code: def add_station(self, mv_station, force=False):
          
          if not isinstance(mv_station, MVStationDing0):
              raise Exception('Given MV station is not a MVStationDing0 object.')
          if self._station is None:
              self._station = mv_station
              self.graph_add_node(mv_station)
          else:
              if force:
                  self._station = mv_station
              else:
                  raise Exception('MV Station already set, use argument `force=True` to override.')
docs: Adds MV station if not already existing
  
          Args
          ----
          mv_station: MVStationDing0
              Description #TODO
          force: bool
              If True, MV Station is set even though it's not empty (override)