Investigation of a Fault-Tolerant Three-Level T-Type Inverter System

In recent years, a three-level T-type inverter has attracted considerable attention due to its advantages, such as simple structure and higher efficiency. However, the reliability of a three-level T-type inverter is particularly important as increased power switches are used. Therefore, a fault-tole...

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Bibliographic Details
Published inIEEE transactions on industry applications Vol. 53; no. 5; pp. 4613 - 4623
Main Authors Xu, Shuai, Zhang, Jianzhong, Hang, Jun
Format Journal Article
LanguageEnglish
Published IEEE 01.09.2017
Subjects
Bridge circuits
Capacitors
Circuit faults
Fault tolerance
Fault tolerant
Fault tolerant systems
Inverters
isolating circuit
neutral-point (NP) voltage
redundant fourth-leg
Switches
T-type inverter
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Summary:In recent years, a three-level T-type inverter has attracted considerable attention due to its advantages, such as simple structure and higher efficiency. However, the reliability of a three-level T-type inverter is particularly important as increased power switches are used. Therefore, a fault-tolerant three-level T-type inverter is proposed in this paper. Fault diagnosis and fault-tolerant control strategies for power switches both in half-bridge and neutral-point bridge are investigated. Under fault-tolerant operation, redundant fourth-leg is used to balance neutral-point voltage and the low-frequency voltage oscillation is eliminated completely. The fault ride-through capability and high-quality output waveforms can be obtained. The effectiveness of the proposed inverter topology and control methods is validated by the simulation and experimental results.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2017.2697844