Optimal Allocation and Sizing of Reactive Power Source for Voltage Profile Improvement on Nigerian 330kV, 24 Bus Grid System
Complete or partial blackout, poor power quality and damage to connected electrical pieces of equipment at the consumer end among others are day to day experience in Nigeria. One of the major causes of this scenario can be attributed to inability of electric power system to maintain a proper voltage level throughout the entire system. This paper addresses the problem of voltage violation on Nigerian 330kV, 24 bus grid system using shunt capacitor injection at defective buses. Newton Raphson power flow solution method was use to carry out load flow analysis with and without shunt capacitor injection. The acceptable voltage limit ranges from 0.95 p.u to 1.05 p.u, voltage at bus 4, 9, 13, 14, 16 and 19 were found to fall below the minimum acceptable limit of 0.95 p.u, to improve the voltage at these buses a calculated amount of Mvar was injected at each buses respectively using the following capacitor sizes (110 Mvar, 3mF) (90Mvar, 26 mF) (58Mvar, 17mF) (50 Mvar, 16mF) (38Mvar, 12mF) and (20Mvar, 7mF) The study shows that the injected MVAr via shunt type capacitors significantly improve the system voltage profile, voltage angles andthe total system losses before compensation was found to be 82.5982MWand after compensation the losses reduced drastically to 82.2826MW.