A Power Grid Cascading Failure Model Considering the Line Vulnerability Index

Abstract

In this paper, a power grid cascading failure model is constructed. The cascading failure model considers two aspects: the structural vulnerability and the state vulnerability of power grid. Firstly, the line fault of the power grid is constructed, including the power grid model, dispatching center model and the selection of the next level fault line. Then, the mechanism of cascading failure is briefly described and the process of cascading failure is described in detail. Finally, the cascading failure model is constructed in IEEE-39 bus system. The simulation results show that the cascading failure which only consider the vulnerability index of the line degree have the greatest topological damage degree, and the cascading failure which only consider the vulnerability index of the line risk value have the greatest harm to the lines connected with the generator nodes. The cascading failure model considering structural vulnerability and state vulnerability is more comprehensive and more in line with the actual situation .