The problem may be due to the flaws in the modified case. There's a possibility that in order to converge and in order to acquire a feasible state, this condition arises in OPF
Aman On Saturday, 29 March 2014 2:53 AM, 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
