A dtc algorithm for induction motor drives with 3-level diode-clamped inverters

Abstract EN

This paper presents a novel Direct Torque Control (DTC) algorithm for induction motor electrical drives supplied by 8-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.