In order to make full use of the energy of wind-photovoltaic power generation and rationally dispatch pumped storage power stations, this paper proposes an optimal dispatching model and method for pumped storage power generation based on the maximum daily power supply, aiming at the actual demand of the project that the wind-photovoltaic storage combined power generation system interconnected through VSC-HVDC grid supplies power to remote load centers. The optimal power flow method is used to calculate the all-day renewable energy consumption limit of the power receiving area (load center). Taking this limit as constraint and considering the reservoir capacity and operation condition of pumped storage station, an optimal power dispatching model for pumped storage station is established. The proposed segmentation method and equivalent area method significantly improve the calculation speed of the optimization model. The simulation case is based on the structure of wind-photovoltaic storage power system and flexible VSC-HVDC power grid in a certain area, the load center power grid is simulated with the IEEE30-bus system. The results of several calculation methods of maximum power supply are compared, which verifies the effectiveness of the proposed methods and models. This work is supported by Project of Beijing Science and Technology Commission “Technical Research on VSC-based DC Grid Collecting Renewable Energy Integrating AC Power Grid Dispatch” (No. Z161100004816025) and Science and Technology Project of State Grid Corporation of China “Technical Research of ±500 kV VSC-based DC Grid Dispatch”.