Load Flow Analysis of 132/11 KV Grid Station Bahawalpur region Pakistan and its Voltage Improvement through FACTS Devices using ETAP

Voltage variations are resulted due to the change in the reactive power caused by the variation in the transmitted load in an electrical power system. Theses variations badly affect the power quality. Flexible AC Transmission system device i.e. SVC is used to improve the voltage. Load Flow study is done on a 132/11 kV substation of Bahawalpur region in Pakistan on ETAP simulation software, in order to determine the drop in voltage and power. Newton Raphson method is adapted for the load flow studies due to its several benefits like convergence rate, less number of iterations and fewer requirements for time. Marginal as well as critical buses are located by simulating the substation in LF module of ETAP. Best location for the placement of SVC in the distribution system is found by the Optimal Capacitor Placement (OCP) module of ETAP. Best ratings of SVC are also found in the same module. Results are obtained before and after the placement of SVC in the distribution system. Results show that the voltage levels at most of the buses are improved as a result of SVC placement. Power factor of the system is also improved from 85% to 99%. It is concluded from the results that SVC is an outstanding power electronic device to make a major contribution in the voltage improvement of a distribution system.