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

Muhammad Iftikhar, Muhammad Aamir, Asad Waqar, Naila, Fahad Bin Muslim and Imtiaz Alam
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Muhammad Iftikhar: Department of Electrical Engineering, University of Engineering and Technology, 25000 Peshawar, Pakistan
Muhammad Aamir: Department of Electrical Engineering, Bahria University, 44000 Islamabad, Pakistan
Asad Waqar: Department of Electrical Engineering, Bahria University, 44000 Islamabad, Pakistan
Naila: Department of Electrical Engineering, Bahria University, 44000 Islamabad, Pakistan
Fahad Bin Muslim: Department of Electrical Engineering, Iqra University, 44000 Islamabad, Pakistan
Imtiaz Alam: Department of Electrical Engineering, Bahria University, 44000 Islamabad, Pakistan

Energies, 2018, vol. 11, issue 3, 1-19

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.

Keywords: fuel cell; line-interactive; uninterruptible power supply; transformerless; DC–DC converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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