Liste des publications
A comparative Study of Two Types of DTC With Application of Artificial Intelligence: Fuzzy Logic and Neuron Network on the Performance of a Multi-level Inverter Fed Induction Machine
We present in this paper the simulation results of the speed control of a 3 levels inverter-fed induction machine controlled by the Direct Torque Control with application of artificial intelligence techniques both the fuzzy logic(DTC_FL) and the neural network (DTC_NN). A comparative study of these two techniques is also presented to illustrate the merits of each of the techniques on the performance of the 3-levels inverter-/induction machine set. Voir les détails
Mots clés : Induction machine, 3-Levels Inverter, Direct Torque Control (DTC), DTC_FL, DTC_NN
A COMPARATIVE STUDY OF TWO TYPES OF DTC WITH APPLICATION OFARTIFICIAL INTELLIGENCE: FUZZY LOGIC AND NEURON NETWORK ON THEPERFORMANCE OF A MULTI-LEVEL INVERTER FED INDUCTION MACHINE
We present in this paper the simulation results of the speed control of a 3 levels inverter-fed induction machine controlled by the Direct Torque Control with an application of artificial intelligence techniques both the fuzzy logic(DTC_FL) and the neural network (DTC_NN). A comparative study of these two techniques is also presented to illustrate the merits of each of the techniques on the performance of the 3-levels inverter-/induction machine set. Voir les détails
Mots clés : Induction machine, 3-Levels Inverter, Direct Torque Control (DTC), DTC_FL, DTC_NN
Analysis of the Electromagnetic Interferences betweenOverhead Power Lines and Buried Pipelines
The Analysis of electromagnetic interference between high voltage overhead power transmission lines and nearby gas/oil pipeline has been a topic of growing interest for many years. When pipelines are located in shared row with power lines, the pipeline can incur high induced voltages and currents due the AC interference. The induced voltage on pipeline can be dangerous for operator to touch the pipeline as well as pipe corrosion can result from AC discharge. This research evaluates and analyzes the electromagnetic interference effects on oil and gas buried pipelines created by the nearby high voltage transmission lines. The aim is to evaluate the AC corrosion likelihoods of pipelines and suggest proper mitigation solutions. Voir les détails
Mots clés : AC interference, Induced Voltages, Electric Power Transmission Lines, pipeline, AC Corrosion, Corrosion protection.
Three Nematogen Azobenzene-Based Stationary Phases for Capillary GC: Synthesis and Comparative Study
In this paper, three laterally substituted liquid crystals termed LCC1, LCC3 and LCC4 were synthesized. Characterization of these substances was carried out by 1H NMR and 13C NMR; they possess similar core and differ in their lateral substituents. Their thermal stability was conducted by thermogravimetric analysis and showed decomposition beginning at 212, 233 and 264 °C related to LCC1, LCC3 and LCC4, respectively. Thermal properties were determined by differential scanning calorimetry, thermomicroscopy and inverse gas chromatography. The three novel compounds exhibited a nematic mesophase at a defined range of temperatures, which varied from 81 to 55 °C. Lengthening of the lateral substituent seemed to affect the nematic range by decreasing it. Fused-silica capillary columns (30 m × 0.32 mm) were employed for the analytical study. Numerous mixtures of components of various properties were injected. Particular attention was given to the selectivity towards the close-boiling isomers. These investigations indicated that lateral attached groups had considerable effect on the thermal and chromatographic properties of the liquid crystal compounds. These interesting results may guide in improving the development of new type of liquid crystals with desired properties for a widespread application. Voir les détails
Mots clés : Capillary gas chromatography, Liquid crystals, Thermal Properties, Analytical properties
Condition Monitoring of Casting Process using Multivariate Statistical Method
Growing demand for higher performance, safety and reliability of industrial systems has increased the need for condition monitoring and fault diagnosis. A wide variety of techniques were used for process monitoring. This study will mainly investigate a technique based on principal component analysis in order to improve the accuracy for fault diagnosis of casting process. The process faults are identified using the following statistical parameters: Q-statistic, also called squared prediction error, and Q-residual contribution. The proposed method is evaluated using real sensor measurements from a pilot scale. The monitoring results indicate that the principal component analysis method can diagnose the abnormal change in the measured data. Voir les détails
Mots clés : Fault Diagnosis, process monitoring, principal component analysis, Q-statistic, Q-residual contribution
Champ thermique sous l'effet de la réaction chimique d'une réforme de la pile à combustible à oxyde solide SOFC DIR-interne direct
Les effets directs de reformage interne dans une pile à combustible à oxyde solide (SOFC) sur les champs thermiques sont étudiés par modélisation mathématique. Cette étude présente les champs thermiques d'une pile à combustible standard (Ni-YSZ / YSZ / LSM) anode en charge. Cette étude est également faite dans le plan perpendiculaire à l'écoulement des gaz. La pile à combustible est alimenté par de l'air et de carburant, CH4, H2, CO2, CO et H2O où la naissance du phénomène de la réforme (DIR-SOFC) interne direct. Il est basé sur la réforme de réactions chimiques, de la vapeur et de réaction de reformage réaction du gaz à l'eau. Le but principal de ce travail est la visualisation des champs de température sous l'influence des réactions chimiques mondiales et la confirmation du comportement thermique de cette réaction chimique. Les champs thermiques sont obtenus par un programme informatique (Fortran). Voir les détails
Mots clés : SOFC, Direct internal reforming, Global chemical reactions, Thermal fields
Dynamic Response of a Stand Alone DC Side Wind Energy Conversion System with Battery Energy Storage to a Wind Gust.
The study concerns particularly the DC side of the wind system, the continuity of the AC one being already studied in. Then,this work elaborates an analysis of the DC components, particularly the system conversion and storage of the wind system conversion. Indeed, the battery is a storage buffer essential in our case for isolated network. We emphasize its importance by evaluating its various features. The AC study concerned the analysis and simulation of a low speed Permanent Magnet Synchronous Generator (PMSG) driven by a vertical wind turbine through a Pulse-Width Modulation (PWM) voltage inverter. Renewable resources are in constant fluctuation. Therefore, in order to maximize the efficiency of the renewable energy system it is necessary to track the maximum power point of the input source. In this system, the maximizing is assured while considering the optimal power curve as load characteristic, with the knowledge of the turbine characteristic Cp (λ). The study was accomplished on MATLAB/Simulink and Script platforms. Voir les détails
Mots clés : Permanent Magnet Synchronous generator, mdel, DC side, Storage, Small Wind Turbine
PV Cell Temperature/ PV Power Output Relationships Homer Methodology Calculation
Because of the intermittent solar irradiation whichhighly influences the resulting energy production, the majoraspects in the design of PV power generation systems are thereliable power supply of the consumer under varyingatmospheric conditions and the corresponding total system cost.Thus it is necessary to select the number of PV modules andbatteries, and their installation details such as the power will beuninterruptedly supplied to the electrical load, andsimultaneously the minimum system cost would be achieved.But it’s especially so judicious to take into account the wholesystem parameters such as cell temperature, a task ensured byseveral software tools as Homer from the NREL Laboratory.As known, meteorological parameters especially the arraytemperature, do not remain constant the whole day long, butchange considerably. Then, it is worth investigating the influenceof the daily average temperature variation on the predictedperformances of the optimized system.It’s so important to seize how such software proceeds to get around any result calculation and a possible problem at the same time.So, the goal achieved through this study is to investigate theinfluence of the cell temperature and head changing effects onthe system performances. So an approach by a mathematical formalism is then indispensable. Voir les détails
Mots clés : solar layer, PV cell temperature, PV power output, mathematical formulation, calculation, Homer.
MPPT Control of a Small PV Generation System under Diverse Weather Conditions
The power induced in the photovoltaic modules is influenced by the intensity of solar cell irradiation, temperature of solar cells and moreover by the load. Therefore, to maximize the efficiency of the renewable energy system, it is necessary to track the maximum power point of the input source. In this work, we tie to present the constituent of a weak power PV chain dedicated to the storage on battery. The battery bank is connected to the DC network via a DC/DC boost converter, called the storage converter, used for controlling the network.Indeed, the battery is only imperative buffer storage in this case. The PV units are connected to the DC network via its own DC/DC converter, called PV converter, to ensure the required power flow. The purpose of the proposed model is the simulation of the complete system behavior from the electric and energy point of view. A maximum power point tracker (MPPT) scheme is applied through the boost converter to improve the energy conversion efficiency. Fuzzy algorithm based on linguistic rules describing the operator’s control strategy is applied to control the step-up converter for MPPT. On the other hand, Fuzzy logic control based on coarse and fine mode is incorporated in order to reduce not only the time required to track the maximum power point but also power fluctuation. A confrontation with a P and O method performed. Another fuzzy battery-charge controller is also applied. Simulation results show that the proposed fuzzy controller exhibits a better performance than the controller based upon the P and O method. Voir les détails
Mots clés : Photovoltaic, simulation, MPPT; DC-DC converter, Fuzzy controller
Removal of AY99 from an aqueous solution using an emulsifiedliquid membrane. Application of Plackett-Burman Design
Water contaminated with dyes presents serious environmental problems. An important quantity of dyes is released asindustrial waste in nature. As part of the recovery and the regeneration of these complexes, the extraction of a cationic dye AcidYellow 99 has been the subject of this work. To removal dyes from industrial wastewater, the technique of extraction byemulsion liquid membrane could provide an industrial success. The membrane used in this study consisted of SPAN80 asemulsifier and aliquat 336 as extractant. The stability of the emulsified liquid membrane has a very important role in theextraction. A study of the effects of different components of the membrane is necessary. The process parameters were studiedusing a statistical method of experimental Plackett-Burman design, This method allows us to study the effects of different factorssimultaneously and determines which factors are most important parameters. The modeling was done by a mathematical modelrepresenting the extraction yield according to various factors. The most significant factors on the elimination of the acid yellow99by the emulsion liquid membrane were then studied. Voir les détails
Mots clés : emulsified liquid membrane, modeling, recovery, acid yellow, design of experiment (DOE).