Development Of A Sensitivity Index Based Technique For Unified Power Flow Controller Placement With Contingency Analysis On Nigeria 330kv Transmission Network

Power system network is designed to operate in a prescribed voltage and frequency for stabilityand for better power quality. Unexpected contingencies leads to instability related problems inthe system. This research develops a sensitivity index based technique with contingencyanalysis for Unified Power Flow Controller (UPFC) placement for Nigeria 330kV powertransmission system. The research employed Newton Raphson power flow method consideringmultiple contingency analyses which include double line outages, line and load outages, doubleload outages and load increments. The identification of the severity of the violated bus voltageswas achieved through the use of Active Power Performance Index (APPI) and Reactive PowerPerformance Index (RPPI). The contingency cases were addressed through the sizing andplacement of UPFC on the network and simulated in Matlab R2013a environment. The analysesshows that the predominately violated buses and the sizes of the UPFC placed are Maiduguribus (-183 MVar), Birni Kebbi bus (99 MVar) Oshogbo bus (-84MVar), Jos bus (-28 MVar),Gombe bus (-13 MVar) and Kano bus (21 MVar). The result shows 1.3% (694.6233MVar)reduction in the total reactive power loss as compared with base case of (703.7499MVar) afterthe placement of UPFC and a total voltage improvement of 3.11% (31.9298pu) as compared tothe base case voltage deviation of (32.9541pu). The developed approach was analyzed on IEEE30 bus network with a transmission line power loss reduction of (0.00166pu) and a voltageimprovement of 0.83% (30.6753pu) as compared to the work of Reddy et al., (2014) with powerloss of (0.02116pu) and a voltage of (30.4214pu).

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