Dear all,
I am a new user of Matpower and I'm trying to perform a power flow calculation on a simple MV passive network, characterized by a primary substation (with its own 150/20 transformer), 6 nodes and 5 branches. If I do not consider the transformer, as you can see in the following lines, the PF converges. mpc.baseMVA 100 mpc.bus[ 1 3 0 0 0 0 1 1 0 20 1 1,05 0,95 2 1 0,4847 0,235 0 0 1 1 0 20 1 1,05 0,95 3 1 0,130 0,063 0 0 1 1 0 20 1 1,05 0,95 4 1 0,0505 0,0245 0 0 1 1 0 20 1 1,05 0,95 5 1 0,0315 0,0155 0 0 1 1 0 20 1 1,05 0,95 6 1 0,0505 0,0245 0 0 1 1 0 20 1 1,05 0,95 ] mpc.branch[ 1 4 0,253 0,2762 2,0e-06 0 0 0 0 0 1 -360 360 4 6 0,134 0,1469 1,0e-06 0 0 0 0 0 1 -360 360 6 5 1,183 1,2893 9,4e-06 0 0 0 0 0 1 -360 360 5 2 0,264 0,2882 2,1e-06 0 0 0 0 0 1 -360 360 2 3 0,098 0,0735 5,3e-07 0 0 0 0 0 1 -360 360 ] mpc.gen[ 1 0 0 0 0 1 100 1 25 0 0 0 0 0 0 0 0 0 0 0 0 ] On the contrary, if I consider the transformer, the PF does not converge. mpc.bus[ 1 3 0 0 0 0 1 1 0 150 1 1,05 0,95 7 1 0 0 0 0 1 1 0 20 1 1,05 0,95 2 1 0,4847 0,235 0 0 1 1 0 20 1 1,05 0,95 3 1 0,130 0,063 0 0 1 1 0 20 1 1,05 0,95 4 1 0,0505 0,0245 0 0 1 1 0 20 1 1,05 0,95 5 1 0,0315 0,0155 0 0 1 1 0 20 1 1,05 0,95 6 1 0,0505 0,0245 0 0 1 1 0 20 1 1,05 0,95 ] mpc.branch[ 1 7 0,018 0,4800 0 0 0 0 7.5 0 1 -360 360 7 4 0,253 0,2762 2,0e-06 0 0 0 0 0 1 -360 360 4 6 0,134 0,1469 1,0e-06 0 0 0 0 0 1 -360 360 6 5 1,183 1,2893 9,4e-06 0 0 0 0 0 1 -360 360 5 2 0,264 0,2882 2,1e-06 0 0 0 0 0 1 -360 360 2 3 0,098 0,0735 5,3e-07 0 0 0 0 0 1 -360 360 ] mpc.gen[ 1 0 0 0 0 1 100 1 25 0 0 0 0 0 0 0 0 0 0 0 0 ] I think that the problem is the way I model the transformer or the nodes where it is connected. Thank you in advance for your help. Simona
