NEW CURRENT CONTROL SCHEME FOR AC MOTOR DRIVES.
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abstract
A current control scheme based on programmed pulse-width-modulation switching patterns is presented for ac motor drives. In this scheme reference and feedback current correspondence is maintained with simultaneous optimization of a performance objective. The scheme overcomes the disadvantages of existing current regulators using the direct control approach, exhibiting reduced switching frequency, minimum current/torque ripple, higher efficiency, and improved performance in the ac motor drive. Analytical and experimental investigations of a current-regulated induction motor drive confirm the predicted advantages of the scheme.