code: def generate_dummy_graph(network):
      
      
      graph = pypsa.descriptors.OrderedGraph()
      
      graph.add_nodes_from([bus for bus in network.buses.index if bus not in buses_to_split])
      
      #add positions to graph for voronoi cell computation
      for node in graph.nodes():
          graph.node[node]["pos"] = np.array(network.buses.loc[node,["x","y"]],dtype=float)
      
      return graph
docs: Generate a dummy graph to feed to the FIAS libraries.
      It adds the "pos" attribute and removes the 380 kV duplicate
      buses when the buses have been split, so that all load and generation
      is attached to the 220kV bus.