Reliability Improvement of a T-Type Three-Level Inverter With Fault-Tolerant Control Strategy

Reliability Improvement of a T-Type Three-Level Inverter With Fault-Tolerant Control Strategy

This paper proposes a fault-tolerant control strategy for a T-type three-level inverter when an open-circuit fault occurs. The proposed method is explained by dividing fault into two cases: the faulty condition of half-bridge switches and neutral-point switches. In case of the open-circuit fault in...

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Bibliographic Details
Published in:IEEE transactions on power electronics Vol. 30; no. 5; pp. 2660 - 2673
Main Authors: Ui-Min Choi, Blaabjerg, Frede, Kyo-Beum Lee
Format: Journal Article
Language:English
Published: IEEE 01-05-2015
Subjects:
Capacitors
Circuit faults
Electric potential
Fault tolerance
Fault tolerant systems
Faults
Inverters
Oscillations
Strategy
Switches
Vectors
Voltage
T-type inverter
Fault-tolerance
space-vector modulation
multilevel
reliability
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Summary:This paper proposes a fault-tolerant control strategy for a T-type three-level inverter when an open-circuit fault occurs. The proposed method is explained by dividing fault into two cases: the faulty condition of half-bridge switches and neutral-point switches. In case of the open-circuit fault in a neutral-point switch, two methods will be proposed and compared based on thermal analysis and neutral-point voltage oscillation. The reliability of T-type inverter systems is improved considerably by the proposed algorithm when a switch fails. The proposed method does not require any additional components. Simulation and experimental results verify the validity and feasibility of the proposed fault-tolerant control strategy.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2325891