Performance Improvement of AC Adjustable Speed Drives During Voltage Sag Events


This paper analyses voltage sag effects on adjustable speed drives (ASDs) performance reduction with vector controlled induction motors (IMs). The ability of ASDs to maintain desired speed and/or torque responses during voltage reduction is of partial importance for some industrial ASDs. Improvement of motor control software is superior solution in relation to hardware modifications, primarily from the aspect of price, and also in terms of simple upgrade of existing electrical drives. Flux weakening with appropriate drive selection is efficient solution to overcome the most common voltage sag events. In this paper, theoretical explanation is supported with experimental tests of industrial and laboratory drives.

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