Bus voltage holding device based on artificial zero crossing

The utility model discloses a bus voltage holding device based on artificial zero passage, which relates to the field of neutral ungrounded power systems and comprises a three-phase protection switch, a three-phase quick switch, an artificial zero passage module, a current limiting reactor and a controller. The output end of the three-phase protection switch is connected with the input end of the three-phase high-speed switch, the output end of the three-phase high-speed switch is connected with the second system bus, and the output end of the controller is connected with the input end of the three-phase high-speed switch; by means of the three-phase fast switch, manual zero-crossing arc extinguishing is forced before natural zero-crossing arc extinguishing of each phase of power frequency short-circuit current, A-phase and C-phase fast on-off of the three-phase fast switch is achieved within 3 ms, and therefore A-phase and C-phase current-limiting reactors are input, short-circuit current is limited, and sta