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The present paper is intended for the detection and diagnosis of open-circuit faults in a three phase voltage inverter fed induction motor. Two techniques are being presented and used in order to achieve the open-circuit faults detection and localization. The paper concludes with a comparison between both these two techniques supported by some simulation and experimental results in order to illustrate...
Direct torque control (DTC) scheme is quite popular in a voltage source inverter fed induction motor (IM) drive. Considering a switching table based algorithm, the flux and torque are directly controlled by applied inverter voltage vectors. There is a direct relation between stator flux and applied inverter voltage vector, which is eventually the stator voltage vector. However, in a current source...
This paper proposed a new approach to detect and isolate the faults of FET in induction motor inverter based on EKF(Extended Kalman Filter). The main idea of this paper is that by estimating the variations of on resistance, we can detect fault of FET of motor inverter. In this paper, the induction motor inverter is considered. A model of induction machine driver which include the on resistance of...
In this paper, a new three-phase hybrid seven level inverter topology with a single DC supply is proposed for the first time. The proposed inverter is realized by cascading two three level flying capacitor inverters with a half bridge module. The inverter topology is having multiple switching state redundancies for each of the pole voltage levels. By using these switching state redundancies, capacitor...
We analyzed the local behaviors of both time and space harmonic magnetic fluxes in this research to improve the efficiency of inverter feeding induction motors. As a result, we clarified that: (1) the magnetic flux of time harmonics passes in parallel through rotor bars, and (2) the magnetic flux of space harmonics passes radially through the rotor bars from the delay side in the direction of rotation...
This paper proposes active braking schemes for both low and high power induction machines, without using external braking resistors or bi-directional converters as the front end. By dynamically manipulating losses using deadbeat-direct torque and flux control (DB-DTFC), kinetic energy can be dissipated rapidly within induction motors while maintaining accurate torque control. Loss spatial distribution...
This paper deals with an open-circuit IGBTs faults diagnostic method that is dedicated for three-phase two-level voltage inverter fed vector controlled induction motor drive systems. The presented technique is based on a transient analysis of a reference voltage space vector in a stationary reference frame and it does not require an extra sensors application. The diagnostic algorithm ensures to detect...
AC drives based on full digital control have reached the status of a maturing technology in a broad range of applications, ranging from low-cost to high performance systems. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. With speed estimation, sensorless vector control is possible,...
This paper presents an analysis of the magnetic saliencies in induction machines based on the injection of a zero sequence carrier. This way of injection allows evaluating those components of the admittance matrix which are not usually considered in the literature. The injection of the zero sequence carrier can easily be implemented, does not perturb the current control and the evaluation of its response...
Direct Torque Control has become a more and more important control technique in the control of Induction Motor for higher performance. The conventional two-level inverter has a problem of high torque ripple and large harmonics. For solving this problem, a model which is a combination of space vector modulation and a three-level inverter is proposed in this paper. On the platform of Matlab/Simulink,...
This paper describes an automatic identification procedure for an induction motor. The transfer function of the motor at standstill is used to obtain a linear parametric model. An on-line parameter estimator is then derived from this model. In the implementation of the proposed estimator, a PI current controller is constructed to stabilize the current signal and to prevent the flux from saturation...
This paper presents real time implementation of DSP based PWM control algorithm for 3 phase 4-leg IGBT voltage source inverter. This method is also useful for application in voltage source inverters for adjustable-speed ac drives. PWM method is used to reduce the harmonic content in the output voltage applied to induction motor. The pulses were generated using Texas Instruments TMS 320F28335 DSP controller...
In this paper a direct finite-state predictive flux and torque control of an induction motor drive system fed by four-switch three-phase voltage inverter was discussed. This specific inverter topology can be used after faulty inverter leg isolation from an electric motor under single IGBTs open-circuit faults. To overcome a significant problem related to the four-switch inverter topology, namely capacitor...
The paper deals with a transistor open-circuit faults diagnosis in a rotor field oriented controlled induction motor drive fed by a two-level voltage inverter. The diagnostic procedure ensures to detect and localize single power switch failures as well as single-phase transistor faults in a time shorter than one period of a stator current fundamental harmonic, without regard to a drive operation point...
All industrial applications are directly or indirectly dependent on induction motor. There would be a high amount of losses in the induction motor due to poor quality of voltage and current that is generated by the normal inverter. As number of levels of the output voltage increase, voltage quality increases. In the paper, multilevel inverter of seven levels which is connected in series sub-multilevel...
In this paper, space vector pulse width modulation (SVPWM) scheme for voltage fed inverter (VFI) using conventional method and artificial neural network (ANN) based approach are presented separately. In the conventional method, the difficulty of explicitly expressing cross-over and holding-angle as a function of modulation factor in overmodulation mode-I and mode-II respectively are overcome by introducing...
In this paper, space vector pulse width modulation (SVPWM) scheme for voltage fed inverter (VFI) using conventional method and artificial neural network (ANN) based approach are presented separately. In the conventional method, the difficulty of explicitly expressing cross-over and holding-angle as a function of modulation factor in overmodulation mode-I and mode-II respectively are overcome by introducing...
This article proposes a space-vector based pulse width modulation (SVPWM) scheme for a three-level dual-inverter-fed open-end winding induction motor drive. The proposed method introduces clamping of one inverter for 180° span of the rotation of the reference space vector. The proposed scheme neither requires sector identification nor lookup tables for the generation of the gating pulses. The switching...
This paper solves problematic of immunity of electric drive from the voltage sags on the power supply. Typical modern electric drive consist of the induction machine (or synchronous machine) supplied from indirect frequency converter with voltage-fed inverter and with non-controlled rectifier (or other - more complicated type of input side of this frequency converter). For this configuration are compared...
We present a field programmable gate array (FPGA) based implementation for direct torque control (DTC) of induction motor drives. The proposed design utilizes several improvements to execute the functional blocks in DTC that reduce the execution time and improve the sampling frequency. The FPGA system is implemented on a Xilinx Virtex-5 board using VHDL code assembled from scratch and the DSP based...
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