Wind turbines mostly use asynchronous generator and would produce a series of power quality problems such as voltage fluctuations at grid-connected generation. Through the analysis of mathematical model of the wind asynchronous generator and cascade STATCOM, puts forward the parallel cascade STATCOM in the export of wind farm to solve the problem of voltage stability of grid-connected generation. Simulation results show that the method effectively and quickly solves the problem of grid-connected voltage stability and improves the low voltage ride-through capability and fault recovery capability.