Optimization of Power System Transients in a Multi Machine System using Unified Power Flow Controller

Abstract

For better utilization, the current system is now equipped with Flexible AC Transmission System (FACTS) devices. The Unified Power Flow Controller (UPFC), a multi-machine system coupled FACTS device, is discussed in this work along with its modelling and simulation. The effectiveness of these controllers is evaluated and the results of the minimization of the settling time of power oscillations and transient peaks of line power, bus voltages, and rotor angle between two machines, respectively, for single line to ground and three-phase fault. A thorough analysis shows that a three phase failure is more serious than a single line to ground fault. The findings also suggest that the proposed controller improved the stability of a particular system by reducing oscillations in the power system and stabilizing the test system. In this article, a PI controller approach for UPFC is used to control power flow and voltage at matching buses. The control strategy is evaluated for the IEEE-9 bus power system network using Matlab/Simulink.