Islands should not be a problem as long as there is a REF bus in the island and the available generation is sufficient to meet the load in each island. So (1) is a definite possibility, but (2) shouldn't be an issue. Insufficient reactive power range to keep voltage magnitudes within range, and overly restrictive branch flow limits could be other causes of an infeasible OPF problem. Aside from things that can cause the problem to actually be infeasible, there are also numerical issues that can affect feasible problems. These can be the result of large ranges in parameters (branch impedances, generator costs, etc.). In these cases, often a different solver or algorithm may be able to solve the problem successfully.
Hope this helps, -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On May 20, 2013, at 1:21 PM, Santiago Torres <[email protected]> wrote: > > Dear Ray, I my resarch work I am using many transmission topologies and also > I am using ficticious generators in order to get optimal power convergence > for those different transmission topologies. Using those artificial or > ficticious generators in all exclusive load buses is suposed to help for > convergence, however in practice I am getting some transmission > configurations that do not achieve convergence. > > I am thinking in the following reasons: > > 1) Too strict power generation limits of ficticious generators. > > 2) Some topologies with islanded nodes. > > Can you think in other reasons? > > Islanded nodes is a non convergence cause in Matpower? > > Best Regards, > > Santiago > > -- > Dr.-Ing. Santiago Torres > IEEE Senior Member > > Post-Doctoral Fellow > School of Electrical and Computer Engineering > > > University of Campinas, Campinas, SP, Brazil > > http://www.dsee.fee.unicamp.br/ > > Albert Einstein, 400 > 13083-852, Campinas, SP, Brazil
