Abstract:
Competition is on rise in generation and distribution, which results huge transactions. Nonetheless, transmission lines are overloaded, since transmission system provides access of electricity having limited corridors. Consequently, the probability of congestion tends to be prominent. Congestion in transmission corridors not only causes collapse of that particular area but affects other area as well. Therefore, improvement of ATC of existing network by any means is essential. For this, various FACTS devices like UPFC, SSSC, TCSC, STATCOM, etc. may be used to improve the ATC of transmission lines. In this paper TCSC is employed in IEEE 5 bus system and IEEE 30 bus system to improve the ATC of transmission lines. In this paper ACPTDFs are used to evaluate the change in line flows. Due to the change in line flows the ATC of the transmission line also reflects changes. Both the real power and reactive power flows are considered in this paper.

Keywords: Available Transfer Capability (ATC), AC Power Transfer Distribution Factor (ACPTDF), Linear ATC, Reactive Power, Thyristor Controlled Switched Capacitor (TCSC)