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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 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,...
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...
Several studies have been presented regarding the harmonics mitigation by using different types of filters. Passive filter is one of them and is employed due to his simplicity, economical cost and high reliability in power system. This paper presents an analysis and study of three types of passive filters to minimize harmonics distortion caused by non linear loads in standalone PV system. In order...
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