Three Level Inverter to Improve Performance of Induction Motor Drives Using MATLAB

The conventional PWM inverters are able to generate mostly two level output waveforms. Many improvements have been proposed to classic configuration as regards the circuit structures, the control schemes, but the inverter performance was limited by the available number of levels to build the output voltage. To overcome these difficulties several topologies of multilevel inverter have been recently designed and they are now capturing the attention of many industries, specially for high power converters on account of certain advantages that these inverters have as compared to conventional PWM inverters like less switching losses, reduced harmonic losses, etc. In spite of these advantages some problem are also associated with these inverters. Out of these, capacitor voltage unbalance is prominent one. In this paper the SVM technique has been applied to formulate the switching pattern for three level inverter that minimizes the harmonic distortion at the inverter output.