Enhancement of Voltage Stability and Loss Minimization Based on FACTS Devices Using Interline Power Flow Controller (Case Study Area: Butajira Distribution Substation)

Abstract

Power system is subjected with various type of interruption, due to rapidly increasing the demand of electricity, internal and external factors and interconnected power systems network complexity. Due to these challenges the power system stability has been affected and loss of the power system increase from generation to distribution system, and also difficulties to the system operation, planning and maintenances scheduling. These kind of problems are found in Butajira substation distribution network. To solve these kind of problems, building new distribution substation and network reconfiguration is difficult. Flexible Alternating Current Transmission System device can enhance voltage stability and loss minimization during disturbances. From the FACTS device in this thesis interline power flow controller is enhancing voltage stability and loss minimization for distribution network by controlling distribution network parameters. It compensate real and reactive power by injecting voltage to the line of distribution networkwith the quadrature of line current. Modeling and analysis of Interline power flow controller with and without faulted outgoing feeder line has been carried out based on proportional integral controller by using MATLAB Simulink software. From the simulation result the system at faulted condition without IPFC the voltage below 20kv and the current increased from 100A to 1500A at 33kv feeder also active and reactive power increased 4.8MW to 21MW and 2.736 to 48Mvar respectively. The system with IPFC during faulted condition the current increased from 100A to 200A at fault occurring line and remain constant all other outgoing lines. Also, active and reactive power increased 0 to 9MW and 0 to 8.04Mvar respectively. From thisobserved that system voltage has become more stable, the power transferability has increasedfrom 5.4 to 5.88MW the system with IPFC and loss of the system also decreased.