With the development of clean energy in the electric power system，wind power has been utilized in large scale , but its characteristics will deeply affect the stability of the power system. This paper compared the wind turbine structure of the doubly-fed induction generator (DFIG) and direct drive synchronous generator (DDSG), and analyzed their reduced order model. Wind power turbines were added to the system of two regional systems. The systems had good damping properties, but the systems' damping model was changed significantly. When wind power generator capacity increased in the system, doubly-fed induction generator could weaken the new local oscillation mode damping. Direct drive synchronous generator could enhance the region associated with a local oscillation damping.