Multiple Open Switch Fast Fault Detection and Localization Algorithm for Tolerant CHB-MLI

Fast multiple open circuit fault (OCF) detection and faulty switch localization with a single switch fault-tolerant cascaded H-bridge (HB) multilevel inverter (CHB-MLI) under level-shifted pulsewidth modulation (LS-PWM) are presented in this article. A simple redundant power cell (RPC) structure is...

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Bibliographic Details
Published in:IEEE transactions on transportation electrification Vol. 10; no. 3; pp. 6789 - 6800
Main Author: Kumar, Mayank
Format: Journal Article
Language:English
Published: IEEE 01.09.2024
Subjects:
Cascaded H-bridge multilevel inverters (CHB-MLIs)
Circuit faults
double Fourier integral
Fault detection
fault localization
Fault tolerant systems
fault-tolerant
Location awareness
open circuit faults (OCFs)
Redundancy
Switches
Voltage
ISSN:2332-7782, 2332-7782
Online Access:Get full text
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Summary:Fast multiple open circuit fault (OCF) detection and faulty switch localization with a single switch fault-tolerant cascaded H-bridge (HB) multilevel inverter (CHB-MLI) under level-shifted pulsewidth modulation (LS-PWM) are presented in this article. A simple redundant power cell (RPC) structure is used to make the multilevel inverter (MLI) fault-tolerant. The OCF with a healthy anti-parallel diode is considered for the proposed novel and fast switch fault detection, localization, and tolerant algorithm (FDLTA). The bridge with OCFs can be bypassed either through both upper or lower switches without the addition of any extra semiconductor device with CHB-MLI. Therefore, the exact switch fault localization within the HB is compulsory. The diagonally opposite switch fault signatures within the <inline-formula> <tex-math notation="LaTeX">n </tex-math></inline-formula>th power cell of CHB-MLI are approximately similar for (<inline-formula> <tex-math notation="LaTeX">2n + 1 </tex-math></inline-formula>)-level CHB-MLI, where <inline-formula> <tex-math notation="LaTeX">n </tex-math></inline-formula> is an odd positive integer, and therefore, the diagonally opposite switch fault detection and localization are very difficult. The analytical results for LS-PWM inverter output voltage under OCF conditions are derived using a double Fourier integral solution and Jacobi Anger expansion, and harmonic magnitude spectrum analysis for voltage and load current is presented under OCF conditions. Furthermore, a laboratory-type fault-tolerant CHB-MLI is developed with RPC, and the proposed logic design is tested.
ISSN:2332-7782
2332-7782
DOI:10.1109/TTE.2023.3342160