Hi Prem, If you are solving each island individually, the DC OPF should converge as long as (1) you have a reference bus in the island, (2) there is adequate generation to cover the load in the island, and (3) the line constraints do not prevent the generated power from reaching the loads.
Ray > On Jun 23, 2017, at 9:18 AM, prem panigrahi <prempanigr...@outlook.com> wrote: > > > Dear All > I am facing convergence problem during the calculation of DCOPF in > IEEE buses. For my work I have fixed the capacity of transmission line 110% > of initial power flow by changing the RATE_A field, then at each time, I > increase the load and generation with a factor (1+alpha). I remove the lines > whose power flow is more than their capacity. After the certain load, the > grid divided into many parts. I tried to solve the island problem but dcopf > not converged. I found on one island the dispatchable load is less than its > generation. Should I take this situation as a blackout??. Please help me > > > > > > > > > Prem Panigrahi > Research Scholar > India > > > > From: prem panigrahi <prempanigr...@outlook.com> > Sent: Tuesday, June 20, 2017 6:13:37 PM > To: matpowe...@list.cornell.edu > Subject: DCOPF not converge > > Hello Sir > > In IEEE 57 bus, I fixed the capacity of transmission line and then increase > the load and generation. I removed those lines whose power flow is more than > their capacities. When the grid is divided into 4 parts. I remove the > isolated buses. In island 1------- 45 buses are there including 7 > generators. Matpower automatically considers the slack bus. But the DCOPF > doesn't converge as the generation has a capacity of 1975.9 MW, but it > dispatches only 928.9 MW. So there is a mismatch in load and generation. Load > requirement is 1321.9 MW. Is there any mistake that I am doing? . > <result.txt>
