Contribution à l’étude théorique du comportement d’un système hybride (éolien- photovoltaïque- diesel) de production d’électricité sans interruption

Actuellement, Le générateur diesel est la technique la plus utilisée pour l’électrification des sites isolés. Néanmoins, l’accès à ces sites étant généralement long et difficile, les coûts de maintenance et d’approvisionnement en carburant sont très élevés. En conséquence, nous avons envisagé de coupler – au sein d’un système hybride - un générateur diesel avec deux sources d’énergies renouvelables (éolien-photovoltaïque) qui représente alors souvent l’option la plus économique. Cependant, notre étude porte sur l’alimentation d’une habitation, qui peut être situe sur différents sites Algériens, par le système hybride avec stockage électrochimique. Dans un premier temps, nous nous sommes basés sur la modélisation détaillée des composantes du système, puis sur l’ensemble du système. Ainsi, nous avons appliqué les modèles et dimensionner le système ce qui nous a permis d’aboutir aux meilleures performances.Mots-clés : système éolien, système photovoltaïque, générateur diesel, systèmehybride, système de stockage, la charge, dimensionnement

Hybrid Options Analysis for Power Systems for Rural Electrification in Algeria

AbstractAdrar, Djelfa, Illizi and Djanet, are the most rural zones in Algeria where grid connected electric system for the inhabitants will not be possible to establish even in future. Diesel is the main fuel for fulfilling the energy demand. Solar and Wind resources are the hybrid options for these four sites. HOMER, a software for optimization of renewable based energy efficient system for different numbers of households- 1, 20. It shows that per unit (kWh) cost of energy varies from 1.49, 2.46, 1.84 and 4.1 USD to 1.19, 2.16, 1.33, and 1.52 USD respectively for: Adrar, Djelfa, Illizi and Djanet.. On the other hand it's revealed too that the energy cost depends largely on the renewable energy potential quality (Adrar: 1.19 USD and Djelfa 2.16 USD)

Economic and environmental analysis for grid-connected hybrid photovoltaic-wind power system in the arid region

AbstractIn this paper, an investigation is made on large-scale operations of 95 MW per day hybrid renewable energy system (HRES) as a grid power generation consisting of solar and wind energy. A comparison is drawn between a grid-connected HRES and a standard grid operation focusing on environmental and economic impacts. Emissions and the renewable energy generation fraction (RF) of total energy consumption are calculated as the main environmental indicator. Costs including net present cost (NPC) and cost of energy (COE) are calculated for economic evaluation. To simulate the HRES, the hourly mean global solar radiation, temperature and wind speed data from Adrar (27.59°N, 0.11°W) of Algeria, are used as an example of a typical arid climate. HOMER is used for simulation. It is found that the optimum results of HRES show a 22% reduction of emissions including CO2, SO2 and NOx. The RF of the optimized system is 22%. It is also found that the reduced NPC and COE are only equal to about 99% of energy consumption from standard grid. In addition, through a set of sensitivity analysis, it is found that the wind speed has more effects on the environmental and economic performance of a HRES

Economic and technical study of a hybrid system (wind-photovoltaic-diesel) for rural electrification in Algeria

This paper deals with design of hybrid energy system consisting of wind and photovoltaic with battery storage. A diesel generator is added to ensure continuous power supply and to take care of intermittent nature of wind and photovoltaic. The paper reports results of the technical-economic optimization study of photovoltaic/wind/diesel hybrid with battery storage in Algeria. The primary objective of this study is to estimate the appropriate dimension of stand-alone hybrid photovoltaic/wind/diesel with battery storage that guarantee the energy autonomy of typical remote consumer with lowest cost of energy. A secondary aim is to study the impact of renewable energy potential quality on the system size. The optimum dimensions of the system are defined for six sites in Algeria. In this context, a complete sizing model is developed in Matlab/Simulink V.6.5, able to predict the optimum system configuration. The simulation results indicate that the hybrid system is the best option for all the sites considered in this study. Thus, it provides higher system performance than photovoltaic or wind alone. It s shown that the principal advantage of photovoltaic/wind/diesel hybrid with battery storage are used all together, the reliability of the system is enhanced. The economic analysis has resulted in the calculation of kWh cost of energy for different types of resources and optimized cost of hybrid energy system. It s revealed too that the energy cost depends largely on the renewable energy potential quality. So, our objective for the optimization parameters is not the production cost but the offered service.Hybrid systems Modelling Simulation Rural electrification

Simulation of offshore wind turbine link to the electric grid through a four-level converter

This paper is on the modulation of offshore wind energy conversion systems with full-power converter and permanent magnet synchronous generator with an AC link. The drive train considered in this paper is a threemass model which incorporates the resistant stiffness torque, structure and tower, in the deep water, due to the moving surface elevation. This moving surface influences the current from the converters. A four-level converter is considered with control strategies based on proportional integral controllers. Although more complex, this modulation is justified for more accurate results

Sun Tracker Systems Effects on Flat Plate Photovoltaic PV Systems Performance for Different Sky States: A Case of an Arid and Hot Climate

AbstractThis work aims at determining the most appropriate sun tracking system. The effect of using different types of sun tracking systems on the flat plate photovoltaic system performance for different sky states has been investigated. Several days representing different seasons have been considered. The corresponding main parameters affecting the amount of the electrical energy output and the gains have then been compared to those experienced with two traditional fixed photovoltaic systems inclined according to a yearly and a seasonal optimum slope. Additionally, five configurations of sun tracking systems have been considered while a seasonal and a yearly optimum slope have been applied to those based on rotating axes systems. Hourly data collected over thirty one days for different seasonal sky conditions have been employed. The daily collected global solar radiation and produced electrical energy as well as the electrical gains related to the different moving panels have been quantified separately for each sky state. It is found that for a completely clear day, the highest obtained gains are those related to the two-axis sun tracker systems while the day length is the main parameter affecting these gains. On the other hand, for the partially clear days, the gain amounts mainly depend on the daily clarity level factors and on the seasonal variation of day length values. For a cloudy day, however, all considered systems produced the same electrical energy. Furthermore, the horizontal position of the photovoltaic panel presented the best performanc

Sun Tracking Mechanism Effects on Flat Plate Photovoltaic System Performances for Different Step Time and Main Parameters Affecting the Obtained Gains: Case of North Africa and Mediterranean Site

AbstractThis work is performed to investigate the effect of using different types of sun tracking mechanisms on the flat plate photovoltaic system performances and the main parameters affecting the amount of their output electrical energy as well as those affecting their gains compared to the traditional fixed photovoltaic systems. The evaluation of different systems has been performed on the basis of hourly measured data over a complete one year obtained from Bouzareah location (Mediterranean coastal site). Considering all sky states, the monthly and yearly produced electrical energy by each one of the considered systems as well as the electrical gain of the photovoltaic panel mounted on different sun tracker systems were evaluated. From these latter, it appears that the highest gains obtained are those related to the two axes sun tracker system, which decrease gradually, from the inclined to the vertical rotating axis if the same optimum slope scheme is considered and from seasonal to the yearly optimum slope if the same rotating axis scheme is considered. So, from the obtained results, appears that if also, all sky states conditions were considered, compared to the single axis sun tracking systems, the gain obtained by the two-axis sun tracking system is relatively low and don’t exceed three percent for some cases. On the other hand, is also observed that the quantity of electrical energy produced by the different systems follows a seasonal variation and mainly related to the sun tracker mechanism under consideration, the choice of the panel slope, the availability amount of solar irradiation amount mainly the normal direct component, the day length and from the seasonal variation of the weather conditions