Review:Uninterruptible Power Supply(UPS)system Muhammad Aamir,Kafeel Ahmed Kalwar,Saad Mekhilef Power Electronics and Renewable Energy Research Laboratory(PEARL),
Department of Electrical Engineering,University of Malaya,Kuala Lumpur
Malaysia
ABSTRACT
Uninterruptible Power Supplies (UPS) have reached a mature level by providing clean and uninterruptible power to the sensitive loads in all grid conditions. Generally UPS system provides regulated
sinusoidal output voltage, with low total harmonics distortion (THD), and high input power factor
irrespective of the changes in the grid voltage. This paper provides comprehensive review of UPS
topologies, circuit configurations, and different control techniques used in the UPS system. A comparison
based on the performance, size, cost, and efficiency of the system is presented. Different hybrid energy
source UPS system and new generation UPS system for smart grid and micro-grid has been explained.
Finally the paper describes performance evaluation of UPS system and explains different aspects that are
to be considered for choosing a suitable UPS system by the user.
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