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Energies 2018, 11(3), 542; https://doi.org/10.3390/en11030542

Line-Interactive Transformerless Uninterruptible Power Supply (UPS) with a Fuel Cell as the Primary Source

1
Department of Electrical Engineering, University of Engineering and Technology, 25000 Peshawar, Pakistan
2
Department of Electrical Engineering, Bahria University, 44000 Islamabad, Pakistan
3
Department of Electrical Engineering, Iqra University, 44000 Islamabad, Pakistan
*
Author to whom correspondence should be addressed.
Received: 8 December 2017 / Revised: 6 February 2018 / Accepted: 7 February 2018 / Published: 2 March 2018
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Abstract

This paper presents line-interactive transformerless Uninterruptible Power Supply (UPS) with a fuel cell as the prime energy source. The proposed UPS consists of three major parts (i.e., an output inverter, a unidirectional DC–DC converter, and a battery charger/discharger). Non-isolated topologies of both the unidirectional converter and battery charger/discharger ensure transformerless operation of the UPS system. A new topology of high gain converter is employed for boosting the low voltage of the fuel cell to a higher DC link voltage, with minimum semiconductor count, and high efficiency. A high-gain battery charger/discharger realizes the bidirectional operation between the DC link and the battery bank. Besides, it regulates the DC link voltage during the cold start of fuel cells and keeps the battery bank voltage to only 24 V. A new inverter control scheme is introduced that regulates the output voltage and minimizes the total harmonic distortion for non-linear loading condition. The proposed control scheme integrates proportional-resonant control with slide mode control, which improves the controller’s performance in transient conditions. The proposed UPS system is validated by developing a 1-kVA experimental prototype. View Full-Text
Keywords: fuel cell; line-interactive; uninterruptible power supply; transformerless; DC–DC converter fuel cell; line-interactive; uninterruptible power supply; transformerless; DC–DC converter
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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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Iftikhar, M.; Aamir, M.; Waqar, A.; Naila; Muslim, F.B.; Alam, I. Line-Interactive Transformerless Uninterruptible Power Supply (UPS) with a Fuel Cell as the Primary Source. Energies 2018, 11, 542.

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