A Modified Direct Torque Control of a Five-Phase Induction Motor for Harmonic Current Elimination and Reduction of Common Mode Voltage

The classical hysteresis-based direct torque control (DTC) in five-phase electrical drives is a simple and effective control scheme that exhibits superior dynamics and less parameter dependency. It is necessary to eliminate harmonic (xy) plane components while implementing any control scheme of five-phase induction motors. In literature, most of the proposed lookup table-based DTC techniques of five-phase induction motor focus on the reduction of torque ripple and flux ripple and elimination/reduction harmonic plane currents and not focus on common mode voltage (CMV) reduction. The proposed lookup table-based DTC uses only small and large voltage vectors of the 2-level 5-leg inverter, which provides the lowest CMV along with torque and flux ripple reduction. A modified lookup table-based DTC is implemented to control the five-phase induction motor which eliminates harmonic plane currents and minimizes the CMV along with the torque and flux ripple reduction. The effectiveness of the proposed DTC technique is verified by simulating the model in the MATLAB/Simulink software.