I am a beginner in matlab and Matpower. I have a load bus in system that has two branches. When I deleted these two branch power flow is not converged. How can I solve this problem? When I changed the type of bus to 4, it converged but the branches also connected to the bus. Is there are any option for that in matpower? Thank you.
You should isolate the bus first by deleting the two branches and then use matpower's ext2int.
From the manual:
ext2int first removes all isolated buses, off-line generators and branches, and any generators or branches connected to isolated buses. Then the buses are renumbered consecutively, beginning at 1