Research On Optimization Of Platform Schedule For Transfer Convenience In Big High-speed Railway Station

Large high-speed railway stations are important nodes for passenger transfer on the highspeed railway network.Their technical operation level and passenger service quality are not only critical to the performance of the high-speed railway network,but also affect the competitiveness of railways in the transportation service market.The transportation mode of“cross-line train direct transportation” adopted by China’s high-speed railway is no longer suitable well for the situation that the railway network structure tends to be complex and the passenger flow is steadily increasing.Organizing passengers to transfer in large high-speed railway stations is more conducive to the release of railway network capacity.However,large high-speed railway stations have a large number of fixed arrival-departure tracks and platforms,which means that passengers cannot easily transfer within the station.Therefore,based on the comprehensive optimization of routes in the throat area and arrival-departure tracks,this thesis studies how to improve the convenience of passengers transferring in large high-speed railway stations,mainly including the following contents:(1)Analysis of the technical operation process of large high-speed railway stations and conflict resolution.This thesis expounds the characteristics and principles of technical operations in large high-speed railway stations,analyzes the technical operation process and corresponding operation time of different types of trains in large high-speed railway stations,and generates a set of passing paths for trains to complete various technical operations and pass through the station.Divide the trains into passing trains and the other trains,analyze the conflict of the train occupancy to the arrival-departure tracks and the throat routes from the two dimensions of space and time,and use the safety interval time to resolute the arrivaldeparture tracks occupation conflict,and use the 4 kinds of “degree of conflict” to resolute the throat routes conflict.(2)Transfer within large high-speed railway stations.Based on the analysis of the characteristics of transfers in large high-speed railway stations,three transfer methods are given,which are suitable for passengers to transfer in large high-speed railway stations:transferring on the same side of one platform,transferring on the different sides of one platform and transferring in a short distance through station hall.And transferring in a short distance through station hall is further subdivided into 6 transfer methods that are more compatible with the transfer time and travel distance of passengers.The definition and measurement method of passenger transfer convenience within stations are given.On this basis,the concept of transfer-connection train path pairs is introduced,and their sets corresponding to the three transfer methods of passengers within large high-speed railway stations are generated.(3)Construct an optimization model for large high-speed railway stations’ arrivaldeparture tracks utilization to improve the passengers’ transfer convenience within station.The method for generating the weights of each transfer-connection train pair is given.Based on the generated train available station passing path set and transfer-connection train path pair set,with the goal of maximizing the number of transfer-connection train pairs belonging to the three transfer methods,considering the technical operation conflict constraints of trains in the station,transfer trains constraints and the change degree of the original arrival-departure tracks utilization schedule constraints,a multi-objective mixed integer linear programming model is established.On the premise that the train schedule is fixed,the conflict constraint of the model is improved based on the route conflict graph and the maximal clique.(4)Using the real example of Zhengzhoudong Railway Station,call the commercial solver CPLEX to solve the basic model and improved model constructed in this thesis,and verify its effectiveness and operability.The experimental results show that: after the model improved based on the route conflict graph and the maximal clique,the number of model constraints can be reduced by 97.0%,the number of variables can be reduced by 71.5%,and the solution time can be reduced by an average of 62.4%;based on the relevant assumptions of the thesis,when the original arrival-departure tracks utilization schedule is allowed to change by 40%,the obtained optimization schedule can ensure that the number of transferconnection train path pairs belonging to transferring in a short distance through station hall is at a high level,and the number of transfer-connection train path pairs belonging to transferring on the different sides of one platform increases by 950%.It can be seen that the model constructed in this thesis can improve the convenience of passengers transferring within large high-speed railway stations while taking into account the interests of the station,which is effective and operable.