Print Email Facebook Twitter Constructing accurate equivalent electrical circuit models of lithium iron phosphate and lead-acid battery cells for solar home system applications Title Constructing accurate equivalent electrical circuit models of lithium iron phosphate and lead-acid battery cells for solar home system applications Author Yu, Y. (TU Delft Electrical Engineering, Mathematics and Computer Science) Narayan, N.S. (TU Delft DC systems, Energy conversion & Storage) Vega Garita, V.E. (TU Delft DC systems, Energy conversion & Storage) Popovic, J. (TU Delft DC systems, Energy conversion & Storage) Qin, Z. (TU Delft DC systems, Energy conversion & Storage) Wagemaker, M. (TU Delft RST/Storage of Electrochemical Energy) Bauer, P. (TU Delft DC systems, Energy conversion & Storage) Zeman, M. (TU Delft Electrical Sustainable Energy) Faculty Electrical Engineering, Mathematics and Computer Science Department Electrical Sustainable Energy Date 2018 Abstract The past few years have seen strong growth of solar-based off-grid energy solutions such as Solar Home Systems (SHS) as a means to ameliorate the grave problem of energy poverty. Battery storage is an essential component of SHS. An accurate battery model can play a vital role in SHS design. Knowing the dynamic behaviour of the battery is important for the battery sizing and estimating the battery behaviour for the chosen application at the system design stage. In this paper, an accurate cell level dynamic battery model based on the electrical equivalent circuit is constructed for two battery technologies: the valve regulated lead-acid (VRLA) battery and the LiFePO4 (LFP) battery. Series of experiments were performed to obtain the relevant model parameters. This model is built for low C-rate applications (lower than 0.5 C-rate) as expected in SHS. The model considers the non-linear relation between the state of charge (SOC) and open circuit voltage (VOC) for both technologies. Additionally, the equivalent electrical circuit model for the VRLA battery was improved by including a 2nd order RC pair. The simulated model differs from the experimentally obtained result by less than 2%. This cell level battery model can be potentially scaled to battery pack level with flexible capacity, making the dynamic battery model a useful tool in SHS design. Subject Battery testingDynamic battery modelElectric equivalent circuit battery modelLiFePO4Solar home systemsVRLA To reference this document use: http://resolver.tudelft.nl/uuid:f8322ca2-fb42-4f37-8e83-4d8b7c53304f DOI https://doi.org/10.3390/en11092305 ISSN 1996-1073 Source Energies, 11 (9), 1-20 Part of collection Institutional Repository Document type journal article Rights © 2018 Y. Yu, N.S. Narayan, V.E. Vega Garita, J. Popovic, Z. Qin, M. Wagemaker, P. Bauer, M. Zeman Files PDF energies_11_02305_v2.pdf 1.68 MB Close viewer /islandora/object/uuid:f8322ca2-fb42-4f37-8e83-4d8b7c53304f/datastream/OBJ/view