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To analyze the impact of wind farms on the small signal stability of the integrated power system, first the two integrated induction generators, SFIG and DFIG are presented in this paper based on the induction generators theory. Then introduce the method to analyze the small signal stability of the system by the eigenvalues. The aerodynamic models, mechanical-driven models and pitch angle control system models in DIgSILENT/Power Factory are also presented in the paper to set up the simulation. In the simulation study, a testing system including a DFIG based wind farm and a SFIG based wind farm which are implemented in DIgSILENT/Power Factory are conducted to analyze the impact. The simulation results show that, both integrated SFIG and integrated DFIG can improve the small signal stability of the power system, but the former one contribute to the system more effectively. In lots of influence factors, the output is the main factor.