This paper studies the impact of unified power flow controller (UPFC) in the Nigeria 330kv integrated power network. The test system consists of seventeen generating stations fifty two buses and sixty four transmission lines. A Matlab program incorporating UPFC in Newton-Raphson power flow program was developed. The power flow study without flexible alternating current transmission systems (FACTS) devices had the total real and reactive power losses to be 53.40MW and 93.300Mvar respectively. However with the introduction of the unified power flow controllers in the weak buses, it gave the real and reactive power losses to be 16.40MW and 22.80Mvar. The new bus voltage values obtained were: (New Haven 0.962pu, 317.46kV; Makurdi 0.997pu, 329.01kV; Damaturu 0.981pu 323.73kV; Gombe 0.992pu 327.36kV; Maiduguri 0.964pu 327.36kV; Jalingo 0.961pu 317.13kV; and Erunkan 0.972pu 320.76kV) and Jos 0.997pu, 329.01KV. Furthermore, UPFC saved (38.8MW+71.80Mvar) for the network.

Full text: IJEIR_90_Final.pdf