Study On Comprehensive Optimization Model,Algorithm And System Of High-speed Railway Large Passenger Station Technical Operations

At present,China's high-speed railway operation mileage has reached 22 thousand km,the 'four vertical and four horizontal' network has been formed and will be further expanded.The under building 'eight vertical and eight horizontal' railway lines will be the backbone of the high-speed railway network.The passenger transport volume increases year by year,but the number of operation lines has been close to the limit of f the timetable in some of the railway corridors(such as Beijing-Shanghai high-speed railway,Beijing-Guangzhou high-speed railway,Changsha-Guangzhou section),so it is difficult to meet the increasing demand of passengers,under the existing transportation organization mode and technical condition.By comparing the current situation of high-speed railway operation at home and abroad,the bottleneck of China's high-speed railway carrying capacity is mainly large high-speed railway passenger station.Usually,the large high-speed railway passenger stations are located in important nodes of the network,classified higher,busy with train operations and contains more track lines.The operation plans of such stations directly affect the feasibility and effect of the train timetable,and affect the transportation organization of the whole railway network,so the study on optimization on high-speed railway station technical operation plan has very important theory and practical significance.After analyzing the research status of related fields at home and abroad,this paper refers to relevant research,considering the problems that China's high-speed railway station organization faces,puts forward a set of optimization theory and method that suit for the status of China's high-speed railway station,then,a comprehensive optimization system for the technical operation of high-speed railway station is developed based on the proposed theories and methods.The main research work of this paper includes the following points:(1)The basic content and the working mechanism of passenger and train operations at the high-speed railway stations is hackled,the basic content and the interlocking relationship of computer interlocking system is introduced.The concept of train time-space operation chain is proposed.Using the time-space occupancy function,we can calculate the occupancy sequence of the train or train set accurately,and describe the whole process of a train running in a station more accurately.The time-space operation chain is the basis of the follow-up studies,such as the calculation of station effective carrying capacity,study on robustness improvement of operation plan based on operational chain optimization,coordination optimization of train set shunting.(2)Study on the calculation of effective carrying capacity of large high-speed railway passenger stations.The train level and the operation level candidate set is introduced,and a linear integer programming model is built based on the k L-list ?coloring problem.The real data of the high-speed yard of the Beijing South Railway Station is taken as an example,then,the problem is solved by the Cplex.Comparing with the results obtained from the heuristic algorithm,the results,obtained from our model solved by the Cplex,are of more quality and be solved more effectively.Besides calculating the carrying capacity,we obtained the corresponding operation plan,so the carrying capacity is effective.For different influencing factors,suggestions are put forward to strengthen the carrying capacity.(3)Describing the whole process of train operation at high-speed railway stations using the operational chain,the robustness improvement problem of the technical operation plan of high-speed railway stations is studied.Based on the timetable of a given station,without the change of train time and train order,the spatial and temporal resource sequences of all train operation chains are optimized,to reduce the interactions between trains and improve the robustness of the station operation plan.Using the time-space occupancy function,the process of release piecewise is well reflected,so the model has higher accuracy.An improved GRASP algorithm is designed to solve.The experimental results show that the improvement of basic GRASP algorithm increased the adaptability and the solving efficiency.The dely propagation situation before and after the optimization is analyzed.(4)Study on the coordination optimization of train set shunting at large high-speed railway passenger hub stations.An optimization model is built based on the time-space operation chain,and a space-time resolution algorithm is designed to coordination the train set shunting operations at large high-speed railway passenger hub stations.The real data of the Beijing South Railway Station is taken as an example,the feasibility of the model and algorithm is verified.Case study shows that,the space-time resolution algorithm can reduce the total waiting time on the track lines of the train sets that have shunting operations,on the premise that the technical operation plan is feasible and of no route conflicts.The utilization efficiency of the track lines and the train sets are both,improved.(5)A comprehensive optimization system for technical operation of high-speed railway station is developed based on the proposed theories and methods.Compared with other similar systems,the system has the advantages of easy deployment,network' collaboration,excellent user experience,high precision and high intelligence.