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In this study, we investigated the effect of the chemical ratios (x=Ga/In+Ga) on the structural and optical properties of the chalcopyrite Cu(Inx−1, Gax)S2 thin films made by spray pyrolysis. Structural analysis by X-ray diffraction revealed that the CIGS crystallizes in a polycrystalline structure with chalcopyrite phase and a preferential growth orientation [112]. The best crystallinity was observed...
This paper investigates the effect of emissivity on the thermal performance of a double wall façade with a closed cavity (DWF). A transient simulation was performed under real conditions of solar radiation and ambient temperature in Rabat. The governing equations are solved using finite element method with COMSOL Multiphysics considering air flow of the cavity and heat transfer by conduction, convection,...
This paper deals with the problem of the constant-power operating envelope at high speed in the wind energy conversion systems. The considered aero-generator involves a hybrid excitation synchronous generator (HESG). To operate at constant-power, it is recommended to use a feedback flux-weakening control, the hybrid excitation circuit is compatible with the extended-speed-range constant-power operation,...
The majority of work carried out around battery models is partly motivated by vehicle simulation. Specifically for electric vehicle simulation, some characteristics of the battery require more attention while others can be simplified, thus distinguishing dynamic models for battery system simulation slightly and requiring different tools. In this paper, we propose a dynamic battery model that accounts...
To avoid load peaks periods and reduce the electricity bill price, it is necessary to jeopardize appliances models and requirements. That allows controlling equipment energy needs and customizing the global home consumption profile. This paper gives smart home appliances modeling aiming to generate their energy power profiles according to local environmental circumstances. Moreover, the proposed models...
The purpose of this study is to analyze the energy behavior of a solar oven box-type with four reflectors inside and outside and with thermal storage. To achieve this work, we have modeled the equations of heat balances transient by numerical simulation by using Matlab (the method of runge-kutta of order 4). Hence, we were able to determine the temperature profiles in different parts of the oven as...
in In this work, we study the effect or the different copper precursors on the structural optical and electrical properties of CuO thin films deposited on glass substrates using spray pyrolysis technique, the phase of tenorite (CuO) are identified using X-Ray diffraction. A single phase without impurities is observed for the three precursors. The band gap energy and others optical parameters are calculated...
In the last years, kesterite based solar cells have achieved conversion efficiencies that although relatively low, are very attractive for the photovoltaic industry. The main efficiency limitations are related to the complexity of this material, and into a large extent are linked to the uncontrolled formation of grain boundaries and their nature. In this work we present an innovative approach based...
This paper presents the thermal behavior of a passive building located in Hassan II University of Casablanca. A numerical code based on electric analogy nodal method was developed and validated against experimental results. This program is used to validate estimated values of envelope thermal resistances for three configurations (Case 1: cell without insulation; Case 2: 4.5 cm of glass wool layer...
Recently, the squirrel cage induction generators have been widely employed to operate in small hydroelectric generators and wind turbine generators of isolated power system. This paper presents experimental results using dSPACE board of Self Excited Induction Generator (SEIG) when the capacity value, the speed rotor and load changes. The voltage value of the SEIG terminal is not constant but she is...
Performance of SnS based photovoltaic solar cell is described in this research paper on the base of its numerical analysis. Cell structure consists of following sequence (p-SnS/CdS/Zno) for absorber layer, buffer layer and optical window, respectively. The numerical analysis is carried out by Photovoltaic cell Capacitance Simulator Software (SCAPS). After optimization of different parameters of the...
Thin films of Tin oxide doped with deferent concentration of Sulfur were prepared on glass substrates at 400 °C by spray pyrolysis technique. The thin films were characterized to study their physical properties. Effects of Sulfur concentration on structural, optical and electrical properties of transparent Tin Oxide thin films were investigated in the Sulfur content range (0–10) at%. It was observed...
In this paper a supervision system based on the proportional distribution algorithm is developed, for a large wind farm based on the squirrel cage asynchronous generator (SCAG), associated with the maximum power point tracking (MPPT) and the PQ control. The MPPT control mode is used to extract the maximum power from the wind and the PQ control is used to inject the required active and reactive power...
The photon upconversion phenomenon was suggested in the past as a potential process to enhance the efficiency of photovoltaic cell. The two most accepted processes responsible of this phenomenon in several host materials like fluoride are the Ground State Excitation (GSA) and Energy Transfer (ETU). In this work, we present the synthesis and preparation of Tin dioxide (SnO2) co-doped Er3+/Yb3+ trivalent...
in this study, three models namely the linear coefficient model, the Standard ASTM E2527 and the Sandia National Laboratories model, among some methods of the prediction of maximum power have been adequately selected to investigate the performance of a High concentrator photovoltaic (HCPV) system, upon atmospheric conditions such as the direct normal irradiation DNI, the ambient temperature, the wind...
In this paper, the different types of concentrating solar power plants are illustrated with the materials employed for the matter, the heat transfer fluids categories employed, in addition to the thermal storage possibilities that all depend on the working temperature of each plant. Furthermore, the accelerated ageing tests operated on these materials are discussed.
This paper presents the modeling, simulation and control strategy of a hybrid power system (HPS) integrating a wind energy conversion system (WECS), a solar photovoltaic system (SPV) and a biodiesel generator (BDG) as well as a storage battery designed to ensure power reliability under all various weather conditions. The model includes wind turbine, photovoltaic panels, permanent magnet synchronous...
One of the main power quality problems, created in power system, is related the current harmonics generated by nonlinear loads and power electronic equipment. To minimize these effects, different types of compensators have been proposed to increase the electric system quality. Active Power Filter is one of those compensators. This paper deals with the configuration, design, control, and algorithm...
In this paper, we have studied numerically thermal performances of a parabolic trough collector (PTC) working with different nanofluids. Simulations are carried out for 5% nanoparticles' volume concentration. The ultrafine particles that have been suspended in the base fluid (Syltherm800) are the aluminum oxide (Al2O3), the copper (Cu), the cupric oxide (CuO) and the silver (Ag). The results show...
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