Run Current Profiles on a cell and only receive simulated results

I have parameterized a cell based on lab data and would now like to simulate a voltage response based on a current profile. I think I was able to do it once as shown in the picture but I'm having trouble figuring out the settings. Basically I want the current profile (already known) with the simulated voltage based on parameters that were optimized from previous data. I am also interested in known how to export the voltage_sim into an array/csv file in addition to the graph.

I do keep seeing the pop up there is no experiment data for 'voltage_sim,' edit the experiment to specify data for 'voltage_sim.'

[Katarina Rodak]

Did figure out how to isolate only the simulated data, but I'm struggling on how to export the data from my scope - i want a matrix with time, voltage, current, and SOC.

[Katarina Rodak]

Running into another issue/question - I changed the current demand (basically increasing by x3) and it didn't change the voltage response. The mean of the voltage response is just the nominal voltage. I can't tell if my model just isn't updating or if something else is going on.

[Javier Gazzarri]

Hi Katerina,

To export a signal to the workspace, please click on it, hover over it and click on the "wifi" icon. This will log the signal under the name you've given and create a workspace variable at the end of the simulation. The Simulink Configuration Parameters has a Input/Output section where you can specify the variable data type, un your case an array.

To your second question - If you are running this from the Simulink Design Optimization UI, please bear in mind that it has its own workspace which is different from the base workspace, so changes done on the latter will not affect the former unless you explicitely navigate to the signal in the SDO UI and edit it.

Please send me your model (if you are allowed to do so) if this does not resolve your problem, and I'll take a look on my side.

Best regards,

Javier

Answer 1

[Javier Gazzarri]

Hello Katarina,

The task you are describing is the validation of the estimated parameters. You need to specify the validation current profile as such in the Parameter Estimation app. Please see the model here where I created an example including both estimation and validation. syntheticData

Please follow these steps:

1) open slx model and run it to see a simulation prior to parameter estimation

2) open Parameter Estimation from the shortcut in the bottom center of the canvas and run the estimation

3) Go to Select Experiments and see how I assigned the validation experiment

4) Run Validation from the VALIDATION tab

Please let me know how it goes.

Best regards,

Javier

[Katarina Rodak]

Hi Javier,

I was able to get this working but I have another question: my validation run should go to the same end time as my experimental data? I'm expecting the final point to be around 1400 seconds but my simulation with tuned parameters only goes to about 400 seconds. Thank you for all that you do - I've watched lots of your youtube videos!

[Javier Gazzarri]

Hello Katarina,

It is not necessary for the validation test to be of any specific length. Its purpose is to evaluate how robustly your parameters are able to predict a response to a stimulus the model never saw before. Ideally it should exercise the model throughout a wide range of states so as to make sure it works well under any condition within the intended use.

Hope this helps and glad you enjoyed our videos. Thank you for your kind words.

Javier

[Katarina Rodak]

Hi Javier,

I think I understand. Is there a way to force it to run for the whole time step? Basically, I have several current profiles that I would like to run on my cell (already parameterized from lab data) but I don't have a voltage to validate against; I'm just interested in the voltage response.

Katarina

Answer 2

[Javier Gazzarri]

Hi Katarina,

Certainly. If you need to run one or several current profiles through your model, please connect a controlled current source to the battery block and feed it with an "In" block. You will have to connect a S-PS converter downstream of it.

Then go to MODELING->Model Settings->Data Import/Export, and select Input by checking on the box next to it. In the field on the right, write the Nx2 input array as [time, current].

Simulink will run the sim using this current and for the time specified by "time".

Best regards,

Javier