Power quality analysis and mitigation case study using Unified Power Flow Controller

This paper highlights the voltage sag and swell of the power quality issue and Unified power flow controller (UPFC) is used for mitigation. The switching level model is constructed using three phase six pulse shunt and series converters. Both the converters are modeled as back to back voltage source inverters connected with the D.C link are controlled by sinusoidal pulse width modulation scheme. This model is implemented in single machine infinite parallel transmission line system. The detailed UPFC simulation in switching level model is performed in Matlab/Simulink environment. The result shows that UPFC controller is capable of mitigating the voltage sag and swell in the proposed system.