Vulnerability assessment of power system based on Theil entropy of branch potential energy

Abstract

To achieve the safe operation of power system and prevent cascading failures, a vulnerability assessment method of power system is proposed based on the state correlation of branch fault. Firstly, a weighted correlation network based on the branch potential energy is established by using the state transition relationship of the two-level cascading failures. Secondly, the vulnerability assessment model of power system is constructed by applying the Theil entropy theory into the weighted correlation network. Finally, the simulation results on IEEE_39 bus system and an actual power system show that the model can not only evaluate the vulnerability of power system effectively but also find the vulnerable branches in power network more accurately.