Distinctive study of UPFC and fault analysis under simulated environment

This paper investigates the dynamic behavior of Unified Power Flow Controller (UPFC) in a nonlinear power system oscillation trajectory. Different control strategies ie. CLF (control Lyapunov function) and Power Oscillation Damping (POD) with residue technique are applied in a simulation model to regulate the oscillation. On a base of 4 machines 11 bus system validity of aforementioned methods are simulated. In the event of a large and small transient fault system behavior is quantified on the basis of power flow and voltage profile on bus. It was clearly observed that UPFC dynamically controls the voltage stability and controlling technique was further enhanced with POD and CLF methods.