If you haven’t tried it, certainly try increasing the number of iterations for the radial methods.
Ray > On Jul 3, 2017, at 3:15 PM, Andrey Vieira <andre...@hotmail.com> wrote: > > for Reconfiguration/Restoration process, ie: > > Occurrence of significant concentration of buses/Loads in a given healthy > region (region that will receive some or all of the disconnected Loads) > Of the feeder (as shown below) via the relocation of disconnected loads > (optimization process) due to the insulation of some faulty upstream faults > Of the off region. > > Exemplifying Illustration: > > I took the 33bw case as an example in three different load flow execution > scenarios to exemplify my issue. > SITUATION A: > The case 33wb is illustrated below for a specific type of topology. > For this configuration, there was convergence for the > 4 methods (Newton, PQSUM, ISUM and YSUM) evaluated. > > <pastedImage.png> > > > > > > Situation B: > Similarly, the case 33wb is illustrated below for another specific type > of topology. For this new configuration, similar to the previous one, > there was convergence for the 4 methods (Newton, PQSUM, ISUM > and YSUM) evaluated. > <pastedImage.png> > > > > > > > > > Situation C: > For this new configuration, the 33wb case, shown below, presents a > particular type of topology in which it has concentrated much load > on the central feeder. The consequence of this was the non-convergence > of all 4 methods (Newton, PQSUM, ISUM and YSUM) evaluated. > <pastedImage.png> > > Note: This analysis was also performed for other feeders (case 84, > case 85, case 135 and case70). It seems to me that in the act of network > switching (each switching sequence is a possible solution), by > concentrating Loads in a given region of the network, the possibility of > non-convergence is high, regardless of the method used. I would like to > know how to proceed with this problem. For the evolutionary algorithm > I use needs to evaluate this configuration, even Knowing that such a > solution is not feasible and possibly will be ruled out by the restriction > criteria of the optimization that I have adopted. What to do? Increase the > number of iterations? How to make convergence of power flow occur even for > those absurd configurations?
