Helmi Aloui

Reluctant network‐based investigation of a claw pole alternator with DC excitation in the stator

Purpose – The purpose of this paper is to propose improvement of the generation capability of a claw pole alternator with DC excitation in the stator (CPAES) using analytical investigation based on a dedicated reluctant model.Design/methodology/approach – The paper analyzes the effects of geometry and material transformations of the magnetic circuit on the generation capability of the CPAES as well as the reduction of claw‐claw leakage flux by inserting permanent magnets in between adjacent claws.Findings – The generation capability could be improved considering the proposed geometry and material changes of the magnetic circuit of the CPAES. The inclusion of permanent magnets in between adjacent claws offers an increase of the alternator generation due to the reduction of the claw‐claw leakage flux.Research limitations/implications – The research should be extended by building a new prototype of the CPAES in order to compare analytical results and experimental ones.Practical implications – A new concept w...

1D thermal modelling of PMSM intended for an electric vehicle's powertrain

This paper deals with the development of an RC thermal model of a radial permanent magnets synchronous motor dedicated to the traction of an electric vehicle. Temperatures in different levels of the machine are so determined and obtained results are validated through a comparison with respect to ones obtained by finite elements calculation. It has been found that established model gives satisfying values at steady state and has to be reviewed in transient regime.

Hybrid incremental conductance MPPT with a fuzzy duty cycle's tuning

The energy produced by each photovoltaic cell depends on many attraction factors, called influence quantities. They include orientation and inclination of the solar panel, the temperature, the global irradiation, etc…. Solar irradiation that hits the photovoltaic modules has a variable character depending on the latitude and the orientation of the solar field corresponding to considered hour and season. As per this, it is necessary to identify instant by instant that particular point at which the PV module generates the maximum amount of power transferred to the load. The aim of this paper is to evaluate a hybrid methodology focusing Maximum Power Point Tracking (MPPT) and based on an incremental conductance program where the duty cycle is tuned using a fuzzy logic estimator. It has been demonstrated that the proposed technique has the capacity to ensure a maximum power transfer between the PV generator and the load, under fast-changing solar irradiation level. These results are confirmed by a complete Matlab/Simulink model where a Sun power SPR-305-WHT is connected to the load through a controlled Cuk DC-DC converter.

An integrated Matlab-Simulink platform for a wind energy conversion system based on a hybrid excitation synchronous generator

The purpose of this paper is to validate a control scheme of a wind turbine in its full operating range. In order to fully validate a chosen approach, it is usually necessary to perform experimental tests on a system. Fortunately, today, simulation can be a very efficient way to evaluate engineering solutions. Indeed, it is possible to perform very advanced simulations using a model sufficiently detailed to go entirely through the effects of interactions between many factors affecting the operation of the wind turbine. Failure to perform proper interconnection studies can lead to false conclusions regarding the controllers design and could endanger operations on the real system. Numerical simulation tools developed specifically for power systems and dynamic modeling may be used but general purpose modeling software such as Matlab-Simulink is well suited to the task. This paper presents an integrated Matlab-Simulink simulation platform for a robust control of a wind energy conversion system based on a hybrid excitation synchronous generator (HESG).

SWOT analysis: Tunisian energy system

The development of Renewable Energy (RE) sources and Energy Efficiency (EE) technologies is a central aim of the world energy policy. Several international programs and investments were developed in order to reduce Greenhouse Gas (GHG). Abatement of GHG emissions can mainly be achieved through utilizing the abundant RE sources and the implementation of EE measures. This paper presents the current status of the Tunisian energy system and the existing policies. An analysis of its strengths weaknesses, opportunities and threats are also discussed which can be considered as an indicator to the decision makers to exploit for investment encouragement.

Hybridization of a linear actuator intended for robotics application

The present work deals with a based 2D finite elements investigation of force generation capabilities of a tubular linear actuator considering robotics applications specificities. Following obtained results, a control strategy is established with the aim of a linear displacement under a constant and maximal force, using a non polarized configuration. Besides, a study on hybrid linear actuators has been presented to show the impact of permanent magnets integration on generated force.

2D magnetic equivalent circuit model of an electronic valve actuator

This paper deals with modeling, based on magnetic equivalent circuit (MEC), of a linear actuator intended for the control of electromagnetic valves. Adopted technique uses a permeance network obtained through meshing considered topology with 2D elementary blocks. Such technique permits to take into account the saturation behavior of ferromagnetic materials composing actuator elements. Force applied on valves is calculated then compared to corresponding finite elements (FE) computation. It has been found, that developed model provides values very close to FE ones but with much less time.