def METHOD_NAME(net: pandapower.auxiliary.pandapowerNet, voltage_levels: List[int] = None):
    """
    Add lines with low impedance and a slack to the boundary nodes with highest voltage.
    :param net: The pandapower network
    :param voltage_levels: The voltage levels to add lines and slacks. For each given voltage level, lines and one
    slack will be connected to the corresponding boundary nodes. Optional, default: Highest voltage level from
    boundary nodes.
    :return:
    """
    sc = cim_tools.get_pp_net_special_columns_dict()
    busses = net.bus.loc[(net.bus[sc['o_prf']] == 'eq_bd') | (net.bus[sc['o_prf']] == 'tp_bd')]
    if voltage_levels is None:
        max_voltage = busses['vn_kv'].max()
        logger.info("Highest voltage level: %skV" % max_voltage)
        voltage_levels = [max_voltage]
    pp.create_std_type(net, data=dict({'r_ohm_per_km': 0, 'x_ohm_per_km': .05, 'c_nf_per_km': 0, 'max_i_ka': 9999}),
                       name='low_impedance_line', element='line')
    for one_voltage_level in voltage_levels:
        logger.info("Processing voltage level %skV" % one_voltage_level)
        busses_t = busses.loc[busses['vn_kv'] == one_voltage_level]
        new_bus_id = pp.create_bus(net, vn_kv=one_voltage_level,
                                   name='virtual slack bus at voltage level ' + str(one_voltage_level))
        logger.info("Added virtual slack bus with ID: %s" % new_bus_id)
        pp.create_ext_grid(net, bus=new_bus_id, vm_pu=1.0,
                           name='virtual slack at voltage level ' + str(one_voltage_level))
        logger.info("Added slack at bus ID: %s" % new_bus_id)
        new_bus_id_array = [new_bus_id for _ in busses_t.index.values]
        pp.create_lines(net, from_buses=busses_t.index.values, to_buses=new_bus_id_array, std_type='low_impedance_line',
                        name='virtual line to slack node with voltage level ' + str(one_voltage_level), length_km=1)
        logger.info("Created %s low impedance lines." % len(busses_t.index.values))
        del busses_t