Enhancement of Power System Security through Optimal Placement of TCSC and UPFC

In emerging electric power systems, increased transactions often lead to situations where system no longer remains in the secure operating region. The flexible AC transmission system (FACTS) controllers can play an important role in the power system security enhancement. However, due to high capital investment, it is necessary to locate these controllers optimally in the power system. In this paper, a sensitivity based approach has been proposed to decide optimal location of thyristor controlled series compensator (TCSC) and unified power flow controller (UPFC). These factors have been derived in terms of change in a real power flow performance index with respect to their control parameters. The effectiveness of the proposed controllers has been tested on IEEE 30 bus and a 246 bus practical Indian system.