In order to improve permanent magnet synchronous generator (PMSG) high voltage ride through (HVRT) capability,a control strategy of permanent magnet synchronous generator of 2.5MW based on the unity power factor control is applied during steady and the control of reactive power prioritized is applied during grid transient fault.Based on the voltage swell transient characteristic of PMSG ,the model of chopper and super capacitor energy storage system were set up in Matlab/Simulink.The two different transient characteristic were simulated and compared. The result shown that,the two different circuits can be implemented when grid voltage swell occurs and using the super capacitor energy storage system can not only enhance the HVRT capability of PMSG ,but also improve the operation stability after HVRT.