Mediterranean Journal of Modeling and Simulation


The Mediterranean Journal of Modeling and Simulation (Med. J. Model. Simul.) is an open access journal devoted to the publication of original contributions in relevant areas. All content of the Journal is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this Journal without asking prior permission from the publisher or the author.







A new hybrid optimization algorithm CRO-DE for optimal coordination of overcurrent relays in complex power systems

Zellagui Mohamed, 

Résumé: The paper presents a new hybrid global optimization algorithm based on Chemical Reaction based Optimization (CRO) and Differential evolution (DE) algorithm for nonlinear constrained optimization problems. This ap- proach proposed for the optimal coordination and setting relays of direc- tional overcurrent relays in complex power systems. In protection coordi- nation problem, the ob jective function to be minimized is the sum of the operating time of all main relays. The optimization problem is sub ject to a number of constraints which are mainly focused on the operation of the backup relay, which should operate if a primary relay fails to respond to the fault near to it, Time Dial Setting (TDS), Plug Setting (PS) and the minimum operating time of a relay. The hybrid global proposed optimiza- tion algorithm aims to minimize the total operating time of each protection relay. Two systems are used as case study to check the efficiency of the optimization algorithm which are IEEE 4-bus and IEEE 6-bus models. Results are obtained and presented for CRO and DE and hybrid CRO-DE algorithms. The obtained results for the studied cases are compared with those results obtained when using other optimization algorithms which are Teaching Learning-Based Optimization (TLBO), Chaotic Differential Evolution Algorithm (CDEA) and Modified Differential Evolution Algo- rithm (MDEA), and Hybrid optimization algorithms (PSO-DE, IA-PSO, and BFOA-PSO). From analysing the obtained results, it has been conclu- ded that hybrid CRO-DO algorithm provides the most optimum solution with the best convergence rate.

Mots clés: Complex power systems ; Directional overcurrent relays ; Optimal Coordination ; Chemical reaction based optimiza- tion ; Differential evolution algorithm ; Hybrid global optimization algo- rithm

High performance fuzzy sliding mode control of DFIG supplied by seven level NPC inverter

Benkahla Mohamed, 

Résumé: This article presents the powers control of a variable speed wind tur- bine (WT) based on a doubly fed induction generator (DFIG) because of their advantages in terms of economy and control. The considered sys- tem consists of a double fed induction generator whose stator is connected directly to the network and its rotor is supplied by seven-level inverter with structure NPC are well used to minimize the harmonics absorbed by the DFIG. In order to control the power flowing between the stator of the DFIG and the grid. Have been studied and compared two types of controllers : Sliding Mode Control (SMC) and Fuzzy SMC (FSMC). Their respective performances are compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.

Mots clés: Doubly fed-induction generator (DFIG) ; Sliding mode control (SMC) ; Fuzzy sliding mode control (FSMC) ; Seven level NPC inverter

Thermo-mechanical analysis of the pressure plate of clutch

Mallikarjuna Venkata, 

Résumé: High Temperature appears in the contact surfaces of a clutch system (fric- tion surface and pressure plate) due to the relative motion between these parts during the sliding period. These high temperatures are responsible for several failures such as pressure plate crack, pressure plate warpage etc. With the help of Finite element analysis, the sliding friction process of the pressure plate and friction during clutch engagement is simulated to get temperature field characteristics and contact pressure of pressure plate.

Mots clés: Clutch plate ; Friction disc ; Heat generation ; Pressure plate Thermo-Mechanical coupling

Simulation, hardware implementation and control of a multilevel inverter with simulated annealing algorithm

Chabni Fayçal, 

Résumé: Harmonic pollution is a very common issue in the field of power electronics, Harmonics can cause multiple problems for power converters and electrical loads alike, this paper introduces a modulation method called selective harmonic elimination pulse width modulation (SHEPWM), this method allows the elimination of a specific order of harmonics and also control the amplitude of the fundamental component of the output voltage. In this work SHEPWM strategy is applied to a five level cascade inverter. The ob jective of this study is to demonstrate the total control provided by the SHEPWM strategy over any rank of harmonics using the simulated annealing optimization algorithm and also control the amplitude of the fundamental component at any desired value. Simulation and experimental results are presented in this work.

Mots clés: inverter ; Harmonic elimination ; Simulated annealing ; Optimization

HF Parameters of Induction Motor

Benallal M. N., 

Résumé: This article describes the results of experimental studies of HF input and primary parameters. A simulation model in Matlab SimulinkT M of multi- phase windings as ladder circuit of coils is developed. A method for deter- mining the primary parameters of ladder equivalent circuits is presented.

Mots clés: Induction motor ; HF primary and input parameters ; Ladder circuit ; PWM inverter ; Overvoltage

On three phase lags thermodiffusion theory in micropolar porous circular plate

Kumar Rajneesh, 

Résumé: The present work examines a two dimensional axisymmetric problem of micropolar porous thermodiffusion circular plate due to thermal and che- mical potential sources. The governing equations are solved by using the potential function. The expressions of displacements, microrotation, vo- lume fraction field, temperature distribution, concentration and stresses are obtained in the transformed domain by using Laplace and Hankel transforms. The inversion of transforms using Fourier expansion techniques has been applied to obtain the results in the physical domain. The nume- rical results for resulting quantities are obtained and depicted graphically to show the influence of porosity, relaxation time, phase lags, with and wi- thout energy dissipation on the resulting quantities. Some particular cases are also deduced.

Mots clés: Micropolar porous ; Thermodiffusion ; Thermal and chemical potential sources ; Laplace and Hankel transforms ; Three phase lag model