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An Approach for Optimal Placement of UPFC to Enhance Voltage Stability Margin under Contingencies

This paper proposes a sensitivity based technique for optimal placement of Unified Power Flow Controller (UPFC) to enhance voltage stability margin under contingencies. The sensitivity of system loading factor with respect to the reactive power flowing through lines computed for the system intact case and critical contingency cases have been used to decide optimal location for the placement of UPFC. The proposed sensitivity factor has been derived from the reactive power flow balance equation. The effectiveness of the proposed method for the placement of UPFC in voltage stability margin enhancement has been validated on a practical 75-bus Indian system representing Uttar Pradesh State Power Corporation Network.