A 20-Sector Based High Resolution Direct Torque Control scheme for Five Phase Open End Winding Induction Motor Drives

Abstract

This paper proposes 20-sector based direct torque control (DTC) scheme for dual inverter fed five phase induction motor drives with open-end stator windings powered by a single DC source. The proposed scheme utilizes 20 virtual voltage vectors that divide the space vector plane into 20 sectors, each sector spanning 18 degrees. The 20-sector based DTC scheme provides a smoother control over torque and flux compared to the conventional 10 sector-based DTC schemes for five phase induction motors. The switching scheme used in the proposed scheme eliminates the auxiliary plane harmonic voltages and provides higher DC bus utilization compared to two-level five phase voltage source inverter fed DTC schemes. The switching scheme for realization of these virtual voltage vectors does not generate any resultant common mode voltage across the stator windings and hence a single DC source is used to supply both the voltage source inverters. The proposed DTC scheme is validated by extensive simulation using MATLAB-Simulink software and experimentally verified on a laboratory prototype.