Abstract: Taking into mind the plans and feasible targets for installing renewable power plants, particularly solar farms in Iran, and the fact that the energy generated by these power plants during the day and at different periods of the year is variable, sudden events such as a fall or increase in demand, as well as changes in grid components, should be taken into account when evaluating these power plants. Controlling the slope of the duck curve and grid components will rely heavily on energy storage. As a result, one of the most recent options proposed by top corporations is the use of large-scale batteries. The increase in peak load is one of the issues that will develop in Iran in the future. Given the abundance of 10 MW solar power plants in Iran, this article attempts to demonstrate the effect of installing a large-scale battery in a 10 MW photovoltaic power plant on power grid performance By DigSilent software. Finally, the grid’s power quality components are examined. The effect of installing a large-scale battery in a 10 MW photovoltaic power plant on power grid performance was explored in this article utilizing DigSilent software. Some parameters such as Maximum power generation of the plant with storage, AC Loss, Maximum power injection with storage, Operation coefficient of the upstream station, and Voltage of the 20kv bus of the upstream station, have been calculated.