• Ajit Kumar Singh
• Dr. L.S. Titare

Voltage stability is one of the challenging and burning issues of modern large power system. In this paper, an algorithm has been developed to determine the optimal location of UPFC which supplies VARs subject to operational inequality constraints based on sensitivity of minimum eigen value and real & reactive loss index for the enhancement of voltage stability. The load flow solution is carried out with continuation power flow method using MATLAB software. Sensitivity of minimum eigen value is the change in minimum eigen value of load flow Jacobian to the change in reactive power which is to be injected and change in losses with respect to change in system load. Ranking of load buses has been evaluated based on sensitivity of these indexes using power flow technique. Highest sensitivity of transmission line and buses which are connected across, indicates weakest line and the order of other lines so on. Order of sensitivity of line for the placement of UPFCs is again obtained and verified using developed Genetic Algorithm based algorithm. First two to three lines are selected which have higher order sensitivity for injection of VARs through UPFC. Developed algorithm has been implemented on IEEE 30-bus system.

Unified Power Flow Controller; Voltage Stability; Continuation power flow: minimum eigen value sensitivity index; Real & reactive Power Index.

"OPTIMAL PLACEMENT OF UNIFIED POWER FLOW CONTROLLER (UPFC) TO IMPROVE VOLTAGE STABILITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 7, page no.723-730, July-2018, Available :http://www.jetir.org/papers/JETIR1807566.pdf

"OPTIMAL PLACEMENT OF UNIFIED POWER FLOW CONTROLLER (UPFC) TO IMPROVE VOLTAGE STABILITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 7, page no. pp723-730, July-2018, Available at : http://www.jetir.org/papers/JETIR1807566.pdf