An Open-Circuit-Fault Diagnosis Method for Triple Active Bridge Converter
Year: 2026
Type: conference-paper
Abstract: The triple active bridge (TAB) converters play a key role in dc distribution network. However, a large number of power switches are involved, and the risk of open-circuit fault (OCF) increases dramatically. The OCF leads to high current stress and dc bias, threatening the safe power transmission of dc grid. Therefore, the faulty switch should be quickly and accurately located. The existed fault diagnosis (FD) methods require multiple voltage/current sensors and sophisticated mode analysis, which is not suitable in TAB converters. In this article, a hierarchical FD method based on the intrinsic power coupling characteristics is proposed, which enables a robust FD with only one single current sensor. Complicated mode analysis is avoided with the help of artificial neural network (ANN). First, the faulty port identification is realized by monitoring variations in the average inductor current at one specific port. Then, the faulty switch is pinpointed by triggering an active phase shift (APS) modulation in the faulty port. The FD is accomplished within several switching periods. The proposed method does not increase the overall hardware cost or require high computational resources, which is suitable in three-port applications. Finally, the experimental results validate the effectiveness of the proposed method.
Authors: Gaokun Zhou, Yunpeng Fu, Dongyang Wang, Hanyu Wang
Institution: Hefei University of Technology
Language: English
Topic: Advanced DC-DC Converters
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7166647994