How to achieve effective management and optimized operation of the photovoltaic storage direct-flexible system in low-carbon power supply stations to improve energy efficiency and reduce carbon emissions is a difficult problem that we are facing now. This paper studies the source-grid-load-storage port interaction model of the photovoltaic storage direct-flexible system in low-carbon power supply stations, hoping to effectively solve this problem. In the implementation process, the model adopts multiple strategies to optimize the interaction between power sources (source), power grids (grid), loads (load) and energy storage (storage). First, the volatility and uncertainty of power supply are balanced through source complementarity. The source-grid coordination strategy ensures that new energy and conventional power sources can jointly provide stable power output to the power grid, while reducing the regulation pressure on the power grid. The model also transforms user load into adjustable resources for the power grid through intelligent load management. In addition, the grid-storage interaction strategy provides the power grid with multiple services such as peak load regulation, frequency regulation and backup. Finally, the source-load interaction strategy achieves effective management of flexible loads by guiding users to change their electricity usage habits and behaviors. After the model is applied, the energy utilization efficiency of the low-carbon power supply station is improved, and the model also performs well in reducing carbon emissions. For example, the carbon emissions of the first power supply station before the application of the model are 950 kg/day, which is reduced to 851 kg/day after application, and the emission reduction rate reaches about 10.4%. The results of this paper not only prove the effectiveness of the model, but also provide a feasible reference and reference for other low-carbon power supply stations.