Cascaded fault model of power grid with active defense strategy

With the rapid development of power system, its potential hazards are also increasing. Paying attention to grid cascading faults and building a robust smart grid have become a hot topic in current research. Based on the complex network theory system and the existing electrical betweenness model, a cascading failure model with active defense strategy has been proposed and its robustness has been analyzed. When the node is attacked and fails, the distribution principle of "the capable nodes are always busy" is adopted to distribute the failure load. That is, the larger the residual load capacity of adjacent nodes, the more load will be distributed. An active defense strategy has been proposed to artificially remove a small number of nodes with a large "removal ratio", reduce the electrical betweenness of other nodes, and prevent the propagation of cascading faults and power grid collapse. Through IEEE118 and IEEE300 power grid system simulation, the effects of key factors such as attack mode, allocation strategy and tolerance parameters on network robustness have been studied. The experimental simulation shows that the power grid cascade failure model with active defense strategy can better inhibit the further spread of power grid cascade faults.