Abstract: With the ever-increasing penetration level of wind power,the impacts of wind power on the power systems are becoming more and more significant.Hence,it is necessary to systematically examine its impacts on the small signal stability and transient stability in order to find out countermeasures.As such,a comprehensive study is carried out to compare the dynamic performances of power system respectively with three widely-used power generators.First,the dynamic models are described for three types of wind power generators,i.e.the squirrel cage induction generator（SCIG）,doubly-fed induction generator（DFIG）and permanent magnet generator（PMG）.Then,the impacts of these wind power generators on the small signal stability and transient stability are compared with that of a substituted synchronous generator（SG）in the WSCC threemachine nine-bus system by the eigenvalue analysis and dynamic time-domain simulations.Simulation results show that the impacts of different wind power generators are different under small and large disturbances.