Optimal sizing and Placement of Static Var Compensator for Voltage Stability Enhancement in Radial Distribution Network using Particle Swarm Optimization (Case Study: Gefersa Substation Outgoing Feeder)

Abstract

Urbanization and the ongoing rise in power consumption necessitate the use of a dependable and high-quality power supply system. Unfortunately, a number of issues have arisen with the current power distribution system, making it unable to securely and dependably provide the growing demand for power. Power loss, a poor voltage profile, significant power interruptions, distorted voltage and current at the customer end, and unstable voltage in the system node are the primary issues in the distribution system that affects performance. The performance of the distribution was enhanced by utilizing the appropriate size and positioning of the SVC. The Gefersa 14 outgoing feeder, which is part of the Gefersa distribution network, is the subject of the study. In order to assess power loss and voltage profile of the chosen feeder, the Backward-Forward Sweep (BFS) method implemented in MATLAB has been modeled and load flow analysis conducted. Multi objective function was formulated in this thesis including voltage profile, real and reactive power loss by using appropriate sizing and positioning of SVC using PSO. By using optimal power flow backward/forward load flow analysis at base case the power loss and the voltage of each bus is obtained. From the result of base case real and reactive power loss are 401.432 KW and 350.081 respectively and 41 buses are below the IEEE standard level, the bus selected for SVC connection is at bus 82. By using appropriate size and location of SVC with PSO the size is 2500.51KVAr and connected at bus 82. After integration of static Var compensator real and reactive power loss is reduced to 229.208kw and 216.722kvar respectively. Following this integration, the feeder's real and reactive power loss was reduced by 43% and 38% respectively, resulting in an annual cost reduction of 4,828,929.37 birr for energy loss. This demonstrates that SVC is integrated in the feeder at the optimal size and placement; 3,628,359.72 birr may be saved annually.