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In the State of Charge (SOC) estimation, why does it usually uses Extended Kalman Filter (EKF) rather than the standard Kalman Filter (KF)? I've read several journals reasons-out that the OCV-SOC relationship is nonlinear. If so, where is the application of linearization in the state space equations?

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  • \$\begingroup\$ I think this question requires some elaboration. Can you provide some kind of link or citation to the journal articles you are referring to? \$\endgroup\$ – mkeith Jun 29 '18 at 3:36
  • \$\begingroup\$ Yeah there is no "the SOC estimation" - everyone does it differently, so this needs more surrounding material to get a useful answer. \$\endgroup\$ – Arsenal Jun 29 '18 at 5:40
  • \$\begingroup\$ Indeed, the Kalman Filter only applies for Linear Systems, and the Extended Kalman Filter is a good choice for Non-Linear Systems. Do you have some model for your OCV-SOC system? \$\endgroup\$ – Brethlosze Jun 29 '18 at 20:16
  • \$\begingroup\$ @mkeith . I've been using this reference as the basis of our study, but I am stuck on the use of EKF, since I cannot recognize where the linearization has been implemented in the algorithm link \$\endgroup\$ – Paul Jun 30 '18 at 7:05

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