Abstract
This paper deals with fault-tolerant control (FTC) of an induction motor (IM) drive. An inter-turn short circuit (ITSC) of the stator windings was taken into consideration, which is one of the most common internal faults of induction machines. The sensitivity of the classic, well-known voltage and current models to the stator winding faults was analyzed. It has been shown that these classical state variable estimators are sensitive to induction motor parameter changes during stator winding failure, which results in unstable operation of the direct field-oriented control (DFOC) drive. From a safety-critical applications point of view, it is vital to guarantee stable operation of the drive even during faults of the machine. Therefore, a new FTC system has been proposed, which consists of new modified rotor flux estimators, robust to stator winding faults. A detailed description of the proposed system is presented herein, as well as the results of simulation and experimental tests. Simulation analyses were performed using MATLAB/Simulink software. Experimental tests were carried out on the experimental test bench with a dSpace DS1103 card. The proposed solution could be applied as an alternative rotor flux estimation technique for the modern FTC drive.
Highlights
Vector methods enable precise regulation of the electromagnetic torque or/and angular speed of induction machines; they are utilized in many practical applications [1,2]
This paper was concerned with fault-tolerant control of the induction motor during internal faults of the induction machines
An inter-turn short circuit of stator windings was are inevitable in experiments
Summary
Vector methods enable precise regulation of the electromagnetic torque or/and angular speed of induction machines; they are utilized in many practical applications [1,2]. In Reference [42], a modified stator winding resistance estimator based on an artificial neural network (ANN) was applied to counteract the negative effects of the ITSC in the DTC-ST scheme Another interesting technique which can be used at a later stage of fault counteraction is related to a control scheme with switched controllers, proposed in Reference [43] for sensor-fault-tolerant drives. A comprehensive state of the art review about FTC systems for stator winding faults of induction machines; Detailed analysis of the impact of an ITSC on the accuracy of IM rotor flux estimation by open-loop estimators (analytical substantiation included); Analysis of an impact of an ITSC on the performance of a closed-loop control scheme (DFOC).
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