Battery Models in PSIM

PSIM has several different battery models for your simulations. But before you use a battery model you should think about what you are trying to model. For basic power converter operation it might be sufficient to model the max and min battery voltages with their corresponding series resistance. If you need something that will track charge and give a dynamic Voc for the battery you have two basic options: an equation based model or a lookup table based model.

The lookup tables track open circuit voltage, Voc,  vs remaining charge. The Li-Ion Battery models uses an equation and curve fit based on key points of the discharge curve vs SOC.

Lookup Table Battery Model

The top three look up tables provide a changing series resistance based on SOC and if you are charging or discharging. Below is a from the PSIM help for these elements. There is much more information available in PSIM, this is just a basic overview.

Equation Battery Model

The equation based model follows these main points and does not have a changing internal resistance with SOC or with charge or discharge operation.

The lookup table models can be used to model any sort of chemistry, Li-Ion, lead acid, NiMH, etc. The equation based model is geared towards Li-Ion, but can be model other chemistries if you adjust how you define the inflection points of the curve.

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