WEBREVIEW

Characterisation of an Optical Strain Gauge for Pantograph Applications .

Davies T., Khanniche M. S., Khanniche R. — 2011-03-14T10:21:51Z

An optical strain gauge is developed and characterised for an active pantograph for
high-speed electrical trains applications. Indeed, the pantograph is subjected to a
continuous impact forces when it makes contact with the 25 kV overhead ac line.
To detect load behaviour experienced, by the electrical pick-up on the pantograph,
tests were carried out. The results show that the strain gauge responded linearly to
static load over the range 0 to 80 Newton. Also, a high repeatability was (...)

- Volume 01 issue 03 / Optical strain gauge, Load behaviour, Electromagnetic field, Repeatability

Comparison between Optimal Minimization of Total Harmonic Distortion and Harmonic Elimination with Voltage Control candidates for Multilevel Inverters.

Fellah M. K., Sahali Y. — 2011-03-14T10:07:46Z

This paper is devoted to the comparative evaluation of the two modulation
strategies developed for multilevel inverters control : the harmonic elimination
technique with voltage control (OHSW) and the optimal minimization of the total
harmonic distortion method (OMTHD), which are a very important and efficient
strategies of eliminating selected harmonics from spectrum of the output voltage or
minimizing its total harmonic distortion in order to improve its quality. First, we (...)

- Volume 01 issue 03 / Thd, Multilevel inverter (vsi), Cascade inverter, Harmonic elimination, Pulse width modulation (pwm)

Coupled Analytical-Finite Element Methods for Linear Electromagnetic Actuator Analysis.

Miraoui A., Rahem D., Srairi K., Srairi S. — 2011-03-14T10:00:55Z

In this paper, a linear electromagnetic actuator with moving parts is analyzed. The
movement is considered through the modification of boundary conditions only using
coupled analytical and finite element analysis. In order to evaluate the dynamic
performance of the device, the coupling between electric, magnetic and mechanical
phenomena is established. The displacement of the moving parts and the inductor
current are determined when the device is supplied by capacitor discharge (...)

- Volume 01 issue 03 / Actuators, Analytical analysis, Coupling model, Finite element method, Movement, Transient feeding

Dynamic Performance of an HVDC Link.

Fellah M. K., Hadjeri S., Zidi S.A. — 2011-03-14T09:48:10Z

This paper presents the results of a simulation study on a 12 pulse HVDC (High
Voltage Direct Current) using a system in Matlab/Simulink. The object of the
study is to investigate the steady state and dynamic performance of the system.
First we examine response of current regulator after change in current reference in
order to see the behavior of the controllers in controlling the desired current. Next,
we present the digital simulation of a test system and show the response to a DC (...)

- Volume 01 issue 03 / Hvdc, Recovery, Fault simulation, vdcol

Artificial Neural Network for Real Time Load Flow Calculation:Application to a Micro Grid with Wind Generators .

Francois B., Hadj Abdallah H., Krichen L. — 2011-03-14T09:35:01Z

This work presents a method for solving the problem of load flow in electric power
systems including a wind power station with asynchronous generators. For this type
of power station, the generated active power is only known and consequently the
absorbed reactive power must be determined. So we have used the circular diagram
at each iteration and by considering this node as a consuming node in the load flow
program. Since the wind speed is not constant, the generated power is neither (...)

- Volume 01 issue 03 / Artificial neural networks, Electrical supply networks, Load flow, Microgrid, Circular power diagram, Wind generator

High Dynamic Torque Capability With Efficiency Optimization Control of Induction Motor Drives

Barra K., Benmahammed A. , Benmahammed K. — 2011-03-14T09:04:45Z

The objective of this paper is to present an analysis of how to get high performance of an induction motor drive for both dynamic and steady state operation. In order to improve a good dynamic response in transient ( minimize the speed drop) , an algorithm for a maximum torque capability of the available maximum inverter current and voltage is presented. When the rotor speed reaches its reference, a loss minimization algorithm is developed to improve high efficiency. Simulation studies show (...)

- volume 01 issue 02 / Induction motor , Maximum torque control, Efficiency optimization

A Learning Aid Tool for Power Electronics Converters

Bashi S.M., Bin Aris I., Bouketir O., Mariun N., Taib S. — 2007-06-25T09:03:00Z

It is known that power electronics and its related subjects are not easy to understand for students taking them for first time. This is due to nature of the subjects which involve many areas and disciplines. The introduction of generalpurpose simulation package has helped the student a step further in understanding this subject. However, because of the generality of these tools and their drag-anddrop and ad-hoc features, the students still face problems in designing a converter circuit. In (...)

- volume 01 issue 02 / Class, Converter, Database, Inference engine, Knowledge base, Oop, Switching device

Object-Oriented Economic Power Dispatch of Electrical Power System with minimum pollution sing a Genetic Algorithm

Bouktir T., Slimani L. — 2007-06-25T08:25:43Z

This paper presents solution of optimal power flow ( OPF) problem of electrical power system via a genetic algorithm of real type. The objective is to minimize the total fuel cost of generation and environmental pollution caused by fossil based thermal generating units and also maintain an acceptable system performance in terms of limits on generator real and reactive power outputs, bus voltages, shunt capacitors/reactors, transformers tap-setting and power flow of transmission lines.
CPU times can be reduced by decomposing the optimization constraints to active constraints that affect directly the cost function manipulated directly the GA, and passive constraints such as generator bus voltages and transformer tap setting maintained in their soft limits using a conventional constraint load flow. The algorithm was developed in an Object Oriented fashion, in the C++ programming language. This option satisfies the requirements of flexibility, extensibility,maintainability and data integrity. The economic power dispatch is applied to IEEE 30-bus model system ( 6-generator, 41-line and 20-load) . The numerical results have demonstrate the effectiveness of the stochastic search algorithms
because its can provide accurate dispatch solutions with reasonable time. Further analyses indicate that this method is effective for large-scale power systems.

A Neural Non-linear Predictive Control for PEM-FC

Cirrincione G., Cirrincione M., Pucci M., Simões M. — 2007-06-23T13:57:25Z

This paper deals with the application of non-linear predictive control with neural networks to Proton Exchange Membrane Fuel Cells (PEM-FC). The control objective is to regulate the cell voltage, acting on the hydrogen pressure, trying to reduce the variation of the input control variable. An analysis of the non-linearities of the fuel cell stack has been carried out, making use of a suitable fuel cell model.
The non-linear predictive control has been implemented by several neural networks (...)

- volume 01 issue 02 / Neural networks, Pem-fc, Non-linear control, Predictive control

Fuzzy Control of a Lead Acid Battery charger

Daoud A., Midoun A. — 2007-01-31T13:57:10Z

In this paper, an alternative battery charging control technique based on fuzzy logic for photovoltaic (PV) applications is presented. A PV module is connected to a buck type DC/DC power converter and a microcontroller based unit is used to control the lead acid battery charging voltage. The fuzzy control is used due to the simplicity of implementation, robustness and independence from the complex mathematical representation of the battery. The usefulness of this control method is confirmed (...)

- Numéro 01 / Fuzzy controller, Pv module, Buck converter, Microcontroller, Lead acid battery