Create networkx graph

The basis of all topology functions is the conversion of a padapower network into a NetworkX MultiGraph. A MultiGraph is a simplified representation of a network’s topology, reduced to nodes and edges. Busses are being represented by nodes (Note: only buses with in_service = 1 appear in the graph), edges represent physical connections between buses (typically lines or trafos). Multiple parallel edges between nodes are possible.

This is a very simple example of a pandapower network being converted to a MultiGraph. (Note: The MultiGraph’s shape is completely arbitrary since MultiGraphs have no inherent shape unless geodata is provided.)

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Nodes have the same indicees as the buses they originate from. Edges are defined by the nodes they connect. Additionally nodes and edges can hold key/value attribute pairs.

The following attributes get transferred into the MultiGraph:

lines trafos
  • from_bus
  • to_bus
  • length_km
  • index
  • in_service
  • max_i_ka
  • hv_bus
  • lv_bus
  • index
  • in_service

Apart from these there are no element attributes contained in the MultiGraph!

Creating a multigraph from a pandapower network

The function create_nxgraph function from the pandapower.topology package allows you to convert a pandapower network into a MultiGraph:

pandapower.topology.create_nxgraph(net, respect_switches=True, include_lines=True, include_trafos=True, nogobuses=None, notravbuses=None, multi=True)

Converts a pandapower network into a NetworkX graph, which is a is a simplified representation of a network’s topology, reduced to nodes and edges. Busses are being represented by nodes (Note: only buses with in_service = 1 appear in the graph), edges represent physical connections between buses (typically lines or trafos).

INPUT:
net (pandapowerNet) - variable that contains a pandapower network
OPTIONAL:
respect_switches (boolean, True) - True: open line switches are being considered
(no edge between nodes)

False: open line switches are being ignored

include_lines (boolean, True) - determines, whether lines get converted to edges

include_trafos (boolean, True) - determines, whether trafos get converted to edges

nogobuses (integer/list, None) - nogobuses are not being considered in the graph

notravbuses (integer/list, None) - lines connected to these buses are not being
considered in the graph
multi (boolean, True) - True: The function generates a NetworkX MultiGraph, which allows
multiple parallel edges between nodes False: NetworkX Graph (no multiple parallel edges)
OUTPUT:
mg - Returns the required NetworkX graph
EXAMPLE:

import pandapower.topology as top

mg = top.create_nx_graph(net, respect_switches = False) # converts the pandapower network “net” to a MultiGraph. Open switches will be ignored.

Examples

create_nxgraph(net, respect_switches = False)
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create_nxgraph(net, include_lines = False)
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create_nxgraph(net, include_trafos = False)
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create_nxgraph(net, nogobuses = [4])
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create_nxgraph(net, notravbuses = [4])
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