Gusimurrvl's profile - activity

What I learned:

1. PSSE Version 33.4 contains a bug so that you can't import module wx or cmath without getting ImportError respectively making PSSE and Python crash. The bug is fixed in version 33.5 and 33.6 of PSSE so update your version of PSSE if you run into the problem. There is no quick-fix for the problem. Update your PSSE version instead!
2. You can't open PSSE GUI graphically after calling psseinint() from python.
3. You can't establish contact between an already running GUI PSSe instance and python code EXCEPT via "Run automation File".

The Easy fix they said would work didn't work so still interested if you got any other ideas that could help me. I'll be in contact with Siemens now to try to get Option 1. to work.

I might have just gotten lucky! I contacted Siemens PSSe support and they affirmed that it's a bug in PSSe version 33.4 that you cant import wx but that there is an easy fix for fixing the problem. I'll write under "Answer" if it works.

Everytime I want to try a new calculation based on an altered working case I got to save to a new *.SAV-file and then load that *.SAV from python. It wont make my program user friendly having to do those steps of saving and loading after every change i do in the PSSE GUI.

My last option/choice No.4 for my program is to run PSSe GUI seperate from my python program. The only way to get to the GUI PSSE working case data is to save it to a *.SAV-file, start python and psseinit() and load the *.SAV file.

Choice No.3 - I can't establish contact between an already running GUI PSSe instance and my python code except via "Run automation File".

Ok. Then I know that my choice No. 2 and No.3 for running my program isn't possible because (correct me if im wrong): Choice No.2 - I can't open PSSE GUI graphically after calling psseinint() from python.

Problem is that my PSSe V33.4 get ImportError when trying to "import wx" in PSSe. My program is all written with wx as base for the GUI. .... File "C:\Python27\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 4, in <module> import _core_ ImportError: DLL load failed: cant find module

Choice No. 1 for running my program is by opening PSSe GUI and loading my script with "Run automation file". I've been struggeling for 3 days trying to get that to work.

Ok. Check. I cant communicate between different instances of PSSE. Won't try to any more. Do you know if its possible to open the PSSE instance graphically that was initiated when calling psseinit() from python? I cant find the PSSE instance in the windows task bar list even though its running.

Thanks for your answer but after some thinking I realised I asked the wrong question. I've edited the question now. @jconto

Hello.

Ok. So I opened up a PSSE-process manually in windows. Is there a way to connect to this PSSE-process from my python program so that I can collect its data thats in the working case?

Calling psspy.psseinit() is not the answer because it initializes a new PSSE-process which is run in the background and that I can't see graphically.

I want to be able to access the data from the manually started graphical PSSE-process from Python. If there is no way of doing that, is there then a way of initializing a new PSSE-process (psseinit()) and then making this PSSE-process run open, graphically, in Windows? I don't want to have it running in the background.

The idea of my program is to let PSSE modify the network graphically with split bus, switch off line and other commandos and what the python part is to do it so tell PSSE when to make Fault calculations and then collect the fault data and present it graphically in my own python program instead of as text it the PSSE Output Bar.

Kind regards

Hello!

Does it exist an easier way of returning angles for fault currents and impedances after calling SCMU?

As of now I'm retrieving angles and impedances doing calculations on Short circuit currents and bus voltages retrieved by using the SCBUS and SCBRN2 commandos, i.e.: degree( phase( returned current of SCBRN2 commando ) ) for getting the Angle and SCBUS(fromBus, 'VA') / SCBRN(fromBus, toBus, 'IA' ) for getting the impedance.

Is there another way of doing it? like a SCIMPEDANCE or SCANGLE retrieval commando?

I'm running into problem with getting values for the impedance that concur with the one PSSE presents after doing SCMU/SCOP graphically because sometimes it means me dividing 0 V / the retrieved 'IA'-SCBRN2-current when trying to get ZA because the fault is in phase A ( = 0 V)

Kind Regards

Thank you very much nwilson! It helped a lot

Say I got 5 buses connected to one another in the order 111-222-333-444-555.

Is there a command to list the buses directly connected to bus 333 (that is 222 and 444)?

What I'm trying to do is to get hold of the short circuit currents (SCBRN2-method) going from bus 333 to bus 222 and from bus 444 to bus 333 after a Line-To-Ground Fault has been made in bus 111.

The problem is that I actually don't know how the buses are connected to one another. I just know the fault bus and the "solution output"-bus and the SCBRN2-method requires me to enter both from and to buses.