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Cited by 45Advanced DC-DC ConvertersMultilevel Inverters and ConvertersHVDC Systems and Fault Protection

Hybrid-Frequency Cascaded Full-Bridge Solid-State Transformer

Open access
Zhang, Xueyin, Xu, Yonghai, Long, Yunbo, Xu, Shaobo, Siddique, Abubakar·2019·IEEE Access
DOI 10.1109/access.2019.2898985
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Abstract

Modular solid-state transformers (SSTs) are suitable for various voltage- and power-level applications. State-of-the-art modular-SST topologies contain a considerable quantity of high-frequency transformers (HFTs) and power switches, thereby increasing the costs, difficulty, and workloads of engineering. To overcome this challenge, a new SST topology family, namely, hybrid-frequency cascaded full-bridge SST (HCFB-SST), is established on the basis of the concept of hybrid-frequency modulation. In comparison with modular-multilevel converter SST (M2LC-SST) or CFB-SST, the HCFB-SST uses only 50%-66.7% and 1.11%-10% the device count of power switches and HFTs, respectively, in typical applications, thereby obtaining considerable cost savings. It also achieves a cost reduction of sub-module redundancy. In addition, HCFB-SSTs have simple engineering and compact structures. A hybrid-frequency modulation method is proposed for a low well-balanced average switching frequency and a high equivalent switching frequency without monitoring the bridge-arm current. Analysis and comparison of the semiconductor loss with existing topologies are presented. The simulation studies are conducted to validate the effective function of HCFB-SST and the proposed modulation method.

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  • SST is proposed for the wind energy conversion system due to reduction of weight and volume, voltage step-up, and extra functions such as reduction in voltage fluctuation, voltage regulation, and reactive power compensation, which improves PQ events.

    “A few major factors that the SST being proposed for the wind energy conversion system (WECS) are the reduction of weight and volume, voltage step-up and the extra functions that SST could offer such as reduction in fluctuation of voltage, voltage regulation, and compensation of reactive power which results in the improvement of PQ events [4], [83]- [85].”

    From State of the Art of Solid-State Transformers: Advanced Topologies, Implementation Issues, Recent Progress and Improvements (2020) · cites this paper as [4]

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Cited by

Sorted by citations

Authors
Zhang, X., Xu, Y., Long, Y., Xu, S., & Siddique, A.
Affiliations
North China Electric Power University (CN)
ORCID
Venue
IEEE Access
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Published
2019
Volume
7
Pages
22118-22132
ISSN
2169-3536 (ISSN-L)
DOI
10.1109/access.2019.2898985
OpenAlex
W2914915336
Cited by
45
References
1
Citations by year
2026: 5 · 2025: 5 · 2024: 5 · 2023: 9 · 2022: 4 · 2021: 5 · 2020: 8 · 2019: 4
FWCI
1.89
Type
journal article
Language
en
Open access
Licence
ieeexplore.ieee.org/Xplorehelp/downloads/license-information/OAPA.html (vor)
Locations
  • IEEE Access (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Natural Science Foundation of Beijing Municipality (3172036)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced DC-DC Converters
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Multilevel Inverters and Converters
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › HVDC Systems and Fault Protection
Keywords
solid-state transformer, semiconductor switching losses, modular multilevel converter

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