Abstract

A novel and real-time fault diagnosis method based on current data reconstruction for rectifiers is proposed in this article. The symmetry of a 3-phase pulse-width modulation rectifier’s topology can be used for fault diagnosis. The symmetry is broken when open-circuit faults happen, a similarity measurement algorithm based on current data reconstruction is used for fault detection. Fault characteristics for current lists and multi-scale entropy are proposed to locate different kinds of faults. The proposed diagnostic method doesn’t need additional hardware devices and costs low. It is convenient to be embedded in an existing control system as a subprogram without significant adjustments. The experimental results show the effectiveness of the proposed diagnostic method for both single and multiple open-circuit faults.

摘要

本文提出了一种基于电流数据重构的整流器实时故障诊断方法。三相脉宽调制整流器拓扑的对称性可用于故障诊断。开路故障发生时对称性被打破，采用基于电流数据重构的相似度度量算法进行故障检测。提出了当前列表的故障特征和多尺度熵来定位不同类型的故障。所提出的诊断方法不需要额外的硬件设备并且成本低。可以方便地作为子程序嵌入到现有的控制系统中，无需进行重大调整。实验结果表明了所提出的诊断方法对单个和多个开路故障的有效性。