Design, simulation and implementation of a UPFC (unified power flow controller) for transmission line model

Abstract

Generally the power system is frequently faced various disturbances. These disturbances will cause to create harmonics and oscillations in the system which lead to operate protection relays. Further this will cause to create a total system failure. Different techniques and devices are used in order to control these power system oscillations and improve the power quality. One of the techniques is use of FACT (flexible alternating current transmission system) devices. FACT devices improve controllability of power system operation. The unified power flow controller (UPFC) is one of the recently founded FACT device which is constructed using modern power electronics technology to control the active and reactive power of the power system. Developing an UPFC for transmission line model and analyzing impact on power quality on transmission line in abnormal conditions would be presented in this paper. Moreover, MATLAB/Simulink models for subsystems of the UPFC are also developed to create a simulation model of UPFC with transmission line model.