8/18/2019 Mli for OEWIM

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DISCONTINUOUS PWM TECHNIQUES FOR OPEN-END

WINDING INDUCTION MOTOR DRIVE FOR ZERO

SEQUENCE VOLTAGE ELIMINATION

Abstract — In now a days modern multi level inverters have emerged to overcome the

drawbacks due to the conventional inverters. In various industries inverters with differentPWM techniques have been employed to .achieve good performance in the context of variable

speed drives. ut in the conventional inverter instantaneous sum of all the phase voltages is not

equal to !ero this results into !ero sequence voltages in inverters. "his !ero sequence voltages

will induce bearing currents inside the motor. If these currents exceed some permissible limits

premature failure of motor bearings will occur. "hese are some drawbacks due to the usage of 

conventional inverters in industries. In this paper the techniques to overcome the drawbacks

due to conventional inverter have been presented. "he cascaded connection of asynchronous

motor and two #$ level inverters at both ends of motor constitutes to open end winding

induction motor drive. "he characteristics of dual inverter fed open end winding induction

motor drive resembles to those of conventional three level inverter . In this paper the

performance characteristics of Induction motor with different PWM techniques like %PWM&

'%(PWM&)PWMMA*& )PWMMI+ have been analysed and the harmonic analysis has been

carried out using MA",A-%IM,I+/ environment.

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