Single-phase voltage drop in the grid will cause the unbalanced output current and the large impulse current of doubly-fed induction generator (DFIG). The traditional virtual synchronous generator (VSG) control strategy is modeled on the basis of ideal voltage, which cannot cope with the coupling of negative and positive sequence component of voltage. It will directly affect the stability of current loop and pulse width modulation signal output. Aiming at this problem, a virtual synchronous control strategy based on single-phase Park transformation in decoupled dual synchronous coordinate system (DDSRF-VSG-Spark) is proposed. Firstly, the positive and negative sequence component are decoupled by decoupling the double synchronous reference frame. Then the single-phase Park transformation technology is used to realize the stable output of pulse width modulation signal and current. Finally, through simulation comparison, it is verified that DDSRF-VSG-Spark can ensure the stable operation of the system during single-phase grid voltage drop.