Running a short-circuit calculation with a dc line

[dfurquim]

I'm attempting to run a short-circuit calculation in a network containing a dc line. However, when running pandapower.shortcircuit.calc_sc there is an error where a nan value is detected in the Ybus matrix.

I suppose the problem is that pandapower models the dc line as two decoupled generators but there aren't any inputs regarding the short-circuit calculation (vn_kv, xdss_pu, rdss_ohm, cos_phi). This two generators are created within the function pandapower.auxiliary._add_dcline_gens without assigning any values to the short-circuit parameters. Thus, they are created with nan as the default value.

Although these generators may be sufficient to model the behavior of the dc line in a power flow study, perhaps they are not well suited to model the behavior of the dc line converters in a short-circuit study.

I would like to propose the following fixes:

1) To use the static generator element instead of the voltage controlled generator element for modeling the two decoupled generators 2) The pandapower.create_dcline should have an input argument for the ratio of nominal current to short circuit current (inverters typically have control system that limits the injection of ac current during a fault).

PS: I'm using pandapower 2.7.0.

[rbolgaryn]

Dear @dfurquim ,

sounds good! Maybe it would also be a good idea to have an option to specify the type of generators, gen or sgen. Please feel free to open a pull request!

Best regards, Roman

[dfurquim]

Dear @rbolgaryn ,

Thanks for your reply. I'll try to contribute with a pull request when I have time. I just need to get more familiar with the code. If anyone is already on it, I'll be happy to give any support you may need.

Kind regards, Derick