Experimental analysis of various space vector pulse width modulation (SVPWM) techniques for dual three-phase induction motor drive

In recent years, multiphase induction machines are being utilized in various types of applications. These machines offer several advantages in motoring as well as generating mode of operation. In induction motor drives, space vector pulse width modulation (SVPWM) schemes can be utilized to improve the output voltage spectrum of an inverter, thus reducing stator harmonic currents and torque pulsation. When compared with conventional sinusoidal PWM technique, direct current (DC)-bus utilization is enhanced by using any SVPWM technique. In this paper, different existing SVPWM techniques are analyzed for a dual three-phase induction motor (DTIM) supplied from two three-phase voltage source converters connected in parallel. A modified SVPWM method is also proposed for dual three-phase induction motor drive. Harmonic components in the phase currents and phase voltages are analyzed for all the four different SVPWM schemes. A detailed modeling of DTIM along with SVPWM strategies are presented in the paper. Simulations are carried out on MATLAB/SIMULINK platform and performance of DTIM drive with all SVPWM techniques are observed on a laboratory prototype. Experimental results are provided to verify the analysis proposed.