Ride-through topology for adjustable speed drives (ASD's) during power system faults

摘要

ASD's are susceptible to voltage sags occurring due to faults in the power system. There are different techniques to perform ride-through of ASD's during voltage sag conditions. These are aimed at maintaining the DC-link voltage constant by injecting energy from an external source. Ultracapacitors, as storage device, are of reduced size as compared to batteries and provide fast energy exchange. In this paper, the improved performance of ASD's with Ultracapacitors during various power system faults is demonstrated using MATLAB simulation.