Novel Fractional-Order Repetitive Controller Based on Thiran IIR Filter for Grid-Connected Inverters

Qiangsong Zhao; Hongwei Zhang; Yang Gao; Shasha Chen; Yan Wang

doi:10.1109/ACCESS.2022.3196776

IEEE Access (Jan 2022)

Novel Fractional-Order Repetitive Controller Based on Thiran IIR Filter for Grid-Connected Inverters

Qiangsong Zhao,
Hongwei Zhang,
Yang Gao,
Shasha Chen,
Yan Wang

Affiliations

Qiangsong Zhao: School of Electronic and Information Engineering, Zhongyuan University of Technology, Zhengzhou, China
Hongwei Zhang: ORCiD; School of Electronic and Information Engineering, Zhongyuan University of Technology, Zhengzhou, China
Yang Gao: ORCiD; School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin, China
Shasha Chen: School of Electronic and Information Engineering, Zhongyuan University of Technology, Zhengzhou, China
Yan Wang: School of Electronic and Information Engineering, Zhongyuan University of Technology, Zhengzhou, China

DOI: https://doi.org/10.1109/ACCESS.2022.3196776
Journal volume & issue: Vol. 10
pp. 82015 – 82024

Abstract

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The proportional-integral multi-resonance repetitive controller (PIMR-RC) can track the reference current signal of the grid-connected inverter without static error, suppress low-frequency harmonic disturbance signals, and have a fast dynamic response. However, when the grid frequency fluctuates, the performance of reference signal tracking and harmonic suppression will decrease. Based on PIMR-RC, this paper proposes a novel fractional-order repetitive controller (NFO-RC) based on the Thiran infinite impulse response (Thiran IIR) filter, which can automatically track the change of grid frequency. Firstly, the frequency domain analysis of PIMR-RC is given. Then, the realization method based on the Thiran IIR filter is designed, and the structure of NFO-RC system is presented. Moreover, the stability and harmonic suppression analysis of NFO-RC system based on Thiran IIR filter are given. Finally, experimental results on a single-phase LCL grid-connected inverter verify the excellent harmonic suppression performance of the proposed NFO-RC system under grid frequency fluctuations.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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