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    Reliability considerations of a fuel cell backup power system for telecom applications
    (Elsevier Science Bv, 2016) Serincan, Mustafa Fazil
    A commercial fuel cell backup power unit is tested in real life operating conditions at a base station of a Turkish telecom operator. The fuel cell system responds to 256 of 260 electric,power outages successfully, providing the required power to the base station. Reliability of the fuel cell backup power unit is found to be 98.5% at the system level. On the other hand, a qualitative reliability analysis at the component level is carried out. Implications of the power management algorithm on reliability is discussed. Moreover, integration of the backup power unit to the base station ecosystem is reviewed in the context of reliability. Impact of inverter design on the stability of the output power is outlined. Significant current harmonics are encountered when a generic inverter is used. However, ripples are attenuated significantly when a custom design inverter is used. Further, fault conditions are considered for real world case studies such as running out of hydrogen, a malfunction in the system, or an unprecedented operating scheme. Some design guidelines are suggested for hybridization of the backup power unit for an uninterrupted operation. (C) 2016 Elsevier B.V. All rights reserved.
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    Validation of hybridization methodologies of fuel cell backup power systems in real-world telecom applications
    (Pergamon-Elsevier Science Ltd, 2016) Serincan, Mustafa Fazil
    Two commercial fuel cell backup power units have been tested under real life operating conditions at two base stations of a leading telecom operator in Turkey. Each unit has a distinct system architecture and employs different power management methodology. Systems have been tested for a total of 646 on/off cycles providing more than 300 h of backup power during electricity grid shutdowns. In 98% of the tests, systems have delivered the power demanded by the equipment in the base station successfully. For the remaining times, failures are frequently recorded with the auxiliary components in the hydrogen generation equipment. Excluding these peripheral issues, reliability of the fuel cell technology is found to be more than 99%. It is recognized that power management methodology has a significant impact on the system response during system operation. power management algorithms determine how the base station load demand is shared between the fuel cell and the batteries. However, no significant benefit has been recorded for either of the hybridization methodology over the other. Both topologies have been shown to be very reliable over the test period. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.