I am trying to use Matlab simscape library for lithium ion battery. I am trying to estimate the state of charge of the battery with help of extended kalman filter.
I am not able to estimate correct values, also I am not sure of the electrical equations. Can anyone help me?
For the electrical model I am referring to this one of the document.
Check the publications of Georg Walder and Campestrini. TU Muenchen
The catch with an EKF is that it only has local stability. This stability is around the trajectory or equilibrium at which the linearization is performed. This is the reason why many uses of the EKF converge in the conditions they are tuned to, but not elsewhere.
To understand the models, you may want to see the work of Scott Moura (http://ecal.berkeley.edu/publications.html) and references therein. You may be better off in using batch estimation methods as opposed to recursive estimation methods. It is only in convex problems that recursive methods generally converge to the batch solution.
Dear Kartik,
Thank you for the insights, and i agree with the problem pointed at EKF. I have a small question here, batch processing methods other than for estimation could we use them for data analysis. for e.g. In place of having hundreds of measured data I would require only 3 data points as reference and from there find rest of the values . Is that possible to achieve ? if so could you suggest me any examples.
Best Regards
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