Transient Stability Simulation System with PSS Including Wind Farm I.GRICHE 1 , A.GHERBI 2 1 Department of Electrical Engineering, Bouira University, Algeria 2 Laboratory of Automatics (LAS), Department of Electrotechnics, Setif1 University, Algeria { griche_issam@yahoo.fr ; gherbi_a@yahoo.com } Abstract. In order to analyze the transient stability of grid connected doubly fed induction generators (DFIG) in wind power generating systems, various mathe- matical models, including the detailed generator models as well as the one-mass and two-mass shaft system models, are studied in this paper. Based on the differ- ent system models, the dynamic behaviors are simulated by using Matlab/Simulink, under the condition that the machine synchronous is subjected to a three-phase short-circuit fault. In addition the power system stabilizer (PSS) is modeled and compared by simulation for different system at the various operation conditions. The models and methods suitable to analyze the transient stability of the power system including wind turbine systems based on DFIG are discussed in detail. Several comparative results have shown that the valid transient stability model of PSS in power systems. Keywords: Transient Stability, Synchronous Generator, PSS, Wind turbine, Doubly Fed Induction Generator. 1 Introduction Wind energy is now an energy that cannot be ignored. Because of intrinsic characteristics (scattered primary energy, generators with different technologies, use of power electronics interface), the integration of wind energy system in distri- bution grids leads to real problems in terms of impacts. With recent standard changes, it is necessary to study the possibilities of each technology of wind tur- bines to answer or not to these new constraints. In the wind power stations, doubly fed induction generators (DFIG) are commonly used as generators. It is important to analyze the transient stability of power system including wind power farms [l]. PSS is one of the important devices whose effectiveness for voltage control is well known. It has been successfully used to damp out power system oscillations