- Reduce the maximum time step to see if a smaller time step helps the simulation converge.
- Increase the consistency tolerance in the solver configuration block.
- Consider adjusting component parameters such as ‘Open resistance’ or ‘Closed Conductance’ that make the model more realistic and less ideal.
- Refine the model Review the model for errors, inconsistencies, or incorrect assumptions. Simplify the model by removing unnecessary components or subsystems.
Nonlinear solver: failed to converge, residual norm too large.... Here is the set of components with unconverged equations
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Hi!
I've disinged a simscape componet which represents an electrical componet that reproduce the folloving beahviour
, where v is the voltage i the current and k a constant with units
. I develop the following .ssc document
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/209682/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/209683/image.png)
component ducComp
nodes
p = foundation.electrical.electrical; % +:left
n = foundation.electrical.electrical; % -:right
end
variables
i = { 0, 'A' }; % Current
v = { 0, 'V' }; % Voltage
end
parameters
K = { 1, 'V/(A^2)' }; % k value
end
branches
i : p.i -> n.i;
end
equations
assert(K>=0);
v == ((i^2)*K);
v == p.v - n.v;
end
end
So, the problem is that when I increase the value of my K, the simulation give the following error:
- Nonlinear solver: failed to converge, residual norm too large.
- Here is the set of components with unconverged equations
I tried to reduce my time step and to increase the Consistency tolerance but the problem persists... I do not know what could be the problem, so if anyone can help me I will be very grateful.
Thanks for you time
Pd: Using matlab 2018b
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Antworten (1)
Karanjot
am 29 Sep. 2023
Hi Pablo,
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:
To learn more about troubleshooting simulation errors & transient initialization, please refer to the below documentation:
I hope this helps!
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