Pandapower converter

The 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.

Cross referencing

Due to differences between the power-grid-model and pandapower, some components in one model are modeled as multiple components in the other or vise versa. An example on how to cross-reference can be found in the pandapower conversion example.

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.

Modeling 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, i.e., generator, DC line are unsupported as of now.

In addition, the following component-specific modeling differences exist.

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 modeled 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 vk0_percent and vkr0_percent in transformers are not supported. The same ones as positive sequence admittance is used in power-grid-model. However, mag0_percent and mag0_rx are fetched from pandapower. In case vk0_percent is different from vk_percent all zero sequence parameters are ignored.

For pandapower<3.4.0 if installed, mag0_percent is treated as a ratio not as a percent in line with definition of pandapower<3.4.0. While for pandapower>=3.4.0 or where pandapower is not installed, mag0_percent is treated as a percent.

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

Custom zero sequence parameters in three winding transformers are not supported. The differences defined in Transformer are applicable here as well. Additionally, tap connection at star point, i.e., tap_at_star_point is not supported.