Abstract
In this paper, detrimental effects of conventional dead-time based control of multilevel power inverters for high frequency and high power density are analyzed. To mitigate these effects, a compensation technique is proposed based on a voltage-based control. Apparent Switching Frequency Doubling (ASFD) carrier-based pulse-width-modulation (PWM) is considered for the control of a 5-Level Active-Neutral-Point-Clamped (ANPC) II type WBG inverter, and the conventional dead-time and dead-time compensation are applied to this topology. In the conventional dead-time method, since an error of its phase voltage can be generated according to its current direction, the system output can be reduced accordingly and its current total harmonic distortion (iTHD) can also be increased. In addition, the three-phase output voltages have a significant voltage error. The proposed dead-time compensation can significantly improve the current quality by eliminating the error of each phase voltage. Each phase voltage and current distortion were compared and analyzed for the 5-Level ANPC II type WBG inverter with the conventional dead-time and proposed dead-time compensation method. The proposed technique and results were verified through simulation and experiment.
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