Nombre total de résultats : 98
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Finite-Set Model Predictive Decoupled Active and Reactive Power Control for Wind Energy Systems

Badreddine BABES, Amar Bouafassa, Amar BOUTAGHANE  (2017)
Article de conférence

This paper introduces a novel approach for direct power control of three-phase voltage source inverter in grid connected distribution wind energy systems. In this approach, the control of active and reactive power is based on finite-set model predictive control strategy. The proposed strategy has the simplicity of the direct power control technique and doesn’t require any current control loops. To meet the future generation of Permanent magnet synchronous generator wind turbines, a DC-DC boost converter is proposed at the machine-side to simplify the control and potentially reduce the cost of the wind energy system. The wind generation system requirements, such as maximum energy harvesting and regulation of grid active and reactive power are expressed as cost functions. Best switching states are selected and applied to the power converters during each sampling interval based on the minimization of cost functions. The feasibility of the proposed configuration and control scheme are verified through dSPACE 1104 experiments on a low power prototype. Voir les détails

Mots clés : Maximum Power Point Tracking, Finite-set model predictive control, Permanent Magnet Synchronous generator, Wind energy system

Analysis and experimental evaluation of shunt active power filter for power quality improvement based on predictive direct power control

Oualid Aissa, Samir Moulahoum, Ilhami Colak, Badreddine BABES, Nadir Kabache  (2017)

This paper discusses the use of the concept of classical and predictive direct power control for shunt active power filter function. These strategies are used to improve the active power filter performance by compensation of the reactive power and the elimination of the harmonic currents drawn by non-linear loads. A theoretical analysis followed by a simulation using MATLAB/Simulink software for the studied techniques has been established. Moreover, two test benches have been carried out using the dSPACE card 1104 for the classic and predictive DPC control to evaluate the studied methods in real time. Obtained results are presented and compared in this paper to confirm the superiority of the predictive technique. To overcome the pollution problems caused by the consumption of fossil fuels, renewable energies are the alternatives recommended to ensure green energy. In the same context, the tested predictive filter can easily be supplied by a renewable energy source that will give its impact to enhance the power quality. Voir les détails

Mots clés : Harmonic pollution, Power quality, Direct power control, Predictive direct power control, Shunt active filter, Renewable energy source, power factor

Type-2 Fuzzy Logic Predictive Control of a Grid Connected Wind Power Systems with Integrated Active Power Filter Capabilities

Noureddine Hamouda, Hocine Benalla, Kameleddine Hemsas, Badreddine BABES, Jürgen Petzoldt, Thomas Ellinger, Cherif Hamouda  (2017)

This paper proposes a real-time implementation of an optimal operation of a double stage grid connected wind power system incorporating an active power filter (APF). The system is used to supply the nonlinear loads with harmonics and reactive power compensation. On the generator side, a new adaptive neuro fuzzy inference system (ANFIS) based maximum power point tracking (MPPT) control is proposed to track the maximum wind power point regardless of wind speed fluctuations. Whereas on the grid side, a modified predictive current control (PCC) algorithm is used to control the APF, and allow to ensure both compensating harmonic currents and injecting the generated power into the grid. Also a type 2 fuzzy logic controller is used to control the DC-link capacitor in order to improve the dynamic response of the APF, and to ensure a well-smoothed DC-Link capacitor voltage. The gained benefits from these proposed control algorithms are the main contribution in this work. The proposed control scheme is implemented on a small-scale wind energy conversion system (WECS) controlled by a dSPACE 1104 card. Experimental results show that the proposed T2FLC maintains the DC-Link capacitor voltage within the limit for injecting the power into the grid. In addition, the PCC of the APF guarantees a flexible settlement of real power exchanges from the WECS to the grid with a high power factor operation. Voir les détails

Mots clés : Active power filter (APF), Adaptive neuro fuzzy inference system (ANFIS), Maximum Power Point Tracking (MPPT), Predictive current control (PCC), Type-2 fuzzy logic controller (T2FLC)

Waveguide Filter Modeling and Simulation using Mode-matching, FullwaveNetwork Analysis and Swarm Optimization

I. BOUCHACHI, J. Mateu, M. L. Riabi  (2017)

This paper presents the modeling ofwaveguide bandpass filter synthesis. It consists of acombination of the most appropriate and reliablemethods and techniques of analysis, simulation andoptimization used in determined order and leading to afast and accurate method of filter synthesis. An exampleof a forth-order filter synthesis is given, employing asymmetric configuration and symmetric response. Theobtained results, reference measurement and commercialsoftware simulator results are compared for validation. Voir les détails

Mots clés : filter, waveguide, Coupling matrix, Mode-matching, Segmentation method, Optimization techniques.

Contribution à la modélisation de structures et dispositifs passifs microondes basée sur l’utilisation de différentes techniques d’optimisation : Application aux filtres en guides d’ondes rectangulaires métalliques

Islem BOUCHACHI (2017)
Thèse de doctorat

In this work, we proposed a method for the synthesis of hollow waveguides filters. It consists of a combination of several calculations, simulations and optimizations techniques classified in a defined order to result in band-pass filters. It is a question of: First, to generate the coupling matrix starting from the filter specifications. Deduce the equivalent circuit and then convert it into a microwave structure, which consists of replacing the resonators and inverters of the circuit by resonant cavities and couplers. Once the circuit has been converted to a microwave structure, we need an analysis method to ensure the right conversion. For this, we used the segmentation method, which consists in fragmenting the structure into several basic elements (junction, bend and T-junction). Each element is analyzed separately using the mode-matching method, and then the structure is assimilated to a network made up of these basic elements. Since the final result requires optimization because it does not correspond perfectly to the specifications of the structure to be synthesized, we have studied and used three optimization techniques: genetic algorithms, particle swarm optimization and neural networks. To validate our synthesis method, we have successfully applied it to the synthesis of the Tchebychev, Dual-mode, and generalized Tchebychev band-pass filters. Voir les détails

Mots clés : filter, waveguide, Coupling matrix, Mode-matching, Segmentation method, Optimization techniques.

Contribution à l’Etude du Choix Optimal de l’Emplacement du Dispositif UPFC dans les Réseaux Electriques en Utilisant une des Méthodes Artificielles

Mohamed MEZAACHE (2016)
Thèse de doctorat

With the increasing electric power demand, the operation of power system becomes more complex to operate within the indices power quality, and therefore will become less secure. The advent of Flexible Alternating Current Transmission Systems (FACTS) technology has coincided with the major restructuring of the electrical power industry; it can provide significant benefits in increasing system transmission capacity and power flow control flexibility and rapidity. Several types of FACTS exist and choosing the appropriate device depends on the objectives to reach. Unified Power Flow Controller (UPFC) is one of the most effective FACTS devices for enhancing power system security; however, to what extent the performance of UPFC can be brought out, it highly depends upon the location and parameter setting of this device in the system. A lot of research has been done on determining the optimal locations of FACTS devices in power systems. There are several methods permitting to find the optimal locations of FACTS devices according to specified criteria and constraints. Among these methods are found the Genetic Algorithm (GA) method. The latter is a global search and optimization technique which is based on the mechanisms of natural selection and genetics; it can search several possible solutions simultaneously and do not require any prior knowledge of the objective function. In this thesis, genetic algorithms technique is used to solve the problem of choosing the location and rating of FACTS to install. Five types of FACTS devices have been used in this study namely: SVC, TCSC, TCVR, TCPST and UPFC. These FACTS devices are used to maximize the system loadability in the network. Their position and size are determined using coefficients calculated when the load increases. To validate the efficacy of the technique used, has been applied on many IEEE standard electrical network test (14, 30 and 57 bus) using the MATLAB program. Voir les détails

Mots clés : Indices power quality, FACTS, UPFC, GA, global optimization, objective function, SVC, TCSC, TCVR, TCPST, loadability, MATLAB program

Etude de la Performance d’un Dispositif STATCOM Utilisée pour Compenser la Puissance Réactive au Point de Raccordement

M. MEZAACHE  (2013)
Article de conférence

The industrial extension during the last decades led to increasing considerable requirements in the electric power, in spite of the significant energy production.The FACTS concept “Flexible Alternative Current Transmission Systems” regroups all devices to basis of electronics of power that permits to improve the exploitation of the electric network. The technology of these systems “static switches” assure a speed superior to the one of the classic electromechanical systems.The objective of this paper is to study the functions of control offered by the STATCOM “STATic COMpensator” in the regulation of the voltage by compensation of the reactive energy. Voir les détails

Mots clés : FACTS, static switches, STATCOM

Contrôle des Transits de Puissance par l’Utilisation d’un UPFC Connecté à une Ligne de Transmission

M. MEZAACHE  (2013)
Article de conférence

The FACTS technologies involve conversion andswitching of power electronics in the range of a few tens to few hundred megawatts. The new state devices such as MOSFETs, IGBTs, GTOs and also other suitable power electronic devices are used as controlled switches in FACTS devices. The universal and most flexible FACTS device is the Unified Power Flow Controller “UPFC”, this device is the combination of three compensators characteristic; i.e., impedance, voltage magnitude and phase angle, that are able to produce a more complete compensation [1]. Voir les détails


Evaluation de Comportement du Dispositif UPFC Connecté au Réseau Electrique pour Contrôler l’Ecoulement de Puissance

M. MEZAACHE  (2012)
Article de conférence

This paper presents some structures of the FACTS (series, shunt and hybrid) based on the GTO thyristors. We make an approach on the modelling of the UPFC. First, we present the equivalent diagram of the studied network, then we expose the results of simulation gotten by the software MATLAB/SIMULINK, so their interpretations. Finally, we try to make a comparison between the results, with another proposition of site of the UPFC on the same network. Voir les détails

Mots clés : FACTS, GTO, modelling, UPFC