Switching Level Modeling and Operation of Unified Power Flow Controller

This proposed work aims at forming a switching level modeling of Unified Power Flow Controller (UPFC) and analyzing its operation. The switching level modeling of UPFC is carried out using high power electronic devices such as IGBT based six pulse shunt and series converters. The operating performance of UPFC is demonstrated on Single Machine Infinite Bus (SMIB) system for different case studies. The real and reactive power tracings in the system are obtained by varying the firing angle of shunt converter and modulation index of the series converter. The simulation study is carried out in MATLAB/Simulink environment. The proposed topology effectively controls the real and reactive power flow in the transmission lines. The proposed model considerably improves the system stability by damping the oscillation during the vulnerable conditions.