1. A Carrier-Based PWM for Three-Level T-Type Inverter to Tolerate Open-Circuit Fault.
- Author
-
Lee, Tzung-Lin, Li, Bing-Feng, Yang, Meng-Ying, and Tsai, Yue-Ting
- Subjects
- *
ELECTRIC circuits , *ELECTRIC inverters , *OPEN-circuit voltage , *FAULT tolerance (Engineering) , *SOLAR energy - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF