You are probably just seeing artifacts of the numerical optimization. With the inputs you mentioned I am not seeing any binding line flow constraints being printed. With some solvers, the values of the multipliers are zero, with others some take very small values on the order of 1e-5 or smaller. The code in printpf() actually applies a threshold of 1e-4 to help determine which constraints are binding.
So, I would consider any multiplier smaller than 1e-4 to be zero. -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Mar 16, 2013, at 6:36 AM, 胡源 <[email protected]> wrote: > Dear Prof.Zimmerman, > Thank you for your reply, my understanding to this quesion is the same as > your reply, but when I get the results of rundcopf('case24_ieee_rts') after > setting branch(21,6)=230; branch(30,6)=180(In order to simulate the > situation of reaching the bound of flow constrains.), it shows that most of > the MU_SF and MU_ST of the same branch is non-zero at the same time instead > of only one of them is non-zero. So can you explain this situation to me? > Thank you! > > > sincerely yours, > > > Hu Yuan
