Thanks a lot! *Fanjun Meng*
On Tue, Jun 28, 2011 at 12:36 PM, Santiago Torres <[email protected]>wrote: > Maybe the generation costs you are using for the opf are causing problems. > Try to check that!. > > Regards, > > Santiago > > 2011/6/28 Fanjun Meng <[email protected]> > >> 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 >>> >> >> > > > -- > 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 >
