Coupling Modeling And Simulation Of Distribution Network Cps Considering Various Communication Modes

With the national goals of "carbon peaking" and "carbon neutrality”,the country’s smart grid is constantly transforming and developing toward the energy Internet.The interaction between the power physical system and the communication system is increasingly frequent.It has gradually evolved into a complex,multi-dimensional,heterogeneous cyber-physical power system(Cyber-Physical Power System,CPPS)coupled with the power physical and information networks.In addition,the automated operation of the distribution network relies on the timely transmission of massive amounts of data.It is often not advisable to adopt a traditional single communication method.Therefore,the distribution network communication network needs to combine various communication methods to provide a real-time data transmission path for the safe operation of the distribution network and distributed power management.Given these backgrounds,this dissertation focuses on the distributed power control business.It mainly explores distributed power modeling and control,model of cyber-physical coupling system of distribution network,performance simulation,and evaluation of distribution network communication network with multiple communication methods.The power information real-time simulation platform is researched.The detailed contents are as follows:(1)The coupled modeling of the distribution network cyber-physical system for distributed power control is studied,and the corresponding models are established according to the principles of the physical system and the information system.The physical system of the distribution network focuses on distributed power modeling and active power control.The active power control algorithm and hybrid control architecture based on the consistent active power increment is adopted.In the aspect of information communication system,the information communication system is divided into the information communication network model and information communication network coupling interface model.The theory of multi-group and finite automata is used to establish interface equipment model,multiple communication modes model and control center model.An integrated model of distribution network cyber-physical coupling system for distributed power control is established.Finally,the simulation test is carried out by an actual distribution network example in a certain place,which verifies the effectiveness of the proposed distributed power control architecture and active power control algorithm.Using the proposed distribution network cyber-physical system coupling model,the communication delay in distributed power control is calculated and analyzed.The influence of communication delay on distributed power control is analyzed.(2)Modeling and Simulation of Distribution Communication Network and Research on Network Performance.The architecture of a modern distribution communication network with many distributed power sources is introduced.It is divided into the terminal layer,access network,and backbone network.According to the principle of matching the communication mode of the distribution communication network,different communication modes are selected for different layers of distribution communication network.OMNET++is used to establish the distribution communication network workstation,terminal and server model.Four communication mode models of optical fiber,power line carrier,5G,Wi Fi is established.Based on the analysis of the performance evaluation indicators of the distribution communication network,a multi-index comprehensive evaluation method of network performance is proposed.A distribution communication network model considering various communication methods is established in OMNET++.The network performance of different communication modes in different communication scenarios is studied,and the effectiveness of the distribution communication network model and the proposed evaluation method is verified.(3)A real-time simulation platform of power information based on RT-LAB and OMNET++ is designed,which can realize simulation of various communication modes.In order to realize the scene where the actual controller is connected to the real-time simulation platform,the DSP controller is connected to the simulation dispatching control center.In order to realize the man-in-the-middle attack scenario,a man-in-the-middle attack platform is designed based on Labview,which can realize the functions of data interception and data tampering.In order to realize the smooth transmission of data in the simulation process,the data interaction interface based on Socket is studied.In order to realize the orderly transmission of data among multiple systems,a parallel dynamic event-triggered time synchronization method is studied.Finally,using the built simulation platform,the differences of control effects under different communication methods and different communication scenarios are studied.