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 >
