Warning
To run an AC power flow with DC power flow initialization, use the AC power flow with init="dc".
pandapower uses PYPOWER to solve the DC power flow problem:
pandapower.rundcpp
Note
If you are interested in the pypower casefile that pandapower is using for power flow, you can find it in net["_ppc"]. However all necessary informations are written into the pandpower format net, so the pandapower user should not usually have to deal with pypower.