It really depends on why the matrix is singular … and I have no way to know. My guess is that the most likely reason is an error in the input data somewhere … an isolated bus or set of buses, a zero impedance branch … something like that.
Ray -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Jan 5, 2013, at 6:39 PM, Dirk Van Hertem <dirk.vanher...@ieee.org> wrote: > Hi, > > You can try to convert (part of) your loads from PQ loads to impedance loads > (shunt elements with the same P and Q at nominal voltage). This should help > making your matrix less singular. > > Best regards, > > Dirk > > On 01/05/2013 01:33 PM, Hwachang SONG wrote: >> >> Dear Prof. Zimmerman, >> >> Recently, I applied matpower power flow for a converted real power system >> with 2018 buses. >> But the simulation does not converge, with the following message: >> >> Warning: Matrix is singular to working precision. >> > In newtonpf at 109 >> In runpf at 220 >> >> And the bus voltages and angles are all NaN. >> >> Is there any method to fix this problem? >> >> Thanks. >> >> Hwachang Song >> >> >> >> >> >> >> Hwachang SONG (Ph.D.) >> Associate Professor >> Dept. of Electrical and Information Engineering >> Seoul Nat'l Univ. of Science and Technology (SeoulTech) >> Republic of Korea >> Phone: +82-2-970-6403 >> Mobile: +82-10-7322-4605 >> Fax: +82-2-978-2754 > > > -- > Dirk Van Hertem > Assistant Professor > Research division ELECTA > Department of electrical engineering (ESAT) > KU Leuven, Belgium > dirk.vanher...@esat.kuleuven.be Tel.: 003216372415 >
