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This paper compares PSS based various controller structures on a single machine connected to infinite bus system. The controllers hold the types of PID, PD, PI, and lead-lag controllers. These controllers were tuned by a technique called Particle Swarm Optimization (PSO). The PSO was undertaken for multiple operating points related to the system in order to find a global solution. The simulation results had shown that the PSO optimized the PSS based PID controller structure has achieved the best performance in stabilizing the system when a disturbance occurred.