The Research On The Performance Of Intelligent Substation Communication System Based On IEC 61850

With the rapid development and organic combination of power and communication technology,new smart substations based on the IEC61850 communication standard have become the development direction of future substations.As the technical framework of the new generation of smart substations,the network performance directly affects intelligence.The reliable realization of substation related functions has important research value and practical significance.The purpose of this paper is to improve the real-time performance and reliability of communication through research,and to obtain relevant solutions to guide the construction and optimization of communication networks in smart substations.This article briefly introduces the IEC 61850 communication standard;specifically analyzes the intelligent substation system model based on the standard,and explains the related technologies and typical communication network architecture;introduces two networking methods and three types of intelligent substations Network topology.It explains the specific requirements of IEC 61850 for the performance of smart substation communication network from two perspectives of real-time and reliability.In view of the fact that the data flow and service flow models in the previous studies were relatively simple,the real-time performance only looked at the overall delay and did not discuss the problem of various message delays separately.This paper proposes a new solution process: using OPNET simulation software,with D2-1 smart substation as the research object,detailed design and modeling of various data messages,network models and communication services,enriching the data flow and business flow Model: Use the built simulation model to simulate the communication network of three types of typical topologies,discuss the real-time performance according to different communication service messages,and comprehensively evaluate the real-time performance of each topology.In view of the problems in the VLAN division method in previous studies,this paper proposes a VLAN division scheme that classifies related devices according to business packets: Take the star topology with the best real-time performance in the topology as an example.The communication delay of similar messages,in which the sampling value message and the device status information message have achieved better real-time improvement effects,and the delay has been reduced by 67.05% and 34.36% respectively.Based on this solution,this article also proposes a dual-star topology optimization solution,which improves the real-time performance of various messages passing through the central switch across subnet intervals,and reduces the delay by an average of about 16.55% on the basis of the original VLAN division..It is demonstrated that the solution can share the workload of a single central switch to further improve the real-time performance of the communication network of the smart substation.In order to solve the problem of the lack of reliability research methods and the difficulty of quantitative estimation,this paper proposes to introduce the reliability block diagram model theory into the reliability modeling of the intelligent substation communication network.By establishing the communication network reliability model of the D2-1 smart substation star,ring,bus and double star topology,the overall reliability parameter expression of each topology is obtained,which can provide for improving the reliability of the substation communication network structure.Theoretical basis.Refer to the specific reliability data of the equipment,calculate and analyze the reliability index of each subnet structure,and derive the global reliability index layer by layer.After data comparison,the double-star topology proposed in this paper has the longest mean failure interval of 4.03 years,and it is concluded that the redundant topology of the topology has relatively optimal reliability.