Congestion management with FACTS devices in deregulated electricity markets ensuring loadability limit

This paper addresses an important issue of transmission system congestion management in a pool electricity market environment with the consideration of voltage stability as loadability limit. The optimal generators’ rescheduling has been obtained for three block bid structure submitted to the ISO in a day-a-head market. The base case economic load dispatch has been obtained for generators ensuring the loadability limits and is taken as base case generation output data during the congestion management to obtain new generation scheduling. The generation pattern has been obtained for three bid blocks taking load variation for 24 h considering load scaling factor. The three block bid structure offered to the ISO has been modeled as a linear curve, function of up and down rescheduling within the upper and lower limits offered for congestion management. The impact of third generation FACTS devices has also been studied on the optimal rescheduling of generators’ outputs and thereby the congestion cost. The results have been obtained for IEEE 24 bus and IEEE 57 bus test systems.

► Rescheduling based CM considering both static security and voltage stability limits. ► Three linear block bid structure to manage congestion. ► FACTS controllers STATCOM, SSSC, and UPFC have been modeled for congestion management. ► Optimal location of devices has been proposed based on congestion distribution factors.