Inverter fault diagnosis of an electrical series‐connected two sinusoidal six‐phase permanent magnet machines drive

Abstract

This paper investigates a real-time fault diagnostic of a transportation system which needs two drives with faulttolerance capabilities. Because of constraints on the mass of the system and on the cost of the Voltage Source Inverter (VSI), a drive with two Six-Phase Permanent Magnet Synchronous Machines (PMSM) in series-connection supplied by two six-leg inverters is chosen. Despite the serial -connection, independent control of the two machines and fault -tolerance to openswitch fault is ensured. Nevertheless, a Fault Detection Identification (FDI) process is required for analysis and/or control reconfiguration. The proposed FDI is based on the combination of different criteria obtained from the two zero-sequence currents and from the normalized currents mapped into two frames defined by the Concordia Transformation. Results obtained from simulation and experimental tests show the effectiveness of the proposal.

Virtual current vector‐based method for inverter open‐switch and open‐phase fault diagnosis in multiphase permanent magnet synchronous motor drives

“…Substituting Equation (27) into Equation ( 15) and taking into account Equations ( 22) and (23) gives the expression of the variables D n in normal operation mode:…”

“…However, when an open-phase fault occurs in the VSI, i ZSCC coincides with VCV n . Taking this into account and considering Equations ( 22) and (23), D n will converge to +1. The fault occurrence is judged when D n crosses a fixed threshold T op .…”

“…There are many instructive papers that have addressed the problem of real-time detection and identification of these faults. The proposed fault detection and identification (FDI) processes in the literature include real-time estimation-based models [15][16][17][18][19], current signals-based methods [20][21][22][23], or voltage signals-based methods [24][25][26]. These strategies are well known and references [8,27] give a more comprehensive bibliography, especially for the classical three-phase electric drives.…”