Sub-Module Capacitor Voltage Ripple Suppression in MMDTC-Based PET Using Three-Port Active Bridge

Xiangzheng Cui, Decun Niu (), Qizhong Yan, Dong Wang, Zhenwei Li and Lei Zhang
Additional contact information
Xiangzheng Cui: School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Decun Niu: School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Qizhong Yan: School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Dong Wang: School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Zhenwei Li: School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Lei Zhang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2025, vol. 18, issue 19, 1-20

Abstract: For power electronic transformer (PET) based Modular Multilevel DC-Link Based T-type Converters (MMDTC) with Double Active Bridges (DABs) (namely DABs-based MMDTC-PET), the sub-module capacitor voltages exhibit relatively large ripples. To reduce the voltage ripple of sub-module capacitors, this paper proposes a novel MMDTC-PET structure that utilizes the Three-Port Active Bridges (TABs) to replace the DABs as the isolation stage (TABs-based MMDTC-PET). When the two full bridges of the TAB on the primary side adopt identical phase-shift modulation, the two sub-module capacitors within the upper and lower arms form a parallel connection. This configuration endows the sub-module capacitors with switched-capacitor characteristics, suppressing voltage ripple in the sub-module capacitors and enabling power ripple flow to the secondary side. Meanwhile, by leveraging the characteristic that the AC power components of the upper and lower arm sub-modules have equal amplitudes but opposite phases, these AC power components are mutually canceled on the secondary side of the TAB. Simulation and experimental results verify the effectiveness of the proposed scheme.

Keywords: modular multilevel DC-Link; T-type converter; power electronics transformer; three-port active bridge; switched-capacitor; capacitor voltage ripple (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: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/19/5178/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/19/5178/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:19:p:5178-:d:1761017

Access Statistics for this article

Energies is currently edited by Ms. Cassie Shen

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().