1,720,960 research outputs found
A Test System for ERCOT Market Design Studies: Development and Application
Get PDFThe ERCOT Test System developed in this study is an open-source library of Java/Python software classes, together with a synthetic grid construction method, specifically designed to facilitate the study of ERCOT market operations over successive days. In default form, these classes permit a high-level modeling of existing ERCOT market operations. Users can conduct a broad range of computational experiments under alternative parameter settings. In addition, users can readily extend these classes to model additional existing or envisioned ERCOT market features to suit different research purposes. An 8-bus test case is used to illustrate the capabilities of the test system. Ongoing studies making use of the test system to model larger-scale transmission components for integrated transmission and distribution systems are also reported.This working paper is published as Battula, Swathi, Leigh Tesfatsion, and Thomas E. McDermott. "An ERCOT test system for market design studies." Applied Energy 275 (2020): 115182. https://doi.org/10.1016/j.apenergy.2020.11518
Transactive energy system design for integrated transmission and distribution systems
Get PDFThe increased use of variable energy resources in power system operations at both the transmission and distribution levels requires changes to how traditional electricity markets operate to achieve an efficient continual balance of the supply and demand for power. One implication is tighter linkages between transmission and distribution level operations. The availability of smart technology for the management of distributed resources provides an opportunity to consider these issues from a Transactive Energy System (TES) design perspective. A TES design is a collection of economic and control mechanisms permitting the efficient reliable balancing of the supply and demand for power across an entire electrical infrastructure. This thesis proposes a new TES design for the efficient reliable operation of Integrated Transmission and Distribution (ITD) systems. The performance capabilities of this TES design are demonstrated for test cases implemented by means of a newly developed ITD software platform.</p
Transactive energy system design for integrated transmission and distribution systems
Get PDFThe increased use of variable energy resources in power system operations at both the transmission and distribution levels requires changes to how traditional electricity markets operate to achieve an efficient continual balance of the supply and demand for power. One implication is tighter linkages between transmission and distribution level operations. The availability of smart technology for the management of distributed resources provides an opportunity to consider these issues from a Transactive Energy System (TES) design perspective. A TES design is a collection of economic and control mechanisms permitting the efficient reliable balancing of the supply and demand for power across an entire electrical infrastructure. This thesis proposes a new TES design for the efficient reliable operation of Integrated Transmission and Distribution (ITD) systems. The performance capabilities of this TES design are demonstrated for test cases implemented by means of a newly developed ITD software platform
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Analytical SCUC/SCED Optimization Formulation for AMES V5.0
Get PDFU.S. centrally-managed wholesale power markets currently rely on Security-Constrained Unit Commitment (SCUC) and Security Constrained Economic Dispatch (SCED) optimizations to determine unit commitments, reserve, and scheduled dispatch levels for generating units during future operating periods. AMES V5.0 is an open source Java/Python platform that implements a combined SCUC/SCED optimization capturing salient features of these actual market SCUC/SCED optimizations. This report provides extensive documentation for the analytical formulation of the AMES V5.0 SCUC/SCED optimization.</p
Notes on the GridLAB-D Household Equivalent Thermal Parameter Model
Get PDFGridLAB-D (GLD) is an agent-based platform, developed by researchers at Pacific Northwest National Laboratory, that permits users to accurately simulate the state dynamics of power distribution systems at time scales ranging from sub-seconds to years. The purpose of this study is to present, in careful comprehensive form, a complete analytical state-space control representation for a version of the GLD Household Equivalent Thermal Parameter Model as support documentation for model users. This model is a physically-based implementation of a household with multiple price-responsive and conventional appliances whose thermal dynamics are determined over successive days by resident appliance usage and external weather conditions.</p
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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