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Open several psspy-instances from Python

asked 2015-02-19 05:50:15 -0500

Transmission Impossible gravatar image

updated 2015-02-24 04:49:24 -0500

Is it possible to have open several sav-files in Python, and do operations on them in parallel. For instance, I may want to run load flow analysis on two different load scenarios, or different topologies for the same power system and compare them. I would like to do something like:

psspy1.fnsl()
psspy2.fnsl()

And compare the branch flows etc. Is this possible? Any help is greatly appreciated!

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Thank you both jconto and sheng! I think I understand how it works now, and how I can solve the issues I'm having.

Transmission Impossible gravatar imageTransmission Impossible ( 2015-02-23 05:52:45 -0500 )edit

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answered 2015-02-22 10:40:41 -0500

jconto gravatar image

You cannot access the memory data in one PSSe GUI instance from a second PSSe GUI instance. Complementing Sheng's answer:

step1: run your LF activities (in parallel, distributed in several pcs or serially). Save the cases.

step2: run a python script to work on comparing (PSSe has an activity to compare two cases) the cases - you can process the cases within a loop to extract the information to be compared and write it to a csv file.

step3: The output csvfile can be loaded to excel for quick comparison of the variables of interest (or post-processed with a third python code)

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answered 2015-02-19 06:26:52 -0500

sheng gravatar image

I'm not sure what you have proposed will work.

Try using the Python Multiprocessing module--I have used it to run multiple instances of PSSE to perform tasks currently.

However if you are only solving couple of load flows, it is probably not worth the trouble.

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Thanks for the answer. I'm new to Python, so I don't really understand how the information is stored. I assume it's inside some object in the module psspy, but I'm not really sure. Is psspy a module that can only handle one object at a time? If the terminology I'm using is wrong, please correct it=)

Transmission Impossible gravatar imageTransmission Impossible ( 2015-02-20 03:37:59 -0500 )edit

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Asked: 2015-02-19 05:50:15 -0500

Seen: 1,053 times

Last updated: Feb 24 '15