Showing papers by "Georges Barakat published in 2007"
01 Sep 2007
TL;DR: In this article, a new methodology developed to design a hybrid wind/photovoltaic (Wind/PV) system, is presented based on an optimization process using a deterministic algorithm, the developed methodology helps the authors to obtain the optimal number and type of PV panels, wind turbines and storage units ensuring that the system total cost is minimized while guaranteeing the permanent availability of energy to cover the load energy requirements.
Abstract: In this paper, a new methodology developed to design a hybrid wind/photovoltaic (wind/PV) system, is presented Based on an optimization process using a deterministic algorithm, the developed methodology helps the authors to obtain the optimal number and type of PV panels, wind turbines and storage units ensuring that the system total cost is minimized while guaranteeing the permanent availability of energy to cover the load energy requirements The hybrid system configuration and modeling are presented and the used deterministic algorithm (DIRECT algorithm) is described and implemented in MATLAB environment to optimize the hybrid wind/PV system
49 citations
01 Sep 2007
TL;DR: In this article, a model based on permeance network method (PNM) was proposed for the simulation of faulty induction machines, which allows the authors to take into account the local magnetic saturation and remains moderately time consuming compared to the finite element method.
Abstract: Electrical machines diagnosis needs a modelling approach reliable and as close to the reality as possible. It is shown that by proper modelling of the induction machine it is possible to detect the effect of the different faults on the machine current and vibrations. This paper proposes a model based on permeance network method (PNM) for the simulation of faulty induction machines. The PNM allows the authors to take into account the local magnetic saturation and remains moderately time consuming compared to the finite element method. The developed permeance network of the machine is coupled to the stator phase electrical equations on one side and, on the other side, to the mechanical motion equation in order to simulate variable speed operations. The air-gap eccentricity is then taken into account in the modelling of the air-gap permeance. The effect of the eccentricity on the current and vibration signatures is discussed. Theoretical analysis for the effect of the machine eccentricity is presented.
16 citations
03 May 2007
TL;DR: In this paper, a skewed analytical model of an axial flux permanent magnet synchronous machine (AFPMSM) was proposed for further optimization process of a 10 kW/130 rpm, 14 poles AFPMSM dedicated to wind energy application.
Abstract: This paper describes the skewed analytical model of an axial flux permanent magnet synchronous machine (AFPMSM) for further optimization process of a 10 kW/130 rpm slotted axial flux machine dedicated to wind energy application. The proposed model is based on the exact 2D solution of the magnetic field in the generator by solving the Maxwell's equations. This approach is very helpful to calculate accurately the magnetic field distribution in the machine with a reasonable computation time. The global quantities of the machine (inductances, EMF) are then calculated by using the winding functions technique. The developed model is finally used to study the influence of skewing on the main quantities (EMF, cogging torque, main torque) of a 10 kW/130 rpm, 14 poles AFPMSM dedicated for wind energy applications.
12 citations