基于Simulink的ZPW-2000型多段轨道电路仿真设计

Simulation Design of ZPW-2000 Multi-section Track Circuit Based on Simulink

ZPW-2000型移频轨道电路是铁路信号系统的重要基础设备。为分析轨道电路区段间相互关系和调谐区故障对两侧区段的影响,根据ZPW-2000型移频轨道电路的数学模型,采用Simulink仿真工具设计轨道电路各模块的仿真模型,根据该种轨道电路的构成原理和多段轨道电路间的衔接关系,构建ZPW-2000型多段轨道电路仿真模型。仿真分析轨道电路处于调整状态和分路状态时连续多段轨道电路中移频信号的收发传送过程,移频信号在传送过程的变化特征与实际信号一致,验证了仿真模型的有效性和准确性。模拟分析调谐单元发生引接线脱落、电容失效和断轨等典型现场故障时,相邻区段移频信号的变化特征及其对调谐区电气隔离作用的影响,通过信号异常变化可推断故障类型和位置。该仿真模型可为铁路现场的维护、调试和故障诊断提供技术支持。

ZPW-2000 frequency-shift track circuit is an important basic equipment of railway signal system.In order to analyze the relationship between track circuit sections and the influence of tuning zone faults on sections on both sides,the simulation model of each module of track circuit is designed by Simulink simulation according to the mathematical model of ZPW-2000 frequency shift track circuit.The simulation model of ZPW-2000 multi-segment track circuit is constructed according to the composition principle of this track circuit and the correlation between multi-segment track circuits.The transmission process of the frequency shift signal in the continuous multi-segment track circuit is simulated and analyzed when the track circuit is in the adjustment state and the shunt state.The change characteristics of the frequency shift signal in the transmission process are consistent with the actual signal,and the validity and accuracy of the simulation model are verified.The change characteristics of frequency shift signal in adjacent sections and its influence on the electrical isolation of the tuning area are simulated and analyzed when typical on-site faults,such as lead wire shedding,capacitor failure and rail breaking,occur in the tuning unit.The fault type and location can be deduced by abnormal signal changes.The simulation model can provide technical support for the maintenance,debugging and fault diagnosis of railway field.