Research on the construction strategy of economic dispatch scenarios for interconnected grid security

This paper, using the SCED model, develops a method for creating security-constrained economic dispatch scenarios of interconnected grids. This method is based on strategy combinations that consider optimization objectives, planning strategies, and basic data processing. It also analyzes the adaptability of different scenarios and the complexity of the subsequent model construction. Finally, it combines these analyses and calculations with actual grid data. The actual calculations show that the planning of the whole network model for a province has a load factor range of 70%–80%, which meets the actual demand. Line current errors are all within 10%. The contact line plan passing rates are all above 90%. The total cost error of M2 is 22.63%, which is much larger than the method proposed in this paper (Scenario 4). After optimization, the total cost of purchasing power for the regional interconnected grid system decreases. By constructing a reasonable combination strategy, we can enhance the availability and practicality of security-constrained economic dispatch techniques for interconnected grids.