Reasonable storage capacity configuration can give full play to the complementary features of wind/PV/storage hybrid system. Based on Modelica noncausal modeling language

dynamic description of the wind/PV/storage hybrid system with stochastic parameters is performed. The two-stage model is adopted to optimize the energy storage capacity in the wind/PV/storage hybrid system. The outer model takes the initial investment cost of energy storage system

the operation and maintenance cost of energy storage

and the penalty cost of the fluctuation of the contact line power as the objective function. The inner model takes the minimum power fluctuation of the contact line as the objective function

and then uses the operational planning algorithm to solve the problem. Finally

a typical daily calculation example is selected to determine the operation mode of the energy storage system in combination with TOU price. The simulation results verify the effectiveness of the proposed energy storage capacity optimization method in this paper

namely

the photovoltaic and wind power generation are given priority in the 0:00～6:00 period in combination with the TOU price.