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psspy module not found in PSS/E 34

asked 2015-11-06 09:53:09 -0500

chaupa gravatar image

I am using PSS/E 34 and I have scripts that worked well in version 33. When I use the same script on my cases in version 34 I get the error: "No module named ppspy". I later noticed that this module and the associated drivers were absent in the bin folder. I have reinstalled the application but the problem still persists. There is no information in the documentation that mentions any change in module name or setup. Is there anything I'm missing or this could be a vendor problem?

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answered 2015-11-06 19:46:44 -0500

jconto gravatar image

updated 2016-08-01 20:07:14 -0500

Starting from v.34 PSSPY is not located at the same path as PSSe, but within its own folder. Use the following code when developing for both v.33 and v.34 (psseversion and pssepath are defined above these code, according to your installation):

   import psse34               # it sets new path for psspy
import psspy
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I was trying to use it for PSSEXplore 34 with the following block of codes. import pssexplore34 exam_path = pssexplore34.EXAM_PATH import psspy psspy.psseinit() But getting the following error. TypeError: _set_psse_loc() got an unexpected keyword argument 'xplore'

Riyasat gravatar imageRiyasat ( 2016-06-13 22:48:27 -0500 )edit

answered 2016-12-14 18:00:19 -0500

Tianyu gravatar image

updated 2016-12-20 14:55:45 -0500

Hi there,

The problem is due to that psspy.pyc is no longer in the same folder as the psse.exe, which is case for older versions.

To import the psspy module of PSSE Xplore 34, you should specify the two paths separately for sys.path and os.environ['PATH']. The following codes work if you installed your PSSE Xplore 34 in the default folder.

import os
import sys
sys_path_PSSE=r'C:\Program Files (x86)\PTI\PSSEXplore34\PSSPY27'  #or where else you find the psspy.pyc
os_path_PSSE=r' C:\Program Files (x86)\PTI\PSSEXplore34\PSSBIN'  # or where else you find the psse.exe
os.environ['PATH'] += ';' + env_path_PSSE
import psspy
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Thank you very much for your kind help in this matter, really appreciate as I was facing same problem.

vijay gravatar imagevijay ( 2017-03-13 01:58:09 -0500 )edit

answered 2015-11-07 14:26:11 -0500

chaupa gravatar image

Your reputation indeed does precede you jconto! Thank you so much. It worked perfectly for me.

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The help provide by jconto is extremely useful, thanks to save us always.

vijay gravatar imagevijay ( 2017-03-13 01:57:24 -0500 )edit

answered 2017-04-24 22:21:20 -0500

TGubitz gravatar image

Here is my answer. I modified some different things I found and came up with this. You cannot execute psse34 because that is not the software package available with PSSExplore34. This code is located in the a folder titled "C:\IEEE39".

import os
import sys
import pdb

sys_path_PSSE=r'C:\Program Files (x86)\PTI\PSSEXplore34\PSSPY27'  #or where else you find the psspy.pyc

os_path_PSSE=r'C:\Program Files (x86)\PTI\PSSEXplore34\PSSBIN'  # or where else you find the psse.exe
os.environ['PATH'] += ';' + os_path_PSSE
os.environ['PATH'] += ';' + sys_path_PSSE

PYTHONLIB = r'C:\Program Files (x86)\PTI\PSSE34EXplore\PSSLIB'
PYTHONPRM = r'C:\Program Files (x86)\PTI\PSSE34EXplore\PSSPRM'


import pssexplore34
import pssarrays
import redirect
import dyntools
import bsntools
import psspy


I then moved the file to the "C:\IEEE39" folder and commented out the portion of the code that was problematic. I am not sure if this is fool proof, but I am no longer getting the error.

import os, psseloc

_FPTH, _FNAM_EXT = os.path.split(os.path.abspath( __file__ ))
_FNAM, _FEXT     = os.path.splitext(_FNAM_EXT)
_PSSE_VRSN = int(_FNAM[-2:])

#EXAM_PATH = psseloc._set_psse_loc(_PSSE_VRSN, Xplore=True)
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This helped me a lot, commenting that last line in was key.

jpfize gravatar imagejpfize ( 2017-04-26 10:46:52 -0500 )edit

answered 2016-08-02 19:34:15 -0500

hi jconto.

I am trying to learn PSSE and python. Could you please give me the full code to import psspy. I am using PSSE Xplore 34 version.

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For v.34 I will have, <>=next line: import os, sys<> psseversion = 34<> pssepath = raw"""c:\Program...\PSSe34\bin\""" #according to your installation<> import pss34<> import psspy<>

jconto gravatar imagejconto ( 2016-08-03 21:03:00 -0500 )edit

Hi Jconto, I also have the same problem with PSSE Xplore 34 (not the standard 34). Does it mean that the PSSE Xplore 34 does not provide the access to use psspy? Could you comment on this? Thanks! Tianyu

Tianyu gravatar imageTianyu ( 2016-08-06 12:19:06 -0500 )edit

I am not familiar wth the Xplore 34 version, but I will assume you can still use python and psspy. Check in the "example" folder for *.py files, edit them and run them. See how ppspy is being called. You can always send a message to PTI customer support.

jconto gravatar imagejconto ( 2016-08-06 14:40:40 -0500 )edit

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Asked: 2015-11-06 09:53:09 -0500

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Last updated: Apr 24 '17