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Energies 2017, 10(4), 418; doi:10.3390/en10040418

A High-Frequency Isolated Online Uninterruptible Power Supply (UPS) System with Small Battery Bank for Low Power Applications

1
Department of Electrical Engineering, Bahria University, Islamabad 44000, Pakistan
2
Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
3
Department of Electrical Engineering, DHA Suffa University, Karachi 75500, Pakistan
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 22 December 2016 / Revised: 16 March 2017 / Accepted: 17 March 2017 / Published: 23 March 2017
View Full-Text   |   Download PDF [5289 KB, uploaded 23 March 2017]   |  

Abstract

Uninterruptible power supplies (UPSs) are widely used to deliver reliable and high quality power to critical loads under all grid conditions. This paper proposes a high-frequency isolated online UPS system for low power applications. The proposed UPS consists of a single-stage AC-DC converter, boost DC-DC converter, and an inverter. The single-stage AC-DC converter provides galvanic isolation, input power factor correction, and continuous conduction of both input and output current. The low battery bank voltage is stepped up to high dc-link voltage by employing a high voltage gain boost converter, thus allows the reduction of battery bank to only 24 V parallel connected batteries. Operating batteries in parallel improves the battery performance and resolves the issues related to conventional battery banks that arrange the batteries in series combination. The inverter provides regulated output voltage to the load. A new cascaded slide mode (SM) and proportional-resonant (PR) control for the inverter has been proposed, which regulates the output voltage for both linear and non-linear loads. The controller shows excellent performance during load transients and step changes. Besides, the controller for boost converter and AC-DC converter is presented. Operating principle and experimental results of 1 kVA laboratory setup have been presented for the validation of proposed system. View Full-Text
Keywords: uninterruptible power supply (UPS); single-stage AC-DC converter; high-frequency isolation; boost converter; power factor correction uninterruptible power supply (UPS); single-stage AC-DC converter; high-frequency isolation; boost converter; power factor correction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Aamir, M.; Ullah Tareen, W.; Ahmed Kalwar, K.; Ahmed Memon, M.; Mekhilef, S. A High-Frequency Isolated Online Uninterruptible Power Supply (UPS) System with Small Battery Bank for Low Power Applications. Energies 2017, 10, 418.

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