Universal Sensorless Open-Circuit Fault Detection and Isolation Method of Dual-Active-Bridge Converters With Low-Cost Diagnostic Circuit

Shahamat Shahzad Khan, Huiqing Wen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

As one of the promising power interfaces between the energy storage components and the dc link, dual active bridge (DAB) converters have gained extensive researches. Its reliability and healthy operation under one or even multiple unexpected open-circuit faulty conditions have become one of the main design challenges. Conventional fault detection (FD) and fault isolation (FI) methods exhibit obvious limitations in terms of detection speed, number of FD signatures, universality, accuracy, computational burden, and implementation cost due to the added sensors. To fill in this gap, this article presents a robust, fast, accurate, and low-cost FD and FI method for DAB converters, which is applicable under various operational conditions. The proposed method will adopt the differential switch node voltage between the primary and secondary bridge of DAB converters as the universal fault signature for complete FD and FI. The corresponding fault diagnostic circuit is simple, compact, low cost, and easy in implementation. This sensorless fault diagnostic technique can detect the switch open-circuit fault within a quarter of a switching cycle and realize the fault isolation accurately. A DAB prototype with a fault diagnostic circuit was designed, and main experimental results under various faulty conditions were provided to validate the advantages of the proposed method.

Original languageEnglish
Pages (from-to)13652-13667
Number of pages16
JournalIEEE Transactions on Power Electronics
Volume37
Issue number11
DOIs
Publication statusPublished - Nov 2022

Keywords

  • Bidirectional Isolated DC-DC Converters
  • Circuit faults
  • Costs
  • dual active bridge converters
  • fault detection
  • fault isolation
  • Hardware
  • Sensors
  • single phase shift control
  • Switches
  • Switching circuits
  • Voltage measurement
  • fault isolation (FI)
  • Bidirectional isolated dc∞dc converters
  • fault detection (FD)
  • single phase-shift control
  • dual active bridge converters (DABs)
  • Bidirectional isolated dc-dc converters

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