The invention relates to a fault ride-through control device and method for alternating /
direct current mixed
microgrid, and belongs to the field of operational control of the alternating /
direct current mixed
microgrid. A power release unit, a
direct current voltage adjusting unit, a direct current power release unit and a central monitoring unit are added to an alternating / direct current mixed
microgrid system to form an
alternating current fault ride-through coordination control structure of the alternating / direct current mixed microgrid
system. By means of the fault ride-through control device and method for the alternating / direct current mixed microgrid, a controllable release access of excess power in a failure process is achieved, tide
mutation is prevented from impacting equipment in the grid,
voltage fluctuation of a low-
voltage direct current
bus is stabilized, lockout of alternating / direction current power exchanging equipment is avoided, the alternating / direction current power exchanging equipment is made to transmit power in the failure process, the
impact to a
power frequency conversion unit from failure current is reduced, tide distribution in the grid is controlled in an optimal mode, the excess power is controlled to be released,
overcurrent loss is reduced, normal work in the failure process is guaranteed, and
alternating current fault ride-through is achieved when alternating / direct current microgrids are connected. The fault ride-through control device is compact in structure, achieves fault ride-through with the minimum loss method, and has popularization significance.