Fast Assessment Method for Transient Vulnerability of Transmission Lines Based on Kinetic Energy Injection Betweenness

A novel fast assessment method for transient vulnerability of transmission lines was presented,which made use of rotor kinetic energy and branch potential energy in a very short period of simulation.Betweenness with resistance weight was introduced to fit topology distribution of kinetic energy heuristically.The normalization sum of branch potential energy and kinetic energy distribution were defined as vulnerability indices.And then,relative and integration indices were designed to describe transmission lines' disturbance level considering single fault and preset-contingency list respectively.Local network vulnerability was also analyzed.Because of application of complex network theory for kinetic energy injection fitting,calculation of extreme value and inflexion points for augmented power grid's branch transient potential energy in traditional methods can be avoided,which saves integral step in dynamic simulation.Combined with alert scan based on potential energy boundary surface(PEBS) method,a complete algorithm for assessment of power grid transient vulnerability was established.The proposed method can be applied to many fields,such as dispatch monitoring,cutset analysis,islanding and separation prediction.