In the case of the DC OPF, the Kuhn-Tucker multiplier at the "from" and "to"
sides are simply distinguished by the direction of the flow. If the flow is
binding in the from->to direction, it will be the MU_SF that is non-zero. If it
binds in the to->from direction it will be MU_ST that is non-zero. Only one
should be non-zero at time for a given branch.
So, if you don't care about direction, the multipliers for transmission
capacity constraints and power balance constraints can be found as follows:
define_constants;
r = rundcopf('mycase');
mu = r.branch(:, MU_SF) + r.branch(:, MU_ST);
lambda = r.bus(:, LAM_P);
--
Ray Zimmerman
Senior Research Associate
419A Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Mar 14, 2013, at 9:53 PM, 胡源 <[email protected]> wrote:
> Thank you for providing this platform for us to discuss our problem when
> using matpower!
> when I use the command 'rusults=rundcopf()', the value of
> rusults.branch(:,18) is not the same to the rusults.branch(:,19), because it
> is the dc power flow, I think there is no difference between the Kuhn-Tuchker
> multiplier on MVA limit at 'from' bus and 'to' bus. Can you explain it to me
> or tell me how to get the Lagrange multipliers for transmission line capacity
> constraints and equality constraints after rundcopf. Thank you!
>
>
>
> sincerely yours
>
>
>
> hu yuan
