Heliasadat Hosseinian - Faculty of Mechanics Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Soodabeh Soleymani - Faculty of Mechanics, Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Hamidreza Damghani - Faculty of Mechanics, Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Hediyehsadat Hosseinian - Faculty of architecture engineering, South Tehran Branch, Islamic Azad University Tehran, Iran

The power framework is exposed to various sorts of unsettling influences, for example, little changes in the heap that influences its effectiveness and now and then prompts a precarious framework. These unsettling influences cause motions at low frequencies that are unwanted since it influences the measure of exchanged power through the transmission lines and prompts outside worry to the mechanical shaft. So as to pack low-recurrence motions, a typical arrangement is to utilize the power framework stabilizer (PSS).In this paper, the fuzzy PSS design, optimized with Particle Swarm Optimization (PSO) and controller , is used to reduce the small signal fluctuations in a wide range. According to the simulation results, the fuzzy PSS composition optimized with the PSO and the controller has a better performance than the fuzzy PSS optimized by the PSO.

Particle Swarm Optimization(PSO); Power System Stabilizer (PSS); Thyristor Controller Series (TCSC)