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45 results on '"Shahbazi, Mahmoud"'

2. Activist Poetry and Free Structure of Odes in Contemporary Iraqi Poetry: A Case Study of the Poetry Collections of Sennan Anton.

Author

Albosabl, Doaa najm Abdul Yemma, Bozchallouei, Ibrahim Anari, Shahbazi, Mahmoud, and Omidali, Ahmad

Abstract

Sennan Anton diverges from the traditional poetic meters adhered to by classical poets in his activist poetry, distancing himself from the conventional seas of poetry. In this structure, he articulates his poetic experience by exploring the visual aspects of poetry and utilizes poetic inspirations and symbolism to achieve a new poetic perspective. This approach allows him to express the dimensions of his contemporary life experiences. This research employs a descriptive-analytical method to elucidate the concept of activist poetry and its various cultural frameworks. Additionally, it exposes the structure of activist poetry odes in contemporary Iraqi poetry, specifically focusing on the technical aspects within three poetry collections of Sennan Anton: "A Rainbow Splattered with Wars," "One Night in All Cities," and "As in Heaven." The findings highlight the high frequency of rhythm in Sennan Anton's verses. The poet liberates himself from the constraints of meter, reflecting the involuntary aspect of his mind in expanding his thoughts through various geometric forms in his poetry, transforming it into a sort of verbal tableau. Numerous examples of rhymed, consecutive, and compound verses are evident in Anton's poetry. The diversity of poetic meters is apparent in Anton's work, as he departs from conventional poetic meters and prosodic constraints, characteristics of classical poetry. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Contribution à l'étude des convertisseurs statiques AC-DC-AC tolérants aux défauts

Author

Shahbazi, Mahmoud, Groupe de Recherche en Electrotechnique et Electronique de Nancy (GREEN), Université de Lorraine (UL), Laboratoire d'Instrumentation Electronique de Nancy (LIEN), Université Henri Poincaré - Nancy 1 (UHP), Université de Lorraine, Shahrokh Saadate, and Philippe Poure

Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other, AC/DC/AC converters, Convertisseur AC/DC/AC, Continuity of service, Filtres électriques actifs, Plan d'expérience, Continuité de service, Convertisseurs électriques, MADA, Énergie éolienne, Wind energy conversion system, "Fault tolerant", DFIG, Fault tolerant, FPGA, Tolérance aux fautes (ingénierie), Éolienne
Abstract

AC/DC/AC converters are widely being used in a variety of power applications. Continuity of service of these systems as well as their reliability and performances are now of the major concerns. Indeed, the failure of the converter can lead to the total or partial loss of the control of the phase currents and can cause serious system malfunction or shutdown. Thus, uncompensated faults can quickly endanger the system. Therefore, to prevent the spread of the fault to the other system components and to ensure continuity of service, fault tolerant converter topologies associated to quick and effective fault detection and compensation methods must be implemented. In this thesis, we present the continuity of service of three AC/DC/AC fault tolerant converters with or without redundancy, in the presence of a fault in one of their switches. Two types of applications are studied: the supply off a three-phase charge and a wind energy conversion system based on a DFIG. An FPGA based implementation is used for fault detection, in order to reduce the detection time as much as possible. Three optimizations in the fault detection method are also presented. During these researches, the three proposed converter topologies and their controllers are validated in simulations and also experimentally, while being validated in a "FPGA in the Loop" prototyping; Les convertisseurs statiques triphasés AC/DC/AC à structure tension sont largement utilisés dans de nombreuses applications de puissance. La continuité de service de ces systèmes ainsi que leur sécurité, leur fiabilité et leurs performances sont aujourd'hui des préoccupations majeures de ce domaine lié à l'énergie. En effet, la défaillance du convertisseur peut conduire à la perte totale ou partielle du contrôle des courants de phase et peut donc provoquer de graves dysfonctionnements du système, voire son arrêt complet. Afin d'empêcher la propagation du défaut aux autres composants du système et assurer la continuité de service en toute circonstance lors d'une défaillance du convertisseur, des topologies de convertisseur "fault tolerant" associées à des méthodes efficaces et rapides de détection et de compensation de défaut doivent être mises en oeuvre. Dans ce mémoire, nous étudions la continuité de service de trois topologies de convertisseurs AC/DC/AC avec ou sans redondance, lors de la défaillance d'un de leurs interrupteurs. Deux applications sont ciblées : l'alimentation d'une charge RL triphasée et un système éolien de conversion de l'énergie basé sur une MADA. Un composant FPGA est utilisé pour la détection du défaut, afin de réduire autant que possible son temps de détection. Des variantes permettant d'optimiser la méthode de détection de défaut sont également proposées et évaluées. Les trois topologies de convertisseurs proposées, associées à leurs contrôleurs, ont été validées de la modélisation/ simulation à la validation sur banc de test expérimental, en passant par le prototypage "FPGA in the Loop" du FPGA, destiné plus spécifiquement à la détection du défaut

Published
2012

28. Contribution to the study of fault tolerant AC-DC-AC converters

Author

Shahbazi, Mahmoud, UL, Thèses, Groupe de Recherche en Electrotechnique et Electronique de Nancy (GREEN), Université de Lorraine (UL), Laboratoire d'Instrumentation Electronique de Nancy (LIEN), Université Henri Poincaré - Nancy 1 (UHP), Université de Lorraine, Shahrokh Saadate, and Philippe Poure

Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other, AC/DC/AC converters, Convertisseur AC/DC/AC, [SPI.OTHER] Engineering Sciences [physics]/Other, Continuity of service, Filtres électriques actifs, Plan d'expérience, Continuité de service, Convertisseurs électriques, MADA, Énergie éolienne, Wind energy conversion system, "Fault tolerant", DFIG, Fault tolerant, FPGA, Tolérance aux fautes (ingénierie), Éolienne
Abstract

AC/DC/AC converters are widely being used in a variety of power applications. Continuity of service of these systems as well as their reliability and performances are now of the major concerns. Indeed, the failure of the converter can lead to the total or partial loss of the control of the phase currents and can cause serious system malfunction or shutdown. Thus, uncompensated faults can quickly endanger the system. Therefore, to prevent the spread of the fault to the other system components and to ensure continuity of service, fault tolerant converter topologies associated to quick and effective fault detection and compensation methods must be implemented. In this thesis, we present the continuity of service of three AC/DC/AC fault tolerant converters with or without redundancy, in the presence of a fault in one of their switches. Two types of applications are studied: the supply off a three-phase charge and a wind energy conversion system based on a DFIG. An FPGA based implementation is used for fault detection, in order to reduce the detection time as much as possible. Three optimizations in the fault detection method are also presented. During these researches, the three proposed converter topologies and their controllers are validated in simulations and also experimentally, while being validated in a "FPGA in the Loop" prototyping, Les convertisseurs statiques triphasés AC/DC/AC à structure tension sont largement utilisés dans de nombreuses applications de puissance. La continuité de service de ces systèmes ainsi que leur sécurité, leur fiabilité et leurs performances sont aujourd'hui des préoccupations majeures de ce domaine lié à l'énergie. En effet, la défaillance du convertisseur peut conduire à la perte totale ou partielle du contrôle des courants de phase et peut donc provoquer de graves dysfonctionnements du système, voire son arrêt complet. Afin d'empêcher la propagation du défaut aux autres composants du système et assurer la continuité de service en toute circonstance lors d'une défaillance du convertisseur, des topologies de convertisseur "fault tolerant" associées à des méthodes efficaces et rapides de détection et de compensation de défaut doivent être mises en oeuvre. Dans ce mémoire, nous étudions la continuité de service de trois topologies de convertisseurs AC/DC/AC avec ou sans redondance, lors de la défaillance d'un de leurs interrupteurs. Deux applications sont ciblées : l'alimentation d'une charge RL triphasée et un système éolien de conversion de l'énergie basé sur une MADA. Un composant FPGA est utilisé pour la détection du défaut, afin de réduire autant que possible son temps de détection. Des variantes permettant d'optimiser la méthode de détection de défaut sont également proposées et évaluées. Les trois topologies de convertisseurs proposées, associées à leurs contrôleurs, ont été validées de la modélisation/ simulation à la validation sur banc de test expérimental, en passant par le prototypage "FPGA in the Loop" du FPGA, destiné plus spécifiquement à la détection du défaut

Published
2012

41. Wind energy conversion system based on DFIG with open switch fault tolerant six-legs AC-DC-AC converter.

Author

Shahbazi, Mahmoud, Zolghadri, Mohammad Reza, Poure, Philippe, and Saadate, Shahrokh

Abstract

Continuity of service of wind energy conversion systems as well as their reliability and performances are some of the major concerns in this power generation area. Six-legs AC/DC/AC converters are normally used in modern wind energy systems like as in the system with a doubly-fed induction generator (DFIG). A sudden failure of the converter can lead to the total or partial loss of the control of the phase currents and can cause serious system malfunction or shutdown. Therefore, to prevent the spread of the fault to the other system components and to ensure continuity of service, fault tolerant converter topologies associated to quick and effective fault detection and compensation methods must be implemented. In this paper, a fault tolerant AC/DC/AC converter for a wind energy conversion system based on a DFIG is studied. The presented six-legs converter uses an additional leg that replaces the faulty one after the fault detection. An FPGA is used for experimental implementation of the fault detection scheme, to assure the fast fault detection. A rapid prototyping based on an intermediate “FPGA in the loop” step is used for digital implementation. “FPGA in the loop” results as well as fully experimental results are provided to demonstrate the effectiveness of the proposed fault detection and fault tolerant control. [ABSTRACT FROM PUBLISHER]

Published
2013
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42. Open- and Short-Circuit Switch Fault Diagnosis for Nonisolated DC–DC Converters Using Field Programmable Gate Array.

Author

Shahbazi, Mahmoud, Jamshidpour, Ehsan, Poure, Philippe, Saadate, Shahrokh, and Zolghadri, Mohammad Reza

Subjects
*CONVERTERS (Electronics), *PROTOCOL converters, *SWITCHING power supplies, *DIGITAL control systems, *POWER semiconductors
Abstract

Fault detection (FD) in power electronic converters is necessary in embedded and safety critical applications to prevent further damage. Fast FD is a mandatory step in order to make a suitable response to a fault in one of the semiconductor devices. The aim of this study is to present a fast yet robust method for fault diagnosis in nonisolated dc–dc converters. FD is based on time and current criteria which observe the slope of the inductor current over the time. It is realized by using a hybrid structure via coordinated operation of two FD subsystems that work in parallel. No additional sensors, which increase system cost and reduce reliability, are required for this detection method. For validation, computer simulations are first carried out. The proposed detection scheme is validated on a boost converter. Effects of input disturbances and the closed-loop control are also considered. In the experimental setup, a field programmable gate array digital target is used for the implementation of the proposed method, to perform a very fast switch FD. Results show that, with the presented method, FD is robust and can be done in a few microseconds. [ABSTRACT FROM PUBLISHER]

Published
2013
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43. FPGA-Based Reconfigurable Control for Fault-Tolerant Back-to-Back Converter Without Redundancy.

Author

Shahbazi, Mahmoud, Poure, Philippe, Saadate, Shahrokh, and Zolghadri, Mohammad Reza

Subjects
*FIELD programmable gate arrays, *FAULT tolerance (Engineering), *CONVERTERS (Electronics), *SEMICONDUCTOR switches, *CAPACITOR switching, *MATHEMATICAL models
Abstract

In this paper, an FPGA-based fault-tolerant back-to-back converter without redundancy is studied. Before fault occurrence, the fault-tolerant converter operates like a conventional back-to-back six-leg converter, and after the fault, it becomes a five-leg converter. Design, implementation, and experimental verification of an FPGA-based reconfigurable control strategy for this converter are discussed. This reconfigurable control strategy allows the continuous operation of the converter with minimum affection from a fault in one of the semiconductor switches. A very fast detection scheme is used to detect and locate the fault. Implementation of the fault detection and of the fully digital control schemes on a single FPGA is realized, based on a suited methodology for rapid prototyping. FPGA in loop and also experimental tests are carried out, and the results are presented. These results confirm the capability of the proposed reconfigurable control and fault-tolerant structure. [ABSTRACT FROM PUBLISHER]

Published
2013
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44. Fault-Tolerant Five-Leg Converter Topology With FPGA-Based Reconfigurable Control.

Author

Shahbazi, Mahmoud, Poure, Philippe, Saadate, Shahrokh, and Zolghadri, Mohammad Reza

Subjects
*CONVERTERS (Electronics), *FIELD programmable gate arrays, *MICROPROCESSORS, *FAULT tolerance (Engineering), *SIMULATION methods & models
Abstract

Fast fault detection and reconfiguration of power converters is necessary in electrical drives to prevent further damage and to make the continuity of service possible. On the other hand, component minimized converters may provide the benefits of higher reliability and less volume and cost. In this paper, a new fault-tolerant converter topology is studied. This converter has five legs before the fault occurrence, and after fault detection the converter continues to function with four legs. A very fast fault detection and reconfiguration scheme is presented and studied. Simulations and experimental tests are performed to evaluate the structure requirements, the digital reconfigurable controller, and fault detection scheme. For experimental tests, the control and the fault detection and reconfiguration schemes are implemented on a single field-programmable gate array (FPGA) chip. Experimental and simulation results show the effectiveness of the proposed fault-tolerant topology and its FPGA-based control. [ABSTRACT FROM PUBLISHER]

Published
2013
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45. Six-Leg AC-AC Fault Tolerant Converter with Reduced Extra-Sensor Number.

Author

Shahbazi, Mahmoud, Poure, Philippe, Zolghadri, Mohammad Reza, and Saadate, Shahrokh

Subjects
FAULT tolerance (Engineering), CONVERTERS (Electronics), ELECTRIC fault location, ELECTRIC potential, FIELD programmable gate arrays, TOPOLOGY, DETECTORS, REDUNDANCY in engineering
Abstract

In order to prevent further damage and to provide the continuity of service of six-leg converter in case of open-switch fault, it is mandatory to perform fast fault detection and converter reconfiguration schemes. Extra sensors are needed to detect the faults rapidly. In this paper, a very fast FPGA-based fault detection scheme is presented that minimizes the number of additional voltage sensors. A six-leg fault tolerant converter topology without redundancy and with bidirectional power flow is studied. First simulations are carried out to evaluate the proposed fault detection principle and the fault tolerant converter topology. The fully digital control and the fault detection are implemented on a single FPGA. Experimental tests of the digital controller and the detection scheme are performed to verify the high performance of the proposed method. [ABSTRACT FROM AUTHOR]

Published
2011

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