Why are the results different between Simscape model and Simulink generated model ?

Question

Samuel Quiniou 2020-4-14

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评论： Joel Van Sickel 2020-8-6

Hello,

I am generating a Simulink implementation model from a Simscape model through the sschdladvisor tool. Without any modification on the generated Simulink implementation model, the results on the waves are different. The output voltage starts at 300V in the Simscape model, and starts at 0V in the generated Simulink implementation model. Could you please help me to understand why the results are different ?

My only idea is that the capacitor has an initial voltage in "Variable" > "Capacitor voltage". Is this parameter not compatible with sschdladvisor ?

Simscape model

Results

Left : Simscape model

Right : Generated Simulink implementation model by sschdladvisor

Thank you for your help

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Samuel Quiniou 2020-4-27

Hello,

Any suggestion about my problem ?

Thank you for your help

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Answer 1

Joel Van Sickel 2020-8-5

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Hello Samuel,

the first thing to check is to make sure the step size is the same between the two models. I am assuming it is, but it is good to check just in case. If the step size is the same, it is possible that the number of iterations is not correct, although for your model, it looks like the number of iterations should be 1, in which case their should be no issues.

initial conditions should work with this workflow, although if you change the initial conditions in the original model, you'd need to rerun the workflow advisor to update the model.

Would you be willing to share your model? (we can do that seperately through a secure means instead of you posting it here)

Regards,

Joel

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Samuel Quiniou 2020-8-6

Hello Joel and thank you for your answer. Where could I find the step size in the two models ?

Joel Van Sickel 2020-8-6

Hello Samuel,

you can find it in the solver configuration block you have attatched to your simscape model, as well as in your simulink solver settings.

You could also try simulating both with zero initial conditions. If they line up then and not with initial conditions, then you would know for sure if that was the issue.

Regards,

Joel

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