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Providing a sinusoidal line current with few low-order harmonics is important for power converters. First, the influence mechanisms of multifactors for the line current distortion in single-phase three-level neutral point clamped converters are analyzed in theory. Second, the corresponding compensation methods for various factors are discussed, respectively. Particularly, the phenomenon that deadtime...
This paper examines the accuracy of the zero-order hold (ZOH) model of the digital pulsewidth modulator (DPWM). The influence of the computational delay on the precision of this equivalent DPWM model is discussed in detail. A compensation method is proposed to compensate the deviation of this DPWM model for accurately calculating the stability region with different computational delay and duty-cycle...
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