Abstract:Due to the uncertainty and randomness of photovoltaic power generation, the stability and security of power system are hidden dangers. Introducing energy storage device into distribution network photovoltaic system can improve system economy and power quality. Based on the analysis of the characteristics of residential load and industrial load, combined with the electricity price policy of our country, the paper takes the maximum net profit of the PV-storage system as the goal, and constructs the investment income model. On the basis of satisfying the power balance and the performance constraint of energy storage battery, the YALMIP toolbox and CPLEX program are selected to solve the problem in MATLAB. Finally, the above optimization method is applied in the IEEE-33 node system for impact analysis, and the results prove the effectiveness of the PV-storage system energy storage optimization configuration strategy based on the net profit as a technical index.