Abstract
Thyristor controlled series capacitor (TCSC) is a series type flexible AC transmission system (FACTS) device which can effectively change the impedance of a transmission line. This paper is concerned with developing a linear incremental model for a TCSC and its application to improve the performance of automatic generation control (AGC) of two-area interconnected hydrothermal power system. The optimised integral gain values of AGC are obtained using integral squared error (ISE) technique. A quadratic performance index considering a step load perturbation in either of the areas is considered for minimisation. Simulation results suggest that, incorporating a TCSC is very effective in damping the low frequency oscillations in area frequencies as well as the tie-power after a sudden load perturbation in any of area compared to AGC without TCSC.
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