Analysis of Vulnerability indices of power grid integrated DG units based on Complex Network theory

The application of Complex Networks have significantly advanced in the last decade and brought about valuable insights to properties of real world systems by evaluating their structure, topology and construction. Similarly here an electric power network is considered as a complex network where its buses are the nodes and edges are the links of a complex network graph respectively. Power grid Vulnerability with Distributed Generation (DG) is investigated in this paper by evaluation of topological indices for structural vulnerability analysis. The efficacy of graph theory or complex network theory is based upon a combination of power flows and scale free graphs that makes it possible to analyze the risk scenarios according to those events which may result in cascading failures in a large power system. Here a MATLAB simulation is conducted to realize two vulnerability indices for vulnerability assessment of the standard IEEE 57 bus system which is supported by overall grid characteristics.