IJE_Vol 04 N 01
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Item Study of photovoltaic systems with differences connecting configuration topologies for applications in renewable energy systems(جامعة الوادي - university of el oued, 2019-04-28) Mouhoub, Birane; Abdelghani, ChahmiThis paper focuses in the optimization of the efficiency of photovoltaic power conversion systems; we present a new alternative for improving both the optimization of the efficiency of photovoltaic power conversion chain. In this way, we present to the valuation problem of photovoltaic by new coupling systems between photovoltaic generators and their loads and performance of photovoltaic (PV) systems and the efficiency of the energy conversion by using different configuration of power converters. Different type’s improvements have been proposed of different architecture in order to choose the correct PV architecture for each PV installation on the efficiency improvement in all power conversion level stages between PV cells and loads. In this context, this work presents the study and adaptive simulation of photovoltaic systems with micro inverters configurations for applications of renewable energy. We performed comparative between a central and distribution connection of converter via an adaptation floor with Maximum Power Point Tracker (MPPT) control. For this reason, it is important to know different types of architecture and different configuration of power converters in order to choose the correct PV architecture for each PV installation. Simulation results are used to demonstrate the proposed topologies to provide improvement in efficiency over existing traditional PV systems.Item Simulation and optimization of CH3NH3PbI3 based inverted planar heterojunction solar cell using SCAPS software(جامعة الوادي - university of el oued, 2019-06-27) Hima, Abdelkader; Le Khouimes, Ahmed Khalil; Abdallah, Rezzoug; Ben Yahkem, MouslemIn order to improve the efficiency of a planar heterojunction organic-inorganic solar cell, this work is carried out using SCAPS software. The studied inverted P-I-N structure is PEDOT:PSS/ CH3NH3PbI3/ PCBM where PEDOT:PSS is the hole transporting layer (HTL), CH3NH3PbI3 is the Perovskite absorber layer (PVK) and PCBM is the electron transporting layer (ETL). The simulated structure is sandwiched between SnO2: FTO and Al which are the transparent and aluminum electrodes respectively. Simulation efforts are focused on thickness and density of states (donor’s and acceptors) effect on solar cell efficiency. Found results improved the power conversion efficiency (PCE) from 11.73% up to 19.58 %.Item Selection of parameters to predict dew point temperature in arid lands using Grey Theory: a case study of Iran(جامعة الوادي - university of el oued, 2019-02-27) Qolipour, Mojtaba; Mostafaeipour, Ali; Rezaei, Mostafa; Behnam, Elham; Goudarzi, Hossein; Razmjou, AliAbstractDew point is the temperature at which water vapor in the air condenses into liquid with the same rate it evaporates. Dew point study is important in arid lands with low rainfall, also in other regions with various hydrological and climatological conditions. In this study, the Grey theory is applied for the first time to propose a framework approach to identify the important parameters affecting the prediction of dew point temperature. The ability of Grey theory to estimate and rank the parameters of a problem with missing data and uncertain conditions means that it has a good potential for mentioned application. For this research, 8 parameters are selected using literature review including: global solar radiation on a horizontal surface (H), water vapor pressure (VP), atmospheric pressure (P), sunshine duration (n), minimum air temperature (Tmin), maximum air temperature (Tmax), average air temperature (Tavg), and Relative Humidity (RH). The study is conducted for the city of Abadeh in Iran by using the data pertaining to a 10 year period between 2005 and 2015. The findings show that RH, Tavg, P, Tmax, Tmin, H, n and Vp with the grey possibility degrees of, respectively, 0.534, 0.551, 0.608, 0.622, 0.635, 0.695, 0.697 and 0.712, are the most important and effective parameters in prediction of dew point temperature. The proposed method also prioritizes the studied parameters in the order of their effectiveness on predicted dew point temperatureItem Fuzzy Logic Based Robust DVC Design of PWM Rectifier Connected to a PMSG WECS under wind/load Disturbance Conditions(جامعة الوادي - university of el oued, 2019-05-20) Saidi, Y; Mezouar, Y; Miloud, A; Benmahdjoub, M. A; Yahiaoui, M MPermanent Magnet Generator has been widely used in Variable-Speed Wind Energy Conversion System (VSWECS). Fuzzy Logic Control (FLC) of the generator side converter has the ability to have a good regulation of the DC-link voltage to meet the requirements necessary to achieve optimal system operation, regardless of the disturbances caused by the characteristics of the drive train or some changes into the DC-load. The main focus of this paper is to present a model for a three phase voltage source space vector pulse width modulation (SVPWM) rectifier which is connected to a PMSG in a wind turbine system, where a direct voltage control (DVC) using FLC based on voltage orientation strategy is used to control the mentioned rectifier. The control algorithm employs fuzzy logic controller to effectively achieve a smooth control of DC-link voltage under wind/load perturbation conditions. Some simulation results, using Matlab/Simulink, are presented to show the effectiveness of the SVPWM rectifier Connected to a PMSG WECS with the proposed control strategy.Item Feasibility study based on economic perspective of cobalt nanoparticle synthesis with chemical reduction method(جامعة الوادي - university of el oued, 2019-02-28) Nandatamadini, Fira; Karina, iSuci; Nandiyanto, Asep Bayu Dani; Ragadhita, RistiCobalt nanoparticle powder is synthesized by a chemical reduction method. In short, it is synthesized through reduction of cobalt ions that are dissolved in aqueous solution by Boronrelated solution with cationic surfactant. Cobalt nanoparticles have many applications, especially in the field of engineering. The successful project for the production of cobalt nanoparticles will produce opportunities that make it possible to advance technology in developing countries. For this reason, a feasibility study for the synthesis of cobalt powder nanoparticles is needed. This project has estimated ideal conditions for worst cases that will occur in production by adding several parameters: raw materials and sales. Evaluation of this feasibility study is using two parameters, which are economic analysis and evaluation techniques, including Gross Profit Margin (GPM), Cumulative Net Present Value (CNPV), Break-Even Point (BEP), Payback Period (PBP) this parameter to show potential profitability for the project. The IRR value of this project that it is not very promising, but all evaluations with various parameters have a positive impact. The project also uses the method of reducing metal salt an easy and the total cost of purchasing relatively inexpensive equipment will provide benefits in the project, and investors will attract this project.Item Elastic, mechanical and thermodynamic properties of zinc blende III-X (X= As, Sb): ab-initio calculations(جامعة الوادي - university of el oued, 2019-05-15) IBRIR, Miloud; HADJAB, Moufdi; BATTAL, Gazi Yalcin; BOUZID, Fayçal; HADJ LARBI, Abderrahim; BOUDOUR, Samah; NEZZARI, HasseneIn this work, density functional theory plane-wave full potential method, with local density approximation (LDA) are used to investigate the structural, mechanical and thermodynamic properties of of zincblende III-X ( X= As, Sb) compends. Comparison of the calculated equilibrium lattice constants and experimental data shows very good agreement. The elastic constants were determined from a linear fit of the calculated stress-strain function according to Hooke’s law. From the elastic constants, the bulk modulus B, shear modulus G, Young’s modulus E, Poisson’s ratio σ, anisotropy factor A, the ratio B/G and the hardness parameter H for zincblende III-X ( X= As, Sb) compound are obtained. Our calculated elastic constants indicate that the ground state structure of III-X ( X= As, Sb) is mechanically stable. The sound velocities and Debye temperature are also predicted from elastic constantsItem Detection and Diagnosis faults in Machine asynchronous based on single processing(جامعة الوادي - university of el oued, 2019-04-20) Chouidira, Ibrahim; Khodjae, Djalal Eddine; Benguesmia, HaniIn this work, we proposed multi-winding model for the simulation of broken bars in squirrel cage asynchronous machine, this model allows to study the influence of the broken bar defects on the behavior general of machines in different operating conditions (healthy and faulty). The breaking of the most frequent bars of the rotor causes oscillations of the torque, speed, and the current, the increase of the resistance of the rotor creates the defects proportional with the number of breaks bar K .The diagnosis fault using technique of single processing based on Spectrum analysis for detection broken bar. The results of the simulation obtained allowed us to show the importance of this technique for detection broken barItem A Review of Requirement Engineering Process Models, Tools and Methodologies(جامعة الوادي - university of el oued, 2019-06-27) Faroom, SaeedAs we are living in the Era of Computer Science and almost all individuals and the organizations are completely relying on software systems. The requirement engineering is the most vital and important aspect in the success of any software engineering project. Requirement Engineering is a set of different process that works at different levels, which are incorporated at individual and organizational level Projects We need to consult different sources to find requirements. We need to involve personals from the different fields to find a set of quality requirements. The security issues undergoes as soon as early in the 1st phase of requirements. It is shown from the studies that if we consider Quality Process of Requirement Engineering at the phase it results in saving of million dollars. This paper contains the details study and comparison of different RE Process Models and Requirement Elicitation techniques. This paper elaborates the vital aspects of different Requirement Engineering Process models that help in the selection of appropriate model for the Requirement Engineers and practitioners working in the industry. This Paper also Focus on the giving a detailed view of Elicitation techniques and comparative study including the characteristics and their strengths and weakness. Some strengths and weakness found during detailed study are also structured and listed that is also the helpful for the Appropriate selection of RE Process model