershoot of the system.

Keywords: Automatic generation control (AGC), Tilted integral derivative controller with Filter (TIDF), Integral Time multiplies Absolute Error (ITAE), Differential Evolution (DE), Thyristor Controlled Series Capacitor (TCSC).