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 <r...@cornell.edu>: > 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 <marco.barbetta1...@gmail.com> >> 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 > >
