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A fourlevel openend winding induction motor drive (OEWIMD) is realised by feeding the open stator windings of a threephase induction motor from either end with twolevel voltage source inverters (VSIs). These VSIs are operated with unequal DClink voltages, which are in the ratio of 2:1. This circuit configuration has the disadvantage of overcharging the DClink capacitor of the inverter operated with the lower input voltage. Decoupled space vector pulsewidth modulation (DSVPWM) schemes, which were suggested in the previous literature to circumvent this problem, result in higher switching power loss in the dualinverter topology. It is known that the discontinuous pulsewidth modulation (PWM) schemes reduce the switching power loss. However, lack of structural symmetry of the power circuit renders it unwieldy to devise these PWM schemes. This study explores the applicability of discontinuous decoupled SVPWM (DDPWM) techniques for the fourlevel OEWIMD, without compromising on the waveform symmetries. With the aid of an improvised loss model, it is shown that these PWM schemes achieve the reduction of the overall loss of the fourlevel OEWIMD compared to the DSVPWM schemes. It has also been observed that one of the proposed DDPWM schemes result in reduced dv⁄dt in the motor phase voltages.
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