牵引供电系统故障的基于模型诊断方法研究

摘要

针对现有专家系统在牵引供电系统故障诊断中的不足，提出将基于模型诊断(MBD：Model-based Diag-nosis)方法应用于牵引供电系统的故障诊断中。用基于模型的方法对接触网、正馈线、母线等牵引供电系统各个组成部分建立以电压、电流量为变量的两层抽象模型。以京津城际永乐段仿真故障为例，详细描述了诊断过程中最小冲突集识别、诊断候选获取以及故障匹配等关键步骤的实现方法，其诊断结果表明基于模型诊断方法能快速诊断出系统故障。同时提出一种测量装置故障时的解决方法，实验结果表明当测量装置故障导致测量数据错误时，诊断系统仍能快速诊断出系统故障。%To deal with the disadvantages of existing expert systems in the diagnosis of faults of traction power supply systems,a method of model-based diagnosis was applied to the fault diagnosis of traction power supply systems.For each part of the traction power supply system,such as catenary,positive feeder and buses,the model-based method was used to build a two-layer abstract model with voltages and currents as variables.The fault simulation of Yongle Section in Beijing-Tianjin Intercity Railway was used to describe the methods to real-ize the key steps in the diagnosis process,such as the recognition of the minimal conflict sets,the acquisition of the fault diagnosis candidates and the fault matching.The diagnosis results showed that the model-based meth-od can diagnose system faults quickly and accurately.Meanwhile a strategy was proposed to avoid the influence caused by the measurement device failure.The experimental results showed that the diagnosis system with the proposed strategy can still diagnose the system fault quickly when the failure of the measurement device causes the error of the measuring data.