IEICE Electronics Express
Online ISSN : 1349-2543
A three-phase off-line UPS system for transformer coupled loads
Syed Sabir Hussain BukhariMuhammad AyubShahid AtiqByung-il Kwon
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2017 Volume 14 Issue 20 Pages 20170815


A number of critical load applications depend on a UPS system to uphold the normal operation. As soon as any disruption happens on the utility, an off-line UPS system starts supplying the power to the load to prevent blackout. Nonetheless, during this process, a substantial inrush current can be observed for the transformer-coupled loads. To avoid this inrush current, we propose an off-line UPS system based on a current regulated voltage source inverter. The inverter of the proposed UPS system uses a current control scheme executed in a stationary frame to regulate the load current and eliminates the likelihood of the inrush current. To endorse the performance of the proposed UPS system, we constructed a small prototype to obtain the experimental results.

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© 2017 by The Institute of Electronics, Information and Communication Engineers
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