Study On Route Allocation Optimization Of High-speed Railway Station

Train tracking interval is one of the main factors affecting the carrying capacity of highspeed railway.Under the condition that the track circuit is unlocked in sections,the optimization of the train route allocation is helpful to compress the arrival interval time and improve the carrying capacity of during the rush hour.Based on the introduction of the types and basic layout of high-speed railway stations,this paper analyzes the technical operation process of five types of trains at the station,such as the originating train,arrival train,stop through train,non-stop through train and reentry train.This paper also lists some time standards of the arrival-departure track and throat area occupation and the relationship between them is analyzed.According to CTC dispatching centralized system,the paper analyzes the connection relationship of route occupation in time and the scene of route conflict under the condition that the track circuit is unlocked in sections and in the scene of dense arrival and departure of trains,and puts forward the method of solving route conflict.In addition,the concept of train tracking interval and its traditional computation method are introduced.Under the condition that the track circuit is unlocked in sections,the influence of route allocation on train tracking interval is analyzed and the computation method of train tracking interval is proposed.It is concluded that the closer the end of the overlapping section of receiving routes between front and rear trains is to the outside of the station,the less the arrival interval.The arrival interval of high-speed railway is the bottleneck to limit train tracking interval.Under the condition that the track circuit is unlocked in sections and in the scene of dense arrival and departure of trains,a route allocation model of high-speed railway based is established.The optimization objective is to minimize the sum of one-way arrival intervals,and the uniqueness,integrity of track and route occupation,the safety interval of the track utilization,train tracking interval,route conflict resolution are taken as constraints.Taking the trains of Fuzhou South Railway Station as an example,the current optimal solution with a gap tolerance of 4.34% relative to MIP is obtained by CPLEX.Through the analysis of the solution,the global optimality of the solution and the validity of the constraint are verified.Theoretical arrival interval of Fuzhou South Railway Station in the down direction is 3min31 s.Under the condition that the track circuit is unlocked in sections,the minimum of the arrival interval is3min08 s.The minimum value of the objective function is 5766 s,i.e.1h36min06 s,the average arrival interval is 3min20 s,and the average compression is 11 s.The model can achieve the optimization goal of minimizing the sum of arrival direction interval time,allocate reasonable arrival departure track and route for the train.The route conflict is solved,and the validity of the model is verified.This model has a certain guiding significance for the compression of train interval time and the compilation of train diagram.