Abstract: Achieving accurate and efficient power distribution between microgrids is an important control goal of hybrid microgrids. However, due to the existence of line impedance,loads and low-speed communication,it is difficult to solve the power balance between hybrid microgrids and the interface converters with the traditional droop control at the same time. This paper proposes a hybrid microgrid power balance control strategy based on low-frequency and low-amplitude AC signal injection. The AC signal is injected into the public DC bus to establish the frequency-active power droop relationship of the DC microgrid. The global variable frequency is used to improve the traditional hybrid droop. The control strategy can solve the circulating power between parallel interface converters and realize the precise distribution of power between hybrid microgrids at the same time. The feasibility and effectiveness of the proposed method are verified by simulation.