A Real-Time Fault-Tolerant Control Approach to Ensure the Resiliency of a Self-Healing Multilevel Converter

Sajjad Ahmadi, Philippe Poure, Davood Arab Khaburi and Shahrokh Saadate
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Sajjad Ahmadi: Faculté des Sciences et Technologies, Campus Aiguillettes, Université de Lorraine, GREEN, F-54500 Nancy, France
Philippe Poure: Institut Jean Lamour (UMR7198), Université de Lorraine, CNRS, IJL, F-54500 Nancy, France
Davood Arab Khaburi: The Center of Excellence for Power Systems Automation and Operation, Department of Electrical Engineering, Iran University of Science and Technology, Tehran 1311416846, Iran
Shahrokh Saadate: Faculté des Sciences et Technologies, Campus Aiguillettes, Université de Lorraine, GREEN, F-54500 Nancy, France

Energies, 2022, vol. 15, issue 13, 1-16

Abstract: Ensuring service continuity in safety critical applications is crucial. In some of these applications, multilevel converters play a vital role. In this regard, this research work presents a self-healing fault-tolerant control approach to ensure the resiliency of a neutral-point clamped converter when a semiconductor component encounters an open circuit fault. The defective semiconductor can be a power switch or a clamping diode. By applying the proposed real-time fault-tolerance control, the rated output voltage and output current are restored during post-fault operation. Furthermore, the total harmonic distortion value of the output voltage during application of the real time self-healing control does not increase when compared with that during healthy operation. Since the realization of the proposed control strategy does not require any bidirectional switch, a fast transition between the healthy and fault-tolerant operation is accomplished. Moreover, the proposed structure can ensure service continuity in case of a fault event in the anti-parallel diodes, something which has been overlooked in previously conducted research works.

Keywords: fault-tolerant control; converter resiliency; neutral-point-clamped; self-healing; multilevel converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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