Effect of an Inter-Turn Short Circuit Fault on Performance of Different Control Techniques: Application to squirrel-cage induction machines

The aim of this paper is the study of the problems that can affect the operation of Induction Motor (IM) through failures, especially short-circuit faults between coils, to its impact on the control and operation of the motor. For this, we present a new method for the modeling of IM operating under short circuit fault between coils in the machine stator winding. This new method is based on the theory of electromagnetic coupling of electrical circuits. In this paper a comparative study between two most popular control approaches of IM: Direct Torque Control (DTC) and Backstepping Control. The two control strategies are compared in different terms such as their stability proprieties, torque and current fluctuations, taking into account the presence of the stator defects such as short-circuits between coils, the awaited goal is to evaluate the control is capable to improve the performance of the machine under faulty conditions. At last, the proposed two control strategies in this paper are verified by numerical simulation. The numerical validation results demonstrate that the proposed two control approaches have presented good performances of IM in faulty regime.