Influence of Parameters of Power System Stabilizers on Power System Stability and Voltage Recovery Speed

Abstract

This article analyzes the influence of parameters of Power System Stabilizers (PSS) on power system stability and on speed of voltage recovery. The PSS with speed as single input was selected for this analysis, which is performed with the help of time-domain simulations. The effect of varying the gain and the phase compensation of the PSS is observed through the following attributes: critical clearing time (transient stability), damping of oscillations (small-signal stability), and speed of voltage recovery (large and small perturbations). Two power systems from the literature are taken as examples: the case A is a single-machine/infinite-bus system, and case B is a 3-machine/9-bus system. The results for case A show that the influence of the PSS parameters on critical clearing time is very low whereas their influence on the damping of oscillations and the speed of voltage recovery is important. The results for case B show that the PSS parameters can influence the critical clearing times. In this case, the critical clearing times depend on the gain and the phase compensation of the PSS. Therefore, these results indicate that the PSS should be tuned considering its influence on the three analyzed attributes (critical clearing times, damping of oscillations and speed of voltage recovery).