Thank you very much for your suggestion! Actually I did check the simple power flow result with constraints, the voltages, line flows, generations are all satisfied. That's why I'm confused with this problem. Is it possible that the line impedences and system topology may cause matrix sigularity during OPF calculation iteration and fail to converge?
Thanks a lot! *Fanjun Meng * On Tue, Jun 28, 2011 at 10:13 AM, Santiago Torres <[email protected]>wrote: > The simple power flow has not constraints, so maybe with the settings you > are using the power flow converges and has solution, however when you use > the opf, some constraints can cause it does not converge. Check if the IEEE > 123 node reported solution when using the simple power flow is complying the > constraints (ie voltages, power generation, power flows). > > I hope this can help. > > Santiago Torres > > 2011/6/28 Fanjun Meng <[email protected]> > >> Hello, >> >> I've been working on IEEE 123 nodes system and created a model for >> MatPower power flow. This model is basically a radial distribution system >> with a single generation at substation and works fine when I can use >> runpf(), and it returns similar result as shown IEEE 123 node system report. >> However, when I use the same model for runopf(), it shows >> >> >> Numerically Failed >> Did not converge in 4 iterations. >> Did not converge (0.10 seconds) >> >> The total generation is very different from total demand, and bus voltages >> are at strange values (e.g. 1.836p.u. at reference bus). Also, generation >> cost Lambda are extremely high (e.g. 17528752586.76 $/MWh @ bus 6). I have >> tried to add multiple DGs at different locations and change the system to a >> ring type system, but it didn't work out. Does anyone have any suggestions >> or experiences to this problem? Your help is highly appreciated! >> >> Have a good day!* >> >> Fanjun Meng >> * >> >> > > > -- > 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 >
