A Power Grid Capacity Margin Model and Calculation Method Considering the Interaction of Source-Load-Storage

In order to address the balance between new energy consumption capacities, guaranteed power supply and operational economy in the process of capacity margin planning for power grid equipment, this paper proposes an optimized decision-making model and calculation method for power grid equipment capacity margin considering the interaction of source-load-storage. This paper first established a calculation method for the flexibility margin capacity of up and down regulation on the power supply side. Subsequently, the grid side capacity margin index CBM was redefined to reflect the comprehensive impact of the economic indicators of large-scale new energy access and the reliability indexes of power supply. Finally, the defined capacity margin model was quantitatively expressed and analyzed through examples. The CBM retention values configured by the method proposed in this paper have been verified to reduce the probability of power system load loss and wind abandonment, while also taking into account economic benefits and improving the reliability and economy of system operation.