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This paper presents an enhanced control strategy for the DFIG-based wind turbines under unbalanced and distorted grid voltage conditions. An integrated mathematical model of DFIG is set up, based on which four alternative control targets and their corresponding rotor current references are calculated and assigned. A novel current controller, consisting of a conventional PI regulator and a dual-frequency...
This paper presents a mathematical model of a doubly fed induction generator (DFIG) in the positive synchronous reference frame under distorted grid voltage conditions. The oscillations of the DFIG's electromagnetic torque and the instantaneous stator active and reactive powers are fully described when the grid voltage is harmonically distorted. Four alternative control targets are proposed to improve...
This paper presents a novel vector control strategy for the doubly-fed induction generator (DFIG) based wind turbine during grid voltage dips or swells. The transient electromagnetic process of the DFIG during the grid fault is discussed in detail. An improved control scheme with the dynamic process of stator excitation current variation taking into account is presented. Besides, the main magnetic...
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