In order to realize regional autonomous control and efficient power allocation of microgrid, an improved autonomous operation control strategy is proposed. The power transmission characteristics were analyzed based on the mathematical model of the grid-connected inverter which was modulated by space vector pulse width modulation. Therefore, a multi-loop feedback control structure was designed including autonomous operation power outer loop combined with autonomous function, voltage PI loop and current double pole-double zero inner loop. Finally, the MATLAB simulation was built to verify the micro-source and the grid output under different load conditions, which proved the effectiveness of the proposed control strategy.