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Journal of Water Resource and Protection 2022年第6期14卷 456-473页

作者： Ibrahima Niane Amadou Diao Fakoro Souleymane Dia senghane mbodji Research Team in Renewable Energies Materials and Laser of Department of Physics UFR SATIC Alioune DiOP University of Bambey Bambey Senegal Laboratory of Semiconductors and Solar Energy Department of Physics Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal

In our center where a lot of water is used for watering and cleaning the classrooms, the management of wastewater as a resource can be a real opportunity. The main objective of this research is to size and determine the effectiveness of natural treatments of the wastewater treatment system composed of a septic tank and a treatment plant which would be installed in site Ngoundiane of Alioune DiOP University, in Bambey, Senegal. Overall, we noted that the sized septic tank dimensioned in our study allows the efficient settling of wastewater which depends on the flow point ratio and useful settling surface area that must be lower than the upward speed that corresponds to 0.8 m/h. The sizing of the septic tank led us to obtain a useful capacity of 88 m3 and a horizontal surface of 44 m2 with a height of 2 m. The ratio between the flow of the wastewater received and the upward speed is 0.17 m/h and is significantly lower than the recommended speed. In addition, the station will be able to eliminate 80.418% of the Biochemical Oxygen Demand (BOD), 75.522% of the Chemical Oxygen Demand (COD), 92.385% of Suspended Solid (SS) and 43.427% of Nitrogen compounds.

关键词： Wastewater Septic Tank Sanitation Treatment Plant Irrigation

Experimental Analysis to Extract the Maximum Output of Serial and Parallel PV Module Configurations under Partial Shadow Conditions: A Case Study for Bambey, Senegal

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Energy and Power Engineering 2022年第7期14卷 233-247页

作者： Cheikh Saliou Toure Papa Lat Tabara Sow Fakora Dia senghane mbodji Renewable Energies Materials and Laser (ERML) Alioune DIOP University of Bambey Bambey Senegal

Using an experimental setup, the series configurations (SC) and the parallel configurations (PC) of the PV cell connection are studied to compare their performance under the condition of partial shading s. The performance of the configurations is evaluated by comparing the open-circuit voltage, the short-circuit current, the maximum power point (MPP), the voltage and current corresponding to MPP, and the Fill Factor (FF). The variations of the series resistance and the shunt resistance of a PV module under different irradiance levels are also determined by considering the effect of thermal voltage. Finally, a comparison between the performance losses in the different configurations is presented. The results of this study show that the parallel configuration has the best performance under the conditions of partial shade in the context of this work.

关键词： PV Cell Partial Shading Series Configurations (SC) Parallel Configurations (PC) Fill Factor (FF) Maximum Power Point (MPP)

A Junction Electric Field Determination of a Bifacial Silicon Solar Cell under a Constant Magnetic Field Effect by Using the Photoconductivity Method

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Journal of Modern Physics 2021年第5期12卷 635-645页

作者： Amadou Diao Bada Thiaw Mountaga Boiro senghane mbodji Gregoire Sissoko Semiconductors and Solar Energy Laboratory Cheikh Anta Diop University Dakar Senegal Research Team in Renewable Energies Materials and Laser Alioune Diop University Bambey Senegal

In this work, a theory based on the steady photoconductivity method, of a bifacial silicon solar cell under polychromatic illumination and a magnetic field effect, is presented. The resolution of the continuity equation in the base of the solar cell, allowed us to establish the expression of the minority carriers’ density from which the photoconductivity, the photocurrent density, the photovoltage and the solar output power as function of the junction recombination velocity and the applied magnetic field, were deduced. From I-V and P-V characteristics of the solar cell, optimal photovoltage and optimal photocurrent obtained at the maximum power point corresponding to a given operating point which is correlated to an optimal junction recombination velocity, were determined according to the magnetic field. By means of the relation between the photocurrent density and the photoconductivity, the junction electric field has been determined at a given optimal junction recombination velocity.

关键词： Bifacial Solar Cell Photoconductivity Junction Recombination Velocity Magnetic Field Electric Field

Modelling Study of Magnetic Field’s Effects on Solar Cell’s Transient Decay

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World Journal of Condensed Matter Physics 2015年第4期5卷 284-293页

作者： senghane mbodji Martial Zoungrana Issa Zerbo Biram Dieng Gregoire Sissoko Department of Physics Alioune DIOP University of Bambey Bambey Senegal Laboratoire d’Energies Thermiques et Renouvelables (L.E.T.RE) Departement de Physique U.F.R-S.E.A Universite de Ouagadougou Ouagadougou Burkina Faso Laboratory of Semiconductors and Solar Energy Department of Physics Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal

Experimental setup of transient decay which occurs between two steady state operating points is recalled. The continuity equation is resolved using both the junction dynamic velocity (Sf) and back side recombination velocity (Sb). The transient excess minority carriers density appears as the sum of infinite terms. Influence of magnetic field on the transient excess minority carriers density and transient photo voltage is studied and it is demonstrated that the use of this technique is valid only when the magnetic field is lower than 0.001 T.

关键词： Solar Cell Recombination Parameters Magnetic Field

A 3D Modelling of Solar Cell’s Electric Power under Real Operating Point

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World Journal of Condensed Matter Physics 2015年第4期5卷 275-283页

作者： Mayoro Dieye senghane mbodji Martial Zoungrana Issa Zerbo Biram Dieng Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Department of Physics Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal Department of Physics Alioune DIOP University of Bambey Bambey Senegal Laboratoire d’Energies Thermiques et Renouvelables (L.E.T.RE) Departement de Physique U.F.R-S.E.A Universitede Ouagadougou Ouagadougou Burkina Faso

This work, based on the junction recombination velocity (Sfu) concept, is used to study the solar cell’s electric power at any real operating point. Using Sfu and the back side recombination velocity (Sbu) in a 3D modelling study, the continuity equation is resolved. We determined the photocurrent density, the photovoltage and the solar cell’s electric power which is a calibrated function of the junction recombination velocity (Sfu). Plots of solar cell’s electric power with the junction recombination velocity give the maximum solar cell’s electric power, Pm. Influence of various parameters such as grain size (g), grain boundaries recombination velocity (Sgb), wavelength (λ) and for different illumination modes on the solar cell’s electric power is studied.

关键词： Electric Power Grain Size Grain Boundary Recombination Velocity Polycrystalline Solar Cell Junction Recombination Velocity

Analysis of T-Coefficients Using the Columnar Cylindrical Orientation of Solar Cell Grain

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Smart Grid and Renewable Energy 2018年第3期9卷 43-56页

作者： Serigne Ndiangue Leye Ibrahima Fall senghane mbodji Papa Lat Tabara Sow Gregoire Sissoko Research Team in Renewable Energies Materials and Laser of Department of Physics Alioune DIOP University of Bambey Bambey Senegal Laboratory of Semiconductors and Solar Energy Department of Physics Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal

We report the study of the temperature dependance of the performance electronic parameters of an N-P solar cell by considering as model, the columnar cylindrical orientation associated to the dynamic junction velocity (SF) concept. We presented the photocurrent-photovoltage (I-V) and Power-photovoltage (P-V) characteristic curves. The short-circuit photocurrent (Isc), the open circuit photovoltage (Uoc), the fill factor (FF) and the efficiency (η) are linearly dependent on the temperature. The temperature coefficients (T-coefficient) relative to the short-circuit, open-circuit photovoltage and efficiency are calculated and the comparison with data from the literature showed the accuracy of the considered model.

关键词： Polycrystalline Solar Cell Junction Recombination Velocity Temperature

Study and Optimization of a Photovoltaic Mill System Functioning on the Course of the Sun

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Energy and Power Engineering 2017年第4期9卷 260-272页

作者： Tafsir Abdoulaye Gaye Biram Dieng senghane mbodji Ousmane Sow Grégoire Sissoko Department of Physics UFR Applied Sciences and Information and Communication Technologies Alioune Diop University of Bambey Bambey Senegal Universitary Institute of Technology University of Thies Thies Senegal Department of Physics Faculty of Science and Technology Cheikh Anta Diop University of Dakar Dakar Senegal

This paper dealt with the optimization of the performance of a photovoltaic mill system operating on the sun race. Depending on the characteristics of the powered load which is a DC motor driving a grain mill and on the weather conditions (temperature and illumination), we noted a very big difference between the potential maximum power and that actually transferred to the load. In order to improve the overall efficiency of the system, we use an adaptation circuit consisting of a boost converter controlled by a numerical MPPT (Maximum Power Point Tracking) command. With the Perturb & Observe (P & O) algorithm, the MPPT control measure the photocurrent, the photo tension and the power released by the photovoltaic generator. From this result, the MPPT control adjusts the duty cyclic of the converter to bring the system to the optimum operating point. Hence, using MATLAB/Simulink software, we did the modeling and the simulation of the system which is composed by a PV generator, a boost converter, a Pulse Width Modulation and a DC motor.

关键词： PV Generator Boost Converter PWM Signal MPPT Control Perturbation & Observation DC Motor Mill

Experimental Processus for Acquisition Automatic Features of I-V Properties and Temperature of the Solar Panel by Changing the Operating Point

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Circuits and Systems 2016年第11期7卷 3984-4000页

作者： Babou Dione Ousmane Sow Mamadou Wade L. Y. Ibrahima senghane mbodji Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal University Institute of Technology University of Thiès Thiès Sénégal Polytechnic School of Thiès Thiès Sénégal Université Alioune DIOP de Bambey Bambey Sénégal

A development of an acquisition of the characteristic of a solar panel by automatic load variation system is put into play and coupled to an instrumentation chain for taking account of temperature. A programmed digital microprocessor control enables this automation. Design and implementation of a device for automation of variations of the resistive load are powered by solar panel. It is provided by a PIC 16F877A running a computer program that we have developed on the basis of an algorithm according to the operation that we have set. By varying automatically the resistive load, we were able to automatically acquire the characteristic I-V and temperature of the solar panel. With automatic combinations of the 10 resistors, we have obtained 1024 measures of the characteristic curve of the solar cell which has a good accuracy. The change in load and temperature measurement allows us to have the characteristic curves parameterized by temperature.

关键词： Microcontroller Solar Panel Temperature I-V PIC 16F877A

Temperature Effect on Capacitance of a Silicon Solar Cell under Constant White Biased Light

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World Journal of Condensed Matter Physics 2016年第3期6卷 261-268页

作者： Ibrahima Diatta Ibrahima Ly Mamadou Wade Marcel Sitor Diouf senghane mbodji Grégoire Sissoko Physics Department Faculty of Sciences and Techniques University of Cheikh Anta Diop Dakar Senegal Electromechanical Engineering Department Polytechnic School of Thies University Thies Senegal University of Alioune DIOP Bambey Senegal

In static regime with polychromatic illumination, using the expression of the solar cell capacitance to determine the silicon solar cell capacitance C0(T) in short-circuit, is the purpose of this article. The expression of the excess minority carries density δ(x) from the continuity equation. The expression of δ(x) is used to determine the photovoltage expression. The capacitance efficiency dependence on Xcc(T) is studied. Xcc(T) is the abscissa of the maximum of δ(x).

关键词： Solar Cell Capacitance Temperature