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Wind turbine systems have strong nonlinear multivariable with many uncertain factors and disturbances. Making use of the sliding mode variable structure control strategy, letting the system capability as the sliding mode function. The system of loop-speed-control and loop-position-control are designed base on the sliding mode variable structure control, which can make the system quick, steady and do not tremble to enter into sliding mode. Consequently the favorable dynamic characteristic, choke back trouble, the most power coefficient and good generate electricity quality of PMSM wind-generator are ensured. Simulation and examination shows the effectiveness of the proposed methods.