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With the growing rating of the wind energy generation system, capturing the maximum wind energy and improving the operation efficiency and power quality are becoming more and more important. In Variable Speed Constant Frequency (VSCF) wind energy generation system, the control and design of the grid-side converter is of great importance. This paper expatiates the principle and the mathematic model of the grid-side PWM converter, acquiring the equations of active power and reactive power controlled independently under the d-q frame of axes. The block diagram of the VSCF wind energy generation system with DFIG and the grid-side back-to-back PWM converter is established. Then the fuzzy sliding mode controller is designed suitably. The simulation results show that the grid-side PWM converter adopting fuzzy sliding mode control can adjust power factor and make the current flow flexibly, which realizes the switch between the generation state and the drag state, and the state of the grid-side PWM converter can be held to disturbance and nonlinear variety of load.