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

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Abstract
In this paper, a new optimal pulse-width modulation (PWM) scheme for a three-level quasi-switched boost T-type inverter (TL qSBT2I) 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 the paper. The PWM control algorithm for the fault-tolerant qSBT2I 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 qSBT2I are presented. A laboratory prototype was built to verify the operating principles of the qSBT2I with the proposed modulation scheme before and after fault conditions.

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