四种电力机车主变流器的故障诊断方法及仿真对比

Comparison of Fault Diagnosis Method and Simulation of Four Main Converter of Electric Locomotive

我国铁路运输事业正在高速发展,机车的可靠安全运行对于铁路安全生产运输至关重要。对电力机车主变流器进行及时故障诊断可有效预防和减少铁路运输事故的发生。选取韶山8型(SS8)电力机车的主变流器作为研究对象,在MATLAB软件的Simulink环境下构建SS8型电力机车主变流器的仿真系统,模拟不同故障类型的运行模式,仿真得到相应的输出电压波形;分别利用小波变换、压缩感知方法处理输出电压数据,提取故障特征,构建故障特征向量;最后分别利用BP神经网络的方法对故障特征向量进行类别划分和利用支持向量机(SVM)工具箱构建多故障分类器,进行主变流器故障分类,从而实现故障诊断。

With the rapid development of China＇s railway transportation, the safe and reliable operation of locomo tives is becoming particularly important for railway safety. The timely fault diagnosis of the main converter of electric locomotives can effectively prevent or reduce the occurrence of railway accidents. In this paper, the main converter of SS8 electric locomotive was investigated and the operation with different fault types were simulated by es tablishing the simulation system of SS8 electric locomotive in Simulink of MATLAB. The output voltage data obtained from the simulation were processed by wavelet transform and compression sensing respectively to extract the fault features and construct the fault eigenvector. The fault diagnosis was finally achieved by categorizing the fault eigenvector with back propagation （BP） neural network and by building a multi fault categorizer to classify the faults of main electric converter with support vector machine （SVM）.