A Carrier-Based PWM for Three-Level T-Type Inverter to Tolerate Open-Circuit Fault

This paper investigates the open-circuit faults of switching devices in the three-level T-Type inverter and proposes a new tolerant control method. The three-phase current and variation of the neutral-point voltage are detected to determine the fault switch. A carrier-based pulse width modulation is...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2018-10, Vol.33 (10), p.8787-8796
Main Authors: Lee, Tzung-Lin, Li, Bing-Feng, Yang, Meng-Ying, Tsai, Yue-Ting
Format: Article
Language:English
Subjects:
Capacitors
Circuit faults
Electric potential
Fault tolerant control
Inverters
Low pass filters
Modularity
Modulation
neutral-point voltage control
Phase current
Power harmonic filters
Pulse duration
Pulse duration modulation
Space vector modulation
Switches
Switching
three-level T-type inverter
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Summary:This paper investigates the open-circuit faults of switching devices in the three-level T-Type inverter and proposes a new tolerant control method. The three-phase current and variation of the neutral-point voltage are detected to determine the fault switch. A carrier-based pulse width modulation is developed to tolerate switch fault by transiting from three-level to two-level switching. This makes the modulation scheme easier to be implemented compared to space vector modulation. For the neutral-point fault, the fault phase is operated by two-level modulation to produce the same rating voltage. On the other hand, the inverter is able to produce balanced voltage with reduced rating by keeping the phase of half-bridge fault to the neutral-point voltage. The neutral-point voltage is also able to be balanced by using two-level modulation since it does not contribute the neutral-point current. The performance and effectiveness of the proposed tolerant control are verified by a laboratory build.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2779472