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Quick diagnosis of short circuit fault in cascaded H-bridge multilevel inverter using FPGA.

Ouni, S. and Zolghadri, M. R. and Rodriguez, J. and Shahbazi, M. and Oraee, H. and Lezana, P. and Schmeisser, A. U. (2017) 'Quick diagnosis of short circuit fault in cascaded H-bridge multilevel inverter using FPGA.', Journal of power electronics., 17 (1). pp. 56-66.


Fast and accurate fault detection is the primary step and one of the most important tasks in fault tolerant converters. In this paper, a fast and simple method is proposed to detect and diagnosis the faulty cell in a cascaded H-bridge multilevel inverter under a short circuit fault. In this method, the reference voltage is calculated using switching control pulses and DC-Link voltages. The comparison result of the output voltage and the reference voltage is used in conjunction with active cell pulses to detect the faulty cell. To achieve this goal, the cell which is active when the Fault signal turns to “0” is detected as the faulty cell. Furthermore, consideration of generating the active cell pulses is completely described. Since the main advantage of this method is its simplicity, it can be easily implemented in a programmable digital device. Experimental results obtained with an 11-level inverter prototype confirm the effectiveness of the proposed fault detection technique. In addition, they show that the diagnosis method is unaffected by variations of the modulation index.

Item Type:Article
Full text:Publisher-imposed embargo
(AM) Accepted Manuscript
File format - PDF (Copyright agreement prohibits open access to the full-text)
Publisher Web site:
Date accepted:07 September 2016
Date deposited:08 November 2016
Date of first online publication:20 January 2017
Date first made open access:No date available

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