Abstract: The high proportion of distributed photovoltaic access to the active distribution network causes a serious problem of overvoltage. The fundamental reason is the reversed power flow caused by photovoltaic generation, mainly in the 400V network. At present, there is no effective control method. This paper analyzes the influence mechanism of the overvoltage and power flow caused by distributed photovoltaic in active distribution network, and proposes a distributed energy storage scheme to solve the overvoltage. The characteristics of mainstream battery types are compared and analyzed. The advantages of liquid-cooled modular energy storage are studied in detail for the application scenarios of active distribution network. In order to avoid the serious overvoltage at the user side, distributed photovoltaic and energy storage are proposed to access to the low voltage side of the transformer through the low voltage private network. The typical 10 kV distribution network system is taken as an example for modeling and simulation verification. The results verify the overvoltage problem of active distribution network, and the distributed energy storage scheme can well solve the overvoltage problem and transformer reverse overload problem.