70175 20190709135452.0 doi 10.1016/j.jpowsour.2017.04.090 sideral 98953 ART-2017-98953 eng Renau, Jordi Analysis of the performance of a passive hybrid powerplant to power a lightweight unmanned aerial vehicle for a high altitude mission 2017 Access copy available to the general public Unrestricted The objective of this research is to analyze the performance of a passive hybrid powerplant control system to be implemented in a lightweight unmanned aerial vehicle capable to ascend up to the high troposphere (10, 000 m). The powerplant is based on a high-temperature PEM fuel cell connected in parallel to a set of lithium-polymer batteries and regulated by two power diodes. Test performed in steady state demonstrates that the use of the hybrid system increases the efficiency of the stack by more than 7% because the voltage at the main DC bus is limited by the batteries. The robustness of the passive control system is proved in a long-term test in which random perturbations of ±15% are applied to the average power that would be demanded during the ascent flight. The hybridization of the stack with the batteries eliminates sudden peaks in the current generated by the stack, which are responsible for prompt degradation phenomena that drastically reduce its useful lifetime. The study demonstrates that with the passive hybrid powerplant it is possible to reach the target height with the gas storage system considered in the application, contrary to what happens with the simple power plant. info:eu-repo/grantAgreement/ES/DGA/T03 info:eu-repo/grantAgreement/ES/MINECO/DPI2015-69286-C3-1-R info:eu-repo/grantAgreement/ES/MINECO/ENE2012-38642-C02-01 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 6.945 2017 CHEMISTRY, PHYSICAL 26 / 146 = 0.178 2017 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 34 / 285 = 0.119 2017 Q1 T1 ENERGY & FUELS 9 / 97 = 0.093 2017 Q1 T1 ELECTROCHEMISTRY 3 / 28 = 0.107 2017 Q1 T1 2.202 2017 Electrical and Electronic Engineering 2017 Q1 Renewable Energy, Sustainability and the Environment 2017 Q1 Physical and Theoretical Chemistry 2017 Q1 Energy Engineering and Power Technology 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Sánchez, Fernando (orcid)0000-0003-4141-6072 Lozano, Antonio Universidad de Zaragoza (orcid)0000-0002-0063-1318 Barroso, Jorge Universidad de Zaragoza (orcid)0000-0002-5391-8021 Barreras, Félix Universidad de Zaragoza 5001 600 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Mecánica de Fluidos 356 (2017), 124-132 J. power sources JOURNAL OF POWER SOURCES 0378-7753 1230298 http://zaguan.unizar.es/record/70175/files/texto_completo.pdf Postprint 68827 http://zaguan.unizar.es/record/70175/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:70175 articulos driver 2019-07-09-11:41:23 ARTICLE