Considering the micro source and load with different types and its dispersion， the low voltage microgrid can be controlled comprehensively by different control strategies based on the two typical microgrid operating modes. Given that the line parameters of a low voltage grid is resistive， the traditional droop characteristic feature is redesigned under islanding mode of the microgrid system. Meanwhile， a grid synchronization controller is proposed to effectively reduce the impact on low voltage grid systems by reconnecting the micro source to the grid. The controller can also improve the stability and reliability of the system. Through three detailed case studies， being（i） switching microgrid operation modes，（ii）cutting or increasing load in islanding mode， and（iii） cutting and reconnecting one micro source in islanding mode， the feasibility of the proposed control strategy for the low voltage system is validated.