This paper deals with fault diagnosis of induction machines based on the discrete wavelet transform. By using decomposition, information health a system can be extracted from signal over wide range frequencies. analysis is performed in both time and frequency domains. The Daubechies selected for stator current. Wavelet components appear to useful detecting different electrical faults. In this paper, we will study problem broken rotor bars, end-ring segment, loss phase during operation.

Several techniques for estimating power losses in insulated-gate bipolar transistors (IGBTs), diodes and MOSFETs are known. Most of the approaches literature deal with PWM switching technique. In this paper presents a feasible loss model to estimate IGBT operation. The is coupled RC (Foster) Network using Thermal Impedance. This investigates IGBT's associated Diodes as function circuit temperature variation during A full presentation electro-thermal has been developed simulated.

In this paper, a model based on the finite element analysis has been developed for healthy and eccentric PMSM. The proposed is analyzed by time stepping Finite method. electromagnetic field distribution, air-gap magnetic flux density leakage inductances under rotor have calculated. Meanwhile, MCSA of faulty PMSM inspected various static eccentricity levels.

A high precision search coil is used for monitoring of the broken bars in squirrel cage induction machines. The searches coils are implemented a finite element model witch describe real behavior machine. external fixed on Ox and Oy axis analyzing leakage flux outer region. method offer number advantages including compact size sensor, great accuracy, bandwidth, low cost, it applicable even already fabricated electric performance evaluated by some default degrees. voltage spectral analysis has...

This paper presents the dynamic eccentricity (DE) in squirrel cage induction machine obtained by simulation using finite element method (FEM) and experimental tests. Motor current signature analysis (MCSA) through power spectral density (PSD) is used to monitor low frequency components related rotor faults. In order generalise study, a comparison was performed between faulty machines healthy, under different load conditions. The tests show encountered difficulties detection of various...

This paper presents a spectrum analysis of the terminal voltage after supply disconnection. is induced only by rotor flux and does not depend on mechanical load, time harmonics, etc... The diagnosis technique based monitoring amplitude harmonics components in frequency domain using both FFT MUSIC methods. experimental results show presence order 6mplusmn1, m=1,2,3... for healthy faulty machine. When there bar fault, these grows. spectral shows that method more reliable than technique,...

The aims of this paper are the diagnosis and mitigation corrosion induced by HVPTL onto buried pipelines. To do this, firstly magnetic field alternating current density pipeline were calculated. Then, effect densities was characterized electrochemical measurements. obtained results shown that induction caused high voltage power lines (HVPTL) affects character accelerate their corrosion. However, one technical solution proposed to mitigate pipelines from

This paper deals with an experimental study on stator and rotor faults of squirrel cage induction motors. The summaries the harmonic currents for starting permanent operation qualitatively revealed We also raised vibrations motors by use accelerometer. accelerometer is used in several places motor azimuthally position to determine faults. It allowed us bring some critiques tests interpretation our results there pertaining.

This article introduces a novel approach called randomized carrier-based discontinuous pulse width modulation (RCDPWM) to address the challenge of mitigating both low-order and high-order harmonics concentrated at switching frequency its integer multiples in output voltage current three-level inverter. The proposed strategy reduces losses wide dispersion with significantly smaller amplitudes by integrating features from PWM methods. characteristic proves beneficial for enhancing efficiency...

Self-excited induction generators (SEIGs) require carefully designed capacitor banks to maintain stable operation. This paper compares a bank design approach based on general parameters with one derived from the magnetizing reactance of three-phase generators. Finite element method simulations in Simulink are used analyze and optimize performance these configurations. The results provide insights into most effective designs for achieving reliable self-excitation

The information extraction capability of the widely used signal processing tool, FFT for diagnosing induction machines, is commonly at a constant load or different levels. loading level major influencing factor in diagnostic process when coupled and machine come with natural mechanical imperfections, low load, faults harmonics are strongly influenced. In this context, main objective work detection study effect on motor process. We have employed diagnosis method based discrete wavelet...

This paper addresses the spectral characteristics of a dual randomised pulse width modulation scheme (RCFM-RPPM) for reducing conducted EMI in basic DC-DC converters (buck, boost, and buck-boost) operating discontinuous conduction mode (DCM). It combines two simple schemes, random carrier frequency (RCFM), position (RPPM). First, modulating principle PWM is presented. Then, mathematical model power density (PSD) that characterises switch voltage three derived. The validated by simulation...

In This work, we present a Modulated Hysteresis Current Control (MHCC) strategy applied to control the grid side converter in wind energy conversion systems (WECs) associated flywheel storage system (FESS). The goal of this is lead constant switching frequency converter, low THD current and unit power factor. simulation results, obtained with variable profile, show an adequate dynamic using MHCC compared results same classical (HCC) Sine Pulse Width Modulation (SPWM).

The estimation of induction motor temperature at rated load under normal and faulty conditions is investigated in this paper. Motor estimated using thermal models based on the lumped parameters distributed losses. model accounts heating sources, cooling sources resistances motor. proposed used to study behaviour during balanced condition opening phase situation. these states predicted by validation global network model. It shown that rise exceeds widely operating temperature. curves...

Ce papier présente une application de la technique des ondelettes dans le domaine du diagnostic défauts machine asynchrone à rotor cage. Dans ce travail, est utilisée pour détecter rupture barres rotoriques et les portions d’anneau court-circuit. La détection basée sur fait que n’importe quelle au niveau induit déformation FMM l’entrefer qui se traduit par composantes supplémentaires courants statoriques. validée signaux expérimentaux obtenus partir machines asynchrones cage défectueuses.

This paper presents a novel method for modelling and diagnosis of electrical mechanical faults in fixed-Speed Self-Excited Induction Generators (SEIGs) operating autonomous mode small-scale wind energy system. The proposed is validated using the finite element method. After selection magnetising capacitors, self-excitation process performed under no-load conditions. Once stator voltage established, symmetrical three-phase load connected. fault detection introduced here called Stator Current...

This paper presents the dynamic eccentricity (DE) in squirrel cage induction machine obtained by simulation using finite element method (FEM) and experimental tests. Motor current signature analysis (MCSA) through power spectral density (PSD) is used to monitor low frequency components related rotor faults. In order generalise study, a comparison was performed between faulty machines healthy, under different load conditions. The tests show encountered difficulties detection of various...

The penetration of doubly fed induction generator (DFIG) into the power grid has become an important concern for system engineers today. Voltage stability is factor to maintain wind farm in service during some abnormal operating conditions. This paper deals with integration synchronous static compensator (STATCOM) overcome voltage issue systems connected turbine. A dynamic model DFIG been presented and a STATCOM stable studied low developed simulated results demonstrate that good control...

This article presents an application of different control strategies to highlight the performances induction generator in a wind system. First, direct torque (DTC) method was applied and then, have constant frequency low THD network current, modulated hysteresis (MHDTC) used. To verify high this method, comparison with two other based on field oriented theory (FOC) has been made. The first one used conventional PI controller second Fuzzy Logic (FOC+FLC). Simulation results obtained using...

The penetration of doubly fed induction generator (DFIG) into the power grid has become an important concern for system engineers today. Voltage stability is factor to maintain wind farm in service during some abnormal operating conditions. This paper deals with integration synchronous static compensator (STATCOM) overcome voltage issue systems connected turbine. A dynamic model DFIG been presented and a STATCOM stable studied low developed simulated results demonstrate that good control...