Micro-grid connection device

The invention discloses a micro-grid connection device. The device comprises a controllable switch, a signal acquisition circuit and a controller, wherein the controllable switch is electrically connected between a micro-grid and a large power grid and is used for connecting or disconnecting the micro-grid and the large power grid according to an on-off signal, the signal acquisition circuit is used for colleting electric signals of the micro-grid, the large power grid and the controllable switch, the controller is electrically connected between the signal acquisition circuit and the controllable switch, is used for generating the on-off signal according to the electric signals of the micro-grid, the large power grid and the controllable switch, and can control on and off of the controllable switch so as to realize connection and disconnection of the micro-grids. The micro-grid connection device has a simple structure, is convenient to wire, can efficiently, reliably and rapidly switch between connection and disconnection of the micro-grids, and can effectively guarantee the safety of maintenance workers and the security of electric equipment of the micro-grid and the large power grid.