Dear Professor Zimmerman, Thank you for your time. Please confirm if my understanding is correct. For this duplicate branch 77 80 0.017 0.0485 0.0472 0 0 0 0 0 1 -360 360; 77 80 0.0294 0.105 0.0228 0 0 0 0 0 1 -360 360;
1/r_t =1/ 0.017 +1/ 0.0294 ---> r_t=0.0108 *OR* r_t = (0.017 + 0.0294)/2 ---> r_t=0.0232 1/x_t =1/ 0.0485 +1/ 0.105 ---> x_t=0.0332 *OR* x_t =(0.0485 + 0.105)/2 ---> x_t=0.07675 b_t= (0.0472 + 0.0228)*2 ---> b_t=0.14 so the equivalent branch is 77 80 0.0108 0.0332 0.14 0 0 0 0 0 1 -360 360;360; *OR* 77 80 0.0232 0.07675 0.14 0 0 0 0 0 1 -360 360;360; Kind Regards, Naime On Tue, Apr 20, 2021 at 1:09 AM Ray Daniel Zimmerman <r...@cornell.edu> wrote: > In general, the line ratings RATE_A, etc, would also equal the sum of the > individual line ratings, but in this case the capacity limit is not given > (interpreted as unlimited) so no change. > > However, a quick correction … while the total impedance (*r* and *x*) are > halved, the total line charging (*b*) is doubled. > > Ray > > > On Apr 19, 2021, at 9:59 AM, naime ahmadi <naimeahm...@gmail.com> wrote: > > Hello Matpower users, > > I want to remove duplicate branches in IEEE 118 bus system and put an > equivalent one. For example: > fbus tbus r x b rateA rateB rateC ratio angle status angmin angmax > > duplicate branches: > 42 49 0.0715 0.323 0.086 0 0 0 0 0 1 -360 360; > 42 49 0.0715 0.323 0.086 0 0 0 0 0 1 -360 360; > > equivalent branch: > 42 49 0.0357 0.1615 0.0430 0 0 0 0 0 1 -360 360; > > Is it sufficient to only change r, x and b to equivalent one or do I need > to have more changes? > > Thanks, > Naime > > >
