An Improved Frequency-Adaptive Virtual Variable Sampling-Based Repetitive Control for an Active Power Filter

Dong Liu (), Baojin Li, Songtao Huang, Linguo Liu, Haozhe Wang and Yukai Huang
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Dong Liu: School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China
Baojin Li: School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China
Songtao Huang: School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China
Linguo Liu: School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China
Haozhe Wang: School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China
Yukai Huang: School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2022, vol. 15, issue 19, 1-20

Abstract: To eliminate the harmonics caused by nonlinear loads, repetitive controllers are widely applied as current controllers for active power filters (APF). In practice, a variation in grid frequency leads to the appearance of a fractional-order delay filter. As a result, the resonant frequency of the repetitive controller will deviate from the fundamental frequency and the controller cannot compensate for harmonics accurately. To solve this problem, an improved frequency-adaptive repetitive controller based on virtual variable sampling (IMFA-VVS-RC) for APF is proposed in this paper. To enhance the system stability margin, the proposed RC introduces an infinite impulse response (IIR) low-pass filter. The proposed RC has a high stability margin at high frequencies due to the low gain of the IIR low-pass filter in the region above the cutoff frequency. In this way, the influence of model uncertainty and parameter uncertainty on system stability are reduced at high frequencies. At the same time, compared with the conventional repetitive controller (CRC), the proposed RC for APF has a better harmonic suppression ability when the frequency varies. Experiments have verified the effectiveness of the scheme adopted for APF.

Keywords: active power filter; harmonics compensation; repetitive controller; frequency-adaptive control; system stability margin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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