With the increase of doublyfed induction generator (DFIG) wind capacity connected to power grid, the stability of power grid was much related to the parameters of wind converter controllers, and wind turbine converter parameter setting must consider smallsignal stability of grid. The smallsignal model of wind turbine and infinite power grid under all possible wind speeds was established. The smallsignal stable mathematical state equations were established respectively in maximum power tracking zone, constant speed zone and constant power zone by Lyapunov linearization method. Index of stability margin was introduced to evaluate the smallsignal stability of grid, and the parameters setting method was proposed with considering the relevance between wind turbine controller parameters and eigenvalues which could maintain the smallsignal stability of grid under different wind speeds. Simulation results showed that suitable parameters of wind converter could be obtained by the proposed method to maintain the stability of power grid under all of the possible wind speeds.