Transmission line efficiency improvement and congestion management under critical contingency condition by optimal placement of TCSC

In this paper placement of thyristor controlled series compensators (TCSC) at optimal location of a power system for maintaining voltage stability, improving transmission efficiency, steady state stability limit and mitigating congestion under single line critical contingency condition is discussed. Optimal location is found out by line voltage stability index and sensitivity analysis. Performance index (PI) is used for finding critical contingency. Under critical contingency condition which is single line outage in this case, congested transmission lines are found. TCSC is a FACTS device which can reduce power loss in overloaded transmission lines, increase loadability, reduce system loss and maintain stability of power systems. This work has been tested on IEEE 14 bus test system using MATLAB.