Author(s)

Sun Zhiyuan, Sun Yan, Liang Shuiying

Corresponding Author

Sun Zhiyuan

ABSTRACT

Some key nodes in the power grid may have an important role in the cascading failures. In order to improve the accuracy of key node identification and prevent the occurrence of cascading failures more effectively, this paper proposes a key node identification method based on the node flow. This method uses the 2 factors, which are the change of the network capacity after failure and the electrical coupling strength between nodes, to quantitatively characterize the important position of a node in the transmission of cascading failures. The proposed method can quantitatively characterize the influence of the power flow caused by the interruption of a certain AC/DC line to the surrounding line. It can quickly and accurately identify the weak nodes in the power grid and judge the important role that they played in the evolution of AC/DC power grid, which are of great significance to prevent the evolution from cascading failure system to the critical state. The simulation results of a regional power grid system show that the proposed method can be used to identify the key nodes in the power grid more effectively and accurately.

KEYWORDS

key node, power flow transfer, AC/DC hybrid power grid, node flow, cascading failures