Critical evaluation of SVPWM scheme for capacitor balancing in NPC-MLI

This paper presents a generalized SVPWM technique to eliminate imbalances in the D.C-link capacitor voltage in 3Level Neutral point diode clamped( NPC) multilevel inverter(MLI), which is one of the main drawbacks of NPC multilevel inverter. Capacitor imbalance is due to the phase currents available in each switching state. By using the proper redundancy switching state the capacitor balance in linear-modultion can be achieved. The redundant state guarantees to achieve voltage balancing with no requirement of any additional control effort. The benefits of the proposed scheme has been verified through the Mat lab simulation and it´s validated in FPGASPARTEN III.