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Blacksburg, VA, United States

Nazir M.N.,Virginia Polytechnic Institute and State University | Omran S.,Virginia Polytechnic Institute and State University | Broadwater R.,Electrical Distribution Design, Inc.
Electric Power Systems Research | Year: 2016

Distributed Series Reactors (DSRs) can be used to control power flow to more fully utilize the capacity of a transmission network, delaying investment in new transmission lines. In this paper the IEEE 39 bus standard test system is modified to a 3-phase, unbalanced model consisting of 230 kV, 345 kV and 500 kV lines, where lines of different voltage run in parallel. This model is used to study load growth and the effect of adding DSRs to alleviate resulting overloads, and in particular to alleviate overloads on lines of different voltage running in parallel. The economic benefit of adding DSRs to the network is compared to the addition of new transmission lines in the network. In the second part of the paper the effect of unsymmetrical operation of DSRs on a single transmission line is studied and compared to the symmetrical operation of DSRs. It is found that unsymmetrical operation of DSRs is more economical. Finally the unsymmetrical operation of DSRs to reduce voltage imbalance in the network is considered. © 2015 Elsevier B.V. Source

Dilek M.,Electrical Distribution Design, Inc. | De Leon F.,New York University | Broadwater R.,Virginia Polytechnic Institute and State University | Lee S.,Consolidated Edison Company of New York
IEEE Transactions on Power Systems | Year: 2010

This paper presents a sweep-based three-phase power flow method for solving general distribution networks that can be heavily meshed and include transformers around the meshes/loops. A load-stepping technique is proposed for solving common convergence problems of sweep-based load-flow solvers when dealing with overloaded radial sections. The proposed power-flow algorithm is based on the iterative solution of radial subsystems assembled together with the mesh equations to comply with Kirchhoff equations. The proposed method is robust and efficient for the solution of heavily loaded systems. Examples are presented for illustration. © 2010 IEEE. Source

Arghandeh R.,University of California at Berkeley | Woyak J.,Electrical Distribution Design, Inc. | Onen A.,Abdullah Gul University | Jung J.,Brookhaven National Laboratory | Broadwater R.P.,Abdullah Gul University
Applied Energy | Year: 2014

Distributed, controllable energy storage devices offer several benefits to electric power system operation. Three such benefits include reducing peak load, providing standby power, and enhancing power quality. These benefits, however, are only realized during peak load or during an outage, events that are infrequent. This paper presents a means of realizing additional benefits by taking advantage of the fluctuating costs of energy in competitive energy markets. An algorithm for optimal charge/discharge scheduling of Community Energy Storage (CES) devices as well as an analysis of several of the key drivers of the optimization are discussed. © 2014 Elsevier Ltd. Source

Agency: Department of Energy | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 99.29K | Year: 2009

The operation and design of both next generation and conventional power plants will require new simulation approaches that can perform detailed interdependent system analyses at speeds that support real-time operation and control. This project will develop software for an integrated feed water, thermal, steam, and power output model for a conventional steam powered generation plant. If successful, the software will be used to develop a detailed simulation for an Integrated Gasification Combined Cycle (IGCC) plant. The model will be based on Graph Trace Analysis (GTA), which constitutes a new paradigm in integrated system modeling and information management. Commercial Applications and other Benefits as described by the awardee: The use of this technology in modeling experimental and conventional power generation plants should significantly increase the capabilities of the U.S. utility industry. The technology also should find application to the control of a large number of Army, Navy, Homeland Security, and industrial operations.

Agency: Department of Defense | Branch: Army | Program: STTR | Phase: Phase II | Award Amount: 748.69K | Year: 2006

Electrical Distribution Design (EDD), Virginia Tech, Consolidated Edison, Detroit Edison and Sapias propose to develop a web-enabled Distributed Operations Center (DOC) workstation to provide new hazard management analysis capability for coordinating resp

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