Input voltage unbalance and sag conditions because of the power system line faults may lead to maloperation of adjustable-speed drive (ASD's). In this paper, the effect of balanced and unbalanced sags on the performance of ASD's has been discussed. The improved performance of ASD's with ultracapacitors is demonstrated using MATLAB simulation.Index Terms--Adjustable-speed drives (ASD's), power quality, ultracapacitors, voltage sag, voltage unbalance.
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