Wideband oscillations caused by the integration of direct-drive wind farms into weak alternating current （AC） power grids seriously affect the safe and stable operation of power grids.To this end，a control strategy based on coordinated impedance sensitivity and the adjustment of additional controller parameters is proposed.Firstly，a sequence impedance model of direct-drive wind farms with different control methods is built.Meanwhile，the impedance sensitivity method is employed to analyze the influence of various control parameters on system stability and identify the dominant turbine groups that affect the grid-connected oscillation characteristics.Additionally，combined with the current spectrum analysis on the feeder of the dominant turbine group，a design strategy for the control parameters in the additional controller of the static synchronous compensator （STATCOM ） is proposed.Finally，a simulation model is built on the MATLAB/Simulink platform for verification.The results show that the additional control strategy can effectively suppress the wideband oscillation phenomenon and improve the stability of the power grid system.