Research On Real-time Topology And Automatic Maintenance Technology Of Power Grid For Plant And Station Anti-misoperation

In recent years,with the development of intelligent substations,the number of operating scenarios has gradually increased,such as one-key control,on-site operation,remote operation,intelligent inspection,etc.As the degree of unmanned substation increases,these complex operating scenarios are gradually dependent on automation programs,but the traditional five-defense system can no longer meet all the situations in the current operating scenarios.Therefore,an intelligent anti-misoperation system that can adapt to all operating scenarios and verify each step of the switching operation is necessary.The essence of switching operation is to control the running status of the equipment by changing the topology of the network,so real-time topology analysis is very important in the intelligent anti-misoperation system of the substation.However,the traditional topology analysis module only transforms the physical model into a node and bus model,and these basic topology data are difficult to directly provide intuitive topology data to the intelligent antimisoperation system,which can not well support the rule judgment of the antimisoperation system under various topology structures.In view of the above problems,this paper optimizes the traditional topology analysis method and designs a real-time topology and automatic maintenance technology for substation anti-misoperation judgment.The research contents is as follows:Firstly,the electrical and management rules for the operation of switching in substations were comprehensively refined,and the demand for an intelligent antimisoperation system was clarified.The dynamic and static topology data that the topology analysis module needs to automatically generate was summarized according to the requirements,and a basic topology data model was constructed.Based on the basic data,a model structure for maintaining data was designed,including equivalent branch data,switch interval data,main electrical connection data,and index data for rapid topology analysis.A method for automatically identifying dynamic attribute data based on topology was proposed.The expression of the physical and bus topology models was elaborated,and the conversion from the physical model to the bus model of the substation topology was implemented based on tree search algorithm.The characteristics of depth-first search and breadth-first search algorithms were compared in detail.The breadth-first search algorithm was selected as the basic method for topology analysis through analysis.Based on the breadth-first search algorithm,a method for analyzing basic dynamic attribute data was designed,and the functions such as endpoint equipotential judgment,device obvious break point identification and device running state are realized,and examples were given in turn.A method for automatically generating static attribute data based on topology was proposed.The automatic division of switch intervals was implemented on the basis of the initial topology structure,and interval attribute labeling was carried out.Topology analysis was performed based on intervals as the basic unit,and the automatic recognition of various forms of main bus in the substation was achieved.These data can be directly applied to the rule judgment process of the anti-misoperation system,making the system more universal and not restricted by different topology structures.Finally,the basic topology data of a 220kV substation in Hefei are used as the example to test the method designed in this paper.The results show that the topology analysis and automatic maintenance method designed in this paper can quickly and accurately generate topology data that meet the requirements of antimisoperation,which greatly improves the work efficiency and promotes the intelligent development of substation.