Which file do I need to send you? please specify it. Regards Surbhi Aggarwal
On Tue, Sep 15, 2020 at 7:03 PM Ray Daniel Zimmerman <[email protected]> wrote: > Looks like the Jacobian is singular. Feel free to send me the case > (off-list) and I’ll have a look. > > Ray > > > On Sep 14, 2020, at 11:35 PM, Surbhi Aggarwal <[email protected]> > wrote: > > 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 <[email protected]> > 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 <[email protected]> >> 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 < >> [email protected]> 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 <[email protected]> >>> 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 <[email protected]> >>>> 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 < >>>> [email protected]> 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 <[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 >>>>>>> >>>>>> >>>>>> >>>> >> >
