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.

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This paper presents experimental results and its assessment of a variable-speed wind power generation system (VSWPGS) using permanent magnet synchronous generator (PMSG) and boost chopper circuit (BCC). Experimental results are obtained by a test bench with a wind turbine emulator (WTE). WTE reproduces the behaviors of a windmill by using servo motor drives. The mechanical torque references to drive the servo motor are calculated from the windmill wing profile, wind velocity, and windmill rotational speed. VSWPGS using PMSG and BCC has three speed control modes for the level of wind velocity to control the rotational speed of the wind turbine. The control mode for low wind velocity regulates an armature current of generator with BCC. The control mode for middle wind velocity regulates a DC link voltage with a vector-controlled inverter. The control mode for high wind velocity regulates a pitch angle of the wind turbine with a pitch angle control system. The hybrid of three control modes extends the variable-speed range. BCC simplifies the maintenance of VSWPGS while improving reliability. In addition, VSWPGS using PMSG and BCC saves cost compared with VSWPGS using a PWM converter.

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