Optimization Design Of Intelligent Substation Network Based On EPON Technology

At present,intelligent substation communication network generally adopts "three layers and two networks" framework.Because the process layer network generally adopts "point to point" information interaction mode,it is not conducive to improve the sharing of the whole site information.In this paper,the EPON intelligent substation communication network is constructed,and the real-time,reliability and security of the network are simulated and analyzed.The effectiveness of the network designed in this paper is verified by engineering design and network test analysis.Firstly,the networked communication technology of intelligent substation is analyzed.Through the comparison and analysis of different networking schemes of station control layer and process network,the advantages and disadvantages of the current networking mode are clarified.Secondly,the principle of EPON communication technology is studied and analyzed,and the networking scheme of "three layers and two networks" and "three layers and one network" based on EPON technology is constructed.Meanwhile,the network structure diagram is constructed,and the information interaction principle between different devices is expounded.Through comparative analysis,the network scheme of "three layers and one network" based on EPON technology is determined as the network scheme of intelligent substation communication network.Then,the EPON network delay model is constructed,and IPACT algorithm is used to study the detailed calculation method of uplink and downlink delay,and the specific calculation model and expression are established.By comparing the calculated results with the delay standard required by the message,a quantitative method is provided to verify the real-time performance of data transmission in "three-layer one-network" EPON network.An EPON network encryption scheme based on AES and ECC is designed,and the working principle and advantages of the scheme are described.Finally,the intelligent substation communication network based on EPON technology is optimized and transformed and its performance is tested and analyzed.Taking the 220 k V line interval of a substation in Handan as an example,the EPON network of "three layers and one network" is optimized and transformed,and its real-time performance and security are tested and analyzed.Through the comparison and analysis of the theoretical calculated value and the actual measured value,it is proved that the communication network designed in this paper has good real-time performance and security.