Modeling & Simulation of Seven levels Multilevel Inverter fed Induction motor Drive

Abstract

Nowadays, the industries demanding more power with low harmonics for the high power applications. Thus Multilevel Inverter concept is introduced. The concept of the Multilevel Inverters becoming trendier for the high power applications due to less harmonics and high power ratings. The importance of the multilevel converters has been increase since the last decade. The ability to synthesize waveforms for high voltage with better harmonic spectrum, these new types of multilevel converters is suitable for high power applications. Several topologies have been introduced, amongst these topologies, the Cascaded H-bridge Multilevel Inverter is proposed. Also the main concept is Harmonics. So to reduce the harmonics the modulation topologies (PWM techniques) for multilevel inverters are proposed. Three phase induction motors are widely used in Industrial drives because of their ruggedness, reliability and simplicity in construction. Accurate control of Induction Machine was always a matter of concern starting from the modulation technique used, to the closed loop control strategy. In this work a complete Induction Motor drive is designed for pumping application with modulation strategy as Sinusoidal pulse width modulation (SPWM). The proposed concept is further implemented with seven level inverter replacing five level system and results are obtained using Matlab/Simulink software