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In this paper, the effect of common-mode voltage generated in the three-level quasi-switched boost T-type inverter is minimized by applying the proposed space-vector modulation technique, which uses only medium vectors and zero vector to synthesize the reference vector. The switching sequence is selected smoothly for inserting the shoot-through state for the inverter branch. The shoot-through vector is added within the zero vector in order to not affect the active vectors as well as the output voltage. In addition, the shoot-through control signal of active switches of the impedance network is generated to ensure that its phase is shifted 90 degrees compared to shoot through the signal of the inverter leg, which provides an improvement in reducing the inductor current ripple and enhancing the voltage gain. The effectiveness of the proposed method is verified through simulation and experimental results. In addition, the superiority of the proposed scheme is demonstrated by comparing it to the conventional pulse-width modulation technique.

In this paper, a new optimal pulse-width modulation (PWM) scheme for a three-level quasi-switched boost T-type inverter (TL qSBT 2 I) 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 qSBT 2 I 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 2 I are presented. A laboratory prototype was built to verify the operating principles of the qSBT 2 I with the proposed modulation scheme before and after fault conditions.

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