I'd suggest you specify 2 of them as PV node and then play around setting different values of P to reach the desired angles at those two nodes. This way you can basically define several U-delta nodes. Load Flow algorithms in general don't do more than one U-delta bus as far as I know.
regards, Gorazd ________________________________ Od: [email protected] [[email protected]] v imenu Andrey Vieira [[email protected]] Poslano: 31. maj 2017 15:27 Za: MATPOWER discussion forum Zadeva: Re: How to indicate in MATPOWER the use of several substations in the cases of radial distribution systems? Mr. Ray, that's exactly it. I will try to exemplify the question again using the 16 buses radial system. In this system, there are 3 bars (3 substations) that provide the power for the entire electrical network. This system consists of three feeders. With this, there is one substation for each feeder. [cid:75f08e88-f6da-460a-8a51-83b014a765ec] My question is can I consider all the substation bars (1,2 and 3) as generation bars (PV)? For this consideration, the radial system will be considered as a meshed system. See example below. With this, the radial distribution system of 16 buses will be considered as a meshed system. With this, the results will be affected? %% bus data % bus type Pd Qd Gs Bs area Vm Va baseKV zone Vmax Vmin mpc.bus = [ 1 3 0.0 0.0 0 0 1 1.00 0 11 1 1.05 0.950; 2 3 0.0 0.0 0 0 1 1.00 0 11 1 1.05 0.950; 3 3 0.0 0.0 0 0 1 1.00 0 11 1 1.05 0.950; 4 1 2.0 1.6 0 0 1 1.00 0 11 1 1.05 0.950; 5 1 3.0 1.5 0 1.1 1 1.00 0 11 1 1.05 0.950; 6 1 2.0 0.8 0 1.2 1 1.00 0 11 1 1.05 0.950; 7 1 1.5 0.2 0 0 1 1.00 0 11 1 1.05 0.950; 8 1 4.0 2.7 0 0 1 1.00 0 11 1 1.05 0.950; 9 1 5.0 3.0 0 1.2 1 1.00 0 11 1 1.05 0.950; 10 1 1.0 0.9 0 0 1 1.00 0 11 1 1.05 0.950; 11 1 0.6 0.1 0 0.6 1 1.00 0 11 1 1.05 0.950; 12 1 4.5 2.0 0 3.7 1 1.00 0 11 1 1.05 0.950; 13 1 1.0 0.9 0 0 1 1.00 0 11 1 1.05 0.950; 14 1 1.0 0.7 0 1.8 1 1.00 0 11 1 1.05 0.950; 15 1 1.0 0.9 0 0 1 1.00 0 11 1 1.05 0.950; 16 1 2.1 1.0 0 1.8 1 1.00 0 11 1 1.05 0.950; ]; Or should I always consider a reference bar (for example, bar 1) and the other two as generation bar (bars 2 and 3)? ________________________________ De: [email protected] <[email protected]> em nome de Ray Zimmerman <[email protected]> Enviado: terça-feira, 30 de maio de 2017 20:17 Para: MATPOWER discussion forum Assunto: Re: How to indicate in MATPOWER the use of several substations in the cases of radial distribution systems? I’m not sure I understand what you mean by a radial system with more than one substation. You definitely don’t want to set multiple buses of type REF, though you could use type PV for all but one of the substations, but that is equivalent to turning a radial system into a meshed system. Ray On May 26, 2017, at 10:27 AM, Andrey Vieira <[email protected]<mailto:[email protected]>> wrote: Hi All! I have a question about the use of several substation bars in the case of radial distribution systems with more than one substation. Examples: A) Case 16 buses : it has 3 substations; B) Case 135 buses: it has 2 substations; C) Case 84 buses : it has 11 substations. In the case of 84 buses, for example, can I identify all substation buses with different numberings and indicate that all 11 buses are of type 3 in the mpc.bus matrix? Instead of numbering all 11 with the same number (1 for exemplo)? Can anybody advice on representation these sources in MATPOWER? Andrey R Vieira
