Analysis and research on the fault-tolerant performance of the high-frequency isolated energy conversion link for an integrated distribution transformer system

• Main Authors: Qingshan Wang, Deliang Liang, Yibin Liu, Qixu Chen, Mingkang Zhang
• Format: Article
• Language: English
• Published: Wiley 2019-04-01
• Series: The Journal of Engineering
• Subjects: transformer windings; high-frequency transformers; fault diagnosis; fault tolerance; power transformers; power convertors; HF transformer; multiarm converters; operation process; open-circuit fault; power electronic switching devices; fault characteristics; redundant transformer windings; IDTS; fault-tolerant performance; high-frequency isolated energy conversion link; integrated distribution transformer system; fault-tolerant topology
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8438
• ISSN: 2051-3305

In order to enhance the stability of the integrated distribution transformer system (IDTS), a fault-tolerant topology of the high-frequency (HF) isolated energy conversion link which features a multi-winding HF transformer and two multi-arm converters are proposed in this paper. The operation process of the HF-isolated energy conversion link with an open-circuit fault in the power electronic switching devices is analysed in detail, and the fault characteristics are researched. Through modifying the operation modes of the proposed topology, the damaged part of the circuit can be replaced with the redundant transformer windings and bridge arms, maintaining the continuous operation of the IDTS. The theoretical analyses are verified by the simulated operation waveforms.