Compared with fossil energy power generation, the use of new energy such as wind power and photovoltaic power generation is conducive to energy security and social sustainable development. However, large-scale wind and photovoltaic power in national grid are seriously challenged by the overall dispatch of the power system, due to the regional, intermittent, random and unpredictable of wind and light. This study optimizes the objective function and the inter-regional tie-lines of the mid-to-long-term wind power acceptance capacity assessment model, and adds photovoltaic unit output constraints. The system has been practically applied in a province and a region, assisting the grid power system to determine power generation plans and unit maintenance arrangements. It can reduce the occurrence of new energy abandonment, and provide effective guidance for the actual dispatch and planning of power systems through visualized results.