Power coupling is a common problem in a microgrid because of the differences in impedance ratios between low voltage microgrid lines and traditional high voltage transmission lines. A virtual power V/f droop control method based on coordinate rotational transformation is proposed to handle this problem. The method achieves the decoupled real and reactive power control through orthogonal transformation matrix. By improving the voltage-frequency droop control， a new drooping restriction control algorithm is also introduced. Furthermore， a low pass filter is designed specifically to reduce the harmonic effect and improve the control accuracy. Taking the load disturbance of microgrid in the islanded mode and its transformation from islanded mode to interconnected mode into consideration， the good adaptability of low-voltage microgrid controller is proved by simulation results. Experimental results indicate that the proposed method can achieve the load power sharing effectively in the low-voltage microgrid， with relatively stable frequency and amplitude， good dynamic effect， and enhanced accuracy and stability of system power sharing.