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 >>>> >>> >>> >
