Yes, i report a little part of mpc.branch (F_BUS , T_BUS , BR_R , BR_X , BR_B):
1 605 0,0162000000000000 0,00930000000000000 0,157600000000000 1 76 0,000800000000000000 0,000600000000000000 0,0880000000000000 1 196 0,00240000000000000 0,00260000000000000 0,158200000000000 1 375 0,00570000000000000 0,00910000000000000 0,0993000000000000 1 5 0,000300000000000000 0,000300000000000000 0,0385000000000000 1 62 0,00150000000000000 0,000900000000000000 0,128200000000000 1 9 0,00520000000000000 0,00150000000000000 0,131400000000000 9 12 0,00420000000000000 0,00110000000000000 0,0822000000000000 9 16 0,00370000000000000 0,000700000000000000 0,0465000000000000 16 19 0,00370000000000000 0,000700000000000000 0,0465000000000000 19 58 0,00220000000000000 0,000600000000000000 0,0438000000000000 19 22 0,00330000000000000 0,000600000000000000 0,0418000000000000 22 54 0,00350000000000000 0,000900000000000000 0,0685000000000000 22 25 0,00690000000000000 0,00190000000000000 0,163100000000000 25 31 0,000100000000000000 0,000100000000000000 0,00300000000000000 25 28 0,0126000000000000 0,00250000000000000 0,160400000000000 31 34 0,000100000000000000 0,000100000000000000 0,00300000000000000 34 37 0,00810000000000000 0,00230000000000000 0,192800000000000 34 50 0,00250000000000000 0,000700000000000000 0,0493000000000000 37 46 0,00560000000000000 0,00140000000000000 0,109600000000000 Values seem to be "normal"... 2014-12-01 22:33 GMT+01:00 Ray Zimmerman <[email protected]>: > Sounds like it is likely a problem with the parameters. Are you sure you > used per unit values for your line parameters? > > Ray > > > On Dec 1, 2014, at 3:30 PM, Marco Barbetta <[email protected]> > wrote: > > > > Dear Prof. Zimmerman, i fixed some days ago the problem: 1 bus was > > isolated and some values of branch electrical parameters (r,x,b) were > > too much high or too much low (for example r = x = b = 0). > > > > The last problem is that my network has too much high values of power > > losses: 15 MW of real power losses with 5 MW of loads. I don't > > understand if there is a problem of parameters, or a problem in the > > network's structure, or if it's a problem of algorithm. > > > > Thank you for your answer. > > > > Marco Barbetta > > > > 2014-12-01 21:21 GMT+01:00, Ray Zimmerman <[email protected]>: > >> I’m not sure where the problem lies, but have you checked that it is a > >> connected network using the case_info() function? > >> > >> Ray > >> > >> > >> > >>> On Nov 25, 2014, at 5:59 AM, Marco Barbetta < > [email protected]> > >>> wrote: > >>> > >>> Dear collegues, > >>> > >>> i succeded to run my program (i fixed the problem that MatPower doesn't > >>> recognize the slack bus if there is no generation in it, as i said in > >>> http://www.mail-archive.com/matpower-l%40cornell.edu/msg03745.html > >>> <http://www.mail-archive.com/matpower-l%40cornell.edu/msg03745.html>), > but > >>> i get this warning: > >>> > >>> Warning: Matrix is singular to working precision. > >>>> In newtonpf at 108 > >>>> In runpf at 224 > >>> > >>> newtonpf at 108 is this row ---> dx = -(J \ F); %% compute update > >>> step > >>> > >>> runpf at 224 is this row ---------> [V, success, iterations] = > >>> newtonpf(Ybus, Sbus, V0, ref, pv, pq, mpopt); > >>> > >>> The problem is that, obviously, my program doesn't converge. In your > >>> opinion, where is the problem? > >>> > >>> Thank you for help, > >>> > >>> Marco Barbetta > >> > >> > > > > > > > >
