Dear Shiyang, Li Thanks for taking time answering.
I didn’t increase any generations in the PV buses because my objective for increasing the load is pushing the system to the instability margin (like voltage drop in buses). I agree with you that network loss doesn’t seem a real number as well as other numbers. In the case30.m (base case) after running pf I have: *Total generation capacity =335 MW* *On-line capacity =335 MW* *Continued Gens (actual generation)=191.6 MW* *Load = 189.2 MW* *Losses=2.44 MW* * * *Branch 1-2 =10.89 MW* *Branch 1-3=15.08 MW* ****Now I multiply Pd (demanded power)by 2 to make the whole consumption twice, I have*** *Total generation capacity =815 MW* *On-line capacity =815 MW* *Continued Gens (actual generation)=402.2 MW* *Load = 378 MW* *Losses=23.82 MW* * * *Branch 1-2 =154.81 MW* *Branch 1-3=81.08 MW* * * * * Having said the above in brief: 1-In Bus 1 (Slack) we have 236.55 MW injection power .Where does this added amount come from? 2-What if I want to fix branch 1-2 limit to 100 MW (or 100 MVA)? What should I do? Thank you for your attention and time Wish you the best. Iman On Wed, Jan 11, 2012 at 7:45 PM, 李诗旸 <[email protected]> wrote: > Dear Iman,**** > > With the load increasing, have you increase the generation from PV buses? > I don’t think the network loss could usually increase to nearly 10 times > even at static limit. You may double the Pg on PV buses with the load. > Then, if you still want to impose the branch thermal limits, you have to > code the function to adjust the Pg for PV buses based on participant > factors (branch flow sensitivity w.r.t. generation) or others.**** > > ** ** > > Shiyang, Li**** > > ** ** > > ** ** > > *发件人:* [email protected] [mailto: > [email protected]] *代表 *iman > *发送时间:* 2012年1月12日 0:57 > *收件人:* [email protected] > *主题:* limits on the branches**** > > ** ** > > 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
