The Multi-Scenario Capacity Demands Calculation and Evaluation Method Considering the Power Supply Ability of 220kV Substation

To obtain the conclusions of power grid substation capacity planning with certain universal applicability in engineering practice, based on the "N-1" security criterion of main transformers and the power supply ability of 220kV substations, the capacity demands of 220kV substations under different scenarios are analyzed and evaluated. In this paper, the substation capacity demands under normal operation mode and the N-1 failure of the maximum capacity main transformer are analyzed. Next, the substation capacity demands, capacity expansion schemes, and the improvement of power supply ability after expansion under different scenarios, such as different numbers of transformers, different transferred load quantities, and different transformer capacity combinations, are further analyzed. Then, considering the economic benefits and long-term adaptability of substation capacity expansion, comprehensive evaluation indicators are proposed. Finally, the effectiveness and adaptability of the proposed method are verified through an actual power grid.