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A Method for Fault Detection and Isolation based on the Processing of Multiple Diagnostic Indices: Application to Inverter Faults in AC Drives

机译：基于多个诊断指标的故障检测与隔离方法：在交流变频器逆变器故障中的应用

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摘要

A general method for fault detection and isolation is proposed and applied to inverter faults in drives of electric vehicles. This method is based on a change-detection algorithm, which allows multiple fault indices to be combined for retrieving the most likely state of the drive. The drive topology under study is a six-leg inverter associated with a three-phase open-end winding machine. Due to the inherent fault-tolerant topology, the conventional fault indices are no longer effective. Therefore, an analysis of simulations in faulty conditions leads to the derivation of suitable fault indices. These are based on the envelope of the phase currents as well as their instantaneous frequency. Specific operating conditions related to the electric vehicle environment are taken into account, such as the flux-weakening region and energy recovery. In these modes of operation, fault detection and isolation can be affected by uncontrolled currents circulating through the free-wheeling diodes. Finally, the performances of the fault detection and isolation scheme are evaluated under steady state and non-stationary conditions through simulations and experimental results.
机译：提出了一种故障检测与隔离的通用方法，并将其应用于电动汽车变频器中的逆变器故障。此方法基于更改检测算法，该算法允许组合多个故障索引以检索驱动器最可能的状态。研究的驱动拓扑是与三相开放式绕组机关联的六臂逆变器。由于固有的容错拓扑，常规故障索引不再有效。因此，对故障条件下的仿真进行分析可以得出合适的故障指标。这些基于相电流的包络及其瞬时频率。考虑到与电动汽车环境相关的特定运行条件，例如弱磁通量区域和能量回收。在这些工作模式下，故障检测和隔离会受到流经续流二极管的不受控制的电流的影响。最后，通过仿真和实验结果评估了故障检测和隔离方案在稳态和非平稳条件下的性能。

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