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At the early stage of photovoltaic plants feasibility study, the assessment of the power production and the technology performances is a necessity. To do so, engineers usually use software’s and prediction models. Plenty of models are available in the literature, nevertheless, the selection of the most suitable one to be use in a specific climate is a hard task since no study deals with the inter-comparison...
The progress of Variable Speed Wind Turbine Systems (VS-WTS) is currently focused in reaching higher power ratings (8MW). Also, medium voltage operation is at this power level, particularly at electrical network, a required feature. Consequently, high power medium-voltage multilevel converters for VS-WTS have been attracting more and more attentions. Nevertheless, most modern high-power VS-WTS consist...
This study proposes a control system design for Electrical Network Connected Wind Farm (ENCWF) using Direct Drive Permanent Magnet Synchronous Generator (DD-PMSG). The generators are connected to the power network by Voltage Source Converter (VSC) with a dc-link. The proposed scheme is based on Backstepping technique and regulates the powers exchanged between the ENCWF and the electric network to...
In this paper we present the study of a hybrid photovoltaic/thermal panel (PV/T). It consists of a sheet form with several inputs-outputs opening (I/O) of coolant fluid, confined between the rear face of the panel and a Plexiglas support plate. The system is designed to maintain the temperature of the PV panel near ambient temperature. Heat transfer through the components of PV/T collector, taking...
Magnesium alloys have a high mechanical rigidity and an extremely low density. They attract car manufacturers to meet the standards US EPA CAFE (Corporate Average Fuel Economy), and to replace many materials, such as copper alloys, cast irons and steels, and also aluminum alloys. Recently, mechanical and thermal properties of magnesium alloys with rare earth elements and Zn have been studied in scientific...
In this work we propose a 3D reconstruction of a defect that exists in the inaccessible side of a material by an artificial neural network. We used a neural network that contains a single hidden layer with the sigmoid activation function to treat the standard thermal contrast deduced from the pulsed infrared thermography data. Three different data sets were used in the learning phase. The use of standard...
Resolution approach of an inverse problem by lock-in thermography was developed for research geometric and thermal properties of internal defects, which are found in composites (CFRP), as depth, size, thermal conductivity and heat capacity. We have developed a new hybrid algorithm that uses the adaptive simulated annealing algorithm and the generalized patterns search algorithm to calculate the depth,...
In this work we have developed a model to determine the thermal effusivity of the defects that occur in steel. We used a non-destructive pulsed thermography to know the thermal properties of defects, which need certain industrial sectors. On the basis of a solution of the heat equation in one dimension, and using the finite element method; we calculated by simulation the surface temperatures of defective...
The infrared thermography technique developed in the present study was successfully applied to determine the scale thicknesses in the steel pipe. By finite element method we have calculated the infected pipe surface temperature. We have developed a model for estimation the thickness scale on the inner surfaces pipe. Pipe dimensions and scale layer are taken as geometrical parameter. We have studied...
This study presents a control scheme of the electronic interface of a grid connected Variable Speed Wind Energy Generation System (VS-WEGS) based on a Permanent Magnet Synchronous Generator (PMSG). The proposed system consists of wind turbines (WT) and 2 PMSGs connected to the electric network by back-to-back Voltage Source Converter (VSC) with a common dc-link. The generator-side converters are employed...
In this paper, our work consist to identify the parameters of both complete (5-parameter) and simplified (4-parameter) single-diode PV models by non-iterative and iterative methods. The objective is to predict the behavior of a Thin-Film module under real environmental conditions. A new parameter Series/Parallel Ratio (SPR) ranking photovoltaic modules is defined. According to the value SPR, we can...
Mathematical modeling of photovoltaic (PV) modules is essential for any performance optimization operation or diagnostic of the photovoltaic generator under changing environmental conditions. The limited data available are provided by commercial manufacturing datasheets. The accurately estimating of these parameters remains a challenge for researchers. There is great diversity in the models and the...
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