On the Impedance and Stability Analysis of Dual-Active-Bridge-Based Input-Series Output-Parallel Converters in DC Systems

Jiajun Yang, Sandro Guenter, Giampaolo Buticchi, Chunyang Gu, Marco Liserre, Pat Wheeler

Research output: Journal PublicationArticlepeer-review

8 Citations (Scopus)

Abstract

Dual-active-bridge-based (DAB-based) input-series output-parallel (ISOP) converters have become increasingly popular due to their promising features made up of the advantages of the modular power electronics and the DAB converter. The modeling of the DAB converter and the DAB-based ISOP converter has been widely explored for control design in order to analyze the stability and improve the performance of the converter itself, such as the voltage balancing and power sharing of DAB submodules. However, the modeling on the impedance of the DAB-based ISOP converter, which can be quite useful for system-level stability analysis and optimization, has not been addressed sufficiently so far. To solve this issue, this article presents comprehensive impedance modeling of the DAB-based ISOP converter, where the output voltage control and the input voltage balancing control are applied to the converter to achieve the equal power sharing of the submodules. The proposed input impedance model and output impedance model of the DAB-based ISOP converter are validated through the frequency-domain sweep in simulation and experiment. With the validated impedance models, the instability phenomenon and the frequency of the main harmonic component in oscillating waveforms can be accurately predicted at the source side and at the load side of the converter respectively.

Original languageEnglish
Pages (from-to)10344-10358
Number of pages15
JournalIEEE Transactions on Power Electronics
Volume38
Issue number8
DOIs
Publication statusPublished - 1 Aug 2023

Keywords

  • Dual-active-bridge (DAB)
  • impedance modeling
  • input-series output-parallel (ISOP) converter
  • stability analysis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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