Abstract:

To prevent the cascading failure of complex networks effectively, the capacity allocation strategy of the networks is investigated. A limited resource cascading failure model is proposed, in which the total capacity of the networks is invariant and the tolerance parameters are variant. The model can be used for comparison of the efficiency of different capacity allocation strategies. On the basis of the model, four typical capacity allocation strategies are proposed, and the efficiency of strategies to prevent cascading failure in scalefree networks triggered by removal of a single node with highest betweenness is analyzed. Simulation results indicate that the load preferential capacity allocation strategy is the best and the importance of the node is strongly related with the betweenness of the node and weakly related with the degree of the node. By optimizing the preferential exponent of the load preferential capacity allocation strategy, the dynamic invulnerability of the complex networks is improved.