Abstract

This paper presents effective rotor current control schemes for a 2.0-MW wind-turbine-driven Doubly-Fed Induction Generator (DFIG) system feeding a three-phase grid under variable wind speed conditions. The control schemes are based on Proportional-Integral (PI) control, Fuzzy logic Control (FLC) and Fuzzy-PI control designs that are proposed to control DFIG rotor current components in order to maximize power efficiency and enhance system response. The proposed controllers are examined in terms of peak overshoot, settling time and steady state error with respect to wind speed variations. The obtained results demonstrate that the proposed FLC and Fuzzy-PI control schemes lead to a remarkable increase in power extraction and significant improvements in system response of rotor current components when compared to the conventional vector control based on standard PI current controllers.

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