sir i have already relaxed my line limits. but it doesn't give any response!
On Wed, Jun 29, 2016 at 6:29 PM, Ray Zimmerman <[email protected]> wrote: > It appears that your solver thinks the problem is infeasible. Try relaxing > the branch flow limits to see if it solves. e.g. > > define_constants; > mpc = loadcase(<your case file>); > mpc.branch(:, RATE_A) = mpc.branch(:, RATE_A) * 2; % double the flow > limits > r = rundcopf(mpc); > > Or instead of doubling the limits, you could temporarily eliminate them > completely. > > mpc.branch(:, RATE_A) = 0; % eliminates line flow limits completely > > > Ray > > > On Jun 29, 2016, at 5:19 AM, anshu dahiya <[email protected]> wrote: > > sir my acopf is running but not the dcopf what may be cause? The error > comes in the matpower is as below: > rundcopf(n84) > > MATPOWER Version 5.1, 20-Mar-2015 -- DC Optimal Power Flow > The interior-point algorithm uses a built-in starting point; > ignoring user-supplied X0. > Exiting: One or more of the residuals, duality gap, or total relative error > has grown 100000 times greater than its minimum value so far: > the primal appears to be infeasible (and the dual unbounded). > (The dual residual < TolFun=1.00e-08.) > > >>>>> Did NOT converge (0.06 seconds) <<<<< > > On Mon, Jun 27, 2016 at 5:44 PM, Saranya A <[email protected]> wrote: > >> Hi Anshu, >> >> Even I faced a similar problem with a different system. In "mpc.branch" >> the 6th, 7th and 8th columns represent RATE A - MVA rating A (long term >> rating) ,RATE B - MVA rating B (short term rating), RATE C - MVA rating C >> (emergency rating) respectively. Try giving a high MVA rating to all the 3 >> columns and check if your solution converges. >> >> Regards, >> Saranya.A >> >> On Mon, Jun 27, 2016 at 1:08 PM, anshu dahiya <[email protected]> >> wrote: >> >>> i have double check my data it is giving the below error: >>> *runopf(c84)* >>> >>> *MATPOWER Version 5.1, 20-Mar-2015 -- AC Optimal Power Flow* >>> *MATLAB Interior Point Solver -- MIPS, Version 1.2, 20-Mar-2015* >>> * (using built-in linear solver)* >>> *Numerically Failed* >>> >>> *Did not converge in 6 iterations.* >>> >>> *>>>>> Did NOT converge (0.09 seconds) <<<<<* >>> >>> >>> On Mon, Jun 27, 2016 at 11:51 AM, Fiaz Ahmad <[email protected]> >>> wrote: >>> >>>> If there is no syntax error then check your branch matrix. It has high >>>> R and X values,it will not converge. Probably you are not using the correct >>>> per unit values. Your zbase=vbase*vbase/mvabase. Use zbase to find p.u >>>> values for R and X. >>>> >>>> I hope it helps >>>> On Jun 27, 2016 8:53 AM, "anshu dahiya" <[email protected]> >>>> wrote: >>>> >>>> sir my system is not converging while performing opf and dcopf , what >>>> should i check in my program. Plz help me >>>> >>>> On Sun, Jun 26, 2016 at 5:53 AM, anshu dahiya <[email protected]> >>>> wrote: >>>> >>>>> the problem is still as it was. my 84 bus system is still not >>>>> converging after applying all steps directed by the Dr. Ray Zimmerman . >>>>> can >>>>> anyone help me to make the system converge. i am attaching my file >>>>> >>>>> On Fri, Jun 24, 2016 at 6:24 PM, Ray Zimmerman <[email protected]> >>>>> wrote: >>>>> >>>>>> See FAQ #5 <http://www.pserc.cornell.edu/matpower/#pfconvergence>. >>>>>> >>>>>> Ray >>>>>> >>>>>> >>>>>> On Jun 24, 2016, at 3:42 AM, anshu dahiya <[email protected]> >>>>>> wrote: >>>>>> >>>>>> my 84 bus system is not converging into 10 iteration. what should i >>>>>> take steps to make it converge. >>>>>> >>>>>> On Thu, Jun 23, 2016 at 8:43 PM, Ray Zimmerman <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> Whenever you have a problem with a case file, the first thing to do >>>>>>> is always run case_info() >>>>>>> <http://www.pserc.cornell.edu/matpower/docs/ref/matpower6.0b1/case_info.html> >>>>>>> to >>>>>>> check for errors in the connectivity information … >>>>>>> >>>>>>> >> case_info('casem84') >>>>>>> Bad bus numbers: 1 >>>>>>> bus(1, BUS_I) = 0 >>>>>>> >>>>>>> Turns out that bus numbers must be positive integers, as stated in >>>>>>> caseformat >>>>>>> <http://www.pserc.cornell.edu/matpower/docs/ref/matpower6.0b1/caseformat.html> >>>>>>> . >>>>>>> >>>>>>> Ray >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Jun 23, 2016, at 1:59 AM, anshu dahiya <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>> sir how to solve the following error in matpower which comes in the >>>>>>> case84 which i have attached >>>>>>> Error using sparse >>>>>>> Index into matrix must be positive. >>>>>>> >>>>>>> Error in ext2int (line 141) >>>>>>> n2i = sparse(mpc.bus(:, BUS_I), ones(nb, 1), 1:nb, >>>>>>> max(mpc.bus(:, BUS_I)), 1); >>>>>>> >>>>>>> Error in runpf (line 111) >>>>>>> mpc = ext2int(mpc); >>>>>>> >>>>>>> On Wed, Jun 22, 2016 at 6:59 PM, Ray Zimmerman <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> Assuming this is for a power flow problem, you still have to decide >>>>>>>> whether the bus is voltage controlled or not. If so, make it a PV bus. >>>>>>>> If >>>>>>>> not, and the DG simply injects a fixed amount of power without >>>>>>>> controlling >>>>>>>> voltage, then make it a PQ bus. >>>>>>>> >>>>>>>> Ray >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> > On Jun 22, 2016, at 1:27 AM, anshu dahiya < >>>>>>>> [email protected]> wrote: >>>>>>>> > >>>>>>>> > how to nominate DG bus which has load as well as generation >>>>>>>> > the nomenclature in the matpower as below >>>>>>>> > 1= PQ bus >>>>>>>> > 2= PV bus >>>>>>>> > 3= reference bus >>>>>>>> > 4= isolated bus >>>>>>>> > i have attached my file plz take a look of it. suggest me >>>>>>>> solution. >>>>>>>> > <casem84.m> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> <casem84.m> >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >> > >
