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

作者：Lee, Tzung Lin^*; Li, Bing Feng; Yang, Meng Ying; Tsai, Yue Ting

来源：IEEE Transactions on Power Electronics, 2018, 33(10): 8787-8796.

DOI：10.1109/TPEL.2017.2779472

• Fault tolerant control
• neutral-point voltage control
• three-level T-type inverter

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 he 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.

• 出版日期2018-10
• 单位中山大学