Comparative Evaluation of SVPWM Strategies for a Dual Inverter fed Open-End Winding Induction Motor Drive with a Single DC Power Supply

The dual-inverter fed Open-End Winding Induction Motor drive offers interesting possibilities for multilevel inversion. It needs two isolated power supplies to feed individual inverters to avoid the flow of zero-sequence current. Three Space Vector PWM schemes have been reported in the earlier literature, which facilitate the operation of the dual-inverter drive with a single power supply. This paper critically compares the performance of these three Space Vector PWM techniques for a dual-inverter fed Open-End Winding Induction Motor drive, which requires only one DC power supply. The criteria of comparison are: (i) the Total Harmonic Distortion (THD) in the voltage waveform (ii) the Total Harmonic Distortion (THD) in the phase current waveform (iii) RMS value of the stator flux ripple and (iv) switching and conduction losses of the switching devices. The relative merits and demerits of each SVPWM technique in these four aspects are presented. The performance of dual-inverter fed OEWIM drive with two isolated DC power supplies in these four aspects is used as a benchmark for comparison.