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Article

Modeling and Compound Closed-Loop Control of Single-Phase Quasi-Single-Stage Isolated AC-DC Converter

Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
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Author to whom correspondence should be addressed.
Academic Editor: Giovanni Petrone
Appl. Sci. 2022, 12(15), 7886; https://doi.org/10.3390/app12157886
Received: 27 June 2022 / Revised: 28 July 2022 / Accepted: 2 August 2022 / Published: 5 August 2022
(This article belongs to the Special Issue Challenges for Power Electronics Converters)
The single-phase isolated quasi-single-stage AC-DC converter has many virtues, such as high power density and efficiency; however, its grid current closed-loop control has not been solved. This paper aims to solve the remaining gap based on a large-signal model. In this paper, the large-signal model of this converter under triple-phase-shift modulation is built for the first time. It is verified that the built model is a zero-order linear system. Based on this built model, the effect of grid harmonics on this converter grid current is analyzed. The theoretical analysis reveals that the grid voltage low-order harmonics will cause the same order grid current harmonics and only varying the parameters of the filter is not an effective method to solve this problem. For the purpose of eliminating the effect of grid voltage harmonics on the grid current and realizing the zero-error control of the fundamental component of the grid current, a grid current closed-loop control strategy based on the proportional-resonant compound odd-mode repetitive controller is proposed. The operation principle, parameter constraint, and design rule of the proposed compound control strategy are analyzed comprehensively. The theoretical analysis and the compound control strategy put forward in this paper are tested, with detailed experimental results. View Full-Text
Keywords: isolated AC-DC converter; single phase; large-signal model; compound current controller isolated AC-DC converter; single phase; large-signal model; compound current controller
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MDPI and ACS Style

Wu, F.; Hu, G.; Su, J. Modeling and Compound Closed-Loop Control of Single-Phase Quasi-Single-Stage Isolated AC-DC Converter. Appl. Sci. 2022, 12, 7886. https://doi.org/10.3390/app12157886

AMA Style

Wu F, Hu G, Su J. Modeling and Compound Closed-Loop Control of Single-Phase Quasi-Single-Stage Isolated AC-DC Converter. Applied Sciences. 2022; 12(15):7886. https://doi.org/10.3390/app12157886

Chicago/Turabian Style

Wu, Fengjiang, Guangfu Hu, and Jianyong Su. 2022. "Modeling and Compound Closed-Loop Control of Single-Phase Quasi-Single-Stage Isolated AC-DC Converter" Applied Sciences 12, no. 15: 7886. https://doi.org/10.3390/app12157886

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