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Hi!

I try to change the load at a bus in a loop. Although it successfully changes the load each iteration it only uses the first load change (outputs same results for each iteration). How do i solve this?

busA = int(input('Enter BusA: '))
busB = int(input('Enter BusB: '))
cktAB = str(input('Enter line ID (usually 1): '))

fdist = float(input('Fault distance from BusA [%]: '))
Rff = float(input('Fault resistance [Ohm]: '))
Rf = Rff/((135*135*1e3)/mvabas)

busL = int(input('Enter load bus: '))
Pmax = int(input('Enter maximum P: '))
QPr = float(input('Enter Q/P ratio: '))

psspy.psseinit(0)
psspy.case(CASE)

_i, _f = psspy.getbatdefaults()
for P in range(0,Pmax,50):
    ierr = psspy.load_chng_5(busL,r"""SC""",[_i,_i,_i,_i,_i,_i,_i],[float(P),Qpr*float(P),_f,_f,_f,_f,_f,_f])
    psspy.fnsl()
        options1=0, # disable tap stepping adjustment.
        options5=0, # disable switched shunt adjustment.
    )

    psspy.scmu_2(1,[_i,_i,_i,_i,_i,_i,_i],[_f,_f,_f,_f,_f],cktAB)     # Need to run this first
    psspy.scmu_2(2,[9,busA,busB,1,1,0,0],[Rf,0.0,0.0,0.0,float(fdist)/100],cktAB)   # Fault
    psspy.scmu_2(3,[_i,_i,_i,_i,_i,_i,_i],[_f,_f,_f,_f,_f],cktAB)   # Clear fault

    psspy.scinit()

    error, brnchIPOS_A =  psspy.scbrn2(busA,999999,cktAB,"IPOS")
    error, brnchINEG_A =  psspy.scbrn2(busA,999999,cktAB,"INEG")
    error, brnchIZERO_A = psspy.scbrn2(busA,999999,cktAB,"IZERO")
    error, brnchIA_A =  psspy.scbrn2(busA,999999,cktAB,"IA")
    error, brnchIB_A =  psspy.scbrn2(busA,999999,cktAB,"IB")
    error, brnchIC_A =  psspy.scbrn2(busA,999999,cktAB,"IC")
    error, brnchIPOS_B =  psspy.scbrn2(busB,999999,cktAB,"IPOS")
    error, brnchINEG_B =  psspy.scbrn2(busB,999999,cktAB,"INEG")
    error, brnchIZERO_B = psspy.scbrn2(busB,999999,cktAB,"IZERO")
    error, brnchIA_B =  psspy.scbrn2(busB,999999,cktAB,"IA")
    error, brnchIB_B =  psspy.scbrn2(busB,999999,cktAB,"IB")
    error, brnchIC_B =  psspy.scbrn2(busB,999999,cktAB,"IC")

    psspy.scdone()

Hi!

I try to change the load at a bus in a loop. Although it successfully changes the load each iteration it only uses the first load change (outputs same results for each iteration). How do i solve this?

busA = int(input('Enter BusA: '))
busB = int(input('Enter BusB: '))
cktAB = str(input('Enter line ID (usually 1): '))

fdist = float(input('Fault distance from BusA [%]: '))
Rff = float(input('Fault resistance [Ohm]: '))
Rf = Rff/((135*135*1e3)/mvabas)

busL = int(input('Enter load bus: '))
Pmax = int(input('Enter maximum P: '))
QPr = float(input('Enter Q/P ratio: '))

psspy.psseinit(0)
psspy.case(CASE)

_i, _f = psspy.getbatdefaults()
for P in range(0,Pmax,50):
    ierr = psspy.load_chng_5(busL,r"""SC""",[_i,_i,_i,_i,_i,_i,_i],[float(P),Qpr*float(P),_f,_f,_f,_f,_f,_f])
    psspy.fnsl()
        options1=0, # disable tap stepping adjustment.
        options5=0, # disable switched shunt adjustment.
    )

    psspy.scmu_2(1,[_i,_i,_i,_i,_i,_i,_i],[_f,_f,_f,_f,_f],cktAB)     # Need to run this first
    psspy.scmu_2(2,[9,busA,busB,1,1,0,0],[Rf,0.0,0.0,0.0,float(fdist)/100],cktAB)   # Fault
    psspy.scmu_2(3,[_i,_i,_i,_i,_i,_i,_i],[_f,_f,_f,_f,_f],cktAB)   # Clear fault

    psspy.scinit()

    error, brnchIPOS_A =  psspy.scbrn2(busA,999999,cktAB,"IPOS")
    error, brnchINEG_A =  psspy.scbrn2(busA,999999,cktAB,"INEG")
    error, brnchIZERO_A = psspy.scbrn2(busA,999999,cktAB,"IZERO")
    error, brnchIA_A =  psspy.scbrn2(busA,999999,cktAB,"IA")
    error, brnchIB_A =  psspy.scbrn2(busA,999999,cktAB,"IB")
    error, brnchIC_A =  psspy.scbrn2(busA,999999,cktAB,"IC")
    error, brnchIPOS_B =  psspy.scbrn2(busB,999999,cktAB,"IPOS")
    error, brnchINEG_B =  psspy.scbrn2(busB,999999,cktAB,"INEG")
    error, brnchIZERO_B = psspy.scbrn2(busB,999999,cktAB,"IZERO")
    error, brnchIA_B =  psspy.scbrn2(busB,999999,cktAB,"IA")
    error, brnchIB_B =  psspy.scbrn2(busB,999999,cktAB,"IB")
    error, brnchIC_B =  psspy.scbrn2(busB,999999,cktAB,"IC")

    psspy.scdone()