Microgrid structure based on back-to-back AC/DC converter

The utility model relates to a microgrid structure based on a back-to-back AC/DC converter. By adopting a grid-connected protection terminal, the abnormal protection of the grid-connected points can be realized, the grid-connected point switch can be controlled, and the grid-connected/off-grid switching instructions can be provided. By adopting a source-load balanced control terminal, the total balance of the power output of a distribution-type power generating unit, energy storage system power, power output of a backup power supply, and active power of a load can be realized during the grid-connected/off-grid operation of the microgrid. The microgrid structure is advantageous in that the back-to-back AC/DC converter is adopted, when the outer part of the microgrid is abnormal, the grid-connected/off-grid smooth switching can be realized, and the power interruption can be prevented; under the condition of losing the power supply of the power distribution network, the microgrid can be smoothly switched to the off-grid operation, and then the power supply reliability of the load of the microgrid can be effectively guaranteed.