The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Edoardo Patti - One of the best experts on this subject based on the ideXlab platform.
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a sgam based test platform to develop a scheme for wide area measurement free monitoring of smart grids under high pv penetration
Energies, 2019Co-Authors: Abouzar Estebsari, Luca Barbierato, Alireza Bahmanyar, Lorenzo Bottaccioli, Enrico Macii, Edoardo PattiAbstract:In order to systematically shift existing control and management paradigms in distribution systems to new interoperable communication supported schemes in smart grids, we need to map newly developed use cases to standard reference models like Smart Grid Architecture Model (SGAM). From the other side, any new use cases should be tested and validated ex-ante before being deployed in the real-world system. Considering various types of actors in smart grids, use cases are usually tested using co-simulation platforms. Currently, there is no efficient co-simulation platform which supports interoperability analysis based on SGAM. In this paper, we present our developed test platform which offers a support to design new use cases based on SGAM. We used this platform to develop a new scheme for wide area monitoring of existing distribution systems under growing penetration of Photovoltaic production. Off-the-shelf solutions of state estimation for wide area monitoring are either used for passive distribution grids or applied to the Active Networks with wide measurement of distributed generators. Our proposed distribution state estimation algorithm does not require wide area measurements and relies on the data provided by a PV simulator we developed. This practical scheme is tested experimentally on a realistic urban distribution grid. The monitoring results shows a very low error rate of about 1 % by using our PV simulator under high penetration of PV with about 30 % error of load forecast. Using our SGAM-based platform, we could propose and examine an Internet-of-Things-based infrastructure to deploy the use case.
Daniel L Blair - One of the best experts on this subject based on the ideXlab platform.
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shear induced gelation of self yielding Active Networks
Physical Review Letters, 2020Co-Authors: David A Gagnon, Claudia Dessi, John Berezney, Remi Boros, Daniel T N Chen, Zvonimir Dogic, Daniel L BlairAbstract:An enticing feature of Active materials is the possibility of controlling macroscale rheological properties through the activity of the microscopic constituents. Using a unique combination of microscopy and rheology we study three dimensional microtubule-based Active materials whose autonomous flows are powered by a continually rearranging connected network. We quantify the relationship between the microscopic dynamics and the bulk mechanical properties of these nonequilibrium Networks. Experiments reveal a surprising nonmonotonic viscosity that strongly depends on the relative magnitude of the rate of internally generated activity and the externally applied shear. A simple two-state mechanical model that accounts for both the solidlike and yielded fluidlike elements of the network accurately describes the rheological measurements.
D.j. Wetherall - One of the best experts on this subject based on the ideXlab platform.
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Towards an Active network architecture
Proceedings - DARPA Active Networks Conference and Exposition DANCE 2002, 2002Co-Authors: D L Tennenhouse, D.j. WetherallAbstract:Active Networks allow their users to inject customized programs into the nodes of the network. An extreme case, in which we are most interested, replaces packets with "capsules" - program fragments that are executed at each network router/switch they traverse. Active architectures permit a massive increase in the sophistication of the computation that is performed within the network. They will enable new applications, especially those based on application-specific multicast, information fusion, and other services that leverage network-based computation and storage. Furthermore, they will accelerate the pace of innovation by decoupling network services from the underlying hardware and allowing new services to be loaded into the infrastructure on demand. In this paper, we describe our vision of an Active network architecture, outline our approach to its design, and survey the technologies that can be brought to bear on its implementation. We propose that the research community mount a joint effort to develop and deploy a wide area ActiveNet.
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Active network vision and reality lessions from a capsule based system
Symposium on Operating Systems Principles, 1999Co-Authors: D.j. WetherallAbstract:Although Active Networks have generated much debate in the research community, on the whole there has been little hard evidence to inform this debate. This paper aims to redress the situation by reporting what we have learned by designing, implementing and using the ANTS Active network toolkit over the past two years. At this early stage, Active Networks remain an open research area. However, we believe that we have made substantial progress towards providing a more flexible network layer while at the same time addressing the performance and security concerns raised by the presence of mobile code in the network. In this paper, we argue our progress towards the original vision and the difficulties that we have not yet resolved in three areas that characterize a "pure" Active network: the capsule model of programmability; the accessibility of that model to all users; and the applications that can be constructed in practice.
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a survey of Active network research
IEEE Communications Magazine, 1997Co-Authors: D L Tennenhouse, D.j. Wetherall, Jonathan M Smith, W D Sincoskie, G MindenAbstract:Active Networks are a novel approach to network architecture in which the switches (or routers) of the network perform customized computations on the messages flowing through them. This approach is motivated by both lead user applications, which perform user-driven computation at nodes within the network today, and the emergence of mobile code technologies that make dynamic network service innovation attainable. The authors discuss two approaches to the realization of Active Networks and provide a snapshot of the current research issues and activities. They illustrate how the routers of an IP network could be augmented to perform such customized processing on the datagrams flowing through them. These Active routers could also interoperate with legacy routers, which transparently forward datagrams in the traditional manner.
Abouzar Estebsari - One of the best experts on this subject based on the ideXlab platform.
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a sgam based test platform to develop a scheme for wide area measurement free monitoring of smart grids under high pv penetration
Energies, 2019Co-Authors: Abouzar Estebsari, Luca Barbierato, Alireza Bahmanyar, Lorenzo Bottaccioli, Enrico Macii, Edoardo PattiAbstract:In order to systematically shift existing control and management paradigms in distribution systems to new interoperable communication supported schemes in smart grids, we need to map newly developed use cases to standard reference models like Smart Grid Architecture Model (SGAM). From the other side, any new use cases should be tested and validated ex-ante before being deployed in the real-world system. Considering various types of actors in smart grids, use cases are usually tested using co-simulation platforms. Currently, there is no efficient co-simulation platform which supports interoperability analysis based on SGAM. In this paper, we present our developed test platform which offers a support to design new use cases based on SGAM. We used this platform to develop a new scheme for wide area monitoring of existing distribution systems under growing penetration of Photovoltaic production. Off-the-shelf solutions of state estimation for wide area monitoring are either used for passive distribution grids or applied to the Active Networks with wide measurement of distributed generators. Our proposed distribution state estimation algorithm does not require wide area measurements and relies on the data provided by a PV simulator we developed. This practical scheme is tested experimentally on a realistic urban distribution grid. The monitoring results shows a very low error rate of about 1 % by using our PV simulator under high penetration of PV with about 30 % error of load forecast. Using our SGAM-based platform, we could propose and examine an Internet-of-Things-based infrastructure to deploy the use case.
Ali Akbar Gharaveisi - One of the best experts on this subject based on the ideXlab platform.
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optimum islanded microgrid reconfiguration based on maximization of system loadability and minimization of power losses
International Journal of Electrical Power & Energy Systems, 2016Co-Authors: Mohammad Hasan Hemmatpour, Mohsen Mohammadian, Ali Akbar GharaveisiAbstract:Abstract Distribution grids are being transformed from passive to Active Networks. The Active distribution systems are constructed through the implementation of microgrids (MGs) which are characterized as the “building blocks of smart grids”. This type of network eases the integration of distributed generation into power Networks and makes it possible to define a new index for voltage stability, power flow development and a development reconfiguration method. In this paper, an improved indicator is proposed to estimate the voltage stability margin of a two-bus system based on both saddle node and limited induced bifurcations. A new concept named reduced islanded MG network (RIN), is used for generalization of the proposed index to n-bus islanded MGs and a development power flow algorithm by splitting these Networks. The increasing loadability index of microgrids in the islanding mode is more important than the index of the grid-connected mode due to its operational limitations such as reActive power generation. In this process, islanded microgrid reconfiguration (IMGR) is proposed as an operational tool for improving loadability as well as decreasing power losses using an Adaptive Multi Objective Harmony Search Algorithm. The performance and effectiveness of the proposed method are demonstrated on 33- and 69-bus test systems.
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simple and efficient method for steady state voltage stability analysis of islanded microgrids with considering wind turbine generation and frequency deviation
Iet Generation Transmission & Distribution, 2016Co-Authors: Mohammad Hasan Hemmatpour, Mohsen Mohammadian, Ali Akbar GharaveisiAbstract:Distribution grids are being transformed from passive to Active Networks. The Active distribution systems are constructed through the implementation of microgrids (MGs) which are characterised as ‘the building blocks of smart grids’. This type of network eases the integration of distributed generation into power Networks and makes it possible to define a new index for voltage stability. The penetration of renewable power sources such as wind turbines can create new challenges in this system that will affect voltage stability index (VSI). In this study, an improved indicator is proposed to estimate the voltage stability margin of a two-bus system based on both saddle node and limited induced bifurcations considering different types of load model. The catastrophe theory is used to define this new VSI of an islanded MG (IMG), called as cat_VSI IMG. A new concept, named reduced IMG network, is also used to generalise the proposed index to n-bus IMGs by splitting these Networks. The cat_VSI IMG, which is validated by a verified continuation power flow method for IMGs is called the maximum loadability margin of IMG. The performance and effectiveness of the proposed method are demonstrated on 33-bus and 69-bus test systems for different types of load model.
