The Effect of Power System Stabilizers (PSS) on Synchronous Generator Damping and Synchronizing Torques

Abstract

The synchronizing and damping torque coefficients in the range of theelectromechanical oscillation frequencies provide a measure of thegenerators' contribution towards power system stability under smalldeviations, and may be taken as stability indices even for multi machinesystems, although their interpretation is rather complex in this case. Thispaper presents the effect of Power System Stabilizer (PSS) on thesynchronizing and damping torque coefficients for a synchronous generatorconnected to an infinite busbar through impedance; it explicitly includes theeffects of its Automatic Voltage Regulator (AVR) and of the additionalstabilizer signal derived from the rotor speed. .Results obtained were compared with the conventional (AVR) usingMATLAB 7 programming language.