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This paper presents the experimental results of variable speed wind power generation system (VSWPGS) using permanent magnet synchronous generator (PMSG). The back to back PWM converters are utilized as converters for the VSWPGS. The experimental results are obtained by the test bench using the wind turbine emulator. The wind turbine emulator are reproduced the behaviors of windmill by the servo motor drives. The mechanical torque reference to derive the servo motor is calculated from windmill wing profile, the wind velocity and windmill rotational speed. The VSWPGS using PMSG employs the vector control system to control the torque and speed of PMSG in the converter side. The windmill rotational speed is controlled to maximize the efficiency of wind turbine against wind speed in low-and middle-range. When the wind speeds exceeds the rated value, the windmill rotational speed and output power are controlled to be the rated values by the pitch angle control system. And the active power and reactive power are controlled in the inverter side, and generated power is sent to the grid-connected power generation while controlling the DC link voltage to be constant at the same time.