A PWM Scheme for a Fault-Tolerant Three-Level Quasi-Switched Boost T-Type Inverter

Duc-Tri Do, Minh-Khai Nguyen, Thanh-Hai Quach, Vinh-Thanh Tran, Frede Blaabjerg, Mahinda Vilathgamuwa

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In this paper, a new optimal pulsewidth modulation (PWM) scheme for a three-level quasi-switched boost T-type inverter (TL qSBT 2I) under normal and failure modes is proposed. The proposed method reveals its semiconductor fault tolerance capability in open-circuit fault condition situations as described in this paper. The PWM control algorithm for the fault-tolerant qSBT 2I is implemented by selecting appropriate values for the modulation index, shoot-through (ST) duty cycle, and duty cycles of two additional switches. The steady-state analysis and operating principles of the fault-tolerant qSBT 2I are presented. A laboratory prototype was built to verify the operating principles of the qSBT 2I with the proposed modulation scheme before and after fault conditions.
TidsskriftIEEE Journal of Emerging and Selected Topics in Power Electronics
Udgave nummer3
Sider (fra-til)3029-3040
Antal sider12
StatusUdgivet - sep. 2020


  • Inverters
  • Circuit faults
  • Fault tolerance
  • Fault tolerant systems
  • Modulation
  • Legged locomotion
  • Topology
  • Z-source inverter
  • multilevel inverter
  • boost inverter
  • shoot-through
  • single-stage

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