Abstract: Aiming at the problems of unstable voltage and uneven power output in smart microgrids, a coordinated optimization strategy based on hierarchical control for photovoltaic and energy storage combined smart microgrids is proposed. Analyze the load power boundary of intelligent microgrid systems containing photovoltaic and energy storage devices under different operating modes, and propose a discharge droop control strategy and charging fuzzy control strategy based on hierarchical control to determine the new load power boundary of the photovoltaic and energy storage joint intelligent microgrid. Subsequently, a coordinated optimization strategy for photovoltaic and energy storage joint intelligent microgrid based on hierarchical control was designed, which can achieve automatic adjustment and distribution of charging or discharging power between energy storage modules, enhance the load power carrying capacity of the intelligent microgrid, and overcome voltage fluctuations. Finally, the simulation results obtained from the simulation model and experimental platform confirm the feasibility of the proposed coordinated optimization strategy, which is conducive to improving the voltage stability, safety, and economy of the photovoltaic and energy storage joint intelligent microgrid.