The primary role of an automatic voltage regulator (AVR) is to regulate the reactive power and voltage magnitude. The system modeled consists of the amplifier, exciter, sensor and stabilizer or proportional-integral-derivative (PID) controller. The state-space technique is used to model the system. Their characteristics and behavior are also briefly discussed. Results of the simulation studies on the AVR system using Matlab are presented. By examining the parameters of the stabilizer and controller, the generator terminal voltage variations are predicted.

The idea of power system stabilizer (PSS) or supplementary excitation control is to apply a signal through the excitation system to produce additional damping torque of the generator in a power system at all operating and system conditions. In this paper the study of the dynamic behavior and transient stability of the single-machine infinite-bus (SMIB) with used the eigenvalue analysis is presented. Finally, the simulation results of system dynamic performance response for PSS parameters variation is achieved and discussed.