A DTC Algorithm for Induction Motor Drives with 3-level Diode-Clamped Inverters

• Main Authors: M. Cirrincione, M. Pucci, G. Vitale
• Format: Article
• Language: English
• Published: ESRGroups 2005-12-01
• Series: Journal of Electrical Systems
• Subjects: Electrical drives; Multi-Level Converters; Induction Motors; DTC.
• Online Access: http://journal.esrgroups.org/jes/papers/1_4_2

This paper presents a novel Direct Torque Control (DTC) algorithm for induction motor electrical drives supplied by 3-level diode clamped inverters. It is the natural extension of the classic Switching Table (ST) based DTC, modified for a 3-level inverter supply. It presents also a very simple algorithm for the minimization of the capacitor voltage ripple. Results obtained with numerical simulations show that the employment of a 3-level inverter in such a control scheme permits to obtain the same dynamical performances as those obtained with a 2-level inverter with resulting lower torque and flux ripples as well as a lower harmonic content in the stator voltages and currents. Some considerations about the consequent benefits as for EMC of this drive are also presented.