MATHEMATICAL MODEL FOR SLI BATTERIES IN STAND-ALONE PHOTOVOLTAIC SYSTEMS
DOI:
https://doi.org/10.59627/cbens.2008.1532Keywords:
Systems Autonomous Photovoltaic, SLI Batteries, Mathematical ModelAbstract
Many Latin-American countries with a significant amount of the population living in rural zones, without access the electric power and basic social service, find in the photovoltaic technology a way for human and productive development. The stand-alone photovoltaic systems (SAPS) use, in general, motor vehicle starting, lighting and ignition (SLI) batteries as a way of storage energy. These batteries make an electric match with the photovoltaic generator through their voltage, setting its working point. Predict the behavior of the accumulation system has great importance because its performance affects the reliability of SAPS. With the objective to study and to predict the behavior of batteries in SAPS, the Solar Energy Laboratory at UFRGS developed a batteries test system, where real conditions of operation can be reproduced under controlled conditions. This work presents experimental analysis that allowed, with theory studies, to obtain algorithms to determine the voltage of lead-acid batteries in different operation conditions. The algorithms, implemented in mathematical models, were incorporated into a software that simulates the behavior of SAPS. Results obtained through the application of these algorithms were compared with values acquired in a battery test system, and showed maximum deviation about 6%, that was considered appropriate for an hourly time basis simulation.
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