共中线开绕组电驱动系统单开关管开路故障诊断研究  

Study on Open Circuit Fault Diagnosis of a Single Switch in Dual Inverter Open-winding Drive With Common Mode Connected DC Buses

作　　者：杨淑英[1] 符焕 胡晓海 孙小晗 张兴[1] YANG Shuying;FU Huan;HU Xiaohai;SUN Xiaohan;ZHANG Xing(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui Province,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009

出　　处：《中国电机工程学报》2020年第21期7056-7064,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51877062)。

摘　　要：双逆变器开绕组电驱动拓扑方案,尤其是近年来提出的共中线设计方案,相比于单逆变器驱动系统而言具有较好的运行性能和较强的容错运行能力,是新能源汽车以及多源混合新能源汽车电驱动系统一种较为理想的拓扑方案。然而,拓扑的冗余运行特性也使其故障开关管的诊断较为困难。该文针对共中线开绕组驱动拓扑,在设计其零序电流和中点电位控制算法的基础上,提出一种基于受限单极性运行模式电流特征分析的单开关管开路故障诊断方法。该方法利用电流周期平均值特征实现故障相及"故障开关对"的定位之后,为进一步对开关对中发生开路故障的开关管进行辨识,将故障相所在的逆变桥工作于受限单极性运行模式下,从而使得同一"故障开关对"中两开关管具有不同的开路故障特征,为故障开关管的准确辨识提供了条件。最后,通过实验对所提故障诊断方案的有效性进行了验证。Compared with the single inverter drive, the dual-inverter open-end winding configuration especially that with common mode connected DC buses proposed recently, is a more ideal drive topology for new energy vehicles, particularly those powered with multi-sources, considering its merits of not only better operation performance, but also greater capability in switch fault tolerance. It is also the capability of fault tolerance, however, that results in difficulty in fault diagnosis. Referring to this open-end winding drive with common mode connected DC buses, the control scheme emphasizing on the zero-sequence control as well as the neutral point voltage control were designed in this paper, based on which a single-switch open circuit fault diagnosis technique was proposed by analyzing the features of the stator current in the presented unipolar operation mode. In this technique, both the faulty phase and the faulty switch pair were found out firstly through calculating the stator phase currents’ average values. Following that, to localize the specific faulty switch in the faulty switch pair, the bridge of the faulty phase was forced into a unipolar operation mode, in which different features can be identified to the two switches in the same faulty switch pair, allowing the specific faulty switch localized. At last, the validity of the proposed diagnosis technique was confirmed through experiments on a laboratory test rig.

关 键 词：共中线双逆变器驱动拓扑 开绕组电机 开关管开路故障 故障诊断 

分 类 号：TM346[电气工程—电机]