In view of the transient stability of wind farm grid connection, based on the basic structure and mathematical model of static synchronous compensator (STATCOM), a power oscillation damping controller with gray wolf optimization algorithm (GWO) has thus been designed, with the parameters of the controller optimized by GWO algorithm to improve the transient stability of the system. Finally, a modeling and simulation analysis is to be carried out of the system by using Matlab/Simulink. Based on the the research on the operation waveform under three-phase grounding short-circuit condition, the results show that the STATCOM damping effect is great, with the oscillation effectively suppressed, and the power quality problem of the wind power grid connected system improved to a certain extent as well.