With the maturity and development of the distributed generation technology

it becomes more and more crucial that micro grid should smoothly cooperate with the power grid. Consequently

by adding phase feed forward compensation on the basis of the advanced droop control

we put forward a new phase regulation method by using the modified algorithm based on linear gradually approaching. A running controller is designed to realize the synchronization before the transferring from the island mode to the grid-connected mode. The results reveal that

under the advanced control strategy

the frequency overshoot is reduced by about 38%

the frequency modified time is reduced by 30%

the error of phases is about zero

and the frequency error can be controlled within 0.01 Hz

which ensure the smooth and stable operation of the microgrid.