Voltage Inverter Fed Induction Motor Research Articles

Detection of Two-Level Inverter Open-Circuit Fault Using a Combined DWT-NN Approach

Three-phase static converters with voltage structure are widely used in many industrial systems. In order to prevent the propagation of the fault to other components of the system and ensure continuity of service in the event of a failure of the converter, efficient and rapid methods of detection and localization must be implemented. This paper work addresses a diagnostic technique based on the discrete wavelet transform (DWT) algorithm and the approach of neural network (NN), for the detection of an inverter IGBT open-circuit switch fault. To illustrate the merits of the technique and validate the results, experimental tests are conducted using a built voltage inverter fed induction motor. The inverter is controlled by the SVM control strategy.

A comparative study between methods of detection and localisation of open-circuit faults in a three phase voltage inverter fed induction motor

The present paper focuses on the techniques of detection and localisation of opencircuit faults in a three phase voltage source inverter fed induction motor. First, the paper starts by presenting the impact of an inverter IGBT open-circuit fault on the induction machine performance. A comparative study is then carried out between three different detection techniques: the mean value of the currents method, the measurement of the current drop method and the Park's vectors method. The comparison is to assess each technique in terms of its performance, that is the time detection rapidity and localisation ability, as well as in terms of hardware, that is the number of current sensors required for IGBT open-circuit fault detection. To validate these methods, a test-rig is developed in our diagnostic group laboratory which consists of the realisation of a two-level voltage source inverter controlled by a DSPACE-1104 card to generate the PWM vector control for the induction motor. The obtained simulation and experimental results illustrate well the detection effectiveness of each technique as well as the comparison study merits.

A comparative study between methods of detection and localisation of open-circuit faults in a three phase voltage inverter fed induction motor

The present paper focuses on the techniques of detection and localisation of opencircuit faults in a three phase voltage source inverter fed induction motor. First, the paper starts by presenting the impact of an inverter IGBT open-circuit fault on the induction machine performance. A comparative study is then carried out between three different detection techniques: the mean value of the currents method, the measurement of the current drop method and the Park's vectors method. The comparison is to assess each technique in terms of its performance, that is the time detection rapidity and localisation ability, as well as in terms of hardware, that is the number of current sensors required for IGBT open-circuit fault detection. To validate these methods, a test-rig is developed in our diagnostic group laboratory which consists of the realisation of a two-level voltage source inverter controlled by a DSPACE-1104 card to generate the PWM vector control for the induction motor. The obtained simulation and experimental results illustrate well the detection effectiveness of each technique as well as the comparison study merits.

Detection of Open-Circuit Fault in a Three-Phase Voltage Inverter Fed Induction Motor

In this paper the detection and localization of the open-circuit switch of an inverter fed induction motor is investigated. The fault detection technique used in this work is based essentially upon the calculation of the mean value of the stator currents by employing two different approaches: the Park’s d-q stator currents approach and the three-phase stator currents approach. The inverter switch fault is localized by knowing the fault angles derived from the mean value of the d-q currents for the first approach or by directly comparing the mean value of the three- phase currents with respect to a known value of the threshold for the second approach. The work is first carried out using simulation work and then all obtained simulation results are validated by experimental work. A comparative study based on the results is then presented to show the effectiveness and merits of the two approaches.

Stator windings condition diagnosis of voltage inverter-fed induction motor in open and closed-loop control structures

AbstractThis paper deals with detection of the stator windings shorted turns in an induction motor drive working under open (scalar) and closed loop (Direct Field Oriented DFO) control structures. In order to detect the early stage of stator winding fault, the analysis of symmetrical and principal components of stator voltages and currents is used. Experimental results obtained from a specially prepared induction motor are presented.