Control of a wind turbine with DFIG

The control methods for a DFIG-based WTS are shown in Figure. Below maximum power production, the wind turbine will typically vary the rotational speed proportional with the wind speed and keep the pitch angleθ fixed. At very low wind speed, the rotational speed will be fixed at the maximum allowable slip to prevent over voltage of generator output. A pitch angle controller is used to limit the power when the turbine output is above the nominal power. The total electrical power of the WTS is regulated by controlling the DFIG through the rotor side converter. The control strategy of the grid side converter is simply just to keep the dc-link voltage fixed. It is noted that a trend is to use a crowbar connected to the rotor of DFIG to improve the control performance under grid faults.

Source:
Frede Blaabjerg and Ke Ma “Future on Power Electronics for Wind Turbine Systems” IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 1, No. 3, September 2013




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