how to solve when appear the error: "Nonlinear solver: failed to converge, residual norm too large."

I,m getting this error whenever I'm trying to simulate of BEV Model in SImulnk. how to solve when appear the error: "Nonlinear solver: failed to converge, residual norm too large."

Answer 1

[Karanjot]

Hi Basant,

I understand that want to debug the following error in your Simulink model:

Nonlinear solver: failed to converge, residual norm too large.

Please provide the complete model & files associated with this error. This error is often encountered when a model is too ideal and exhibits sudden transitions, hence, the solver fails to converge. In such cases, the solver performs transient initialization.

I recommend the following changes to help resolve the error:

1. Reduce the maximum time step to see if a smaller time step helps the simulation converge.
2. Increase the consistency tolerance in the solver configuration block.
3. Consider adjusting component parameters such as ‘Open resistance’ or ‘Closed Conductance’ that make the model more realistic and less ideal.
4. Refine the model Review the model for errors, inconsistencies, or incorrect assumptions. Simplify the model by removing unnecessary components or subsystems.

To learn more about troubleshooting simulation errors & transient initialization, please refer to the below documentation:

https://www.mathworks.com/help/simscape/ug/troubleshooting-simulation-errors.html

https://www.mathworks.com/help/simscape/ug/how-simscape-simulation-works.html?searchHighlight=bql2kkl-2.html&s_tid=srchtitle_bql2kkl-2.html_1#bqoxlpd-1

I hope this helps!