Small signal stability analysis of dynamic power system with two generators

In this study, stability of two different dynamic systems consist of one and two synchronous generator connected to infinite bus have been analyzed against small signal which is low amplitude and low frequency.Different degrees in varous simplified models of synchronous generator is purposed and used in the literature for use in studies of dynamic stability of power systems. The most widely used model is third order model of synchronous generator which is taken into rotor dynamics in addition of stator dynamics and is neclected stator resistance (rs) and change of flux ( ve ).In this study; unlike the studies in the literature, t-model of synchronous generator without neglecting stator resistant and change of flux is used and dynamic model of systems of connected infinite bus with one and two sycnhronous generator were simulated in Matlab /Simulink program. Otherwise in this study fuzzy logic based power system stability controller whith a rabust structure which can?t lose performance in the event of change of system parameters such as operation point and line impedance at the power system is designed. Because PSS which is designed using the linearized model in order to improve the stability of synchronous generator in literature.System with fuzzy logic controller and traditional power system stabilizer and only system with AVR performances were compared across the small signal disturbance.Key Board: Power system stability, fuzzy logic kontrol, PSS, AVR, small signal stability