The invention discloses a static var compensator (SVG) sequence impedance modeling and control parameter adjustment method, belonging to the field of power system modeling and analysis. The method comprises the steps of: based on a three-phase stationary phase coordinate system, considering a phase locked loop PLL and a reactive power outer ring to establish the impedance modeling of an output positive sequence impedance model of SVG in a constant reactive power control mode, the the impedance sensitivity analysis of the SVG control parameters, and sorting of the SVG control parameters according to the influence of the SSO (Subsynchronous Oscillation) stability parameters, wherein the provided SVG control parameter adjustment facilitates improvement of the stability of grid-connected SSO in the wind power plant, the static var compensator sequence impedance modeling and control parameter adjustment method effectively prevents the risk of subsynchronous oscillation of the reactive powercompensation device from entering the wind power plant, can formulate an SVG control mode and parameter adjustment scheme capable of improving the SSO stability, and can verify the correctness and effectiveness of the impedance sensitivity analysis and parameter adjustment scheme according to the time domain simulation results.