The invention discloses a dead-time compensation method for an NPC-based three-level SVPMW (
space vector pulse width modulation)
rectifier. The method comprises the following steps: firstly, computing the general expression of a dead-time-free reconstitution
voltage impulse by not considering tube
voltage drop and the general expression of a dead-time reconstitution
voltage impulse by considering the tube
voltage drop to obtain a general expression of reconstitution voltage impulse compensation amount; then, selecting the general expression of the reconstitution voltage impulse compensation amount, which corresponds to three-phase voltage, according to the directions of all phase current and the timing sequence states of all phase voltages to work out
voltage compensation amount; finally, feeding back the worked out
voltage compensation amount to a reference
voltage vector before being reconstituted, and performing compensation. According to the dead-time compensation method disclosed by the invention, by adopting a novel compensation amount
selection method, the compensation amount is computed during a voltage reconstitution process, and compensation participated control is performed on the reference
voltage vector;
dead time and the tube
voltage drop are fully considered, and therefore voltage and current
distortion problem generated by the dead-
time effect in the NPC-based
rectifier is solved, and the
system performance is improved.