The Experts below are selected from a list of 28950 Experts worldwide ranked by ideXlab platform
Philippe Poure - One of the best experts on this subject based on the ideXlab platform.
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Service Continuity of pv synchronous buck buck boost converter with energy storage
Energies, 2018Co-Authors: Saima Siouane, Slavisa Jovanovic, Philippe PoureAbstract:Numerous advantages offered by Photovoltaic (PV) generation systems coupled with the increasing power demands for clean energy put PV systems in the front of many research works. For stand-alone applications powered with PV systems, the reliability of the power conversion stage is essential to ensure the continuous supply of energy. Therefore, in the case of any failure occurring in the power conversion stage, it is mandatory to provide remedial actions to guarantee the Service Continuity of the produced electrical power. This paper analyses the Service Continuity of a two-stage buck/buck-boost converter with energy storage, driven with synchronous control. The initial two-stage converter is made fault-tolerant and robust to failures of its two switches by adding only one additional switch associated with two diodes. In this study, only open-circuit switch faults are considered. The proposed fault-tolerant circuit and the initial one have the same electrical behavior when synchronous control is used. The applied synchronous control in both healthy conditions and post-fault operation ensures the same functionalities without degrading the system’s performances. The proposed two-stage synchronously-controlled circuit is validated through simulation in the cases of open circuit faults on the two switches of the initial converter. The obtained results show the feasibility of the proposed functional redundancy and the Continuity of operation at full power after switch fault diagnosis.
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Service Continuity of pv synchronous buck buck boost converter with energy storage
International Conference on Environment and Electrical Engineering, 2017Co-Authors: Saima Siouane, Slavisa Jovanovic, Philippe PoureAbstract:Renewable Energy sources present an efficient and economically viable energy supply approach for stand-alone applications. Electricity produced with Photovoltaic (PV) panels is among the most important energy contributions in energy harvesting systems. Moreover, the produced electrical power should not be interrupted, especially in critical applications. In this paper, the Service Continuity of a Buck/Buck-Boost converter, used as an interface between the PV source and the load, is discussed. A new fault tolerant converter topology is proposed, which allows to guarantee Service Continuity in open circuit switch fault cases, when a synchronous control is applied. A single additional switch, associated with two diodes, allows to keep the same power exchanges capabilities after open switch fault diagnosis, without modifying the synchronous control applied in healthy conditions. The resulting fault tolerant system is validated by simulation and the obtained results confirm the effectiveness of Service Continuity under open circuit switch fault.
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single switch dc dc converter with fault tolerant capability under open and short circuit switch failures
IEEE Transactions on Power Electronics, 2015Co-Authors: Ehsan Jamshidpour, Philippe Poure, Eskandar Gholipour, S SaadateAbstract:This paper proposes fault-tolerant (FT) operation of a single-switch dc-dc converter under a switch failure. In order to improve the reliability in critical applications, FT operation is mandatory to guarantee Service Continuity. The FT operation of a power system can be performed in three steps: fault diagnosis (detection and identification) and remedial actions. In the case of a switch failure, suitable fault detection is essential to avoid its propagation to the whole system. This study is based on a fast and efficient open- and short-circuit switch fault diagnosis. Both types of switch failure can be detected, identified, and handled in real time by implementing fault diagnosis and reconfiguration strategies on a field-programmable gate array target. No additional sensor is required to perform the fault detection. A redundant switch and a bidirectional switch are needed for converter reconfiguration in postfault operation. The results of hardware-in-the-loop and experimental tests, which all confirm the good performances of the proposed approach, are presented and discussed.
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photovoltaic systems reliability improvement by real time fpga based switch failure diagnosis and fault tolerant dc dc converter
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Ehsan Jamshidpour, Philippe Poure, S SaadateAbstract:The increased penetration of photovoltaic (PV) systems in different applications with critical loads such as in medical applications, industrial control systems, and telecommunications has highlighted pressing needs to address reliability and Service Continuity. Recently, distributed maximum power point tracking architectures, based on dc–dc converters, are being used increasingly in PV systems. Nevertheless, dc–dc converters are one of the important failure sources in a PV system. Since the semiconductor switches are one of the most critical elements in these converters, a fast switch fault detection method (FDM) is a mandatory step to guarantee the Service Continuity of these systems. This paper proposes a very fast FDM based on the shape of the inductor current associated to fault-tolerant (FT) operation for boost converter used in PV systems. By implementing fault diagnosis and reconfiguration strategies on a single field-programmable gate array target, both types of switch failure (open- and short-circuit faults) can be detected, identified and handled in real time. The FDM uses the signal provided by the current sensor dedicated to the control of the system. Consequently, no additional sensor is required. The proposed FT topology is based on a redundant switch. The results of hardware-in-the-loop and experimental tests, which all confirm the excellent performances of the proposed approach, are presented and discussed. The obtained results show that a switch fault can be detected in less than one switching period, typically around 100 ms in medium power applications, by the proposed FDM.
Saima Siouane - One of the best experts on this subject based on the ideXlab platform.
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Service Continuity of pv synchronous buck buck boost converter with energy storage
Energies, 2018Co-Authors: Saima Siouane, Slavisa Jovanovic, Philippe PoureAbstract:Numerous advantages offered by Photovoltaic (PV) generation systems coupled with the increasing power demands for clean energy put PV systems in the front of many research works. For stand-alone applications powered with PV systems, the reliability of the power conversion stage is essential to ensure the continuous supply of energy. Therefore, in the case of any failure occurring in the power conversion stage, it is mandatory to provide remedial actions to guarantee the Service Continuity of the produced electrical power. This paper analyses the Service Continuity of a two-stage buck/buck-boost converter with energy storage, driven with synchronous control. The initial two-stage converter is made fault-tolerant and robust to failures of its two switches by adding only one additional switch associated with two diodes. In this study, only open-circuit switch faults are considered. The proposed fault-tolerant circuit and the initial one have the same electrical behavior when synchronous control is used. The applied synchronous control in both healthy conditions and post-fault operation ensures the same functionalities without degrading the system’s performances. The proposed two-stage synchronously-controlled circuit is validated through simulation in the cases of open circuit faults on the two switches of the initial converter. The obtained results show the feasibility of the proposed functional redundancy and the Continuity of operation at full power after switch fault diagnosis.
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Service Continuity of pv synchronous buck buck boost converter with energy storage
International Conference on Environment and Electrical Engineering, 2017Co-Authors: Saima Siouane, Slavisa Jovanovic, Philippe PoureAbstract:Renewable Energy sources present an efficient and economically viable energy supply approach for stand-alone applications. Electricity produced with Photovoltaic (PV) panels is among the most important energy contributions in energy harvesting systems. Moreover, the produced electrical power should not be interrupted, especially in critical applications. In this paper, the Service Continuity of a Buck/Buck-Boost converter, used as an interface between the PV source and the load, is discussed. A new fault tolerant converter topology is proposed, which allows to guarantee Service Continuity in open circuit switch fault cases, when a synchronous control is applied. A single additional switch, associated with two diodes, allows to keep the same power exchanges capabilities after open switch fault diagnosis, without modifying the synchronous control applied in healthy conditions. The resulting fault tolerant system is validated by simulation and the obtained results confirm the effectiveness of Service Continuity under open circuit switch fault.
Slavisa Jovanovic - One of the best experts on this subject based on the ideXlab platform.
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Service Continuity of pv synchronous buck buck boost converter with energy storage
Energies, 2018Co-Authors: Saima Siouane, Slavisa Jovanovic, Philippe PoureAbstract:Numerous advantages offered by Photovoltaic (PV) generation systems coupled with the increasing power demands for clean energy put PV systems in the front of many research works. For stand-alone applications powered with PV systems, the reliability of the power conversion stage is essential to ensure the continuous supply of energy. Therefore, in the case of any failure occurring in the power conversion stage, it is mandatory to provide remedial actions to guarantee the Service Continuity of the produced electrical power. This paper analyses the Service Continuity of a two-stage buck/buck-boost converter with energy storage, driven with synchronous control. The initial two-stage converter is made fault-tolerant and robust to failures of its two switches by adding only one additional switch associated with two diodes. In this study, only open-circuit switch faults are considered. The proposed fault-tolerant circuit and the initial one have the same electrical behavior when synchronous control is used. The applied synchronous control in both healthy conditions and post-fault operation ensures the same functionalities without degrading the system’s performances. The proposed two-stage synchronously-controlled circuit is validated through simulation in the cases of open circuit faults on the two switches of the initial converter. The obtained results show the feasibility of the proposed functional redundancy and the Continuity of operation at full power after switch fault diagnosis.
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Service Continuity of pv synchronous buck buck boost converter with energy storage
International Conference on Environment and Electrical Engineering, 2017Co-Authors: Saima Siouane, Slavisa Jovanovic, Philippe PoureAbstract:Renewable Energy sources present an efficient and economically viable energy supply approach for stand-alone applications. Electricity produced with Photovoltaic (PV) panels is among the most important energy contributions in energy harvesting systems. Moreover, the produced electrical power should not be interrupted, especially in critical applications. In this paper, the Service Continuity of a Buck/Buck-Boost converter, used as an interface between the PV source and the load, is discussed. A new fault tolerant converter topology is proposed, which allows to guarantee Service Continuity in open circuit switch fault cases, when a synchronous control is applied. A single additional switch, associated with two diodes, allows to keep the same power exchanges capabilities after open switch fault diagnosis, without modifying the synchronous control applied in healthy conditions. The resulting fault tolerant system is validated by simulation and the obtained results confirm the effectiveness of Service Continuity under open circuit switch fault.
Mohsen Guizani - One of the best experts on this subject based on the ideXlab platform.
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Process state synchronization for mobility support in mobile cloud computing
2017 IEEE International Conference on Communications (ICC), 2017Co-Authors: Ejaz Ahmed, Anjum Naveed, Siti Hafizah Ab Hamid, Abdullah Gani, Muhammad Imran, Mohsen GuizaniAbstract:Mobile Cloud Computing (MCC) extends cloud Services to the resource-constrained mobile devices. Compute-intensive mobile applications can be augmented using cloud either in client/server model or through cyber foraging. However, long or permanent network disconnections due to user mobility increase the execution time and in certain cases refrain the mobile devices from getting response back for the remotely performed execution. In this paper, we propose use of process state synchronization (PSS) as a mechanism to mitigate the impact of network disconnections on the Service Continuity of cloud-based interactive mobile applications. To validate the PSS-based execution, we develop a mathematical model that incorporates the disconnection and synchronization intervals, and mobile device capabilities along with that of cloud. The comparison with existing mechanisms shows that PSS reduces the execution time by upto 47% for intermittent network connectivity compared to COMET and by upto 35% for optimized VM-based offloading.
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proactive multipath tcp for seamless handoff in heterogeneous wireless access networks
IEEE Transactions on Wireless Communications, 2016Co-Authors: Hassan Sinky, Bechir Hamdaoui, Mohsen GuizaniAbstract:Multipath TCP (MPTCP) is a new evolution of TCP that enables a single MPTCP connection to use multiple TCP subflows transparently to applications. Each subflow runs independently allowing the connection to be maintained if endpoints change; essential in a dynamic network. Differentiating between congestion delay and delay due to handoffs is an important distinction overlooked by transport layer protocols. Protocol modifications are needed to alleviate handoff induced issues in a growing mobile culture. In this paper, findings are presented on transport layer handoff issues in currently deployed networks. MPTCP as a potential solution to addressing handoff- and mobility-related Service Continuity issues is discussed. Finally, a handoff-aware cross-layer-assisted MPTCP (CLA-MPTCP) congestion control algorithm is designed and evaluated.
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handoff aware cross layer assisted multi path tcp for proactive congestion control in mobile heterogeneous wireless networks
Global Communications Conference, 2014Co-Authors: Hassan Sinky, Bechir Hamdaoui, Mohsen GuizaniAbstract:Multi-Path TCP (MPTCP) is a new evolution of TCP that enables a single MPTCP connection to use multiple TCP subflows transparently to applications. Each subflow runs independently allowing the connection to be maintained if endpoints change; essential in a dynamic network. Differentiating between congestion delay and delay due to handovers is an important distinction overlooked by transport layer protocols. Protocol modifications are needed to alleviate handoff induced issues in a growing mobile culture. In this article, findings are presented on transport layer handoff issues in currently deployed networks. MPTCP as a potential solution to addressing handoff- and mobility-related Service Continuity issues is discussed. Finally, a handoff-aware cross-layer assisted MPTCP (CLA-MPTCP) congestion control algorithm is designed and evaluated.
Neco Ventura - One of the best experts on this subject based on the ideXlab platform.
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pmipv6 based make before break handover for real time Services in 3gpps evolved packet core
International Conference on Information Networking, 2013Co-Authors: C John, S Madlopha, Neco VenturaAbstract:To provide an always best connected Service to the end user, the network provider needs to make best use of the various access networks available to the end-user. The infiltration of multi-mode terminals in wireless networks and the introduction of the Evolved Packet Core (EPC) in release 8 of the 3rd Generation Partnership Project (3GPP) specifications make a make-before-break handover an attractive feature to support in the core network, especially for real-time Services which have stringent Service Continuity and packet loss requirements. Proxy Mobile Internet Protocol version 6 (PMIPv6) supports multi-homing where a multi-mode device can connect to more than one access network simultaneously. In this paper we extend the standard multi-homing support of PMIPv6 so that a make-before-break handover can be achieved in the EPC PMIPv6 adoption. A test-bed prototype of the scheme is implemented and testing is performed using IPTV as a model Service for real time Services. The results show that the proposed scheme outperforms the default PMIPv6 scheme in terms of packet loss and handover delay.
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performance evaluation of ims session Continuity signaling with heterogeneous access
Wireless Communications and Networking Conference, 2010Co-Authors: Keoikantse O A Marungwana, Neco VenturaAbstract:The IP Multimedia Subsystem (IMS) Service Continuity is a recent effort by 3GPP towards achieving an enhanced mobility experience for IMS subscribers. It provides mechanisms to manage Continuity of IMS Services, particularly the seamless transfer of multimedia sessions across different access networks, different domains, and the mobility of ongoing sessions across devices of the same user. Functionally, it is mobility management at the IMS Services and applications layer when terminal and session mobility events are visible to the IMS. Although mobility management is a thoroughly explored and extensively documented area of research, the approach has not always been Service-oriented, whereby users are able to actually subscribe to the provisioning of this functionality. This is the new context introduced by IMS Service Continuity. There are, however, few reports on actual implementation and specific practical evaluations of IMS Service Continuity. In this work, we perform a testbed implementation and evaluation of IMS Service Continuity. Particularly, we investigate the signaling aspects of the Service in a heterogeneous wireless networks environment. We develop a prototype Service Continuity application server, and use it with the UCT IMS Client and the FOKUS Open IMS Core to determine the effect of Service Continuity signaling on end user experience.
