Are the nodal voltage limits set wide enough(e.g. 0.9 an 1.1)?
Another possible source could be a bad choice of baseMVA and base voltage.
Do you convert the impedances by yourself or are they already given in p.u?
Regards,
Simon
Am 6/28/2011 10:05 PM, schrieb Fanjun Meng:
Thanks a lot!
/Fanjun Meng/
On Tue, Jun 28, 2011 at 12:36 PM, Santiago Torres
<[email protected] <mailto:[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] <mailto:[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] <mailto:[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] <mailto:[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
