def add_station(self, mv_station, force=False):
        """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)
        """
        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.')