الفهرس 
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Abstract
The Low frequency oscillations (LFOs) have an effect on small signal stability of power system. As power system started to operate near the stability limits, may lead to system instability. Power system stabilizers (PSSs) are provided with automatic voltage regulator (AVR) to damp effects of LFOs. This thesis studies the effect of LFOs in single synchronous machine as an example of the synchronous generators on the grid. This thesis studies the common model of PSS including AVR, thyristor high gain exciter, and synchronous generator. In this thesis a conventional controller has been used to stabilize the power system in case of disturbances that may occur due to the load change, and excitation source vibrations. As a fuzzy control draw great success in the last few decades a type one fuzzy control has been proposed to improve the performance of PSS. Since PSS may face high levels of uncertainties that can affect the operation. There is a need to develop different approaches that can handle the available uncertainties and reduce their effects. Hence, an interval type-2 fuzzy control is proposed to overcome the effect of these noises. MATLAB/SIMULINK program is proposed to compare between conventional power system stabilizer (CPSS), fuzzy logic power system stabilizer (FLPSS), and interval type-2 fuzzy logic power system stabilizer (IT2FLPSS) by using different disturbance scenarios including low and high levels of uncertainties.