Modeling And Robustness Analysis Of Micro-energy Grid CPS

Under the research background of Cyber Physical System(CPS),with the advancement of a new round of energy revolution,multi energy complementary coupled micro energy networks have emerged.The continuous increase in the scale and coupling degree of the micro energy network CPS network has greatly increased the complexity of system operation and control,thereby seriously affecting the safe and stable operation of the system.Therefore,studying CPS modeling and robustness analysis of micro energy networks has important practical significance.This article takes the micro energy grid under the background of CPS as the research object and conducts the following aspects of research:(1)Analyze the robustness of micro energy grid CPS from the perspective of physical attacks.Firstly,taking the micro energy network of E33-G14-H6 node system and E123-G48-H32 node system as research objects,based on complex network theory and sampling simplification principles,using Python language in the development environment of Spyder,a complex network topology model of the micro energy network is established by importing tool libraries such as Network X,Matplotlib,Pandas,etc.Secondly,network efficiency,the relative size of the largest connected subgraph,local information indicators,and global information indicators are introduced to evaluate the robustness of the micro energy grid system.Based on the fractal characteristics of the network,a network reconstruction improvement strategy is proposed to enhance the robustness of the micro energy grid system.Finally,a comparative analysis was conducted on the impact of different attack methods on the robustness of micro energy network CPS in the initial network and current network scenarios of different network sizes.At the same time,a comparative analysis was conducted between the original network and the reconstructed network,and the effectiveness of the proposed improvement strategy was verified through simulation.(2)Analyze the robustness of micro energy grid CPS from the perspective of cyber attacks.Firstly,a thorough analysis of the state estimation and bad data detection processes was conducted,and the prerequisites for the successful initiation of information attacks were obtained.Secondly,a mathematical model was established using the attack method of load redistribution,combined with the scheduling model of the micro energy grid system and the cascading fault model to form an economic loss assessment model under information attacks,and the robustness of the micro energy grid system was characterized by economic loss.Finally,the electrically coupled micro energy grid system was used as the research object to simulate and verify the impact of different attack methods on the operation of the micro energy grid system under different attack resource scenarios.The robustness of load nodes under different attack methods and attack resource scenarios was quantitatively analyzed.Corresponding protection measures have been proposed for different attack methods to enhance the robustness of the micro energy grid system.(3)Based on the consistency algorithm,the stability of CPS of micro energy grid is analyzed.Firstly,at the physical level,an energy network model and an energy coupling model were established.At the information level,the application field of traditional public information models has been expanded from power systems to micro energy grid systems,and an information system model has been established.Secondly,based on the consistency algorithm,the effects of input delay,communication delay,and coupling strength on system operation were considered.Finally,virtual partitioning was performed on the hypothetical micro energy grid simulation system to obtain an equivalent topology diagram.The simulation verified the effectiveness of the consistency algorithm and the impact of network latency and coupling strength on the stability of the micro energy grid CPS.