Hybrid Isolated Modular Multilevel Converter Based Solid-State Transformer Topology With Simplified Power Conversion Process and Uneven Voltage Ratio

Zhongchen Pei, Dehao Kong, Chao Liu, Chuang Liu, Dongbo Guo, Di Zhu, Yuanxiang Sun, Marcelo Lobo Heldwein

doi:10.1109/TPEL.2023.3295059

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Title:: Hybrid Isolated Modular Multilevel Converter Based Solid-State Transformer Topology With Simplified Power Conversion Process and Uneven Voltage Ratio
Document type:: Zeitschriftenaufsatz
Author(s):: Zhongchen Pei, Dehao Kong, Chao Liu, Chuang Liu, Dongbo Guo, Di Zhu, Yuanxiang Sun, Marcelo Lobo Heldwein
Abstract:: This article proposes a novel triple-port solid-state transformer (SST) topology based on a hybrid isolated modular multilevel converter (MMC), which overcomes the limitation of voltage ratio R (pu) in the conventional MMC-based SST. By integrating a high-frequency link into the MMC structure and applying various types of isolated submodule (ISM), the proposed SST can function as a step-down rectifier, where U MVDC < U MVAC(p-p) . In this case, the power electronics converters used to connect downstream medium-voltage direct current (MVdc) link and distributed energy resources or battery storage require fewer active devices and may minimize the cost of protection equipment. In addition, the proposed SST retains the significant advantages of single-stage SSTs, such as single-stage power conversion, saving capacitor, and a simple control system. First, the topology and modulation strategy of two types of ISMs are discussed. In addition, this article provides a detailed analysis of operation principles, power flow, grid-tied control, and system reliability. Moreover, the proposed converter is compared with other SST topologies in terms of key performance indicators, such as peak efficiency, system volume, and number of active semiconductor devices. Finally, a 300-V/20-kW scaled-down prototype is developed, and the experimental results demonstrate the performance and verify the correctness of the proposed converter.
Journal title:: IEEE Transactions on Power Electronics
Year:: 2023
Year / month:: 2023-07
Quarter:: 3. Quartal
Month:: Jul
Journal issue:: Volume: 38, Issue: 10, October 2023
Pages contribution:: 12757 - 12773
Reviewed:: ja
Language:: en
Fulltext / DOI:: doi:10.1109/TPEL.2023.3295059
WWW:: https://doi.org/10.1109/TPEL.2023.3295059
Publisher:: IEEE
Print-ISSN:: 0885-8993
E-ISSN:: 1941-0107
Notes:: Funding Agency: 10.13039/501100001809-National Natural Science Foundation of China (Grant Number: 51877035)
Date of publication:: 13.07.2023
Copyright statement:: IEEE
Semester:: SS 23
TUM Institution:: Lehrstuhl für Hochleistungs-Umrichtersysteme
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mediaTUM Gesamtbestand Einrichtungen Schools TUM School of Engineering and Design Departments Energy and Process Engineering Lehrstuhl für Hochleistungs-Umrichtersysteme (Prof. Heldwein)2023 Journal

mediaTUM Gesamtbestand Hochschulbibliographie 2023 Schools und Fakultäten TUM School of Engineering and Design Lehrstuhl für Hochleistungs-Umrichtersysteme (Prof. Heldwein)