Abstract: The doubly-fed induction generator(DFIG) may exhibit negative resistance effects over a wide frequency band due to its control system, which introduces the risk of unstable oscillations to the interconnected system in the corresponding frequency band. The existing studies usually adopt the small-signal linearization method to establish the analytical impedance models of the DFIG, and the DFIG is partially simplified during the modeling process. Therefore, these models are difficult to use for a comprehensive investigation of the impedance characteristics of the DFIG. For this reason, a detailed electromagnetic transient simulation model of the DFIG containing the wind turbine, the induction generator, the rotor-side converter and the grid-side converter is built in the electromagnetic transient simulation platform PSCAD/EMTDC, and its detailed impedance model is established using the test-signal method. On this basis, the impacts of the wind speed, the control parameters of the rotor-side converter and the gird-side converter on the impedance characteristics are investigated. The results show that the DFIG's impedance exhibits equivalent negative resistance effects on the left side of the fundamental frequency and around the fundamental frequency, and the impedance's amplitude and phase in the negative resistance band on the left side of the fundamental frequency are influenced by the wind speed and some controller parameters.