Virtual Power Plant Communication Network Information Modeling And Reliability Analysis

In the development stage of the energy Internet,the virtual power plant is considered to be another means to solve the problem of energy shortage,the contradiction between the power system and the distributed energy unit and the research and practice of the virtual power plant is still in its infancy,so its construction standards are gradually being formulated,and the scientific and technological problems are carried out step by step.Cyber-physical convergence is an inevitable trend in the development of virtual power plants,but in the process of convergence,multiple devices,heterogeneous networks,and standardized protocols will bring more risks and challenges to cyber-physical interaction and security.The virtual power plant communication network has a lot of information data.A large computing load,and the communication infrastructure plays a vital role in the reliable operation of the virtual power plant,so how to ensure that the virtual power plant reasonably regulates the distributed energy unit and builds a virtual power plant with strong reliability has become a research hotspot.In this paper,the virtual power plant is modeled and simulated by using the analysis method of complex network,which is summarized as follows:In order to ensure the information security and reliable transmission of virtual power plants,this paper constructs a hierarchical communication architecture for virtual power plants.According to the communication services requirements of virtual power plants,the adaptability of introducing communication protocols into virtual power plants is elaborated.In order to deeply grasp the communication mode under the operation of the virtual power plant,the information exchange process between the virtual power plant control center and different entities is analyzed.Aiming at the problem of uncertain risk caused by the scheduling plan and information interaction of virtual power plant,this paper uses an algorithm to construct a virtual power plant control mode network,and analyzes the control mode of virtual power plant based on complex network theory,and compares the characteristic parameters of different control mode networks.The reliability of the network in different control modes is studied when it is deliberately attacked and randomly attacked,and the experimental results show that the centralized control mode network cannot resist deliberate attacks and can resist certain random attacks.Decentralized control mode networks and fully decentralized control mode networks are less resilient to deliberate attacks than random attacks.Aiming at the problem that the scale of cascading failures may expand due to the failure of key nodes in the communication network of virtual power plants,this paper proposes a reliability optimization method for communication networks based on the coupling characteristics.Three network models of cyber-physical system architecture of virtual power plants are established.Small-world networks are used to simulate information networks in centralized and decentralized architectures,and K-means algorithm is used to construct information networks in completely decentralized architectures,and scale-free networks are used to simulate three The power network in the cyber-physical system is analyzed,and the complex network characteristic parameters of the cyber-physical system architecture of three virtual power plants are analyzed.The network cascading failure process of three virtual power plant cyber-physical system architectures is studied,and the number of surviving nodes and surviving clusters is used as an index to evaluate the network reliability of virtual power plant cyber-physical system.The cyber-physical systems of the virtual power plant under the three architectures can resist random attacks.In view of the fact that the three architectures cannot resist deliberate attacks well,a method for protecting key nodes in the communication network of virtual power plants is proposed.Protecting key nodes can effectively improve the network reliability of virtual power plants.