Abstract
Maximum power extraction and constant power generation in a smooth and uninterrupted manner are challenging control tasks for the robust operation of DFIG under grid voltage dips, owing to severe power and torque pulsations. Thus, necessitating tailored power control strategies while curtailing the undesirable effects on DFIG performance under voltage dips. The crux of this paper is to compute the angular stator flux frequency for precise reference power generation and control of DFIG subjected to grid voltage unbalance especially during MPPT operation. The angular frequency of stator flux is computed with the stator voltage and current components in the positive sequence stationary <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">α-β</i> reference frame without the need for a PLL and differentiation of stator voltage vector. Further, the computed stator flux frequency signal is employed for rotor speed computation, and reference power generation for maximum power extraction from DFIG. The efficacy of the proposed method in enabling precise power control of DFIG under unbalanced grid voltage is demonstrated using simulations in PSCAD/EMTDC and further through test results on a 3 hp DFIG test set up. The overall results show enhanced performance of DFIG under MPPT with the proposed scheme.
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