基于故障传播与因果关系的故障溯源方法及其在牵引传动控制系统中的应用

针对故障溯源问题,提出一种基于故障传播与因果关系的故障溯源方法.该方法首先建立体现时空特性的系统故障传播模型;其次利用Granger因果关系技术判定不同观测点信号间的因果关系,确定适合提取信号故障特征用于故障诊断的观测点;然后提取系统运行时这些观测点故障特征和故障传播时间;最后同故障传播模型中对应观测点的时空特性相匹配,从而确定故障类型与位置,实现故障溯源.所提方法在高速列车牵引传动控制系统半实物仿真平台上进行了实验验证,结果表明该方法可行有效.

Fault Tracing Method Based on Fault Propagation and Causality With Its Application to the Traction Drive Control System

To solve the problem of fault tracing, a fault tracing method based on fault propagation and causality is proposed in this paper. Firstly, the fault propagation model of the system, which reflects spatiotemporal characteristics, is established. Secondly, the Granger causality technique is used to determine the causality between signals of different observation points, and to determine the observation points suitable for extracting fault features for fault diagnosis. Thirdly, the fault features and fault propagation time of these observation points are extracted, and then compared with the spatiotemporal characteristics of the corresponding observation points in the fault propagation model to determine the fault type and location. The proposed method is verified by the semi-physical simulation platform of the traction drive control system of high-speed train, and the feasibility and efficacy of this method is verified.