Robustness Analysis Of Safe Gas Supply In Urban Gas Pipeline Network

With the vigorous adjustment of China's energy structure and the implementation of the State Council's policy on accelerating natural gas development,China's urban gas pipeline network has developed rapidly.The town gas pipeline network is the lifeline of the city,and its pipelines have high pressure,and the pipeline network pipelines are mostly located in densely populated areas.The failure of urban gas pipelines will cause huge economic losses and life threats to urban residents and enterprises.Therefore,domestic and foreign scholars are extremely concerned about the safety evaluation of urban gas pipeline networks.In this paper,the safety evaluation method of urban gas pipeline network is deeply analyzed,and the robustness evaluation model of urban gas pipeline network is constructed based on reliability theory and structural robustness theory.The main technical route is as follows:Firstly,the topological structure is established by using the graph theory method for the urban gas pipeline network,the minimum route set of the pipeline network is searched by the depth-first traversal method,and the improved non-crossing minimum road set calculation method is used to calculate the town.The reliability of the gas pipeline network is connected,and then the connectivity reliability is solved by using the connectivity reliability.Secondly,the hydraulic model of the TGNET pipeline network that meets the actual situation is established based on the actual collected data,and the actuality of the pipeline network is solved by the idea of the pipeline fault.The required gas supply volume and the actual supply of gas in the pipe network are used to solve the gas supply importance of each pipe segment in the pipe network,and the importance of the pipe segment is solved by using the connection importance and the gas supply importance;then,according to the structural robustness The concept and formula of sex proposes that the comprehensive importance of the pipe segment is used as an indicator to reflect the individual nature of the pipe network,and the overall efficiency of the network of the pipe network's used as an indicator to reflect the overall nature of the pipe network,thereby constructing a global efficiency based on the network and the comprehensive importance of the pipe segment.The calculation formula of the robustness of the urban gas pipeline network;finally,using MATLAB software to program and take a city Gas network as an example,the reliability,the importance degree pipe,robust calculations and analysis,and the corresponding urban gas pipeline network security management recommendations.According to the calculation and analysis of the reliability of the gas pipeline network in a certain town and the importance of the pipe section,the following conclusions can be drawn:the reliability of each node from the gas pipeline network to the gas source point is basically presented in both normal and abnormal conditions.Distance increases the trend of reduced reliability;under abnormal conditions,the damage of the pipeline has a greater impact on the reliability of adjacent nodes.Moreover,the closer the damaged pipeline is to the gas source point,the greater the impact on the reliability of each node of the urban gas pipeline network,and the greater the impact on the overall reliability of the pipeline network;regardless of the distance from the pipeline to the gas source point The farther the remaining nodes are from the pipe section,the less the degree of influence;when a pipe is at the position of an important connection node,the pipe segment importance is higher than other pipe segments;the importance of the branch pipe network is higher than that of the other pipe segments;The ring pipe network is therefore less self-regulating than the ring pipe network.According to the constructed urban gas pipeline network robustness model,a town gas pipeline network is analyzed.The conclusion is as follows:The robustness value of the urban gas pipeline network shows an overall trend with the increase of the gas source point.The reliability analysis results of gas pipeline network are consistent,which indicates the rationality of the robustness model of urban gas pipeline network;the robustness index of urban gas pipeline network is taken as the minimum value in the numerical calculation process of pipeline network robustness.In the design of the gas pipeline network,the pipe network is compared to select a safer and more reliable pipe network design;in a ring pipe network of the urban gas pipe network,if a pipe is damaged or not,it will affect the connected user nodes.The length of the communication path with the gas source point is lower when the pipeline is broken.The robustness model of the construction is verified by the concept vulnerabilities with opposite robustness.According to the opposite trend of the two data,the correctness of the model is proved.