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Constructing a Short Circuit Equivalent

asked 2017-08-24 18:15:16 -0500

Gary22212 gravatar image

updated 2017-09-01 12:59:41 -0500

jconto gravatar image

Hello everyone,

I was trying to constructing a short circuit equivalent (psspy.sceq) which was introduced in chapter 9.10, Program Operation Manual, but when I run the program it always showed that "case is not under classical assumptions",

I have carried out the flat with choosing the set classical short circuit assumptions, but it doesn't help, could anyone please enlight me what's the problem is? My code is as follows:

import os, sys
PYTHONPATH = r'C:\Program Files (x86)\PTI\PSSE33\PSSBIN'
sys.path.append(PYTHONPATH)
os.environ['PATH'] += ';' + PYTHONPATH

import psspy    
import redirect

def equivalent():
    global pp        
    redirect.psse2py()   
    psspy.psseinit(buses=1000)    
    psspy.read(0,pp+'.raw')

    psspy.fdns(0)        
    psspy.flat_2([1,0,0,0,0,0,0,0],[0.0,0.0])

    psspy.cong(2)
    psspy.conl(0,1,1,[0,0],[ 100.0,0.0,0.0, 100.0])
    psspy.conl(0,1,2,[0,0],[ 100.0,0.0,0.0, 100.0])
    psspy.conl(0,1,3,[0,0],[ 100.0,0.0,0.0, 100.0])

    psspy.bsys(1,0,[ 13.8, 500.],1,[1],0,[],0,[],0,[])        
    psspy.sceq(1,0,0, 10.0,pp + '2' + '.raw',pp + '2' + '.seq')

if __name__ == '__main__': 
    global pp      
    pp = r'C:\Program Files (x86)\PTI\PSSE33\EXAMPLE\savnw'   
    equivalent()

Thank you all in advance!

Gary

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answered 2017-09-03 10:38:55 -0500

perolofl gravatar image

You must use

psspy.flat_2([1,0,0,0,0,0,0,1],[0.0,0.0])

i.e. ignore the load in all three sequences.
You should start with a network including sequence data, i.e. savnw.sav instead of savnw.raw, in order to get an equivalent also for unbalanced faults

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Thanks for your guidance!

Gary22212 gravatar imageGary22212 ( 2017-09-04 15:37:07 -0500 )edit

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Asked: 2017-08-24 18:15:16 -0500

Seen: 1,244 times

Last updated: Sep 03 '17