Abstract: With the large-scale access of distributed new energy such as photovoltaic and wind power, the increasing load type and the increasing difference of peak-valley, voltage fluctuation and transformer overload often occur in weak grid .These problems have brought great inconvenience to people's production and life. In order to solve this problem, this paper presents an active/reactive power active support control strategy based on PV and battery generation system. The control strategy takes the current voltage and current data as input, the capacity of the transformer and PV- battery generation system as the constraint condition, and through adjust the output of active/reactive power to achieve the goal of improving grid-connected point voltage stability and reducing the difference of peak- valley. Finally, the experimental results show the feasibility and effectiveness of the control algorithm.