Assessment of PSS Performance for Damping Low Frequency Oscillations in power system

Abstract

The power system consists of a number of synchronous generators in different power stations that rotate at synchronous speeds to feed the required loads in case of the stability. However, when these loads change or fault occurs that cause the swing of these machines due to inequality of input and output capacity of generators, the effect of this oscillation may transfer from one machine to another through the network of the system, which leads to increase the oscillation of some machines and system blackout or damping this swing and return to stability by using one of the damping controller. In this research, the performance and efficiency of Power System Stabilizer (PSS) was studied by applying it to (3-machine 9-bus) by finding the eigenvalues and time domain simulation under different operating conditions represent the system’s response to low oscillations which came from low change in mechanical input capacity, The results of eigenvalue analysis and time domain proved efficient and effective of PSS in enhancing stability and increasing the percentage of damping ratio