Main Transformer Capacity Demands Analysis Method of 220kV Substation based on N-1 Failure

• Main Authors: Wang, Canlin, Hou, Yanruo, Chen, Jin, Jiang, Shiyao, Xie, Yuzheng
• Format: Conference Proceeding
• Language: English
• Subjects: 220kV substation; index; Linear programming; load rate; main transformer capacity; Power grids; Power supplies; Power system stability; Stability criteria; Substations; Transformers
• ISSN: 2693-2776
• DOI: 10.1109/IMCEC59810.2024.10575137

The 220kV substation undertakes the intermediate link of power supply and demand. Substation expansion planning is one of the important contents of substation planning research. In this paper, the load rate of the main transformer N-1 failure in the substation and the maximum load available for supplying in the substation under different scenarios are analyzed first. Next, the demand for the main transformer capacity of the substation is calculated. The demand index of transformer capacity is proposed. Considering the difference between the normal operation load ratio of the substation and the number and capacity of the main transformer, the difference of load rate before and after the increase of the main transformer capacity is calculated. The index of 220kV substation load rate improvement is proposed. Then, the load transfer ability index of the 220kV substation is proposed, considering the adjustment of operation mode to make the substation not overloaded. Finally, the objective function is established. The 220kV substations are sorted according to the value of the objective function, and then the 220kV substations that need to increase the transformer capacity most are found. A provincial regional power grid is used to verify the effectiveness and adaptability of the proposed method.