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Title: Impedance shaping of isolated two-stage AC-DC-DC converter for stability improvement
Authors: Feng, Fan
Wu, Fengjiang
Gooi, Hoay Beng
Keywords: Impedance Shaping
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Feng, F., Wu, F., & Gooi, H. B. (2019). Impedance shaping of isolated two-stage AC-DC-DC converter for stability improvement. IEEE Access, 7, 18601-18610. doi:10.1109/ACCESS.2019.2892080
Series/Report no.: IEEE Access
Abstract: The isolated two-stage ac-dc-dc converter containing an isolated dual-active-bridge (DAB) dc-dc converter and an ac-dc rectifier has been widely used for connecting the dc sources to the ac utility grid. However, the impedance interaction between the DAB converter and the ac-dc rectifier may cause the instability problem. To address this issue, this paper proposes two control methods to reshape the impedances of the isolated two-stage ac-dc-dc converter by building a virtual impedance connected in parallel or series with the input impedance of the DAB converter. The magnitude of the input impedance of the DAB converter is increased to satisfy the Middlebrook criterion without changing its negative resistance characteristics by the proposed control methods. Furthermore, the design requirements for the proposed controllers are also given to ensure the stable operation of the two-stage converter. The comparison of these two proposed methods is also discussed in terms of stabilizing ability, dynamic performance, and cost. The comprehensive experimental results are provided to validate the proposed methods.
DOI: 10.1109/ACCESS.2019.2892080
Schools: School of Electrical and Electronic Engineering 
Rights: © 2019 IEEE. Translations and content mining are permitted for academic research only. Personal use is also permitted, but republication/redistribution requires IEEE permission. See for more information.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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