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How to save and continue a switching event in dynamic simulation?

asked 2019-06-13 05:42:18 -0500

TonyWong gravatar image

Hi guys,

Newbie here. Got a question for you. I am wondering can I save a dynamic simulation progress in the middle of switching event, for instance, a fault on a bus, by saving the network case and snapshot, and later continue to run this simulation, say clear the fault in the continuation of the simulation?

I noticed that if I do so, after I reload the network case and snapshot, my fault is no longer in the list to be cleared. Does that mean dynamic simulation cannot be saved in the middle of switching event?

Thanks in advance!


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answered 2019-06-14 15:20:09 -0500

TonyWong gravatar image

updated 2019-06-14 15:24:42 -0500

Thanks perolofl!

Does that mean after reloading the case and snapshot, I have to reapply a fault at the interested bus? The result will be the same as if this fault hasn't been removed by PSSE, will it?

For instance, if I apply a fault at t=1 sec, and run to t=1.1 sec and trip off one line and saved the case and snapshot. Then, I reload these two files and reapply the fault at the exact same location, and continue my simulation. I suppose I will get the same result compared with continuously running the case, is that correct?


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The fault is already there in the form of a fixed bus shunt. As I said, just continue the simulation and remove the fault by removing the shunt at the bus.

perolofl gravatar imageperolofl ( 2019-06-14 17:11:21 -0500 )edit

So you mean, after reloading the case, even I cannot find the fault in the list, but there is a shunt at the faulted bus, I only have to remove this shunt whenever I want to clear the fault, is that right?

TonyWong gravatar imageTonyWong ( 2019-06-14 19:38:08 -0500 )edit

Yes, that is right.

perolofl gravatar imageperolofl ( 2019-06-15 02:02:09 -0500 )edit

thanks for that perolofl!

TonyWong gravatar imageTonyWong ( 2019-06-15 17:09:31 -0500 )edit

answered 2019-06-14 02:48:11 -0500

perolofl gravatar image

The information about the inserted fault is not preserved in the snapshot and it gets lost whenever you stop PSSE. After reloading the case and snapshot you can continue the simulation.

The fault is cleared in the "old-fashioned way", just remove the shunt inserted to represent the short circuit. For a bus fault, remove the fixed shunt B-value added at the faulted bus. This is how PSSE was run in the old days, before the present user interface!

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Asked: 2019-06-13 05:42:18 -0500

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Last updated: 2 days ago