Open-circuit Fault Diagnosis for Parallel Operated Full-bridge Isolated DC-DC Converter
Single-phase power electronic traction transformer (PETT) is the power device to realize higher efficiency and reduction of weight in railway traction system, and parallel operated full-bridge isolated DC-DC converters are an important part of single-phase PETT to realize a stable DC-voltage output....
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| Main Authors: | , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Control and Information Technology
2017-01-01
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| Series: | Kongzhi Yu Xinxi Jishu |
| Subjects: | |
| Online Access: | http://ctet.csrzic.com/thesisDetails#10.13889/j.issn.2095-3631.2017.04.014 |
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| Summary: | Single-phase power electronic traction transformer (PETT) is the power device to realize higher efficiency and reduction of weight in railway traction system, and parallel operated full-bridge isolated DC-DC converters are an important part of single-phase PETT to realize a stable DC-voltage output. In order to ensure the reliability of DC-DC level, in this paper, an open-circuit fault diagnosis method based on state estimator was proposed for open-circuit fault of a single IGBT. Through establishment of mixed logic dynamic (MLD) model and state estimator model, estimator residuals of the DC-DC level were analyzed under normal and faulty conditions. According to the residuals including information of the fault, fault diagnosis was achieved. Finally, the proposed fault diagnosis method was verified in a hardware-in-loop (HIL) experimental platform with RT-LAB simulator. Experimental results show that the diagnosis method can effectively locate the fault switch in four switching cycles after open-circuit fault of IGBT. |
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| ISSN: | 2096-5427 |