High Speed Railway Capacity Research Of Different CTCS Levels Based On UIC406 Method

High-speed railway capacity is an important indicator to measure the satisfaction of public transportation services.CTCS-2 and CTCS-3 train operation control systems are key technologies to improve capacity and ensure the safe operation of high-speed railways.Therefore,it is of great significance to study the analysis methods of high-speed railway capabilities under different CTCS levels.Nowadays,block time window compression method is widely used for capacity analysis,which is most to analyze buffer time.But the capacity evaluation of different ETCS levels has reference significance for CTCS.In the existing research of domestic high-speed railways based on UIC406,most from the operational point of view,the analysis of the impact of signal system design on capacity is rarely analyzed.In addition,through investigation,the domestic design department still uses the main line railway’s method based on the traction calculation software to calculate the line and station capacity separately,and does not consider the signal system model and work processes,resulting in excessive deviation between the actual capacity and the theoretical capacity.The operation department only plans the schedule timetable based on the bottleneck value of provided by the design department,and there is little reference information.Therefore,based on UIC406,this paper considers the signal system model and its response time,and puts forward a method for the integrated capacity analysis of high-speed railway section-stations under CTCS-2 and CTCS-3 levels.First of all,this method proposes the principle of division of multi-side station operation sections for the problem of blocking time window compression not mentioned in UIC406,and establishes the blocking time models of different section types and different operation scenarios under the CTCS-2 and CTCS-3.These models comprehensively consider the signal system model,the workflow between the subsystems,the reaction time of the signal equipment,and the human-machine interaction time in actual operations.The Max-plus Automata model is introduced for capacity calculation due to the discontinuous occupancy characteristics.Secondly,this method proposes an analysis model for the integration capacity of high-speed railway bottlenecks and section-station.This method analyzes the possible bottlenecks(stations and posts)of the whole line from two indicators.One is the most unfavorable headway and the other one is the most unfavorable average minimum headway.So as to determine the bottleneck value of the entire line and output the most unfavorable route occupancy plans and the corresponding most unfavorable models.(2)This method integrates analysis of sections and stations,and uses compression and conflict detection algorithms based on the blocking time window to obtain the most unfavorable section-station integrated operation plan,which provides a complete information reference for the operation of the preparation of the plan and operation map.Finally,taking the Beijing-Shanghai high-speed railway Beijing-Jinan West section as an example,the paper uses the above method to analyze the capacity of possible bottlenecks under CTCS-2 and CTCS-3,and verifies that Beijing South Railway Station is the bottleneck of the whole line and the departure capacity is basically consistent with the actual situation.This paper further analyzes the integration capacity of the section CTCS-3-station CTCS-2,and compares it with the actual timetable to verify the adaptability of this method,and then analyzes the section CTCS-3-station CTCS-2 to compare the impact of different CTCS levels on the ability.In summary,this method can accurately locate the bottleneck of the whole line,and scientifically and accurately assess the design capacity.Then,the integrated sectionstation plan,which provides powerful data for the subsequent planning operation chart compilation Basis,can visually see the capacity margin of the bottleneck and each section.At the same time,using this method,the operation margin model is added to the block time model of each zone,and a more scientific and accurate plan operation chart can be formed according to different plan needs.