An investigation of the ripple reduction capacity of compensated direct torque control with duty ratio optimization for permanent magnet synchronous motor drive

Abstract

The performance of control algorithms is evaluated in both dynamic and steady-state conditions. Direct torque control (DTC) is the ideal option for situations that demand quick dynamics. Despite having the best dynamic response, conventional direct torque control (CDTC) has poor ripple and harmonic performance. The compensated direct torque control with duty ratio optimization (DTC-DRO) is proposed in this work to solve the shortcomings of CDTC. The other four control algorithms were applied to the identical case and their performance was compared to that of DTC-DRO to compare and contrast the ripple and harmonic reduction capabilities of DTC-DRO. For comparison purposes, current control (CC), CDTC, proportional-integral flux manipulated direct torque control (PIFM-DTC), and space vector pulse width modulation (SVPWM) were used. The comparison was made by taking key factors like the torque ripple performance, speed response performance, flux magnitude variation, stator current total harmonic distortion, and voltage total harmonic distortion. To simulate and compare the performance of each control strategy, the Matlab Simulink 2021b environment was utilized. The result of the simulation indicates that all DTC category methods have fast dynamic performance. But the performance of DTC-DRO is better than SVPWM in terms of dynamic and steady-state performance for the considered case. The voltage harmonic distortion, current harmonic distortion, and torque ripple performance of a DTC-DRO are better than those of all control techniques studied in this work. In general, DTC-DRO is suitable for a drive application where fast dynamics and less ripple are required.