Modeling Of Regional Protection And Self-healing Control System For Distribution Network,and Performance Analysis Of Its Communication Network

This paper combines the construction background of the smart distribution network and the needs of new protection applications to study the regional protection and self-healing control system architecture of the distribution network;starting from the needs of information interconnection and sharing,the IEC61850 modeling idea is used to establish the distribution network protection control system.Describe specifications and implement unified modeling of protection and self-healing control systems;in order to support protection control performance,study the configuration of communication networks suitable for distribution network self-healing control systems;starting from engineering application conditions and business needs,Developed a regional protection and self-healing control system for the distribution network to reliably and effectively support a new business system for regional protection and control in a master-slave manner.The main conclusions of this article are as follows:(1)Propose a distribution network regional protection and self-healing control system based on a master-slave architecture.The regional centralized system can cover the global information of the distribution network in the region.Control and exchange information online with the distribution network sub-station to realize information interconnection and sharing.The terminal hardware architecture of the distribution substation of the server’s calculation level and the distribution automation station with multiple I / O interfaces is engineered,and the regional protection and self-healing control system of the distribution network is developed.(2)Through the idea of object-oriented modeling of IEC61850,the primary model of the regional distribution network,the secondary model of the IED of the regional protection and self-healing control system of the distribution network,and the description of the relationship between the secondary equipment are unified.Based on the technology of traversing SSD elements,the description of secondary device association relationship is realized.From the unified description of the information modeling and the description of the secondary equipment association model,the problem of inconsistent information analysis and description of the operation and maintenance business in analyzing data and other business operation and maintenance is solved.(3)A network model adapted to the regional protection and self-healing control system of the distribution network is proposed.By analyzing the business composition of the regional protection and self-healing control system of the distribution network,the size of the network flow is quantitatively evaluated,which provides a basis for the engineering application of the regional protection and self-healing control system of the distribution network.The business messages carried by the system are analyzed and mathematically modeled to lay the model foundation for the system simulation in the next chapter.(4)Developed the regional protection and self-healing control system of the distribution network,and set up OPNET simulation model and RTDS closed-loop test model to simulate the network performance according to the actual application of the project.Experiments show that the network configuration of a typical regional distribution network in a certain area can carry the business flow of the system and can support the master-slave business requirements of the system.The research results have been applied in the actual engineering projects of China Southern Power Grid and achieved good technical and economic benefits.