ZPW2000A jointless track circuit system modeling and simulation considering adjacent signal interference

Track circuit is a crucial part of the train control system. It is of great significance to establish a refined track circuit model for fault diagnosis, which is important for ensuring the train´s safety. However, the adjacent track circuit signal interferences are not considered in all pre-existing track circuit models, leading to inaccurate simulation in the fault state. In order to overcome such a defect, this paper firstly develops a component-level frequency-dependent two-port network model, then computes module-level frequency-dependent two-port network model according to the cascade type, and deduces T cascaded two-port network model. Based on the above, the track circuit system model considering the adjacent track circuit signal interference is established. Finally, interferences between adjacent track circuits are analyzed in normal and fault state. The simulation experiment results reveal that the presented model is of high enough accuracy, which satisfies the requirement of track circuit fault diagnosis.