Hello Everyone, I tried your suggestions and it somehow helped me. Now my doubt is " If I want to increase my number of iterations, what steps I have to do"? Please help me out Regards Surbhi Aggarwal
On Wed, Sep 9, 2020 at 7:50 PM Ray Daniel Zimmerman <[email protected]> wrote: > I also suspect that the network becomes disconnected by removing certain > lines. You can check the connectivity using case_info() > <https://matpower.org/docs/ref/matpower7.0/lib/case_info.html> or > find_islands() > <https://matpower.org/docs/ref/matpower7.0/lib/find_islands.html>. If > there are islands, then each island needs to have its own reference bus, > and the local generation needs to be able to meet the local load in each > island. > > Ray > > > On Sep 9, 2020, at 4:57 AM, Mirish Thakur <[email protected]> wrote: > > Hi Surbhi, > > Could you please check the continuity of the system before running opf? I > mean to say if you run opf for (n-1) criteria the system should be still > well connected. There shouldn't be any island within the system itself. > Perhaps you can test your model by removing any one parallel line (which > you can observe later for analysis) and run the model under (n-1) criteria. > This could be the easiest way to test the model. Thank you. > > Kind regards > Mirish > > > On Wed, Sep 9, 2020 at 9:11 AM Surbhi Aggarwal <[email protected]> > wrote: > >> Dear All, >> I am working on optimal power flow to find the contingency (N-1) >> situation of the system. For some of the line outage, certain output pops >> out >> >> MATPOWER Version 7.0, 20-Jun-2019 -- AC Power Flow (Newton) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> Warning: Matrix is singular to working precision. >> > In mplinsolve (line 75) >> In newtonpf (line 110) >> In runpf (line 260) >> >> Newton's method power flow (power balance, polar) did not converge in 10 >> iterations. >> >> >>>>> Did NOT converge (7.38 seconds) <<<<< >> >> What to do to correct this error. It would be of great help. >> Regards >> Surbhi Aggarwal >> > >
