Open Circuit Fault Localization in NPC Inverter Fed Induction Motor Drives Using Cost Function and Estimated Voltages

Multi-level inverters (MLIs) are widely employed in numerous power conversion applications due to reduced (dv/dt) voltage stresses on the switching devices. The operational performance of MLI decreases due to frequent switch faults that may lead to system degradation and failure. Hence, reliable fau...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2024-02, Vol.71 (2), p.922-926
Main Authors: Manikandan, R., Singh, R. Raja
Format: Article
Language:English
Subjects:
Circuit faults
Circuits
Cost function
Energy conversion
False alarms
Fault diagnosis
Fault identification
Fault location
Identification methods
induction machine
Induction motors
Inverters
Localization method
Location awareness
Mathematical models
model predictive control
neutral point clamped
switch fault
Switches
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Summary:Multi-level inverters (MLIs) are widely employed in numerous power conversion applications due to reduced (dv/dt) voltage stresses on the switching devices. The operational performance of MLI decreases due to frequent switch faults that may lead to system degradation and failure. Hence, reliable fault identification with an efficient fault switch localization method is mandatory. Deriving unique fault signatures for the individual switch in MLI is significantly complex. This brief proposes a rapid fault identification method using estimated phase voltages and average cost function for an NPC based induction motor (IM) drive system. The proposed approach has the advantages of a simplified structure and robustness against false alarms. The proposed techniques are implemented using MATLAB/Simulink software, and their efficacy is validated with a 3.7 kW IM drive in real time. The results indicate that effective fault diagnostics is taken from 4.2 ms to 15.2 msec.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2023.3310671