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Add compute_switch_flows() for zero-impedance bus-bus switches #2956

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Add compute_switch_flows() for zero-impedance bus-bus switches #2956

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1 change: 1 addition & 0 deletions CHANGELOG.rst
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Expand Up @@ -3,6 +3,7 @@ Change Log

[upcoming release] - 2026-..-..
-------------------------------
- [ADDED] toolbox: :code:`compute_switch_flows` computes power flow through zero-impedance bus-bus switches via nodal balance
- [FIXED] runopp(init="results") now preserves the warm-start vector in the PIPS-backed AC OPF solver
- [ADDED] added more functions to diagnostic
- [ADDED] check to check if vkr_percent values are reasonable (see issue #786).
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9 changes: 8 additions & 1 deletion doc/elements/switch.rst
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@@ -1,4 +1,4 @@
.. _switch_model:
.. _switch_model:

=============
Switch
Expand Down Expand Up @@ -41,6 +41,13 @@ This has the following advantages compared to modelling the switch as a small im
- there is no voltage drop over the switch (ideal switch)
- no convergence problems due to small impedances / large admittances
- less buses in the admittance matrix

.. note::

Because fused buses share one internal node, ``res_switch`` contains NaN for
bus-bus switches with ``z_ohm=0`` after ``runpp()``. To compute the power
flow through these switches via nodal balance, call
:func:`pandapower.toolbox.compute_switch_flows` after the load flow.

*Bus-Element-Switches:*

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2 changes: 2 additions & 0 deletions doc/toolbox.rst
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Expand Up @@ -47,6 +47,8 @@ Result Information

.. autofunction:: pandapower.toolbox.clear_result_tables

.. autofunction:: pandapower.toolbox.compute_switch_flows

.. autofunction:: pandapower.toolbox.res_power_columns

====================================
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