4.8 Article

Impedance Characteristic Analysis and Stability Improvement Method for DFIG System Within PLL Bandwidth Based on Different Reference Frames

期刊

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 70, 期 1, 页码 532-543

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3150092

关键词

Phase locked loops; Doubly fed induction generators; Impedance; Power system stability; Rotors; Voltage control; Voltage; Different reference frames; doubly-fed induction generator; phase-locked loop; stability improvement method

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This paper investigates the stability of doubly fed induction generator (DFIG) systems under different reference frames using an equivalent single-input single-output impedance model. It is found that DFIG systems implemented in the virtual reference frame or alpha beta-frame exhibit greater stability compared to the synchronous reference frame. To further enhance system stability, this paper proposes a method to emulate the virtual reference frame in the synchronous reference frame and validates its effectiveness through experiments.
The phase-locked loop (PLL) will have a negative impact on the stability of doubly fed induction generators (DFIG) system under inductive weak grid. Some PLL-less methods have been presented to remove the PLL such as switching the synchronous reference frame to the virtual reference frame or alpha beta-frame. Based on the equivalent single-input single-output impedance model, it is found that the DFIG systems implemented in the virtual reference frame or alpha beta-frame are more stable than synchronous reference frame. The reason is that the stator voltage will disturb the reference current calculation of the virtual reference frame and alpha beta-frame, then introduce a reference calculation matrix G(cal). This matrix will keep the phase of DFIG system always -90 degrees around fundamental frequency, then narrow the negative resistance band and enhance the phase margin (PM). In order to further illustrate the stability improvement caused by G(cal), this article proposes a stability improvement method by emulating the G(cal) in synchronous reference frame, so as to improve the PM while retaining the advantages of PLL under unbalanced or harmonically distorted voltage, and fault ride through. The experimental results validate the aforementioned conclusions.

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