MATPOWER does not handle 3 winding transformers directly, so you would have to convert it to an equivalent star formation of 2 winding transformers. The psse2mpc() function can convert a 3-winding transformers in PSS/E RAW format into the equivalent for MATPOWER, in case that would be useful.
Ray > On Nov 27, 2019, at 12:24 PM, Winnie apiyo <winnieapiy...@gmail.com> wrote: > > Ray, > Bus 92 was missing. I have f 400 kV , 220 kV, 132 kv , 66 kV, 33 kV and > 11kV voltage levels. How do you model three winding transformers? > > i have the following error after running pf > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > Warning: Matrix is singular to working precision. > > In newtonpf (line 89) > In runpf (line 204) > > > Newton's method power flow did not converge in 10 iterations. > > >>>>> Did NOT converge (0.17 seconds) <<<<< > > On Wed, Nov 27, 2019 at 7:13 PM Ray Zimmerman <r...@cornell.edu > <mailto:r...@cornell.edu>> wrote: > Do you have some bus numbers (either in the bus or branch matrix) that are > not positive integers? > > Ray > > >> On Nov 27, 2019, at 6:14 AM, Winnie apiyo <winnieapiy...@gmail.com >> <mailto:winnieapiy...@gmail.com>> wrote: >> >> Good evening Ray, >> It is now running but with this error: >> Array indices must be positive integers or logical values. >> >> Error in ext2int (line 148) >> bs(n2i(mpc.branch(:, F_BUS))) & ... >> >> Error in runpf (line 109) >> mpc = ext2int(mpc); >> >> On Tue, Nov 26, 2019 at 10:58 PM Ray Zimmerman <r...@cornell.edu >> <mailto:r...@cornell.edu>> wrote: >> You’ll have to show us exactly what commands you are using to attempt to run >> it. It sounds like you may be calling runpf(mpc) without first loading the >> case into mpc. Normally, you’d do something like … >> >> mpc = loadcase('case118'); >> results = runpf(mpc); >> >> … or simply … >> >> results = runpf('case118'); >> >> Hope this helps, >> >> Ray >> >> >>> On Nov 26, 2019, at 12:18 PM, Winnie apiyo <winnieapiy...@gmail.com >>> <mailto:winnieapiy...@gmail.com>> wrote: >>> >>> It is only running with no results. mpc empty , undefined function or >>> variable mpc. I have been troubleshooting with no results. What are the >>> possible mistakes? >>> >>> Sent from my iPhone >>> >>>> On 26 Nov 2019, at 20:26, Ray Zimmerman <r...@cornell.edu >>>> <mailto:r...@cornell.edu>> wrote: >>>> >>>> There is no explicit limit to the size. Power flow for a 582 bus case >>>> should be extremely fast, only a fraction of a second. On my 5 yr old >>>> laptop a 13,000 bus system solves in ~0.3 sec. >>>> >>>> Ray >>>> >>>>> On Nov 24, 2019, at 3:12 PM, Winnie apiyo <winnieapiy...@gmail.com >>>>> <mailto:winnieapiy...@gmail.com>> wrote: >>>>> >>>>> Thank you >>>>> >>>>> Sent from my iPhone >>>>> >>>>>> On 24 Nov 2019, at 21:54, Abhay Kumar <abh...@mtu.edu >>>>>> <mailto:abh...@mtu.edu>> wrote: >>>>>> >>>>>> A list of test cases are available in Appendix D (Table D-18 to Table >>>>>> D-23) of the MATPOWER user manual >>>>>> <https://matpower.org/docs/MATPOWER-manual.pdf> I’m not sure if there >>>>>> is a limit but MATPOWER can definitely handle 582 buses. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Abhay Kumar >>>>>> Graduate Teaching Assistant | Michigan Tech | Dept of ECE >>>>>> E: abh...@mtu.edu <mailto:abh...@mtu.edu> >>>>>> A: EERC 617, 1400 Townsend Dr Houghton MI 49931 >>>>>> >>>>>>> On Nov 24, 2019, at 1:33 PM, Winnie apiyo <winnieapiy...@gmail.com >>>>>>> <mailto:winnieapiy...@gmail.com>> wrote: >>>>>>> >>>>>>> good evening, >>>>>>> What is the maximum number of buses that can be run in MATPOWER.? I >>>>>>> have 582 buses and can't run power flow or it is just taking long to run >>>>>>> regards >>>>>> >>>> >> >