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Current Control and Discretization Analysis of DFIG Based on Pole-Placement

In the case of DFIG (double-fed induction generator) with a low sampling frequency, the current controller designed in continuous-time domain will be affected by discretization errors and digital control delays in the process of digital realization. In response to this problem, this paper first establishes a complex vector model on the rotor side of DFIG to analyze the influence of digital implementation on control effect. Then, by establishing an accurate discretization model, designing a discrete-time current controller with delay considered. Finally, the effect of designed controller is verified by simulation.