Algerian Journal of Renewable Energy and Sustainable Development

Non-Linear Control By Status Feedback Of The Three-Phase Asynchronous Machine

2024-04-26T14:31:10+02:00

This paper deals with a nonlinear system control technique, called control by state feedback. The application is on the speed of a three-phase asynchronous motor, but this time the return of the states of the controlled system is nonlinear so we are faced with an interconnected mathematical structure, the advantage of this type of control is the assurance of the robustness against sudden parametric variations of the motor, especially at full load or long-term traction work. A series of simulations was carried out under the MATLAB-SIMULINK environment to demonstrate the robustness and rigidity yet the stability of the proposed control.

A Comparative Analysis of series and parallel topologies of Perturb and Observe (P&O) and Incremental Conductance (InC) MPPT Algorithms for Photovoltaic System

2023-06-20T23:05:19+02:00

Photovoltaic (PV) is considered one of the most important sources of energy in the world, owing to its inherent advantages of being cheap, environmental friendliness, and energy-efficient. To increase the output power of the solar PV system, it is most important to enforce it to operate at the highest possible maximum power point tracking (MPPT) algorithm lead an important role in optimization the performance of a photovoltaic (PV) generation systems. This paper compares two widely used MPPT algorithms, namely the Perturb and Observe (P&O) method and the Incremental Conductance (IC) method, known for their low cost and eases of realization. The algorithms were evaluated based on important parameters such as voltage, current, and power output for different combinations, with and without shading. The performance of the photovoltaic array was evaluated using the MATLAB Simulink toolbox. The simulation results demonstrate that the IC method can rapidly detect the maximum power point (MPP) when irradiance changes suddenly, with faster convergence and higher accuracy than the P&O algorithm. Simulations are performed to test the controller's capability oftracking the MPP when sudden variations in weather condition

Physicochemical Investigation of Convective Solar Drying for Post-Harvest Conservation of Hot Peppers in Adrar, Algeria

2023-06-20T23:21:18+02:00

In this study, the impact of convective solar drying on the physiochemical characteristics of hot peppers harvested in Algeria was investigated. The freshly harvested peppers underwent convective drying until they reached a desired stable weight. Various parameters including moisture content, water activity (Aw), pH, crude protein, crude fat, total sugars, and polyphenol content were measured. The drying process, using an optimal method, took approximately 2 to 3 days and resulted in moisture content levels of (32.41 %), Aw of (0.26%), pH of (4.1), acidity of (2.8), ash content of (73.38%), dry matter of (67,59 %), total protein content of (0.83%), sugar content of (2.9%), polyphenol content of (89%), and crude fat content of (0.23%). In comparison, the values for the freshly harvested hot peppers were (89%), (0.92%), (5.34%), (3.6%), (8%), (11%), (1.64%), (1.64%), (125%), and (0.36%) respectively. These findings confirm that solar drying effectively preserved the nutritional quality of the hot peppers, with minimal losses in some properties compared to the values of the freshly harvested peppers

Golden Jackal Algorithm for Optimal Size and Location of Distributed Generation in Unbalanced Distribution Networks

2023-06-21T10:20:13+02:00

The Golden Jackal Optimization algorithm (GJO) is used in this study to address the problem of optimal placement and sizing of single and multiple distributed generators (DGs) on the IEEE123 test system. The proposed approach attempts to minimize the total power loss of the system while respecting the voltage and power limits. The GJO algorithm is a new meta-heuristic algorithm inspired by the behavior of the golden jackal in the wild. The GJO algorithm is used to find the ideal location and sizing of DGs, and the results are compared with those obtained by other meta-heuristic techniques. According to the simulation results, the GJO method outperforms other metaheuristic algorithms in terms of problem-solving, while satisfying all constraints of the system. The proposed approach also demonstrates the effectiveness of the GJO algorithm in the solution of complex optimization problems in power systems

Identification of Cracks in Functionally Graded Material Beams Using the H-Version of Finite Element Method

2023-06-21T10:25:19+02:00

In this article, we analyze the effect of transverse cracks on the natural frequencies of a Euler-Bernoulli functional gradient beam. The studied beam was discretized into finite elements and the global matrices of the motion equation are determined by applying the Lagrange equation to the beam kinetic and deformation energies. The material properties are considered to vary in the directions of the beam thickness, the gradation is described by the power-law distribution, the stiffness of the cracked element is determined based on the reduction of the beam cross-section. The numerical results obtained are compared with those available in the previous study. Finally, case studies were carried out to analyses the influence of the power law index, the depth and the opposition of the crack on the natural frequencies of the beam for different boundary conditions; these studies demonstrate the advantage of the FGM beam over the purely metal beam.

Study of the Influence of Doping on the Structural, Optical and Electrical Properties of zinc oxide thin Films Produced by by Spray Pyrolysis for Solar Cell Applications

2023-06-21T10:27:34+02:00

In the present study, the effect of Al doping with 0.5 % Al (AZO-0.50), 1 % Al (AZO-1.00), and 1.5 % Al (AZO-1.50) have been successfully synthesized by Spray Pyrolysis method. The structural, optical and electrical properties of the obtained films was studied. The obtained films are characterized by different techniques such as X-ray diffraction (XRD), UV-visible and electrical Hall Effect measurements. The X-ray diffraction confirmed that the Al doping did not change the ZnO Hexagonal Wurtzite structure. Spectroscopic measurements in the UV-VIS-IR wavelength range were found to give good average transmittance values of about 73%, with a high transmittance of 75% with 0.5% Al doping. The optical gap value increases in the range of 3.23 to 3.26 eV with increasing aluminium content. The electrical analysis shows that the conductivity improved with doping compared to the pure ZnO film

Valorization of Frying Oil As Fuel (Biodiesel)

2023-06-21T10:31:34+02:00

Over the past three decades, biodiesel has experienced remarkable development. This fuel, obtained from vegetable oils or animal fat, has the advantage of being renewable, less polluting, and reduces the energy dependence of oil-importing countries.In this article, we are interested in the production of a biofuel based on non-food used frying oil. The physico-chemical characteristics for Oleor vegetable oil are found to comply with established standards. After subjecting the oil to repeated frying using potatoes, followed by a physico-chemical evaluation, the results obtained showed the thermo-oxidative alteration of this oil, confirmed by the evolution of the physico-chemical indices. chemicals during frying.

At the end, this used oil is recovered as fuel (biodiesel). The production of biodiesel is obtained by the transesterification reaction, with a conversion rate of 85%. The physico-chemical properties determined are very interesting and close to those of commercial diesel

Analyze and Evaluate the Electrical Performance of PV Isofotón-100W Modules Exposed for a long Time in the Desert Environment

2023-06-21T10:34:22+02:00

The degradation of the electrical performance of photovoltaic panels Isofotón-100W exposed to the sun for a long period of about 10 years in a Saharan environment of Adrar was presented. In this article, we will present some experimental results obtained during the analysis of the I-V characteristics of some Isofotón-100W photovoltaic panels tested in the real conditions of the Saharan environment (Adrar region). The degradation of the electrical performance of the Isofotón-100W module is visualized through the analysis of the I-V and P-V characteristics experimentally or by visual field inspection of a renewable energy research unit in a Saharan environment. The physical parameters of the equation governing these characteristics were determined by the effective iteration method using only the information in the data sheet. The comparison between the experimental characteristic curves I-V and P-V of the photovoltaic modules (Isofotón-100W) and the reference in STC shows that the degradation of the electrical performances are due globally by the delamination and the discoloration of the EVA encapsulate after the long term exposure in a desert environment

Study and Simulation of Self-supply of a Building by Photovoltaic Energy

2023-06-21T10:47:40+02:00

Offcial statistics show that two billion people in the world do not have direct access to the electricity grid. For this purpose, an autonomous photovoltaic system (SPVA) is one of the solutions that can fix this problem. The optimizing of an SPVA is a very complex issue. Therefore, a compromise solution must be made between having acceptable energy and economic cost for the consumer, and a relatively good quality of energy supply. The management of load profiles, in order to get closer to the ideal solar consumer, allows for reducing the size of the system. the objective of this work is dimensioning of a photovoltaic installation applied to a building case of laboratory University of Adrar (LDDI) given with all the different steps to follow

Structural, Electrical and Optical Properties of Fe-doped CuO Deposited by Spray Pyrolysis TechniqueStructural, Electrical and Optical Properties of Fe-doped CuO Deposited by Spray Pyrolysis Technique

2023-06-22T13:17:08+02:00

Our work consists in depositing the copper oxide Fe doped CuO films by spray obtained from the solution of copper chloride CuCl2 and FeCl2 with a percentage of 2, 4; 6 and 8%, on glass substrates at a temperature of 3500c. The thin films obtained are characterized by X-ray diffraction, visible UV spectroscopy and the four-point technique.With X-ray diffraction, high peak intensity is obtained for the preferential orientations of (002) and (111), this intensity increases as the doping rate increases and gives us a more crystalline structure for a doping rate of 8%, also a grain size were estimated. The transmission of our films varies between 55% and 75% with a high absorption in the visible domain, the resistivity of our films increase with the increase of doping rate and the gap energy varies between 4.00 and 1.47 eV

Inﬂuence of temperature and Thermodynamic Analysis on Adsorption/Desorption Isothermss for green menth.

2024-04-26T14:31:22+02:00

The objective of this study is to experimentally determine the sorption isotherms and thermodynamic properties of green mint after undergoing thermal and biochemical treatment. The method employed is the gravimetric method using saturated saline solutions at various temperatures. In order to model and predict the hygroscopic behavior during drying and storage, we have utilized developed mathematical models (such as the Langmuir, GAB, modified BET, Peleg models, etc.). The adjustment and optimization of these models will be conducted using statistical techniques to analyze the obtained data. The isosteric desorption heats of green mint will be calculated using the Clausius-Clapeyron equation. This study will provide an expression to predict the thermodynamic properties of green mint.