According to the masterslave structure of microgrids control strategy, three micro source low voltage microgrids simulation model is built using the general large electromagnetic transient simulation software PSCAD / EMTDC, in grid connected operation, using PQ control, micro source maximum power output; in the islanding operation, the main control of micro sources using V / F control, for the stable operation of microgrids provides voltage and frequency support. Masterslave structure of microgrids system respectively in the operation of grid connected and islanded operation dynamic characteristics are analyzed by electromagnetic transient simulation software PSCAD / EMTDC. The simulation results verify the effectiveness and feasibility of the proposed control strategy. To lay the foundation for further research on the control strategy of the master slave structure.