Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 47, Issue 6, Pages 2487-2494Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2011.2168800
Keywords
ac motor drives; fault diagnosis; multiple insulated gate bipolar transistor (IGBT) open-circuit faults; voltage-source inverter (VSI)
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Practically all the diagnostic methods for open-circuit faults in voltage-source inverters (VSI) developed during the last decades are focused on the occurrence of single faults and do not have the capability to handle and identify multiple failures. This paper presents a new method for real-time diagnostics of multiple open-circuit faults in VSI feeding ac machines. In contrast with the majority of the methods found in the literature which are based on the motor phase currents average values, the average absolute values are used here as principal quantities to formulate the diagnostic variables. These prove to be more robust against the issue of false alarms, carrying also information about multiple open-circuit failures. Furthermore, by the combination of these variables with the machine phase currents average values, it is possible to obtain characteristic signatures, which allow for the detection and identification of single and multiple open-circuit faults.
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