Current Sensors Fault Detection and Tolerant Control for Induction Motor Drive

In this paper current sensor fault tolerant control for direct rotor flux oriented induction motor drive has been presented. The simulation tests have been carried out when A-phase or/and B-phase sensors have failed. The solution proposes the use of the Virtual Current Sensor (VCS) algorithm based on the direct current (DC) voltage and the rotor angular velocity, which is reconstructing the values of the stator phase currents in a stationary reference frame (α-β). A simple algorithm for detecting and locating current sensor fault has been proposed. Simulation studies under different operating conditions of the drive showed high efficiency of the presented method.