Mitigation of Oscillations in Power System by Using Upfc and Pss

Now a days electrical power consumption has been increased and increasing drastically. So it must be supplied to all the consumers with high reliability and quality. Since the load is unpredicted but only estimated the generation must be equal to load all the times. But due to variations in load there is effect on the power system whether the load is switched on or off suddenly which causes low frequency oscillations in the entire system. Low frequency electromechanical oscillations are inevitable characteristics of power systems and they greatly affect the transmission line transfer capability and power system stability. Power system stabilizers (PSS) along with FACTS devices can help in damping these low frequency oscillations. The objective of this paper is to design an advanced PSS and UPFC damping controller using Swing equation. This paper presents a control scheme, comprehensive analysis and result obtained for the dynamic control of power transmission, damping of oscillations with Unified Power Flow Controller (UPFC) on the basis of theory and computer simulations through MATLAB software. In this paper UPFC is not designed but its controller is designed and the effect of UPFC on the system under the fault condition, disturbances is being verified