Research on network invulnerability based on DWS model considering cascading failure in power data network

With the analysis of the actual structure property of data network in power grid, a network model based on a layered structure named DWS is introduced in this paper. In this DWS layered network featured with the tree structure, aiming to meet the requirements of network operation reliability, we combine the relative access distance with node degree for the nodes for lower levels to add redundant connections correspondingly. In order to evaluate the network invulnerability under the change of weight factor for relative access distance, the load redistribution and the impact of different node capacity redundancy are also considered to illustrate the typical cascading failure process. To note that, the scale in the remaining effective connected components after the deliberate attack is the major measurement of structural invulnerability. In the simulation, it has been illustrated that, with the improvement in the weight of relative access distance and in the capacity redundancy, the cascading failure impact on the layered network structure in the condition of heavy load is decreased obviously, which shows the better structural invulnerability and ensures the applicability of the data network model which we proposed.