Fault diagnosis method for cascaded H-bridge multilevel inverter

被引：0
|
作者：
Yu J. [1 ]
Zhang G. [1 ]
Qiu J. [1 ]
Wang Y. [1 ]
Sun J. [1 ]
机构：
[1] College of Automation, Central South University, Changsha
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2023年 / 27卷 / 09期
关键词：
cascaded H-bridge; fault diagnosis; level-shifted pulse width modulation; multilevel inverter; open-circuit fault;
D O I：
10.15938/j.emc.2023.09.013
中图分类号：
学科分类号：
摘要：
A fault diagnosis method based on level-shifted pulse width modulation (LSPWM) technique was proposed to diagnose the switch open circuit fault of cascaded H-bridge multilevel inverter. The output characteristic curves of H-bridge output voltage, load current and driving signal were analyzed directly. When part of the driving signal is disconnected, the corresponding current and voltage have partial loss and fluctuation so as to deduce the corresponding relationship among the three in the case of failure. According to the direction of modulation wave and load current, the system was divided into four working modes, and faults were diagnosed in the specific mode. The characteristic curve of load current crossing zero was analyzed in order to identify the fault of diagonal switch in H-bridge. Compared with the existing methods, the fault range of the proposed method is extended to double tube fault based on LSPWM, and by the diagnostic logic it is easy to understand without additional hardware circuits. Simulation results show correctness and effectiveness the proposed fault diagnosis method. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：119 / 125
页数：6
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