Thank you.
----- Original Message ----- From: Ray Zimmerman <[email protected]> Date: Monday, October 6, 2008 4:33 pm Subject: Re: Load flow problem To: MATPOWER discussion forum <[email protected]> > MATPOWER does not currently have the ability to handle cases with > isolated buses. Manually creating a modified case file and > excluding > the isolated buses is an option. In fact, it shouldn't be too > difficult to write a function that automatically strips out > isolated > buses. > > -- > Ray Zimmerman > Senior Research Associate > 428-B Phillips Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > On Oct 6, 2008, at 3:58 PM, Sridhar Chouhan Jr wrote: > > > Dear Mr.Ray, > > > > I have a problem with load flow solution of particular case file. > > > Here I > > am attaching the case file with the mail. > > > > In my case file, I created some faults in the network(Branches > (9,10)> (10,11) and (11,12) are turned 'off') such that the load at > bus 10 is > > not supplied. > > when I run the powerflow....runpf('mycase1'), The solution looks > > like as > > follows > > > > = > > = > > = > > = > > = > > = > > = > > = > > = > > = > > > ======================================================================> | Bus Data > > | > > = > > = > > = > > = > > = > > = > > = > > = > > = > > = > > > ======================================================================> Bus Voltage Generation Load > > # Mag(pu) Ang(deg) P (MW) Q (MVAr) P (MW) Q (MVAr) > > ----- ------- -------- -------- -------- -------- -------- > > 1 1.000 0.000 22.85 7.35 - - > > 2 0.969 -2.611 - - 3.31 1.79 > > 3 0.960 -2.776 - - 2.13 1.15 > > 4 0.946 -3.844 - - 2.56 1.38 > > 5 0.963 -2.751 - - 0.93 0.50 > > 6 0.962 -2.776 - - - - > > 7 0.961 -2.784 - - - - > > 8 0.957 -3.023 - - 2.07 1.12 > > 9 0.948 -3.901 - - 2.42 1.31 > > 10 NaN NaN - - 1.26 0.68 > > 11 NaN NaN - - - - > > 12 0.981 -1.623 - - 1.33 0.78 > > 13 0.992 -0.969 - - 5.34 2.99 > > 14 1.000 -1.524 3.00 7.99 - - > > 15 0.982 -1.536 - - 2.67 1.44 > > 16 1.000 -1.524 - - - - > > 17 0.972 -1.819 - - - - > > 18 0.964 -2.192 - - 2.67 1.44 > > -------- -------- -------- -------- > > Total: 25.85 15.34 26.69 14.58 > > > > > > > > Does this mean we can't solve the power flow.? > > Can't the Matpower take the connected part of the network only > and do > > load flow for that part? > > > > > > Thanks in advance. > > > > > > Sridhar Chouhan. > > > > > > > > > > > > <mycase1.m> > > >
