Low-pressure loop closing operation device and method

The invention provides a low-voltage closed-loop operation device and method.The low-voltage closed-loop operation device is characterized in that a rectification and inversion component is arranged between two low-voltage three-phase loops, the rectification and inversion component comprises two power transfer loops, and the on-off states of the two transfer loops in the closed-loop operation state are mutually exclusive; and determining a tidal current direction according to the state quantities of the two low-voltage loops and controlling a corresponding power transfer loop in the rectification and inversion component to be switched on, so that power between the two low-voltage three-phase loops is transferred according to the tidal current direction, and closed-loop operation is realized. The closed-loop operation of the low-voltage distribution network is realized through the rectification and inversion component, a material basis is provided for economic operation of the low-voltage distribution network