Power Quality Improvement in Power System Network using Unified Power Flow Controller

Electric power system regularly face disturbances due to its dynamic nature and also high power quality is the big difficulty due to greater amount of non linear loads. So there is need to restrict these disturbances and mitigates the issues of power quality to improve its performance. Flexible Alternating Current Transmission System (FACTS) plays a key role to enhance power handling capability and control of AC transmission systems. Unified power flow controller is the latest fact device which combines both series and shunt compensator properties and it is capable of controlling reactive and active power of transmission lines. In this paper, UPFC is used to reduce voltage sags and swells. Circuit model of UPFC is designed on the basis of rectifier and inverter circuits. Real and reactive powers changes at the receiving end by changing the control angle. Matlab/Simulink environment is used to enhance power quality by the application of UPFC. The results of simulation are given to validate the performance of UPFC.