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Recently, great attention has been addressed for multilevel inverters, as they exhibit low total harmonic distortion in the output voltage and low electromagnetic interference. In this paper a new configuration of three-phase multilevel voltage source inverter is presented. This structure consists of series-connected sub-multilevel inverters blocks. The number of utilized switches, insulated gate...
In this paper a thermodynamic optimization of flat plate solar collector is developed to determine the optimal performance. In fact the energetic and exergetic analyzes are achieved by the determination of tow efficiencies. The influence of some geometrical parameters on the performance is also studied. It is noted that the exergetic efficiency of the collector has an optimum and that the energetic...
The elimination of transformer in solar inverter has reduced the size, weight and losses in the photovoltaic (PV) systems. But, the galvanic connection between PV module and the grid generates leakage current through the parasitic capacitance. This paper presents a new high efficient transformerless SepCuk inverter topology using a common grounding between the grid and PV module to meet the requirements...
The computer simulation tool Analysis of Microelectronic and Photonic Structures (AMPS-ID) was employed. This work investigates the effects of a band-gap grading profile close to the linear in the region close to the junction Copper-Indium-gallium-deselenide (CIGS) based solar cell performance for a constant values of front band-gap (Egfront) and d (width of the forward grading) equal to 1.28 eV and...
Copper supported on calcined hydrotalcite catalysts were prepared using the memory effect of zinc-aluminium hydrotalcite. Zinc-aluminium was calcined at 400°C and dopped in a copper nitrate aqueous solution for surface hydrotalcite regeneration. The calcination at 500°C of the sample copper/zinc-aluminium (Cu/Zn-Al) (400) leads to an interesting copper mixed oxide supported on calcined hydrotalcite...
The present study is concerned by the exploration of the capability of natural and synthetic adsorbents to retain methyl orange dye. The effect of key operating parameters such as contact time, adsorbent dosage, initial pH and initial dye concentration on retention capacity, were investigated for these adsorbents. Various isotherm models like Langmuir and Freundlich were tested for the adsorption...
The use of wind energy has developed significantly worldwide. Wind power is the strongest growing form of renewable energy, ideal for a future with pollution-free electric power. But the intermittent nature of wind makes it difficult to forecast. The researchers have embarked on use of the Multi-Layered Perceptrons (MLP) neural networks and other architectures of neural networks for predicting the...
The present work is aimed at exploring carbon which was prepared by calcination of Cereal By-Product (CBP) and used as adsorbent for the removal of Chromium (VI) from a surface treating industry. The effect of various parameters such as adsorbent dosage, particle size, pH, contact time and stirring speed was studied. As the adsorption process is pH dependent, it showed maximum removal efficiency of...
This paper presents a Bilinear FSP-SPC to control the outlet temperature of a solar collector field. The process have a dead-time caused by multiple factors and requires an advanced control techniques to be controlled. This algorithm combines the numerical robustness typical of subspace-based methods with the robustness and performance of filtered Smith predictor based controllers. It uses a bilinear...
This paper presents a domestic solar heating unit with high level of automation, specially designed to reduce energy consumption in Brazilian residences, where almost 25% of electrical energy is spent to heat water for bathing. The system is composed basically by solar plates, a boiler and an electric shower. Automatic valves and power controllers are used to regulate the temperature and flow during...
A two dimensional model is developed for the partial oxidation and reduction zones of a downdraft gasifier. The model is based on the conservation laws of mass, energy and momentum coupled to the chemical kinetics. The predicted results are compared with experimental data obtained from a pilot scale downdraft gasifier fueled by almond shell and a reasonable agreement is found The model is used to...
The electrochemical properties of LaY2Ni9 hydrogen storage alloy have been studied through chronopotentiometric, chronoamperometric and cyclic voltammetry measurements. At the C/5 rate the maximum capacity is obtained after 5 cycles of activation and reached 224 mAh g−1, the discharge capacity loss (ratio of the discharge capacity at a given cycle n by the maximum discharge capacity) tends to 46%...
Power generation of photovoltaic panels (PVP) depends mainly on the cell temperature (T) and the solar irradiance (G). Moreover, for a given climatic condition, the operating point is sensitive to the PVP connected load. To enable the PVP to generate the maximum of available power, many maximum power point trackers (MPPT) algorithms are developed. This paper presents an assessment of four main used...
Initiatives to use, in single or hybrid configurations, solar collectors, photovoltaic panels and wind turbines require an approach of such technologies as an integral part of the organic whole of the built environment, in which quality, in their objective or subjective aspects, includes a range of specific social-environment variables. These variables must be deeply associated with the equipment...
We present in this paper a software simulation system with interactive graphic interface for solar systems designed with Matlab-Simulink. In the first part, the system is able to model the five different types of cells / solar modules appear by the characteristics, current-voltage (I-V) and power-voltage (P-V) under different external conditions such as solar irradiance and temperature ambient and...
Recently, Flexible AC Transmission System (FACTS) — based devices have been used for power flow control and for damping power system oscillations. They can also be used to increase transmission line capacity; steady state voltage regulation; provide transient voltage support to prevent system collapse; and damp power oscillations. FACTS devices can be used in wind power systems to improve the transient...
In this paper modelling and analysis of self excited dual stator winding induction generator (DSWIG) with a new method ‘fzero algorithm’ has been done. We develop the steady-state model of a dual three self-excited induction generator for stand-alone renewable generation dispenses with the segregating real and imaginary components of the complex impedance of the induction generator. Steady state performances...
A cost effective thermal storage system is required for the sustainable operation of parabolic trough solar power plants using synthetic oil as the heat transfer fluid in the solar field. Latent heat storage has the advantage of higher performance and lower material inventory. However, potential materials for use have low thermal conductivities leading to low utilization factors. The use of fins was...
During the last years wind energy has experimented a significant growth in comparison with other types of renewable energy sources. Accordingly, the number of wind farms has increased sharply to become one of the most developed worldwide infrastructures. Unfortunately, the high number of constraints and restrictions that must be considered nowadays when designing a wind farm deployment (e.g. protected...
This study is within the framework of the promotion of solar energy, environmental protection and energy conservation. It is among the works that are intended for the use of solar energy for the production of energy to buildings by the use of photovoltaic and thermal hybrid collectors (photovoltaic/thermal). The finite volume method is used. Also, a change of coordinate is adopted to pass the physical...
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