DC voltage ripple compensation system and method of process variants based carrier spwm

The present invention discloses a system and a DC voltage ripple compensation method based on the carrier wave is SPWM method; system includes a three-phase bridge arms connected in parallel, each phase arm IGBT tube comprises two series, each phase arm IGBT tube two branches connected to the lead, a different branch comprising two series-connected IGBT control directions, the other branch is connected via a filter and a resistor; each arm at the input of the parallel input access two independent voltage source; the same magnitude independent voltage source, a capacitor connected in parallel, respectively, at the connection point, while two separate voltage sources connected to one end of the tube IGBT two different directions in series three-phase bridge arm, all the IGBT control by the control circuit drives. The present invention contemplates the actual T-shaped three-level DC / AC inverter DC voltage ripple by correcting the feedforward algorithm SPWM modulation wave in real time, compensate for the effect of ripple voltage on the AC side, T-shaped three-level to achieve DC / AC immune converter wide frequency range of DC ripple, to improve the quality of the AC power side of the DC ripple conditions.