Abstract
The paper attempts to develop a new pulse width modulation (PWM) strategy suitable for the cascaded H-Bridge multilevel inverter (CHBMLI) with a view to improve the performance of the Induction motor connected to it. The philosophy endeavors to arbitrate on the appropriate use of the reference sine wave in the generation of switching pulses for the power switches in the MLI. It dwells on the choice of the portions that essay an effective change of the modulation index to bring about a variation in the output voltage. The inherent poignant features of the phase disposition (PD) modulation technique intertwine with the reformulated philosophy to trace a nearly sinusoidal output voltage. The etiquette framework orchestrates to dispense with the higher frequency components and furnish an improved output voltage spectrum. The relatively lower total harmonic distortion (THD) indices for both output phase and line voltages allow the 60 degree PWM to claim an enhanced performance for the CHBMLI and in turn the induction motor. The delicacies of the field programmable gate array (FPGA) augur to realize the pulses and the experimental results from a suitable prototype adequately validate the simulated performance. The emphasis entices for opening up the portals of the traditional topology to a new dimension and ensures its use in practical applications.
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