Aiming at the photovoltaic generation and energy storage devices connected to the distribution network, considering the problem of voltage optimal control problem based on voltage and reactive power coordination, this paper studies the optimal voltage control strategy under “SourceGridLoad” interaction. For photovoltaic power generation and energy storage distribution network, LQRbased optimal voltage control model is built. Then ADPbased online optimization method is proposed in order to deal with the variety of the steadystate operation points and the unknown or inaccurate model and parameters. Simulations are accomplished to verify the effectiveness of the proposed method under different operation conditions of the network. The results show that the proposed control law is effective in voltage improvement. Therefore the proposed method is beneficial to power system online control problems.