Three Level Inverter based DTC of Induction Motors Utilizing RCPWM

Abstract

This paper introduces a streamlined space vector algorithm designed to regulate a three-level inverter-powered induction motor using direct torque control (DTC). Unlike the traditional two-level inverter, this drive utilizes a three-level inverter to achieve a reduction in torque ripple. The controller has been specifically designed to capitalize on the expanded range of inverter states that are made possible by utilizing a three-level inverter. The algorithm proposed in this study is flexible and can be applied to various rail clamping pulse width modulation (RCPWM) sequences. The RCPWM-3 demonstrates superior performance, which enhances the drive’s performance at near rated speeds. The findings indicate a reduction in harmonic distortion within the stator currents, alongside a consistent switching frequency of the inverter through the implementation of the suggested control system.