The adjustment speed of traditional energy storage control is relatively slow,making it difficult to meet the precise control after a high proportion of new energy is connected to the power grid. The error rate in the scheduling cycle is introduced into the optimal control strategy of the energy storage system, and the feedback error link is added before the current closed-loop control using the error rate to optimize the control of the DC/DC bidirectional controller of the energy storage battery. With the goal of minimizing the root-mean-square error between the active output and the planned active output of the photovoltaic(PV)-and-storage combined generation system,the mathematical model takes into account the limiting conditions of the state of charge of the energy storage battery and the allowable deviation of the combined power generation system. The transfer function of the BUCK/BOOST circuit in the bidirectional DC/DC converter is given.Then the PQ control strategy for the grid-connected operation of the PV-and-storage combined generation system is given, and the active power and reactive power decoupling control is adopted. Based on the MATLAB/simulink simulation platform,the simulation system of the PV-and-storage combined generation system is established. The effectiveness of the control strategy proposed in this paper is verified by the analysis of the simulation results.