1,720,967 research outputs found
Monitoring and Control of a Smart Distribution Network in Extended Real-Time DMS Framework
No full textBased on recently proposed architectures for smart grids, the authors present a monitoring and control structure for distribution networks. The main idea is that, in a near future, Distribution Network Operators (DNOs) will be able to develop on-line smart functions in the extended real-time framework of daily system operation (approximately every 15-30 minutes). The core of the proposed architecture is an advanced Distribution Management System (DMS) whose task is to assess control functions such as reactive dispatch, voltage regulation, contingency analysis, capability maximization or line switching. The monitoring and control structure proposed for this system includes on-line tools such as GIS interface, topology processor, state estimator, load modelling, load flow and optimal distribution power flow (ODPF), control of active and reactive distributed resources, optimal network reconfiguration. Such architecture can also take advantage of existing communication infrastructures, Automatic Meter Reading (AMR) or Advanced Metering Infrastructure (AMI), which guarantee the availability of two-way communication channels. The paper presents, together with the main outline of the proposed control architecture, the results of an on-going research project with AMET, an Italian city-scale electricity Distribution Company (DisCO) that supplies energy to about 35,000 customers, covering an urban area of about 60,000 inhabitants. Possible applications of DMS will be showed running a novel ODPF algorithm on a real representation of AMET distribution system. Test results will also show how basic smart control functions, such as active and reactive control of distributed resources, are compatible with time requirements of extended real-time DMS framework
Integration of optimal reconfiguration tools in advanced distribution management system
No full textThe paper presents results of a smart grid project, currently on-going, in collaboration with an Italian electricity distribution company (DisCo). The project is aimed at defining new optimization tools to be integrated in the SCADA/DMS that is already implemented within the DisCo control center. In this paper, a DMS architecture that includes Optimal Network Reconfiguration (ONR) functions is presented. ONR, being based on data received through a metering infrastructure and a topology processor, can be performed not only for planning, but also in extended real-time during system operation. Test results are presented for two different operative problems and are carried out on a realistic sized model of a distribution network
Operator Training Simulator for power systems: Training evaluation methodologies based on fuzzy logic
No full textOperator training is a relevant aspect of power system operation. In control centers, operators manage the power system through a man machine interface that is a source of further complexity for this critical infrastructure. This paper presents an approach for improving the features of power system Operator Training Simulator (OTS). The OTS program is aimed at training control center operators through the simulation of possible contingency scenarios. The trainees, through simulations, learn to manage the power system during real-time operations and assess on-line dynamic security through the adoption of suitable corrective actions in emergency conditions. Usually, trainees learn only from the experience acquired during the simulation sessions. The OTS is also aimed at improving operator training by adding to the experiential learning the tacit knowledge acquired by senior control center operators. The tacit knowledge can be made explicit and transferred to trainees through well-suited OTS sessions including case studies based on past performed senior operator experiences. The proposed approach is aimed at defining a training evaluation methodology based on fuzzy logic able to reduce the gap between required knowledge and skills and the measured knowledge and skills of operators and to define improvements of each submitted training sessions
L'integrazione di cogenerazione e produzione di idrogeno on-site per la realizzazione di un distretto energetico
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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