Cant not change the environment temperature in PEM fuel cell model

Hi,

I use the PEM fuel cell model : https://fr.mathworks.com/help/simscape/ug/pem-fuel-cell-system.html

The initial value of the environment temperature is 20°C --> "env_T=20".

I want to change it to 18°C, so "env_T=18" :

I didn't change the other parameters, just the "env_T".

When I run the simulation, there is a lot of error messages :

• "First solve for initial conditiond failed to converge. Trying again with all high priorities relaxed to low."
• "Second solve for initial conditioned failed to converge.Trying again with all variable targets ignored."
• "Here is the set of components with unconverged equations :" -----> especially for pipe equations...

How can I solve this problem ?

Thanks in advance

Best regards

Naouel

Answer 1

[Nirupama]

Hi @Naouel,

I ran the example mentioned in the following documentation page on MATLAB R2023b: https://www.mathworks.com/help/simscape/ug/pem-fuel-cell-system.html

The simulation results were as expected.

I then modified the "env_T" from 20 to 18. The detailed steps are as follows:

1. Open the example in MATLAB R2023b using

openExample('simscape/PEMFuelCellSystemExample')

2. Navigate to "Modelling" tab and click "Model Explorer"

3. Under "PEMFuelCellSystem" click "Model Workspace"

4. Change the value of "env_T" to 18. Hit "Enter" or Click "Apply".

5. Run the model

The simulation went through without any errors. I did not come across the errors that you have mentioned. May be there were some subtle changes that you made unknowingly.

I would recommend you to open a fresh copy of the example in MATLAB R2023b and try out the steps mentioned above.

Hope this helps!