http://hdl.handle.net/STDB_UNAM/190 2026-04-18T10:35:16Z http://hdl.handle.net/STDB_UNAM/521 MPPT Technique Based on Neural Network for Photovoltaic System Elhor, Abderrahmane The using of an efficient MPPT (Maximum Power Point Tracking) algorithm influences a lot in the global efficiency of the PV system. This thesis presents a detailed study based on simulation of different MPPT algorithms with their features using two systems (off-grid and on-grid). The off-grid system contains a PV array connected to a boost converter and a resistive load. On the off-grid system a simulation is presented using MATLAB/SIMULINK platform with several MPPT algorithms. The simulated MPPT algorithms are the conventionals Incremental Conductance (IncCond), Perturb and Observe (P&O), Open Circuit Voltage (OCV) and a new developed Neural Network (NN) under different environmental conditions of temperature and irradiance. As a result of the simulation, the NN algorithm has a quick response, i.e, it requires less time to reach the MPP and high efficiency and less oscillation comparing with the conventional methods. On the other hand, a single-phase two-stage photovoltaic grid-connected system is simulated which contains a PV array, a boost converter, a dc link capacitor, an inverter, an output L filter and the utility grid. In that system a control of dc link voltage, the injected current and the MPPT is made. Another MPPT algorithm based on NN (modifiedNN) was also established. Showed later that is the most suitable for the system. The maximum of power is achieved when the irradiance is maximal and the temperature is minimal. Finally, a study of the influence of the variation in the climatic conditions on the output performance of the system is done. 2021-01-01T00:00:00Z http://hdl.handle.net/STDB_UNAM/252 Gestion intelligente de charge et de décharge de batteries pour un système photovoltaïque relié au réseau. BENTRAR, Mohamed; CHAOUCHE, Hibet Errahmen Ce mémoire est consacré à une technique de gestion de charge et de décharge de batteries dans un système photovoltaïque relié au réseau. Ladite technique consiste à choisir entre deux stratégies de gestion de stockage : la première se limite à écrêter des pics de consommation lorsque la production d'énergie photovoltaïque est faible et n'arrive pas à couvrir la charge électrique, alors que la seconde, appliquée lorsque la production de l'énergie photovoltaïque est abondante, vise à adopter des pro ls de décharge adaptés aux restrictions de charge et décharge des batteries a n d'éviter leur endommagement rapide. La gestion intelligente de charge et de décharge des batteries permet d'assurer une longue durée de vie des batteries et une bonne exploitation de l'énergie produite par le générateur photovoltaïque et même à vendre l’excès d'énergie au réseau. 2021-09-27T00:00:00Z http://hdl.handle.net/STDB_UNAM/246 Optimizing the magnetic heat exchangers of thermomagnetic motors: A heat transfer study SAOUD, ROUMAISSA This work explored the optimization procedures of heat ex- changers to be used in thermomagnetic motors. The article main focus is the use of CFD simulations to maximize the heat exchange rate between the magnetic materials and the hot and cold fluids. This is done in order to have the maximum possible operational frequency in thermomagnetic motors. This was accomplished by optimizing the geometries of the channels of the heat exchangers. As the focus of this work was to improve the thermo- magnetic heat exchangers geometrically, some important characteristics were observed. First of all, taking into account the fact that the heat transfer rate is highly influenced by the contact area between the fluid and the plate, and that the length of the plate is constant and depends on constructive characteristics of the motor, we have that, in order to improve the heat transfer speed, the perimeter of the channels must be increased. In this work only channels having convex cross section formats were considered, but the use of channels with concave cross section may lead to higher contact areas and therefore improve even more the heat transfer rate. Another very important aspect is that the temperature gradient along the plate needs also to be taken into account, because the magnetic force distribution applied on the plates is perpendicular to its linear displacement, so this gradient can lead to some misalignment of the force on the plates leading to the blockage of the motor; in this sense we showed that the best option to maximize the temperature homogeneity is the use of a non-uniform cross section in the channels. Future works shall be developed considering the real properties of the magneto-caloric materials for the simulations, which will allow the use of the CFD simulations together with magnetic simulations to determine the dynamics of thermomagnetic motors and also their efficiencies. 2021-09-29T00:00:00Z http://hdl.handle.net/STDB_UNAM/245 The importance of magnetic forces on the performance of turbines and heat exchangers SAOUD, ROUMAISSA Magnetic energy has been used in this research for the treatment of turbine fuel, to reduce consumption, increase efficiency as well as to reduce the emission of certain pollutants. Our study included the use of magnetic coils with different intensities, which were installed around the combustion chamber and to study their impact on the fuel consumption, as well as on the exhaust gases. In order to be able to compare the results, it was necessary to carry out experiments without the use of magnets. The impacts of magnetic field enhancement on low-octane fuel in the combustor of an MS5002C turbine were investigated. The result of this study indicates that magnetic field enhancement can improve the level of completion of the combustion process by increasing the chances of reaction between hydrocarbon molecules and oxygen. The increased reaction between hydrocarbon molecules and oxygen is due to the weakening of bonds, accompanied by an increase in molecular vibrational energy. Based on the results of the investigation and characterization carried out, it is necessary to optimize the design of the magnetic field sources both in terms of geometry and type of source (use of permanent magnets or coils). Optimization of the location of the magnetic resources in the system must also be carried out to make it technically feasible. In addition, further studies are needed on the long-term impacts of magnetic field exposure on combustion performance. 2021-09-29T00:00:00Z