A Novel Fault-Tolerant Control Method for Field-oriented Control of Induction Motor using Matrix Converter

This paper presents a new control method for matrix converter which has been used in the field oriented control of a three-phase induction motor. The main feature of the proposed method is its fault-tolerant capability when one of the phases of induction motor becomes opened. If for any reason one of the phases of induction motor becomes opened the current of the same phase will become zero resulting in unbalanced air gap flux. This problem results in a swing on developed torque, reduction in average torque, increased losses and extra mechanical noise of the motor. For solving these problems the currents of the remaining two phases must vary according to a relation in a way that the flux path returns to a situation which the motor had before the fault. The introduced control method is based on a combination of space vector modulation (SVM) and hysteresis band. Control relationships of matrix converter's switches extract from a combination of control relationship of rectifier and inverter's switches. Computer simulations carried out in MATLAB Simulink environment validates the effectiveness of this method in controlling the 3-phase motor in situations that one of the phases is opened.