Selection of the battery Sample Clauses

Selection of the battery model for the purposes of the project All three models presented so far, can effectively represent state-of-charge and terminal voltage variations for the batteries to be included in the PED. Simple model can be included in a simulation environment in a straightforward manner, and this also applies to the Zero-hysteresis model and the Combined one. So, in terms of computational effort, all three alternatives are perfectly eligible. The main difference is in terms of parameter identification. The Simple model just accounts on 2 parameters, while there are 3 parameters to identify adopting the Zero-hysteresis option, and 7 for the Combined model. The parameters identification procedure relays on the application of the least-squares estimation theory [5]. The idea is to compare the response variable of a real system (let’s say, the terminal voltage of a battery), with the estimated response by a model . The quadratic error between these two magnitudes is to be minimized applying this theory. The optimal solution, i.e. the one with minimum error, is the one provided by a particular set of parameters of the model. This set contains the value for the parameters of the model being adjusted. A detailed description of the least-squares estimation is offered in the Annex 2. For the application of the least-squares estimation technique, the batteries should be tested and the terminal voltage and the current profiles should be saved. Then, these are utilized in the parameters estimation procedure. In such test, periods in which the battery is relaxed and others when the battery is driving current should be considered. Thus, results would provide information for characterizing the open circuit voltage for different state of charge, and also for characterizing the internal resistance, and hysteresis-related phenomena as well. What is usually applied to this end, is a train of charge and discharge current pulses for the battery, distributed in time between periods for the battery to relax. The test data are obtained from a public database [6] and corresponds to a lithium-ion cell (INR 00000-00X model). This is a cylindrical, 18650 standard type, similar to the ones actually building the lithium-ion battery pack to be integrated into the PED. Since considering such exemplary test as the common basis for adjusting the parameters of battery models, their performance can be fairly assessed. The input data are plotted in Figure 9. Orange and blue lines clearly plot the charge...
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