Hi thanks for your responses.
Would you please explain a little more what you meant by "system unbalance"? Actually when I increase the reactive limits on the buses the problem was solved. the problem is sometimes it says problem is not converged and in my code, it automatically update the generators reactive support but sometime it breaks out. Thanks, Mahraz On Fri, Aug 11, 2017 at 3:33 PM, Sayandev Ghosh <[email protected]> wrote: > Hello, > > I am not pretty sure but I guess that if the following command appears at > the *very first iteration* then the system is probably unbalanced. > > >Newton's method power flow did not converge in 10 iterations. > > And it may happen that all the PV bus got converted to PQ bus including > reference bus and therefore ref = PV(1) is getting out of index dimension. > I don't know your casedata. But can you check once if the system is > balanced and converged without Q limit check. > > > Thanks > > > *SAYANDEV GHOSH* > Assistant Professor > Electrical Engineering Department > Chaibasa Engineering College, Chaibasa, Jharkhand > Mob. No. - 7292880077 / 9748509620 > > On Fri, Aug 11, 2017 at 10:35 PM, Ray Zimmerman <[email protected]> wrote: > >> I agree this looks like a bug. Can you provide a minimum working example >> that will allow us to reproduce the problem, and please submit a bug report >> <https://github.com/MATPOWER/matpower/blob/master/CONTRIBUTI >> NG.md#reporting-a-bug> to the issue tracker on GitHub? >> >> Thanks, >> >> Ray >> >> > On Aug 10, 2017, at 4:33 PM, mahraz amini <[email protected]> >> wrote: >> > >> > Hi all, >> > >> > I am trying to run power flow on my power network with different load >> profiles, while all generators are enforced to be within their Q limits. >> However, sometime I face this error : >> > >> > Newton's method power flow did not converge in 10 iterations. >> > Gen 17 at upper Q limit, converting to PQ bus >> > Gen 25 at upper Q limit, converting to PQ bus >> > Gen 29 at upper Q limit, converting to PQ bus >> > Gen 18 at lower Q limit, converting to PQ bus >> > Index exceeds matrix dimensions. >> > >> > Error in bustypes (line 43) >> > ref = pv(1); TCL MERGE ERROR ( 08/11/2017 13:06:12 ): >> "missing "" >> OutmailID: 121717098, List: 'matpower-l', MemberID: 78903649 >> SCRIPT: "use the first PV bus > > Error in runpf (line 291) > >> [ref, pv, pq] = bustypes(bus, gen); > > Error in loopACPF_New_h2m >> (line 110) > results = runpf(ps1, mpoption('pf.enforce_q_lims', 1)); > > >> and it jump out of the program. I expect even in case of not converting, it >> should not give any error as some times it gave this comment : > > >> Newton's method power flow converged in 8 iterations. > Gen 19 at lower Q >> limit, converting to PQ bus > Gen 28 at lower Q limit, converting to PQ bus >> > > Newton's method power flow did not converge in 10 iterations. > Gen 25 >> at upper Q limit, converting to PQ bus > Gen 29 at upper Q limit, >> converting to PQ bus > Gen 18 at lower Q limit, converting to PQ bus > > >> Newton's method power flow did not converge in 10 iterations. > All 1 >> remaining gens exceed their Q limits : INFEASIBLE PROBLEM > > >>>>> Did >> NOT converge (0.24 seconds) "<<<\n> \n> which is fine, because it let the >> rest of the code continues to run.\n> \n> So I am wondering if any one has >> any idea why the first case happens and how I can prevent its happening >> .\n> \n> Thanks,\n> \n> Mahraz\n\n\n--Apple-Mail=_04EE >> F415-B5AA-4CB8-A756-2470177F64EC\nContent-Transfer-Encoding: >> quoted-printable\nContent-Type: text/html;\n >> charset=\"us-ascii\"\n\n<html><head><meta http-equiv=\"Content-Type\" >> content=\"text/html charset=us-ascii\"></head><body style=\"word-wrap: >> break-word; -webkit-nbsp-mode: space; -webkit-line-break: >> after-white-space;\" class=\"\">I agree this looks like a bug. Can you >> provide a minimum working example that will allow us to reproduce the >> problem, and please <a href=\"https://github.com/MATP >> OWER/matpower/blob/master/CONTRIBUTING.md#reporting-a-bug\" >> class=\"\">submit a bug report</a> to the issue tracker on GitHub?<div >> class=\"\"><br class=\"\"></div><div class=\"\">Thanks,</div><div >> class=\"\"><br class=\"\"></div><div class=\"\"> Ray</div><div >> class=\"\"><div class=\"\"><br class=\"\"><div><blockquote type=\"cite\" >> class=\"\"><div class=\"\">On Aug 10, 2017, at 4:33 PM, mahraz amini <<a >> href=\"mailto:[email protected]\"; >> class=\"\">[email protected]</a>> >> wrote:</div><br class=\"Apple-interchange-newline\"><div class=\"\"><div >> dir=\"ltr\" class=\"\">Hi all,<div class=\"\"><br class=\"\"></div><div >> class=\"\">I am trying to run power flow on my power network with different >> load profiles, while all generators are enforced to be within their Q >> limits. However, sometime I face this error :</div><div class=\"\"><br >> class=\"\"></div><div class=\"\"><div class=\"\">Newton's method power flow >> did not converge in 10 iterations.</div><div class=\"\">Gen 17 at upper Q >> limit, converting to PQ bus</div><div class=\"\">Gen 25 at upper Q limit, >> converting to PQ bus</div><div class=\"\">Gen 29 at upper Q limit, >> converting to PQ bus</div><div class=\"\">Gen 18 at lower Q limit, >> converting to PQ bus</div><div class=\"\">Index exceeds matrix >> dimensions.</div><div class=\"\"><br class=\"\"></div><div class=\"\"><font >> color=\"#ff0000\" class=\"\">Error in bustypes (line 43)</font></div><div >> class=\"\"><font color=\"#ff0000\" class=\"\"> >> ref = pv(1); " >> use the first PV bus</font></div><div class=""><font color="#ff0000" >> class=""><br class=""></font></div><div class=""><font color="#ff0000" >> class="">Error in runpf (line 291)</font></div><div class=""><font >> color="#ff0000" class=""> >> [ref, pv, pq] = bustypes(bus, gen);</font></div><div class=""><font >> color="#ff0000" class=""><br class=""></font></div><div class=""><font >> color="#ff0000" class="">Error in loopACPF_New_h2m (line >> 110)</font></div><div class=""><font color="#ff0000" class="">results = >> runpf(ps1, mpoption('pf.enforce_q_lims', 1));</font></div></div><div >> class=""><br class=""></div><div class="">and it jump out of the program. I >> expect even in case of not converting, it should not give any error as some >> times it gave this comment :</div><div class=""><br class=""></div><div >> class=""><div class="">Newton's method power flow converged in 8 >> iterations.</div><div class="">Gen 19 at lower Q limit, converting to PQ >> bus</div><div class="">Gen 28 at lower Q limit, converting to PQ >> bus</div><div class=""><br class=""></div><div class="">Newton's method >> power flow did not converge in 10 iterations.</div><div class="">Gen 25 at >> upper Q limit, converting to PQ bus</div><div class="">Gen 29 at upper Q >> limit, converting to PQ bus</div><div class="">Gen 18 at lower Q limit, >> converting to PQ bus</div><div class=""><br class=""></div><div >> class="">Newton's method power flow did not converge in 10 >> iterations.</div><div class="">All 1 remaining gens exceed their Q limits : >> INFEASIBLE PROBLEM</div><div class=""><br class=""></div><div >> class="">>>>>> Did NOT converge (0.24 seconds) >> <<<<<</div></div><div class=""><br >> class=""></div><div class="">which is fine, because it let the rest of the >> code continues to run.</div><div class=""><br class=""></div><div >> class="">So I am wondering if any one has any idea why the first case >> happens and how I can prevent its happening .</div><div class=""><br >> class=""></div><div class="">Thanks,</div><div class=""><br >> class=""></div><div class="">Mahraz</div></div> >> </div></blockquote></div><br class=""></div></div></body></html> > > >
