Pandapower converter

Pandapower converter can convert the pandapower net to power-grid-model input data. It also converts the power flow output of power-grid-model into the res_* Dataframes in the pandapower net. The converter can be used in a similar way as described in Converters.

Defaults

If any of the essential tap attributes: tap_pos, tap_nom, tap_side are not available then the tap feature for transformers are disabled by setting tap_nom=tap_pos=0 via conversion. If a vector_group is not available for transformer then a default is set in conversion as YNyn for even clocks and DYn for odd clocks. Similarly for three winding transformer, YNynyn is set for even clocks of shift_mv_degree and shift_lv_degree. If the clocks are odd, then the vector group is converted as YNynd, YNdyn or YNdd.

Modelling differences

The user must be aware of following unsupported features or differences in conversion. Currently, the conversions only support powerflow calculations and their relevant attributes. Any feature involving a PV bus, ie. generator, DC line are unsupported as of now.

Load

Delta type of loads, type="delta" are not supported in power-grid-model.

Switch

The features regarding in_ka and z_ohm attributes are currently unsupported.

External grid

The external grid is modelled with a source impedance all sequence components in power-grid-model. Whereas it is only present in negative and zero sequence networks in pandapower. Hence, this impedance value has to be mentioned in the power-flow calculation when using the power-grid-model power flow calculation.

Transformer

Custom zero sequence parameters in transformers are not supported. The same ones as positive sequence admittance is used in power-grid-model. The changing of impedance by the means of characteristics in net.characteristic is not directly supported. The phase shift in angle by transforermers by the shift_degree attribute only supports clock values in PGM. The tap_phase_shifter transformer and shifting of angles with tap via tap_step_degree are features not added in power-grid-model yet. The default for transformer model to be used in pandapower is t model but power-grid-model supports only pi model of transformer hence this may create a minor difference calculation.

Three winding transformer

The differences defined in Transformer are applicable here as well. Additionally, tap connection at star point, ie. tap_at_star_point is not supported.