| Nowadays,the large-scale interconnection of the power grid makes the power system and the information communication system complement each other,and the information communication system has become the brain of power network.And has formed information-physical system with deep fusion of it.On the one hand,the application of advanced information and communication technology enhances the observability and controllability of the primary power network;on the other hand,the failure of the information and communication system may spread to the physical power network through the coupling between the networks,then lead to intercommunication of cascading failures.In recent years,many accidents have directly or indirectly confirmed the failure of information and communication system in power outages.It plays a negative role in the blackout.The main work of this thesis is reflected in the following aspects:Aiming at the modeling of electric-information dependent network,the IEEE118 standard node system is used as the power network model,and two typical information network models are constructed.Then the cascading fault model of electric-information dependent network is established.Finally,a coupling network with control parameters is constructed.In this paper,we study the robustness of IEEE118 node system under non-random coupling between power and information dependent networks composed of two-star and network-type information networks.The concept of load capacity is introduced into power information dependent network,and a load dependent network model and cascaded fault failure algorithm are built.Based on the dependence networks of IEEE118 node standard system and two-star and network-type information networks.By comparing the connection mode,the attack mode,the average degree and the single network,the paper analyzes the influence on the robustness of the electric-information dependent network.Finally,four protection strategies are proposed to deal with cascading faults of power-information dependent networks with load.It is proved that the four protection strategies can effectively improve the network robustness.Based on the proposed cascading fault model,the cascade fault simulation process based on the restoration mechanism is presented,and the cascade failure simulation flow chart with the recovery mechanism is established.Finally,through the power network of IEEE 118 standard node system and the electric-information dependent network composed of two-star information network and network-type information network,the random restoration is used.There are three kinds of recovery mechanisms,target recovery and dependency recovery,to restore the removed nodes to normal state. |
