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Accuracy in Simulink in transient process calculation

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Hi,
I try calculate current in scheme (figure below).
There are some commutations:
1) t < 0, brA is off, brA1 is on;
2) t = t0, brA1 switch off;
3) t = t1, brA switch on.
Current in brA shown on figure below.
Where is problem? Why current amplitude isn't tend to steady state value?
Some additions:
EMTP doesn't have this problem and return right current curve.
All solvers give similar results.

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Accepted Answer

Joel Van Sickel
Joel Van Sickel on 16 Sep 2020
Hello Sergey,
for specialized power systesm, we recommend that you use solver ode23tb. You mention that you get the same results regardless of solver. This transient looks like ringing that could genuinely be there because of the inductances and capacitances in your model. You would need to provide a full schematic of the EMTP and simulink model to make a comparison before determining if anything is wrong. It is most likely that this circuit is not actually set up the same as the EMTP circuit and that both tools are simulating correctly for the data that was entered into them. Transferring a circuit from one simulator to another can often lead to unforseen differences because not all parameters are specified the same and similar blocks may behave differently than you expect. The most likely block to be causing problems would be the PI transmission line. After that, i would check the load block.
Regards,
Joel

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