Aimed at the problem that the current deterioration and power fluctuation of the gird-connected point exist under the three-phase unbalanced grid, the output performance of the micro-sources is analyzed, and a grid-connected control strategy with voltage loop resonant controller applied to PQ control is proposed. The simulation results show that the improved PQ grid-connected control strategy can realize the unbalanced governance of the microgrid well, and also has a certain inhibitory effect on the fluctuation of microgrid output power.