def parallel_branch(grid, node_target):
    """ Reinforce MV or LV grid by installing a new parallel branch according to dena

    Parameters
    ----------
        grid : :class:`~.ding0.core.GridDing0`
            Grid identifier.
        node_target: :obj:`int`
            node where the parallel cable (starting from HV/MV substation) is connected to (used when grid is a MV grid)

    Returns
    -------
    type 
        #TODO: Description of return. Change type in the previous line accordingly
    """
    pass
