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How does the maximum and minimum step size affect the simulation of a model?

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chethan
chethan on 10 May 2013
Commented: Taimur Zaman on 18 Mar 2018
what should be the nominal value for the simulation? and is there any range for particular type of simulation?

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Jordan Monthei
Jordan Monthei on 10 May 2013
Edited: Jordan Monthei on 10 May 2013
These values are completely dependent on the simulation that you are running. I will explain what step size is in a quick example. Say you have a range from 0-100 seconds and you would like to sample values across this range of time. If you consider your step size in regards to your sampling time:
  • A step size of 10 would take a value every 10 seconds and give you 10 data points to use.
  • A step size of 1 would take a value every 1 second and give you 100 data points to use.
A high step size will run quickly but take few data points and conversely a low step size will take many data points but take longer to run as a result.
So as i said before, it depends upon the application.
  • If you would like to note precise changes, then it is recommended to use a smaller step size.
  • If you are not concerned with precise changes and would like to run faster, then use a larger step size.

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Kaustubha Govind
Kaustubha Govind on 10 May 2013
Jordan: If the OP is indeed using a variable-step solver as I suspect, and is asking about the Configuration Parameters for Max/Min step size, I don't think your answer will apply.
Taimur Zaman
Taimur Zaman on 18 Mar 2018
I am actually trying to simulate a high frequency bridge with Linear Transformer, and this problems actually happens.

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Kaustubha Govind
Kaustubha Govind on 10 May 2013
It appears that you are using a Variable-step solver, please read Choosing a Variable-Step Solver to understand how the Variable-step Solver changes the step-size to maintain accuracy of the simulation. The min/max step-sizes are the smallest/largest step-sizes the solver can take during the simulation. The documentation for the Max step size and Min step size parameters explains what values the solver picks when the 'auto' settings are used.

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