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Open-Switch and Open-Clamping Diode Fault Diagnosis for Single-phase Five-Level Neutral-Point-Clamped Inverters

Abstract : In this paper, a fast and efficient open-circuit switch and clamping diode fault diagnosis for Neutral-Point-Clamped inverters is proposed. Multilevel converters employed in safety-critical applications should include fault tolerant capability, where fault diagnosis plays a vital role. The proposed fault diagnosis algorithm is based on failure mode analysis, which is a logic based approach. The required signals and measurements are available in the healthy control system. Furthermore, component modeling, load parameters and complicated calculations are not required. The fault detection and identification of the faulty switch or clamping diode are carried out based on the available data such as switching pattern and terminal voltage. Although switches are more fragile than clamping diodes, clamping diodes are also subjected to breakdown. Hence, it is also crucial to achieve a clamping diode fault diagnosis strategy. Moreover, for fault detection procedure, a voltage quantifier is proposed to avoid any misdiagnosis arising from measurement errors and voltage drop in the circuit. The simulation and experimental results are presented to validate the effectiveness of the proposed approach.
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https://hal.univ-lorraine.fr/hal-03228179
Contributor : Bernard Davat <>
Submitted on : Monday, May 17, 2021 - 7:43:57 PM
Last modification on : Tuesday, May 18, 2021 - 10:48:10 AM

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Sajjad Ahmadi, Philippe Poure, Shahrokh Saadate, Davood Arab Khaburi. Open-Switch and Open-Clamping Diode Fault Diagnosis for Single-phase Five-Level Neutral-Point-Clamped Inverters. IEEE Journal of Emerging and Selected Topics in Power Electronics, Institute of Electrical and Electronics Engineers, 2020, pp.1-1. ⟨10.1109/JESTPE.2020.3017923⟩. ⟨hal-03228179⟩

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