基于残差变化率的单相级联H桥整流器IGBT开路故障诊断

doi:10.19595/j.cnki.1000-6753.tces.180484

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Abstract 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.

Key words： Single-phase cascaded H-bridge rectifier (SPCHBR) IGBT open-circuit faults mixed logical dynamic (MLD) model the change rate of current residual

Received: 02 April 2018 Published: 03 September 2018

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	Xie Dong
	Ge Xinglai

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Xie Dong,Ge Xinglai. Residual-Changing-Rate Based Open-Circuit Fault Diagnosis for A Single-Phase Cascaded H-Bridge Rectifier[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3822-3834.

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