Vector-Based Dead-Time Compensation for Three-Level T-Type Converters


This paper proposes a new vector-based dead-time compensation method for three-level T-type converters. The origins and effects of the dead-time voltage errors are analyzed in detail for different switching commutations and cargo conditions. So as to eliminate the dead-time distortion in each part, a dead-time error voltage vector is introduced to adjust the reference voltage vector relying on load current polarity. The proposed vector-based dead-time compensation scheme has several benefits. 1st, it can be applied to multilevel converters with any variety of voltage levels using any modulation schemes. Second, the heart beat loss issue that is common in typical pulse-based compensation strategies can be eliminated. In addition, the pulse saturation can be mitigated by operating the converters in overmodulation regions. All of those advantages and effectiveness of the proposed vector-based dead-time compensation methodology are verified through each simulation and experimental studies.

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