ZVS Boundary Analysis and Design Guideline of MV Grid-Compliant Solid-State Transformer for DC Fast Charger Applications

A solid-state transformer (SST) comprising a cascaded H-bridge and a dual active bridge (DAB) converter is a promising solution for a megawatt medium-voltage dc fast charger application. The new IEEE Std 1547.9-2022 comprehensively discusses extending the minimum reactive power capability to electric vehicle chargers. This article analyzes the impact of operating the grid compliant single-phase SST on the overall system. The impact of the dc-link voltage due to the single-phase implementation of the H-bridges on the DAB converter zero-voltage switching (ZVS) mode at light-load operation is highlighted. The system’s operational boundary is analyzed, which defines the reactive power capability limit while ensuring the DAB converter ZVS mode operation for the defined operating points. This ZVS mode boundary analysis is then used to develop a design guideline as part of the SST design process. The proposed guideline allows a simultaneous design of a dc-link capacitor and DAB inductance to ensure the ZVS mode for the defined operating points. It leads to dc-link capacitance reduction that offers cost- and footprint-savings. The proposed concept is validated through simulations and experimental results. Furthermore, a potential benefit analysis is provided to emphasize the effectiveness of the proposed concept. A supplementary video is included to showcase the system’s dynamic active and reactive power operation.

• Record URL:
  • http://dx.doi.org/10.1109/TTE.2022.3229223
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/23327782
• Supplemental Notes:
  • Copyright © 2023, IEEE.
• Authors:
  • Prabowo, Yos
  • 0000-0003-4034-4599
  • Sharma, Shrivatsal
  • 0000-0002-3569-3308
  • Bhattacharya, Subhashish
  • 0000-0001-9311-5744
  • Tripathi, Awneesh Kumar
  • 0000-0001-9493-782X
  • Bhavaraju, Vijay
• Publication Date: 2023-12

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 4964-4980
• Serial:
  • IEEE Transactions on Transportation Electrification
  • Volume: 9
  • Issue Number: 4
  • Publisher: Institute of Electrical and Electronics Engineers (IEEE)
  • ISSN: 2332-7782
  • Serial URL: http://ieeexplore.ieee.org/servlet/opac?punumber=6687316

Subject/Index Terms

• TRT Terms: Battery chargers; Design; Electric vehicle charging; Power converters; Solid state devices; Transformers
• Subject Areas: Design; Energy; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01905551
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 24 2024 4:55PM