Even after doing everything, this error prompts out. Please help me out with this issue.
Warning: Matrix is singular to working precision. > In mplinsolve (line 75) In newtonpf (line 110) In runpf (line 260) Regards Surbhi Aggarwal On Mon, Sep 14, 2020 at 7:31 PM Ray Daniel Zimmerman <r...@cornell.edu> wrote: > You would have to confirm the cause of the non-convergence before drawing > any conclusions. You may find FAQ #5 > <https://matpower.org/doc/faq/#pfconvergence> helpful. > > Ray > > On Sep 12, 2020, at 6:43 AM, Surbhi Aggarwal <surbhiaggarwa...@gmail.com> > wrote: > > Hello > If the system does not converge within 10 iterations, can we say that it > is one of the most severely affected lines in contingency studies? > Or any other explanation for this non-convergence? > Regards > Surbhi Aggarwal > > > On Sat, Sep 12, 2020 at 10:40 AM Surbhi Aggarwal < > surbhiaggarwa...@gmail.com> wrote: > >> Hello >> Thank you all for your help and I'll definitely look out for the >> solutions. >> Thank you so much >> Regards >> Surbhi Aggarwal >> >> >> On Fri, Sep 11, 2020 at 7:16 PM Ray Daniel Zimmerman <r...@cornell.edu> >> wrote: >> >>> Hi Surbhi, >>> >>> It looks like you were using the default Newton power flow. To increase >>> the number of iterations, you can increase the pf.nr.max_it option. >>> However, this is rarely necessary. If the Newton method is going to >>> converge, it usually does so in less than the default 10 iterations. If it >>> is not converging within 10 iterations, it is likely that the problem has >>> no solution or that you need a better starting point. >>> >>> Ray >>> >>> >>> On Sep 11, 2020, at 5:48 AM, Mirish Thakur <mirishtha...@gmail.com> >>> wrote: >>> >>> Hi Surbhi, >>> >>> First of all why do you want to increase the number of steps/ iterations >>> in the calculation? Is there any specific need? Actually the number of >>> iterations depends on the power flow optimization tolerance. Maybe you can >>> focus on the mpoption function and read it carefully. You can update >>> something like here: >>> mpopt = mpoption('pf.alg', 'FDXB', 'pf.tol', 1e-4) >>> I'm not 100 % sure about it but it may help you. Thanks. >>> >>> Kind regards >>> Mirish >>> >>> On Fri, Sep 11, 2020 at 8:41 AM Surbhi Aggarwal < >>> surbhiaggarwa...@gmail.com> wrote: >>> >>>> 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 <r...@cornell.edu> >>>> 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 <mirishtha...@gmail.com> >>>>> 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 < >>>>> surbhiaggarwa...@gmail.com> 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 >>>>>> >>>>> >>>>> >>> >
