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In present days the Multi level inverter increasing popularly especial in high power and high voltage applications. The Multi level inverter having new set of features. When the level is increasing and output become nearly sinusoidal. When the sinusoidal means the output voltage having less losses the more levels of output voltage produces different methods is there the cascade H bridge is the most efficient method .In my project cascade H bridge used to producing more levels of output voltages in cascade H bridge. In this cascade H bridge two types of arrangement they are symmetrical and asymmetrical .In this cascade H bridge I find out experimentally that the asymmetrical Multi level inverter is most efficient method than the symmetrical method by using DTC technique. The DTC technique provides ripple losses and friction losses reduce. So the induction motor having the most efficient .Here we are using IGBT switching and for the controlling purpose uses the state vector modulation. The cascade out experiment show that an asymmetrical configuration provides nearly sinusoidal voltages with low distortion using less switching devices moreover torque ripples are reduced.

Design and Optimum Arrangement Of 3-phase Cascade Multilevel Inverter for Control of DTC Induction Motor