  A comparative analysis of vector control scheme based on different current
control switching pulses (HC, SPWM, DPWM and SVPWM) for the speed response of
motor drive is analysed in this paper. The control system using different
switching techniques, are comparatively simulated and analysed. Ac motor drives
are progressively used in high-performance application industries due to small
size, efficient performance, robust to torque response and high power to size
ratio. A mathematical model of ac motor drives is presented in order to explain
the numerical theory of motor drives. The vector control technique is utilized
for efficient speed control of ac motor drive based on independent torque and
air gap flux control. The study compares the total harmonic distortion contents
of phase currents of ac motor drive and speed response in each case. The
simulation result shows that total harmonic distortion across the phase current
in SVPWM is less as compared to other switching techniques while the rise time
in speed response across SVPWM technique is faster as compared to other
switching methods. The simulation result of ac motor drives speed control is
demonstrated in Matlab/Simulink 2018b.
