Dear Dr ZImmerman I have rectified the above problem. But now when i remove the bus or substation there is some load i will not be able to supply. I am not able to get the value of load being supplied by the system after removing the buses. That value is not getting updated. Is there any fix to this?
Best Regards Ashwin Venkataramanan On Mon, Apr 22, 2013 at 1:19 PM, Ray Zimmerman <[email protected]> wrote: > 1) Make sure that when you isolate a bus you set it's BUS_TYPE to NONE and > that your system still has a REF bus. > 2) I'm not sure what you mean, but you can always load the case and make > changes before running it, like … > > define_constants; > mpc = loadcase('case118'); > mpc.branch(110, BR_STATUS) = 0; > r = runopf(mpc); > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Apr 20, 2013, at 10:53 PM, Ashwin Venkataramanan <[email protected]> > wrote: > > Dear Dr.Zimmerman > > I am a graduate student in electrical engineering from > Arizona state university. I have a doubt about opening buses using > MATPOWER. I have two questions. > > 1) My simulation involves removing a substation out of the network > and testing if the power flow converges. Just like first contingency > analysis for substations. Each bus is characterized as a substation or in > some cases combination of 2 buses are classified as substation. I have read > the MATPOWER user manual, from which I find only ways to remove branches > and generator from the network. I have tried the simulation by removing the > branches connected to the bus using the command > > mpc.branch(110,BR_STATUS)=0; > > for removing the branch 110 which may connect two buses. Similarly > removing all the branches connected to a bus in order to isolate a bus. I > believe this approach is right to remove a bus. But my powerflow diverges > each time I remove any bus(or substation). I believe this will not be a > case as system most of time must work for first contingency involving > substation. I have tested my code on both 118 and 30 bus case. Is there any > way to remove bus directly off other than removing using the branches(above > mentioned approach) ? > > 2) Is there any way to do convert the existing “case118.m” to modified > 118 bus? > > Best Regards > > Ashwin Venkataramanan > > Arizona state university > > >
