A modified SVPWM for Z Source NPC Three-level inverter fed Induction motor drive

This paper presents an modified space vector PWM for Z Source Multi level inverter, By using single impedance (Z) network and respective Shoot Through (ST) switching States. Nevertheless, the states of ST limits the modulation index and causes a huge ST current in the inverter phase legs. The Z networks are directly responsible for balancing the inductive boosting voltage and output levels. The existing methods use the full ST which occupies the more switching commutations per cycle and it leads to unequal charging and discharging of inductor, causes more harmonics in the output voltage and currents. This work proposes a development of an enhanced SVPWM technique to balance the charging and discharging of inductors of Z network with DC link capacitors. The proposed method performance has examined with induction motor drive and it is validated in simulation environment