The magnetohydrodynamics (MHD) is an important interdisciplinary field. It is the interaction between an electromagnetic field and an electrically conducting fluid. Electromagnetic pumps are widely used for the transportation of the fluids in a variety of technological processes. The advantage of these devices is that permits the pumping of liquids without moving parts. The design of the pump is considered as an optimization problem where the objective function is the minimum of the MHD pump mass with both geometrical and electromagnetic contraints type. The obtained optimization results using the finite volume method with Matlab software show the performances of the used stochastic simulated annealing method.

This paper designs an indirect power control method for brushless doubly fed induction generator (BDFIG), in which the stator is attached to grid with back-to-back space vector modulation (SVM) converter that converts the generated wind power. Our control method is a sliding mode control based on the theory of variable structure control. Specifically, the active and reactive powers, which are exchanged between the stator of the BDFIG and the grid in a linear and decoupled manner, are subjected to decoupled, vector control. In addition, a proportional integral (PI) controller was implemented to keep the DC-voltage constant for the back-to-back SVM converter. The efficiency of our control strategy was validated through simulation. The research greatly promotes the control of renewable energy generators.

This paper deals with the robust power control of a grid-connected brushless doubly-fed induction generator (BDFIG) driven by the variable speed wind turbine. With the using of a super twisting algorithm which is a high-order sliding mode controller (HOSMC). This approach guarantees both the dynamic performance and the same robustness as traditional first order (SMC) algorithm and reduces the chattering phenomenon, which is the biggest disadvantage in the implementation of this technique. The developed algorithm relies on the decoupling control by implementing the strategy of oriented grid flux vector control. In order to enhance the desired performances, an attempt is made by controlling the generated stator active and reactive powers in a linear and decoupled manner to ensure the global asymptotical stability, HOSMC approach is implemented. Therefore, an optimal operation of the BDFIG in sub-synchronous operation is used in addition to the stator power flows where the stator power factor is kept in a unity. The suggested method is examined with the Matlab/Simulink software. The performances and the feasibility of the designed control are illustrated by simulation results.

Living tissues are highly heterogeneous, with very specific properties; and in order to determine the interactions between electromagnetic fields generated by different sources to which we are exposed, it is imperative to be able to calculate the induced electromagnetic currents and to find out the resulting reactions. To apprehend the field nuisance on people’s health, this paper highlights some of these effects from a simulation study of biological tissues (muscle sample) subjected to the electromagnetic field created by a 440 kV HV line. Induced currents in these tissues and their effects on blood microcirculation will be emphasized

L’Algérie possède un gisement solaire très important dû à sa grande superficie dont la majorité est aride ou semi-aride, contenant un nombre important de fermes agricoles qui peuvent être divisées en deux types : le premier est connecté au réseau conventionnel tandis que le second est situé dans des zones isolées. Ces deux types de fermes souffrent de nombreux problèmes dus au manque d'électrification ou de son insuffisance durant les périodes estivales. Dans cette étude, nous nous intéressons aux fermes des sites isolés; elles utilisent pour l’alimentation électrique des moteurs diesel qui sont limités principalement à l'irrigation et à l'éclairage des maisons pendant quelques heures par jour en raison des coûts élevés du carburant et de l'entretien des moteurs. Comme l'Algérie est l'un des pays qui a des journées ensoleillées durant toute l'année, l'énergie solaire peut contribuer à résoudre ce type de problèmes en alimentant les fermes en électricité et en leur apportant certains avantages. Dans cette étude, nous faisons l’étude d’une ferme typique dans un site isolé, tout en montrant comment l’énergie solaire peut contribuer à son alimentation en énergie électrique amicale à l’environnement.

Induction generator with direct field oriented control is preferred for high performance applications due to its excellent dynamic behavior. The accuracy for the dual star induction generator control in the remote area highly depends on estimating the undetectable machine parameter values, such as the magnetizing inductance and flux. The aim of this paper is to propose a novel direct rotor flux oriented control with online estimation of magnetizing current, which applied to stand alone dual star induction generator supplying a wind turbine in remote area. The induction generator is connected to nonlinear load through two PWM rectifiers. The results of the proposed technique based on the magnetizing inductance estimation that used to control of induction generator shows an importance to determine the rotor flux position.

The pumping of liquid metals by magnetohydrodynamic (MHD) converters, without any moving parts are competing with conventional hydraulic pumps. Thus, the movement of the fluid is a consequence of the interaction the magnetic and electric fields. This work relates to the application of an approach for optimal design of a DC magneto-hydrodynamic pump. The optimization method is based on the solution of non-linear constrained problem by combination global and local optimization method. This paper applies the hybrid algorithm by combination of genetic algorithm and Fmincon for optimal design of DC MHD pump. The comparative study of the obtained results shows that the performance of the hybrid method is effectively improved.