Residual-Changing-Rate Based Open-Circuit Fault Diagnosis for A Single-Phase Cascaded H-Bridge Rectifier

被引：0
|
作者：
Xie D. [1 ,2 ]
Ge X. [2 ]
机构：
[1] Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of Education, Southwest Jiaotong University, Chengdu
[2] School of Electrical Engineering, Southwest Jiaotong University, Chengdu
来源：
Ge, Xinglai (xlgee@163.com) | 2018年 / China Machine Press卷 / 33期
关键词：
IGBT open-circuit faults; Mixed logical dynamic (MLD) model; Single-phase cascaded H-bridge rectifier (SPCHBR); The change rate of current residual;
D O I：
10.19595/j.cnki.1000-6753.tces.180484
中图分类号：
学科分类号：
摘要：
To realize the real-time diagnosis for IGBT open-circuit faults in a single-phase cascaded H-bridge rectifier (SPCHBR), a residual-changing-rate based fault diagnosis method is proposed. Firstly, a mixed logic dynamic (MLD) model of the SPCHBR was established to generate the residual of the grid current. Then, combining the theoretical calculation with the simulation results, the residual characteristics for different IGBT faults were analyzed. According to the change rate of current residual, the normalized diagnostic variables were defined for different IGBT faults under the isolation of specific driving signals. Finally, the detection threshold was chosen to accomplish fault location for the single or multiple IGBT open-circuit faults in different modules. The proposed method does not require additional sensor, and the diagnostic signals all come from the control system. Furthermore, the diagnostic method has fast diagnosis speed, and it is robust against false alarms for the transient changes of grid voltage, load and operation mode without changing other parameters. Test results in the hardware-in-the-loop (HIL) system have illustrated the validity and feasibility of the proposed method. © 2018, Electrical Technology Press Co. Ltd. All right reserved.
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页码：3822 / 3834
页数：12
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