The microgrid inverter is generally controlled by droop controller or virtual synchronous generator

and the methods and characteristics of low voltage ride-through(LVRT)are different from inverters with PQ controller. The main problem of the LVRT strategy of the microgrid inverter is phase shift between the inverter voltage and the grid voltage during the fault

which would greatly affect the recovery speed of the grid-connected current. To solve the problems above

a strategy for memory retention of variables such as power angle during faults is proposed so that the variables before and after the fault are basically consistent to achieve rapid recovery of the system after the fault. The positive and negative sequence currents are separately controlled in the double synchronous rotating coordinate system and the forward feeding of the grid voltage is introduced to eliminate the negative sequence component during faults. Both the simulation and the experiment verify the correctness and effectiveness of the control strategy.