Research on the electric power grid vulnerability under the directed-weighted topological model based on Complex Network Theory

The vulnerability of electric power grid under the topological model is analyzed based on Complex Network Theory in this paper. And a directed-weighted topological model based on the P-Q networks decomposition is proposed. Firstly the electric power network topological model is decomposed into active and reactive networks ones. Then the direction and weight of line, which is according to the operation state and the physical characteristic of electric power network respectively, is computed. Lastly combination with Complex Network theory, the vulnerability of electric power network is analyzed. The results of IEEE 14 bus power system example showed that the proposed model has a better reflection to the operational and physical characteristic of power grid. And comparing with others vulnerability and sensitivity analysis methods, it has a more effective identification to vulnerable part of the network. Meanwhile, it is verified that the proposed model is reasonable and effective.