A HYBRID POLYGONAL SV STRUCTURE FOR THE V/F CONTROL OF AN INDUCTION MOTOR WITH OPEN END WINDING

Multilevel Inverters are preferred over conventional two level inverters in order to reduce inverter switching losses and to achieve output quality. The present study involves the harmonics analysis of an open end winding Induction Motor drive, using level PWM technique. The proposed multilevel inverter arrangement produces hexagonal voltage space vector structure in lower modulation region and a 12-sided polygonal space vector structure in the higher modulation region. The stator winding of the motor is fed from both ends with an asymmetric DC link voltage having ratio 1:0.366. This method eliminates 5 th &7 th order harmonics from the phase voltage and current. Other advantage is higher linear modulation range.FFT analysis is proposed on the scheme to verify the reduction in harmonics in the output wave form.

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