Fault detection in multi-phase two-level inverters using Cauchy distribution of normalized phase currents

In this paper, a novel detection algorithm for open switch fault detection is presented; fault signals are utilized to implement fault tolerant control of a five phase PMSM drive. According to the presented method, output currents of the power converter are normalized with a simple method, and then using current average value an appropriate detection index is obtained. The proposed idea is fast, simple, and robust against false alarms. It is also capable of detecting multiple open switch faults. Theory is explained; simulation results are demonstrated for different faulty modes in Matlab. Finally, simulation results of a five phase PMSM drive equipped with fault detection method with closed loop control are presented to show its effectiveness.