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Performance Analysis of Multi-Machine System Using UPFC

Dr. P.R. Sharma, Dr. Rajesh Kr. Ahuja, Shakti Vashisth

In this paper best location of UPFC placement is identified on the basis of maximum loadability of a system. Simulation is done by using standard data of IEEE-14 bus system. Load reactance is increased by 5 %, 10 %, 15%, 20%, 25%, 30%, 35%, and 40%. Voltage stability index namely L-INDEX and FVSI is calculated at each percentage change in reactive load. Weakest line, the line at which voltage stability index has highest value and lower value of voltage, is measured using voltage stability index. UPFC is placed onthe most critical line which improves the voltage stability and minimizes the losses in the transmission system.