Rotor position sensor fault detection Isolation and Reconfiguration of a Doubly Fed Induction Machine control

In this paper, a Doubly Fed Induction Machine (DFIM) operating in motor mode and supplied by two Voltage Source Inverters (VSI), in stator and rotor sides, is presented. The aim is to analyze the position sensor fault effects on a Direct Torque Control (DTC) of the DFIM. This justifies the necessity of a reconfiguration control when a position sensor fault appears in order to avoid an interruption in system operations. In the other hand, this study emphasizes the close dependency between system performance and the output accuracy of the rotor position sensor. Moreover, simulation results point out the operation system deterioration in case of position sensor fault, which leads in most cases to its shut down in contrast to industrial expectations. This work presents a control reconfiguration for a DFIM speed drive when a position sensor fault occurs, in order to ensure system service continuity. For this purpose, SABER simulation results illustrate the system behavior before and after a position sensor fault. System performance preservation is carried out after control reconfiguration. The proposed solution is relevant especially due to its simplicity.