Modelling and Simulation of Three Level VSI-Neutral Point Balancing -Fed AC Drive using Intelligence Techniques

Multilevel inverter topology has developed recently as a very important alternative in the area of high power\ud medium voltage energy control. In multilevel inverter, thethree basic types of topologies used are diode clamped\ud inverter (neutral point clamped), capacitorclamped (flying capacitor) and cascaded multi cell with separate dc\ud sources. Multilevel inverters are used in medium voltage and high power applications with less harmonic\ud contents. This paper proposes a software implementation of neutral point clamped (NPC) three level voltage\ud source inverter using space vector pulse width modulation (SVPWM) techniques. The inverter feeds an\ud electrical system which is controlled by field oriented control (FOC).The improvement of the control technique\ud is achieved using intelligence techniques. The operation of the electrical system is verified in steady state and\ud transient state responses. This software implementation is performed by using matlab/Simulink software. This\ud paper gives comparison between SVPWM three phase three level with neutral point clamped and without\ud neutral point clamped. Finally, the comparative study of different techniques was implemented