A direct torque control scheme for dual inverter fed induction motor drive with a common DC voltage source

2017 ◽  
Author(s):  
K. I. Nirsha ◽  
P. P. Rajeevan
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Voltage Source ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Dc Voltage ◽  
Control Scheme

Simple Threshold Method in Fault Diagnosis for Voltage Source Inverter in a Direct Torque Control Induction Motor Drive

2019 ◽  
Vol 13 ◽  
Author(s):  
Farid Kadri ◽  
Mohamed Assaad Hamida
Keyword(s):  
Fault Diagnosis ◽  
Induction Motor ◽  
Direct Torque Control ◽  
Classification Performance ◽  
Torque Control ◽  
Fault Classification ◽  
Voltage Source ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Voltage Source Inverter

Background: The need for a diagnosis today, becomes a necessity for variable speed AC drives in several industrial applications. An important research axis is oriented towards monitoring the state of the converter supplying the electric motor. Indeed, the voltage source inverter is likely to have switching faults. Therefore, an emergency stop of the motor drive must be done. Objective: After reviewing related patents and works, the objective of this paper is to identify the feasibility of fault detection and diagnosis in a three-phase inverter feeding an induction motor. Methods: The proposed approach is a simple threshold fault classification method applied to fault diagnosis of a direct torque control (DTC) induction motor drive using the stator Concordia mean current vector. With a fault occurrence, a localization domain consisting of seven patterns is constructed. Results: Simulated results on 1.5-kW induction motor drive show the effectiveness of the proposed approach with a good classification performance. Conclusion: The classification performance of our simple diagnosis system is acceptable for one fault occurrence compared to others methods. Faulty switch detection and identification is completed within a few periods of current. Using intelligent technique should improve classification performances for multiple faults occurrence.

Neural Direct Torque Control for Induction Motor under Voltage Source Inverter Open Switch Fault

2020 ◽  
Vol 13 (4) ◽  
pp. 571-579 ◽  
Author(s):  
Farid Kadri ◽  
Mohamed A. Hamida
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Open Circuit ◽  
Drive System ◽  
Torque Control ◽  
Voltage Source ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Voltage Source Inverter ◽  
Open Switch

Background: The study of induction motor behavior during abnormal conditions due to the presence of faults and the possibility to diagnose these abnormal conditions has been a challenging topic for many electrical machine researchers. Objective: Direct Torque Control (DTC) is applied to the control of an induction motor in healthy and an open circuit fault in the PWM three phase voltage fed inverter. Neural DTC is developed and used to improve the dynamic behavior of the drive system under faulty switch occurrence. Methods: The validity of the proposed control scheme is tested under normal conditions and switching fail in the Voltage Source Inverter (VSI) caused by an open circuit. Through a simulation testing of an induction motor drive system at different speed references, a comparison between basic DTC and Neural DTC is performed. Results: Simulated results on 1.5-kW induction motor drive show the performance of the proposed control in normal and faulty cases. The stator current, flux, torque, and speed at different references are determined and compared in the above techniques using MATLAB-SIMULINK. Conclusion: A Neural Network (NN) DTC control system under an open switch fault is proposed without the need for classical switching table. The use of hybrid intelligent techniques aims to improve the DTC performances in case of multiple faults occurrence.

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