The power system is a dynamic and highly integrated system. Due to the large scale interconnections and highly nonlinear systems that operate in an uncertain environment where load, generator output, and operating parameter change continuously. So that it is constantly being subjected to low-frequency oscillation due to disturbance. These low-frequency oscillations cause a loss of synchronism and a breakdown of the entire system. The main function of the automatic voltage regulator is to monitor the output voltage of the generator and continuously maintain the constant terminal voltage of generator and hence it improves the transient stability of the power system. A power system stabilizer is used to generate a supplementary control signal for the excitation system in order to damp the low-frequency oscillation. The traditional solution to this problem is the application of a conventional power system stabilizer. The conventional power system stabilizer which uses lead-lag compensation where the gain setting design for the specific operating conditions is giving poor performance under different loading conditions. It is very difficult to design a stabilizer that could present good performance in all operating points of the electric power system. To overcome the drawback of the conventional power system stabilizer numerous techniques have been proposed. When the effect of power system stabilizers in damping of low-frequency oscillations in a multi-machine power system with different load combinations. If various load models considered are constant impedance load, a mixture of constant impedance, and constant current load and mixture of constant impedance and constant power load. The fuzzy logic power system stabilizer for stability enhancement of multi-machine power system. In order to accomplish the stability enhancement, speed deviation, and acceleration of the rotor of the synchronous generator of the multi-machine power system were taken as the input to the fuzzy logic controller.