* * *Dear Arash,Dear all, *
* * *I-I read the power flow from line 1 to 2 and from line 1 to 3.After making all the loads double, we have 154.81 and 81.74 MW for them respectively (Baring in mind that they were 10.89 and 15.08 MW). Does that make sense?* * * *II-I changed rate A or B or C from 133 to 60 but again got the same power flow on branches 1-2 and 1-3.* * * *III-If I am not able to do it by changing certain values, does anyone has a reference to introduce to me in which I can calculate Line Thermal Limits from x, r ,w ?* * * *Thank you for your help * On Wed, Jan 11, 2012 at 7:34 PM, Arash Alimardani <[email protected] > wrote: > I guess the thermal limit constraint is satisfied in your case (236.55 MW). > Firstly, you have to read the power flow through the line, not the > injected power in one bus. > Secondly, as I remember, the column rateA in the branch matrix for each > case is the thermal limit of that line. > In your case, the slack is connected to bus 2 and bus 3, which provides it > with 260 MW capacity of transmitting power. > > Regards > > > On Wed, Jan 11, 2012 at 8:57 AM, iman <[email protected]> wrote: > >> Dear all, >> >> >> I want to use power flow (PF) for the load increase studies. I picked 30 >> bus system with Pg=23.54 MW for the slack bus. Running the power flow with >> the base loads ,I get 25.97 MW which is quite close to 23.54. >> >> Now I want to increase all of the loads 2 times. Running pf I get 236.55 >> MW for the slack bus . >> >> I think in practice thermal line limits doesn’t allow this amount of >> power dragging from slack bus. >> >> I want to make my problem practical by imposing thermal limits on the >> branches .How can I do that? >> >> >> Thank you in advance for your patience >> >> I look forward to hear from you guys >> >> Iman >> > > -- Best regards Iman
