370,378 research outputs found
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Initial Northwest Power Act Power Sales Contracts : Final Environmental Impact Statement. Volume 2, Appendices A--L.
No full textThis report consists of appendices A-L of the final environmental impact statement for the Bonneville Power Administration. The appendices provide information on the following: Ninth circuit Court opinion in Forelaws on Board v. Johnson; guide to Northwest Power act contracts; guide to hydro operations; glossary; affected environment supporting documentation; environmental impacts of generic resource types; information on models used; technical information on analysis; public involvement activities; bibliography; Pacific Northwest Electric Power Planning and Conservation Act; and biological assessment. (CBS
Experimental set-up to study power quality in single-phase split-phase distribution systems
No full textPublisher Copyright: © 2023, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.Power Quality (PQ) has been an important topic since the creation of distribution systems. The deployment of the Advanced Metering Infrastructure (AMI) provided an important tool to measure the PQ of the electric power in the consumption points. One of the smallest secondary distribution systems in terms of power consumption is the single-phase split-phase system (120 V/240 V) that countries such as the United States, Canada, and some countries of central and south America have. Due to its size, this secondary distribution system is more prone to PQ issues. To that end, an experimental set-up was built by the authors so the distribution system from the Low Voltage (LV) transformer to the final appliances of the different houses was emulated. The aim is to capture the currents and voltages observed by the smart meter located at the entrance of the house and look for the different responses. A combination of real and dummy loads was installed in the set-up, so real noise could also be simulated. The set-up was totally automated by an industrial controller and relays, and it produced a very detailed dataset that could be used for multiple purposes.The authors gratefully acknowledge the contributions of the Hubbell Research group and the BIKAINTEK funding programme of the Basque Government for the funding of these experiments and also Joseba Jimeno and the technician Roberto Gonzalez for their work done during the construction of this set-up. Authors also wish to thank the collaboration of Izar Lopez-Ramirez during the conduction of the experiments.Peer reviewe
Boys of battle [music] : the 37th Battallion march song : spirited and patriotic /
No full textFor voice and piano.; Cover title.; "This march song has been approved of by Lieut.-Colonel Woods C. O. 37th Battalion."; Sung by the composer, before and in the presence of Sir Ronald Munro Ferguson, Governor General, Brigadier-General M. Williams, officers of the 37th, on the occasion of his Excellencies visit to Seymour for inspection of the Battalion 16/5/16."; "Played by the 37th Battalion band, and sung by the troops when on the march."; "Lance-Corporal ... A coy., 37th Battalion".; On verso of cover is the poem Why I enlisted by Conrad Power.; Also available online http://nla.gov.au/nla.mus-vn3118361
Impact of wind power on the unit commitment, operating reserves and market design
No full textPaper presented at the 2011 IEEE Power and Energy Society General Meeting, San Diego, CA, 24-29 July 2011This article highlights and demonstrates the new requirements variable and partly unpredictable wind power will bring to unit commitment and power system operations.
Current practice is described and contrasted against the new requirements. Literature specifically addressing questions about wind power and unit commitment related power system operations is surveyed. The scope includes forecast errors, operating reserves, intra-day markets, and sharing reserves across interconnections. The discussion covers the critical issues arising from the research.Science Foundation Irelandau, ti, ke, ab, co - TS 10.04.1
Geothermal Power Generation as Related to Resource Requirements
No full textFor the past several years geothermal exploratory work has been conducted in northern Nevada. In conjunction with that effort a proposed 55-MW steam geothermal power plant was considered for initial installation in one of the fields being developed. The characteristics of the geothermal fields under consideration were not firm, with data indicating widely varying downhole temperatures. Thus, neither the resource nor the plant operating conditions could be set. To assist both the ultimate user of the resource, the utility, and the developer of the geothermal field, a series of parametric sensitivity studies were conducted for the initial evaluation of a field vis-a-vis the power plant. Using downhole temperature as the variable, the amount of brine, brine requirements/kWh, and pounds brine/pound of steam to the turbine were ascertained. This was done over a range of downhole temperatures of from 350F to 475F.
The studies illustrate the total interdependence of the geothermal resource and its associated power plant. The selection of geothermal steam power plant design conditions must be related to the field in which the plant is located. The results of the work have proven to be valuable in two major respects: (1) to determine the production required of a particular geothermal field to meet electrical generation output and (2) as field characteristics become firm, operating conditions can be defined for the associated power plant
Power and energy management of multiple energy storage systems in electric vehicles
No full textThis dissertation contributes to the problem description of managing power and energy of
multiple energy sources for electric vehicle power system architectures. The area of power
and energy management in the application domain of electric vehicles is relatively new and encompasses several different disciplines. Primarily, the challenges in electric vehicles having multiple energy storage systems lies in managing the energy expenditure, determining the proportional power splits and establishing methods to interface between the energy systems
so as to meet the demands of the vehicle propulsion and auxiliary load requirements.
In this work, an attempt has been made to provide a new perspective to the problem
description of electric vehicle power and energy management. The overall approach to the problem borrows from the basic principles found in conventional management
methodology. The analogy between well-known hierarchical management concepts and
power and energy management under timing constraints in a general task-graph is exploited to form a well-defined modular power and energy management implementation structure.
The proposed methodology permits this multidisciplinary problem to be approached
systematically. The thesis introduces a modular power and energy management system (MPEMS). Operation of the M-PEMS is structured as tri-level hierarchical process shells. An Energy Management Shell (EMS) handles the long-term decisions of energy usage in relation to the longitudinal dynamics of the vehicle while processes within a Power Management Shell (PMS) handles the fast decisions to determine power split ratios between multiple
energy sources. Finally, a Power Electronics Shell (PES) encompasses the essential power
interfacing circuitry as well as the generation of low-level switching functions.
This novel framework is demonstrated with the implementation of a power and
energy management system for a dual-source electric vehicle powered by lead acid batteries and ultracapacitors. A series of macro simulations of the energy systems validated against practical tests were performed to establish salient operating parameters. These parameters were then applied to the M-PEMS design of a demonstrator vehicle to determine both the
general effectiveness of a power and energy management scheme and to support the validity
of the new framework. Implementation of the modular blocks that composes the entire
system architecture is described with emphasis given to the power electronics shell
infrastructure design. The modular structure approach is design-implementation oriented,
with the objective of contributing towards a more unified description of the electric vehicle power and energy management problem
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General Electric Atomic Power Equipment Department Report GEAP-3632
No full textFrom introduction: "Development of nuclear reactor cores having high power density, long fuel life, and low fabrication costs is the objective of this program sponsored by the AEC.
Multi-timescale Modeling of Fast Charging Stations for Power Quality Analysis
No full textTo accurately simulate the harmonic emission of EV DC fast chargers (DCFCs) and the harmonic voltage of the power grid to which the chargers are connected, a small time-step, i.e., typically smaller than 10μs, is required. However, for harmonic assessment, a long timescale, typically a day, is required. A conflict between accuracy and time efficiency exists. To address this issue, a multitimescale modeling framework of fast charging stations (FCSs) is proposed in this paper. In the presented framework, the DCFCs’ input impedance and harmonic current emission in the ideal grid condition, i.e., the grid impedance is zero and there are no background harmonic voltages, is obtained firstly through a converter switch model with a small timescale. Since the DCFC’s input impedance and harmonic current source change in the charging course, the input impedance and harmonic emission at different input power should be obtained. Then, the DCFCs’ input impedance and harmonic emission will be used in the fast-charging station modeling, where the DCFCs are simplified as their Norton equivalent circuits. In the station level modeling, a bigger time step, i.e., 1 minute, is used, since the DCFCs’ operating power can be assumed as a constant in one minute. With this framework, the FCSs’ long-term power quality performance can be assessed efficiently without neglecting the DCFCs’ small timescale dynamics.Accepted Author ManuscriptDC systems, Energy conversion & Storag
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Atomic Power Development Associates Bulletin APDA-158
No full textReport issued by the APDA over studies conducted on "methods for increasing the power generation in a fast reactor fuel element test sample" (p. 9). The methods investigated are presented and discussed. This report includes tables, and illustrations
Control strategies for a wave energy converter connected to a hydraulic power take-off
No full textAmong the various types of wave energy converters currently being developed, heaving point absorbers are one of the simplest and most promising concepts. A typical efficient energy conversion system for point absorbers is based on hydraulic power take-off (PTO) systems, consisting in a double-acting cylinder, a hydraulic motor and two or more accumulators. This paper presents a simple model of a heaving oscillating buoy extracting power by means of a hydraulic system. The hydrodynamic behaviour of the absorber is modelled through application of the linear water wave theory. Apart from the basic elements listed above, the model of the hydraulic system includes leakages and pressure losses and takes into account the compressibility of the fluid. Also, possible control accumulators are considered in order to improve the performance of the hydraulic system by means of properly controlled valves. Different control variables are analysed depending on the wave inputs considered in order to improve the power extraction of the converter. The results prove that it is possible to achieve a great enhancement of the power extraction with the implementation of these control strategies and that a possible combination of some of them might be beneficial for improved efficiency of the components.Peer reviewe
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