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Search Results: 1 - 10 of 18 matches for " Senghane Mbodji "
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Modelling Study of Magnetic Field’s Effects on Solar Cell’s Transient Decay  [PDF]
Senghane Mbodji, Martial Zoungrana, Issa Zerbo, Biram Dieng, Gregoire Sissoko
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.54029
Abstract: 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.
A 3D Modelling of Solar Cell’s Electric Power under Real Operating Point  [PDF]
Mayoro Dieye, Senghane Mbodji, Martial Zoungrana, Issa Zerbo, Biram Dieng, Gregoire Sissoko
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.54028
Abstract: 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.
Temperature Effect on Capacitance of a Silicon Solar Cell under Constant White Biased Light  [PDF]
Ibrahima Diatta, Ibrahima Ly, Mamadou Wade, Marcel Sitor Diouf, Senghane Mbodji, Grégoire Sissoko
World Journal of Condensed Matter Physics (WJCMP) , 2016, DOI: 10.4236/wjcmp.2016.63024
Abstract: 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).
Experimental Processus for Acquisition Automatic Features of I-V Properties and Temperature of the Solar Panel by Changing the Operating Point  [PDF]
Babou Dione, Ousmane Sow, Mamadou Wade, L. Y. Ibrahima, Senghane Mbodji, Gregoire Sissoko
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.711330
Abstract: 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.
Study and Optimization of a Photovoltaic Mill System Functioning on the Course of the Sun  [PDF]
Tafsir Abdoulaye Gaye, Biram Dieng, Senghane Mbodji, Ousmane Sow, Grégoire Sissoko
Energy and Power Engineering (EPE) , 2017, DOI: 10.4236/epe.2017.94018
Abstract: 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.
Analysis of T-Coefficients Using the Columnar Cylindrical Orientation of Solar Cell Grain  [PDF]
Serigne Ndiangue Leye, Ibrahima Fall, Senghane Mbodji, Papa Lat Tabara Sow, Gregoire Sissoko
Smart Grid and Renewable Energy (SGRE) , 2018, DOI: 10.4236/sgre.2018.93004
Abstract: 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.
3D study to improve the IQE of the bifacial polycrystalline silicon solar cell from the grain’s geometries and the applied magnetic field
MOMAR DIAW,Bernard Zouma,AHMETH SERE,Senghane Mbodji
International Journal of Engineering Science and Technology , 2012,
Abstract: A study aiming to an improved internal quantum efficiency of silicon solar cell is presented. The efficiency depends on several internal and external parameters. Especially the polycrystalline silicon solar cell, which is the most used for the terrestrial applications of photovoltaic solar energy, has the lowest efficiency. Because there are many grains and grain boundaries with much recombination of the carriers at the grain boundaries, thus the structure of the grain as its geometry becomes an internal key parameter for this efficiency.The external key parameter taken into account here is the magnetic field. Although its effect on the carriers is well known, its impact on the recombination’s phenomena into the two different regions of the cell like the emitter and the base needs to be known. Before doing it, two classical geometries of the grain are retained toinvestigate through simulation an adequate structure providing a high efficiency. Thus an appropriated 3D model with new assumptions is used to describe the bifacial polycrystalline silicon solar cell and new expressions of carrier densities, photocurrent and quantum efficiency are established.
Time consistent portfolio management
Ivar Ekeland,Oumar Mbodji,Traian A. Pirvu
Mathematics , 2010,
Abstract: This paper considers the portfolio management problem of optimal investment, consumption and life insurance. We are concerned with time inconsistency of optimal strategies. Natural assumptions, like different discount rates for consumption and life insurance, or a time varying aggregation rate lead to time inconsistency. As a consequence, the optimal strategies are not implementable. We focus on hyperbolic discounting, which has received much attention lately, especially in the area of behavioural finance. Following [10], we consider the resulting problem as a leader-follower game between successive selves, each of whom can commit for an infinitesimally small amount of time. We then define policies as subgame perfect equilibrium strategies. Policies are characterized by an integral equation which is shown to have a solution. Although we work on CRRA preference paradigm, our results can be extended for more general preferences as long as the equations admit solutions. Numerical simulations reveal that for the Merton problem with hyperbolic discounting, the consumption increases up to a certain time, after which it decreases; this pattern does not occur in the case of exponential discounting, and is therefore known in the litterature as the "consumption puzzle". Other numerical experiments explore the effect of time varying aggregation rate on the insurance premium.
Analysis of the Diffusion Capacitance’s Efficiency of the Bifacial Silicon Solar Cell in Steady State Operating Condition
S. Mbodji,B. Mbow,I. Zerbo,G. Sissoko
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: The aim of this study is to study the diffusion capacitance’s efficiency of the n+-p-p+ bifacial solar cell. The dependence of the efficiency of the diffusion capacitance on both the excess minority collection region in open circuit and short-circuit operating points of the solar cell has been itemised for varying grain size (g), grain boundary recombination velocity (Sgb), wavelength (λ) and illumination mode (front side and both front and rear sides). It is shown that the diffusion capacitance’s efficiency which increases with grain size (g) and both front and rear sides illumination mode and decreases with grain boundary recombination velocity (Sgb) and higher wavelength (λ) can be linked to the conversion efficiency of the solar cell.
E. SOW,S. MBODJI,B. Zouma,M. Zoungrana
International Journal of Science, Environment and Technology , 2012,
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