Error running PSSE from Python

asked 2017-03-12 03:42:58 -0500

Cynthia Hsu
15 ●9 ●10 ●12

I'm new to PSS/E. And I want to run dynamic simulation in PSS/E. But encounter some problems when running PSS/E from python/. Here's the error from PSS/E when I try to open .py file in PSS/E:

Traceback (most recent call last): File "C:\Users\Cynthia\Desktop\0312.py", line 11, in <module> redirect.psse2py() File ".\redirect.py", line 147, in psse2py redirect.RedirectError: Python currently sending output to Psse Couldn't open Python file:C:\Users\Cynthia\Desktop\0312.py

And here's my code:

import os,sys

PYTHONPATH = r'C:\Program Files (x86)\PTI\PSSEXplore34\PSSPY27'
sys.path.append(PYTHONPATH)
os.environ['PATH'] += ';' + PYTHONPATH

import psspy
import redirect

# Redirect output from PSSE to Python:
redirect.psse2py()

# Last case:
CASE = r"C:\Program Files (x86)\PTI\PSSEXplore34\EXAMPLE\savnw.sav"
psspy.psseinit(12000)
psspy.case(CASE)

# Convert loads (3 step process):
psspy.conl(-1,1,1)
psspy.conl(-1,1,2,[0,0],[100,0,0,100])
psspy.conl(-1,1,3)

# Convert generators:
psspy.cong()

# Solve for dynamics
psspy.ordr()
psspy.fact()
psspy.tysl()

# Save converted case
case_root = os.path.splitext(CASE)[0]
psspy.save(case_root + "_C.sav")

# Add dynamics data
psspy.dyre_new(dyrefile="C:\Program Files (x86)\PTI\PSSEXplore34\EXAMPLE\savnw.dyr")

# Add channels by subsystem
#   BUS VOLTAGE
psspy.chsb(sid=0,all=1, status=[-1,-1,-1,1,13,0])

# Save snapshot
psspy.snap(sfile="C:\Program Files (x86)\PTI\PSSE32\EXAMPLE\python_test.snp")

# Initialize
psspy.strt(outfile="C:\Program Files (x86)\PTI\PSSE32\EXAMPLE\python_test_1.out")
psspy.run(tpause=1)

# 3-phase fault on bus 201 (default bus fault is a 3phase and there is no bus 200)
psspy.dist_bus_fault(ibus=201)

# Run to 3 cycles
time = 3.0/60.0 + 1
psspy.run(tpause=time)

# Clear fault (assuming only part of bus faults)
psspy.dist_clear_fault()
psspy.dist_branch_trip(ibus=201, jbus=151, id='1')

# Run to 20 seconds
time = 10

Thanks a lot for your help!!!

answered 2017-03-12 14:42:39 -0500

jconto
2701 ●10 ●30 ●41

updated 2017-03-12 15:45:26 -0500

When running from PSSe GUI, PSSe send output to its GUI and python sends output to the PSSe GUI by default, so there is no need to redirect to 'python'. Your error fits this scenario. When running outside the PSSe GUI (within a DOS window, using line command) then you can send PSSe output to python using the redirect module. A little modified version of your code set to run outside the PSSe GUI (adjust path as needed) follows [to run in PSSe GUI comment lines 3 to 11]:

import os, sys

PYPATH = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY27'
sys.path.append(PYPATH)
os.environ['PATH'] += ';' + PYPATH
import psspy

psspy.psseinit(12000)
import redirect
# Redirect output from PSSE to Python:
redirect.psse2py()

CASE = r'''C:\\Program Files (x86)\\PTI\\PSSE34\\EXAMPLE\\savnw.sav'''
psspy.case(CASE)

# Convert loads (3 step process):
psspy.conl(-1,1,1)
psspy.conl(-1,1,2,[0,0],[100,0,0,100])
psspy.conl(-1,1,3)

# Convert generators:
psspy.cong()

# Solve for dynamics
psspy.ordr()
psspy.fact()
psspy.tysl()

# Save converted case
case_root = os.path.splitext(CASE)[0]
psspy.save(case_root + "_C.sav")

# Add dynamics data
psspy.dyre_new(dyrefile="C:\\Program Files (x86)\\PTI\\PSSE34\\EXAMPLE\\savnw.dyr")

# Add channels by subsystem
#   BUS VOLTAGE
psspy.chsb(sid=0,all=1, status=[-1,-1,-1,1,13,0])

# Save snapshot
psspy.snap(sfile="test.snp")

# Initialize
psspy.strt(outfile="test.out")
simtime = 1
#psspy.run(tpause=simtime)
psspy.run(0,simtime,99,19,0)

# 3-phase fault on bus 201 (default bus fault is a 3phase and there is no bus 200)
psspy.dist_bus_fault(ibus=201)

# Run under fault for 3 cycles
simtime += 3.0/60.0
#psspy.run(tpause=simtime)
psspy.run(0,simtime,99,3,0)

# Clear fault (assuming only part of bus faults)
psspy.dist_clear_fault()
psspy.dist_branch_trip(ibus=201, jbus=151, id='1')

# Run to 20 seconds
simtime = 5
#psspy.run(tpause=simtime)
psspy.run(0,simtime,99,9,0)