Can you send me the case off-list and I’ll have a look. You shouldn’t have to
change any options (including the OPF_FLOW_LIM option) in order for these flow
limits to be enforced.
Ray
--
Ray Zimmerman
Senior Research Associate
B30 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Mar 28, 2014, at 5:22 PM, Jiaying SHI <[email protected]> wrote:
> Hello Professor,
>
> I am using MATPOWER to solve DCOPF of a modified IEEE 118 case. I have set
> the upper bounds of the branch flow. The results indicate that the DCOPF
> converges but the some of the branch flow constraints are violated.
>
> I have set 'OPF_FLOW_LIM',1 in the mpcoption. And the output is:
>
> Optimization terminated.
> Converged in 0.12 seconds
> Objective Function Value = 125071.89 $/hr
> ================================================================================
> | System Summary
> |
> ================================================================================
> ......
> ================================================================================
> | Branch Flow Constraints
> |
> ================================================================================
> Brnch From "From" End Limit "To" End To
> # Bus Pf mu Pf |Pmax| Pt Pt mu Bus
> ----- ----- ------- -------- -------- -------- ------- -----
> 7 8 - -448.26 400.00 448.26 0.000 9
> 38 26 0.000 224.69 200.00 -224.69 - 30
> 96 38 - -192.40 160.00 192.40 0.000 65
> 116 69 0.000 111.88 100.00 -111.88 - 75
> 138 89 0.000 111.81 100.00 -111.81 - 90
> 140 89 0.000 203.48 200.00 -203.48 - 92
>
> Would you please tell me if other settings are required to ensure the branch
> flow limit?
>
> Thanks
> --
> Jiaying Shi
>
>
