Research And Deaign Of Simulationt Text System Of Zone Controller Of Urban Rail Transit

With the increase of people’s travel frequency and the improvement of operation efficiency of urban rail transit,the safety of metro has been paid more and more attention.As an automatic train supervision system,ATS is responsible for monitoring train operation and ensuring the safety of train operation.Zone controller is the key to safety protection of train,and it realizes safety protection through moving block.Moving block mode can shorten the train running interval and increase the traffic density of lines,so as to improve the metro operation efficiency.The main function of the zone controller is calculating movement authority for the trains within jurisdiction,the vehicle on-board equipment generates braking curve according to the movement authority and controls operation according to the braking curve.In this thesis,the simulation test environment of zone controller is set up,and the calculation of trains’ movement authority in the normal operation scenario and the abnormal operation scenario is completed.The simulation test environment is based on the station map,by analyzing the shortcomings of the undirected graph and the adjacency list,this thesis proposes a station map model,which manages the line topology data and signal equipment data separately and associates both through the mapping relationship table,based on directed graph and cross-linked list,this model achieves the goal that controls signal devices by directed graph.On the other hand,the other data of zone controller is divided into various classes according to functions and uses,and the attributes of each class are designed to describe the devices and the functional objects.On the basis of completing data management,the function of the zone controller is analyzed in this thesis,and the functional principles of train management,temporary speed limit management,movement authority,and boundary management are described in detail.Movement authorization is the main function of ZC,the premise of calculating movement authority is that the authorized path has been confirmed,and ZC determines the authorization path by searching the path based on the route information.In this thesis,Dijkstra algorithm,a classical method for solving the single source shortest path in positive weight network,is used to search the authorized path.This thesis adopts improved Dijkstra algorithm and an example is given to illustrate the process of determining the authorization path in detail,and then calculate movement authority.Then this thesis analyzes the influence of abnormal operation scenarios such as train blocking and platform fire on ZC,and the measures that ZC should take.Finally,according to function classification,the design of ZC function under normal operation scenario and abnormal operation scenario is completed.This design is based on the VS2019 platform and uses the C# language to complete the simulation test of the zone controller.By observing and analyzing the experimental results,it is confirmed that the zone controller simulation test environment can effectively handle movement authority in different operating scenarios.The zone controller’s handling of two abnormal operation situations,train blocking and platform fire,makes the function of ZC expand from the traditional movement authority to the processing of the overall operation scenarios of urban rail transit and lays the foundation for integration of ATS and ISCS.