电工技术学报2017，Vol.32Issue(z2)：87-95,9.DOI:10.19595/j.cnki.1000-6753.tces.L70206
基于输出电流轨迹的机车逆变器开路故障在线诊断方法
An Online Diagnostic Method Based on Output Current Locus for Open-Circuit Faults of Inverters
摘要
Abstract
Considering the special situation of locomotive inverters, an online diagnostic method for open-circuit faults of inverters is proposed to ensure the traffic safety, and improve the maintenance efficiency. Assuming that two output currents have equivalent magnitudes, the locus of these two currents is proved to be an ellipse by restrict mathematic inference. The obliquity and the centrifugal rate of the ellipse are independent of the current amplitude, while the size of the ellipse is proportional to the current amplitude. Through the theoretical analysis, it is found that any single switch open-circuit fault or double switches open-circuit fault corresponds to a unique locus characteristic. By observing or identifying the locus, fault can be isolated accurately. It is certified that load variation will not affect the method. Finally, the accuracy of the mathematical model and the validity of the online diagnosis method are verified by the dSPACE platform.关键词
故障诊断/故障隔离/开路故障/逆变器/输出电流Key words
Fault diagnosis/fault isolation/open-circuit fault/inverter/output current分类
信息技术与安全科学引用本文复制引用
伍珣,陈特放,成庶,田睿,仝力..基于输出电流轨迹的机车逆变器开路故障在线诊断方法[J].电工技术学报,2017,32(z2):87-95,9.基金项目
国家自然科学基金(61273158)和国家重点研发计划(2016YFB1200401)资助项目. （61273158）
