Abstract:With the advancement of the national dual-carbon goal and the acceleration of the green and low-carbon transformation of energy, the proportion of new energy power generation in county-level power grids has gradually increased, and higher requirements have been placed on the stability of power grids. This paper focuses on the application of grid-connected energy storage technology in the integration of county-level power grid and new energy system, in order to cope with the volatility and intermittent challenges of new energy and solve the reliability problem of county-level power grid power supply with single power supply. Through theoretical analysis and practical case studies, a collaborative optimization operation strategy is proposed to improve the new energy consumption ratio of the power grid, optimize resource allocation, reduce operation and maintenance costs, and achieve a pure new energy power system operating in an isolated network to enhance the security and stability of the power grid. The research shows that the grid-structured energy storage technology can smooth the fluctuation of new energy through intelligent control, improve the grid ''s ability to absorb new energy, and release energy at peak load to relieve grid pressure. The actual case analysis shows that the strategy significantly improves the new energy consumption rate, optimizes resource allocation, reduces operation and maintenance costs, and provides strong technical support for the upgrading of county-level power grids. This study is of great significance for promoting the green and low-carbon transformation of energy and improving the stability of county-level power grids.