Current Sensor Fault-Tolerant Induction Motor Drive with Online Rotor Resistance Adaptation

In this article, the current sensor (CS) fault-tolerant control (FTC) strategy for the induction motor (1M) drive has been presented. In CS postfault operation, missing phase currents are changing to currents estimated by the Virtual Current Sensor (VeS) algorithm, which is based on the DC-link voltage of voltage source inverter (VSI) and the rotor angular velocity. The paper presents the possibility of improving the accuracy of the stator current estimation using the method based on neural network (NN) for online estimation of the rotor resistance. The wide simulation tests for variable rotor and stator resistances in the 1M model during sudden open- circuit fault of CS in phase A or B show the high quality of the proposed solution.