Sample records for optimized generator operation

  1. Method and apparatus for optimizing operation of a power generating plant using artificial intelligence techniques

    DOE Patents [OSTI]

    Wroblewski, David (Mentor, OH); Katrompas, Alexander M. (Concord, OH); Parikh, Neel J. (Richmond Heights, OH)

    2009-09-01T23:59:59.000Z

    A method and apparatus for optimizing the operation of a power generating plant using artificial intelligence techniques. One or more decisions D are determined for at least one consecutive time increment, where at least one of the decisions D is associated with a discrete variable for the operation of a power plant device in the power generating plant. In an illustrated embodiment, the power plant device is a soot cleaning device associated with a boiler.

  2. OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION,

    E-Print Network [OSTI]

    Stanford University

    OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION, CO2 CAPTURE AND WIND A THESIS SUBMITTED TO THE DEPARTMENT OF ENERGY RESOURCES ENGINEERING OF STANFORD UNIVERSITY of Master of Science in Energy Resources Engineering. (Louis J. Durlofsky) Principal Co-Adviser I certify

  3. OPTIMAL OPERATION OF INTEGRATED PROCESSES

    E-Print Network [OSTI]

    Skogestad, Sigurd

    OPTIMAL OPERATION OF INTEGRATED PROCESSES Studies on Heat Recovery Systems by Bjørn Glemmestad exchanger network (HEN) for heat recovery. Within the process engineering community, much attention has been

  4. The EXODUS Optimizer Generator Goetz Graefe

    E-Print Network [OSTI]

    Liblit, Ben

    . Algebraic transformation rules are translated into an execut- able query optimizer, which transforms query for an existing operator in the query language. To achieve this, the EXODUS design consists of a powerful, highlyThe EXODUS Optimizer Generator Goetz Graefe David J. DeWitt Computer Sciences Department University

  5. Optimization of Wind Turbine Operation

    E-Print Network [OSTI]

    Optimization of Wind Turbine Operation by Use of Spinner Anemometer TF Pedersen, NN Sørensen, L Title: Optimization of Wind Turbine Operation by Use of Spinner Anemometer Department: Wind Energy prototype wind turbine. Statistics of the yaw error showed an average of about 10°. The average flow

  6. Optimizing Installation, Operation, and Maintenance at Offshore...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Optimizing Installation, Operation, and Maintenance at Offshore Wind Projects in the United States Optimizing Installation, Operation, and Maintenance at Offshore Wind Projects in...

  7. Operating Reserves and Variable Generation

    SciTech Connect (OSTI)

    Ela, E.; Milligan, M.; Kirby, B.

    2011-08-01T23:59:59.000Z

    This report tries to first generalize the requirements of the power system as it relates to the needs of operating reserves. It also includes a survey of operating reserves and how they are managed internationally in system operations today and then how new studies and research are proposing they may be managed in the future with higher penetrations of variable generation.

  8. Simulation and Optimization of Wind Farm Operations under Stochastic Conditions

    E-Print Network [OSTI]

    Byon, Eunshin

    2011-08-08T23:59:59.000Z

    This dissertation develops a new methodology and associated solution tools to achieve optimal operations and maintenance strategies for wind turbines, helping reduce operational costs and enhance the marketability of wind generation. The integrated...

  9. Web-Based Method to Generate Specific Energy Consumption Data for the Evaluation and Optimization of Building Operation

    E-Print Network [OSTI]

    Wagner, A.; Wambsgan, M.; Froehlich, S.

    2004-01-01T23:59:59.000Z

    about energy consumptionand specific data especially in large building stocks?user complaints and energy consumption arerarely considered in building operation?reduction of energy consumption and operation costsas well as ensuring a high work space... consumption specific heating energy consumption buildings with additional technical usage (control room)without arithmetic mean consumption related to the heated net floor area; data measured one full year: 02-2001 to 02-2002 specific yearly energy...

  10. Optimization Online - Operations Risk Management by Planning ...

    E-Print Network [OSTI]

    Emmanuel Fragnière

    2007-08-01T23:59:59.000Z

    Aug 1, 2007 ... Operations Risk Management by Planning Optimally the Qualified Workforce Capacity. Emmanuel Fragnière(Emmanuel.Fragniere ***at*** ...

  11. Deriving Optimal Operational Rules for Mitigating Inter-area Oscillations

    SciTech Connect (OSTI)

    Diao, Ruisheng; Huang, Zhenyu; Zhou, Ning; Chen, Yousu; Tuffner, Francis K.; Fuller, Jason C.; Jin, Shuangshuang; Dagle, Jeffery E.

    2011-05-23T23:59:59.000Z

    This paper introduces a new method to mitigate inter-area oscillations of a large scale interconnected power system by means of generation re-dispatch. The optimal operational control procedures are derived as the shortest distance from the current operating condition to a desired damping ratio of the oscillation mode by adjusting generator outputs. A sensitivity based method is used to select the most effective generators for generation re-dispatch and decision tree is trained to approximate the security boundary in a space characterized by the selected generators. The optimal operational rules can be found by solving an optimization problem where the boundary constraints are provided by the decision tree rules. This method is tested on a Western Electricity Coordinating Council (WECC) 179-bus simplified network model and simulation results have demonstrated the proof of concept and shown promising application in real time operation.

  12. Operating strategy generators for nuclear reactors

    SciTech Connect (OSTI)

    Solovyev, D. A., E-mail: and@est.mephi.ru; Semenov, A. A.; Shchukin, N. V. [National Research Nuclear University MEPhI (Russian Federation)

    2011-12-15T23:59:59.000Z

    Operating strategy generators, i.e., the software intended for increasing the efficiency of work of nuclear power plant operators, are discussed. The possibilities provided by the domestic and foreign operating-strategy generators are analyzed.

  13. Optimal operating strategy for a storage facility

    E-Print Network [OSTI]

    Zhai, Ning

    2008-01-01T23:59:59.000Z

    In the thesis, I derive the optimal operating strategy to maximize the value of a storage facility by exploiting the properties in the underlying natural gas spot price. To achieve the objective, I investigate the optimal ...

  14. Jrgen Bauck Jensen Optimal Operation of Refrigera-

    E-Print Network [OSTI]

    Skogestad, Sigurd

    and compared with the Tmin-method. Considering the large amount of work that goes into the design of LNG LNG process is used as an example for optimal design and optimal operation of LNG processes

  15. Optimizing Asset Utilization and Operating Efficiency Efficiently...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    also part of the solution for Smart Grid Optimizing Asset Utilization and Operating Efficien Efficientl More Documents & Publications Metrics for Measuring Progress Toward...

  16. Optimization Online - Dynamic Generation of Scenario Trees

    E-Print Network [OSTI]

    G. Ch. Pflug

    2014-09-03T23:59:59.000Z

    Sep 3, 2014 ... Abstract: We present new algorithms for the dynamic generation of scenario trees for multistage stochastic optimization. The different methods ...

  17. Toward optimized code generation through model-based optimization

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Toward optimized code generation through model- based optimization Asma Charfi, Chokri Mraidha.gerard, francois.terrier}@cea.fr Pierre Boulet LIFL, CNRS/INRIA, Université de Lille 1, Parc de la Haute Borne, Bât tools like synthesis of system's application by automatic code generation. Real-Time and Embedded

  18. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    LBNL-54447. Distributed Generation Dispatch OptimizationA Business Case for On-Site Generation: The BD Biosciencesrelated work. Distributed Generation Dispatch Optimization

  19. Optimization Online - Disruption Management - Operations ...

    E-Print Network [OSTI]

    Jens Clausen

    2001-11-12T23:59:59.000Z

    Nov 12, 2001 ... Jesper Hansen (jha ***at*** imm.dtu.dk). Abstract: For a large number of applications Operations Research has a proven track record: it can ...

  20. Distributed Generation Operational Reliability and Availability...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Reliability and Availability Database, Final Report, January 2004 Distributed Generation Operational Reliability and Availability Database, Final Report, January 2004 This final...

  1. Optimizing Blast Furnace Operation to Increase Efficiency and...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Optimizing Blast Furnace Operation to Increase Efficiency and Lower Costs Optimizing Blast Furnace Operation to Increase Efficiency and Lower Costs cfdblastfurnace.pdf More...

  2. Optimization of Water Consumption in Second Generation Bioethanol Plants

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 Optimization of Water Consumption in Second Generation Bioethanol Plants Mariano Martína optimization of second generation bioethanol production plants from lignocellulosic switchgrass when using

  3. Model-Based Transient Calibration Optimization for Next Generation...

    Broader source: Energy.gov (indexed) [DOE]

    Model-Based Transient Calibration Optimization for Next Generation Diesel Engines Model-Based Transient Calibration Optimization for Next Generation Diesel Engines 2005 Diesel...

  4. Method of operating a thermoelectric generator

    DOE Patents [OSTI]

    Reynolds, Michael G; Cowgill, Joshua D

    2013-11-05T23:59:59.000Z

    A method for operating a thermoelectric generator supplying a variable-load component includes commanding the variable-load component to operate at a first output and determining a first load current and a first load voltage to the variable-load component while operating at the commanded first output. The method also includes commanding the variable-load component to operate at a second output and determining a second load current and a second load voltage to the variable-load component while operating at the commanded second output. The method includes calculating a maximum power output of the thermoelectric generator from the determined first load current and voltage and the determined second load current and voltage, and commanding the variable-load component to operate at a third output. The commanded third output is configured to draw the calculated maximum power output from the thermoelectric generator.

  5. Optimal Fusion Transformations for Linear Optical Cluster State Generation

    E-Print Network [OSTI]

    D. B. Uskov; P. Lougovski; P. M. Alsing; M. L. Fanto; L. Kaplan; A. M. Smith

    2014-07-22T23:59:59.000Z

    We analyze the generation of linear optical cluster states (LOCS) via addition of one and two qubits. Existing approaches employ the stochastic linear optical two-qubit CZ gate with success rate of 1/9 per fusion operation. The question of optimality of the CZ gate with respect to LOCS generation remains open. We report that there are alternative schemes to the CZ gate that are exponentially more efficient and show that sequential LOCS growth is globally optimal. We find that the optimal cluster growth operation is a state transformation on a subspace of the full Hilbert space. We show that the maximal success rate of fusing n photonic qubits or m Bell pairs is 1/2^n-1 and 1/4^m-1 respectively and give an explicit optical design.

  6. Modeling Operational Constraints imposed by Renewable Generation

    E-Print Network [OSTI]

    Daniels, Thomas E.

    4 #12;Operational effects into NETPLAN G LX L T R 5 #12;Effect of Wind on Load Following 10 min, that include: Regulation, Intra-hour and inter-hour load following, Contingency reserves, Generation cycling

  7. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    time of use United States Postal Service v Distributed Generation Dispatch Optimization Under Various Electricity Tariffs

  8. Optimal Hydropower Reservoir Operation with Environmental Requirements MARCELO ALBERTO OLIVARES

    E-Print Network [OSTI]

    Lund, Jay R.

    Optimal Hydropower Reservoir Operation with Environmental Requirements By MARCELO ALBERTO OLIVARES Engineering Optimal Hydropower Reservoir Operation with Environmental Requirements Abstract Engineering solutions to the environmental impacts of hydropower operations on downstream aquatic ecosystem are studied

  9. Optimal generation of entanglement under local control

    E-Print Network [OSTI]

    Raffaele Romano; Alessio Del Fabbro

    2007-07-11T23:59:59.000Z

    We study the optimal generation of entanglement between two qubits subject to local unitary control. With the only assumptions of linear control and unitary dynamics, by means of a numerical protocol based on the variational approach (Pontryagin's Minimum Principle), we evaluate the optimal control strategy leading to the maximal achievable entanglement in an arbitrary interaction time, taking into account the energy cost associated to the controls. In our model we can arbitrarily choose the relative weight between a large entanglement and a small energy cost.

  10. OPTIMIZATION OF OPERATIONAL CHARACTERISTICS OF SHOTBLASTING TURBINE

    E-Print Network [OSTI]

    Aleš Hribernik; Bojan A?ko; Gorazd Bombek

    A parametric study has been performed in order to optimize the operational characteristics of shotblasting turbine used for surface cleaning of metal products in foundries. The study has been focused on four main parameters: shot velocity, shot distribution, shot mass flow and turbine efficiency. Different turbine designs were experimentally studied which enabled the influence factors to be identified and then quantified by means of comparison of original and modified turbine characteristics. The step-by-step optimization was then performed which resulted in redesigned shotblasting turbine with improved operational characteristics. Up to 35 % higher maximum massflow rate of shot particles has been achieved and turbine efficiency has been improved by more than 6 %. Just slight reduction of shot flow velocity was observed (only 2 %), which confirms an important improvement of shotblasting potentials of new turbine.

  11. Optimization of auxiliary power systems design for large generating units

    SciTech Connect (OSTI)

    Fabri, E.I.; Kang, E.K.; Dusterdick, R.W.

    1980-01-01T23:59:59.000Z

    Modern fossil and nuclear generating units require the support of a fairly large and complex electric auxiliary power system. The selection of an optimized and cost-effective auxiliary power transformer rating may be a difficult process, since the loading profile and coincident operation of the loads often cannot be firmly defined at an early stage of design. The authors believe that this important design process could be greatly aided by systematic field tests and recording of the actual auxiliary loading profiles during various modes of plant operations.

  12. Optimal operation of large-scale power systems

    SciTech Connect (OSTI)

    Lee, K.Y.; Ortiz, J.L.; Mohtadi, M.A.; Park, Y.M.

    1988-05-01T23:59:59.000Z

    This paper presents a method for an optimal operation of large-scale power systems similar to the one utilized by the Houston Lighting and Power Company. The main objective is to minimize the system fuel costs, and maintain an acceptable system performance in terms of limits on generator real and reactive power outputs, transformer tap settings, and bus voltage levels. Minimizing the fuel costs of such large-scale systems enhances the performance of optimal real power generator allocation and of optimal power flow that results in an economic dispatch. The gradient projection method (GPM) is utilized in solving the optimization problems. It is an iterative numerical procedure for finding an extremum of a function of several variables that are required to satisfy various constraining relations without using penalty functions or Lagrange multipliers among other advantages. Mathematical models are developed to represent the sensitivity relationships between dependent and control variables for both real- and reactive-power optimization procedures; and thus eliminate the use of B-coefficients. Data provided by the Houston lighting and Power Company are used to demonstrate the effectiveness of the proposed procedures.

  13. Operation of Distributed Generation Under Stochastic Prices

    SciTech Connect (OSTI)

    Siddiqui, Afzal S.; Marnay, Chris

    2005-11-30T23:59:59.000Z

    We model the operating decisions of a commercial enterprisethatneeds to satisfy its periodic electricity demand with either on-sitedistributed generation (DG) or purchases from the wholesale market. Whilethe former option involves electricity generation at relatively high andpossibly stochastic costs from a set of capacity-constrained DGtechnologies, the latter implies unlimited open-market transactions atstochastic prices. A stochastic dynamic programme (SDP) is used to solvethe resulting optimisation problem. By solving the SDP with and withoutthe availability of DG units, the implied option values of the DG unitsare obtained.

  14. AUTOMATIC GENERATION OF OPTIMAL CONTROLLERS THROUGH MODEL CHECKING TECHNIQUES

    E-Print Network [OSTI]

    Tronci, Enrico

    AUTOMATIC GENERATION OF OPTIMAL CONTROLLERS THROUGH MODEL CHECKING TECHNIQUES Giuseppe Della Penna Keywords: Controller Synthesis, Controller Optimization, Model Checking, Nonlinear Systems Abstract: We INTRODUCTION Control systems (or, shortly, controllers) are small hardware/software components that control

  15. Optimal Planning and Operation of Smart Grids with Electric Vehicle Interconnection

    E-Print Network [OSTI]

    Stadler, Michael

    2012-01-01T23:59:59.000Z

    Optimal Planning and Operation of Smart Grids with ElectricOptimal Planning and Operation of Smart Grids with Electric

  16. Optimal Technology Selection and Operation of Microgrids in Commercial Buildings

    E-Print Network [OSTI]

    Marnay, Chris; Venkataramanan, Giri; Stadler, Michael; Siddiqui, Afzal; Firestone, Ryan; Chandran, Bala

    2008-01-01T23:59:59.000Z

    L ABORATORY Optimal Technology Selection and Operation ofEnvironmental Energy Technologies Division 15 January 2007for Electric Reliability Technology Solutions with funding

  17. Computational Research Challenges and Opportunities for the Optimization of Fossil Energy Power Generation System

    SciTech Connect (OSTI)

    Zitney, S.E.

    2007-06-01T23:59:59.000Z

    Emerging fossil energy power generation systems must operate with unprecedented efficiency and near-zero emissions, while optimizing profitably amid cost fluctuations for raw materials, finished products, and energy. To help address these challenges, the fossil energy industry will have to rely increasingly on the use advanced computational tools for modeling and simulating complex process systems. In this paper, we present the computational research challenges and opportunities for the optimization of fossil energy power generation systems across the plant lifecycle from process synthesis and design to plant operations. We also look beyond the plant gates to discuss research challenges and opportunities for enterprise-wide optimization, including planning, scheduling, and supply chain technologies.

  18. Cut Generation for Optimization Problems with Multivariate Risk ...

    E-Print Network [OSTI]

    Simge Küçükyavuz

    2014-07-26T23:59:59.000Z

    Jul 26, 2014 ... Cut Generation for Optimization Problems with Multivariate Risk Constraints. Simge Küçükyavuz (kucukyavuz.2 ***at*** osu.edu) Nilay Noyan ...

  19. Optimization of the Heating System Operation

    E-Print Network [OSTI]

    Xu, W.; Mao, S.

    2006-01-01T23:59:59.000Z

    on the basis of the variation of outdoor temperature, and in this way, the heating system can be optimized....

  20. Distributed Generation Operational Reliability, Executive Summary...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2004 This report summarizes the results of the project, "Distributed Generation Market Transformation Tools: Distributed Generation Reliability and Availability Database,"...

  1. Operator preconditioning for a class of constrained optimal control problems

    E-Print Network [OSTI]

    Nabben, Reinhard

    - tioned iterative solver for the linear systems that occur in PDE constrained optimization. In particularOperator preconditioning for a class of constrained optimal control problems Anton Schiela & Stefan equations that arise in PDE constrained optimal control in the framework of conjugate gradient methods. Our

  2. Sensitivity of Optimal Operation of an Activated Sludge Process Model

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Sensitivity of Optimal Operation of an Activated Sludge Process Model Antonio Araujo, Simone sensitivity analysis of optimal operation conducted on an activated sludge process model based on the test.[7] applied a systematic procedure for control structure design of an activated sludge process

  3. Active constraint regions for optimal operation of distillation columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Active constraint regions for optimal operation of distillation columns Magnus G. Jacobsen the control structure of distillation columns, with optimal operation in mind, it is important to know how for distillation columns change with variations in energy cost and feed flow rate. The production of the most

  4. OPTIMAL SYNTHESIS, DESIGN AND OPERATION OF HYBRID SEPARATION PROCESSES

    E-Print Network [OSTI]

    Blandford, Ann

    or low relative volatilities. In a hybrid process where a distillation column unit and a pervaporation was to study the optimal configuration, design and operation of hybrid distillation/ membrane processes takingOPTIMAL SYNTHESIS, DESIGN AND OPERATION OF HYBRID SEPARATION PROCESSES Taj*alasfiaM. M. Barakat

  5. STUDIES ON OPTIMAL DESIGN AND OPERATION OF INTEGRATED

    E-Print Network [OSTI]

    Skogestad, Sigurd

    STUDIES ON OPTIMAL DESIGN AND OPERATION OF INTEGRATED DISTILLATION ARRANGEMENTS by Atle Christer we consider means for direct coupling of distillation columns, so as to use the underlying physics of this work to increase the the understanding of such columns, in terms of (optimal) operation and design

  6. Institute of Operations Research Discrete Optimization and Logistics

    E-Print Network [OSTI]

    Al Hanbali, Ahmad

    Institute of Operations Research Discrete Optimization and Logistics 1 Prof. Dr. Stefan Nickel ­ Health Care Logistics: Overview Health Care Logistics 11/28/2013 #12;Institute of Operations Research Discrete Optimization and Logistics 2 Prof. Dr. Stefan Nickel ­ Health Care Logistics: Overview Health Care

  7. Some Applications of Polynomial Optimization in Operations ...

    E-Print Network [OSTI]

    2015-04-09T23:59:59.000Z

    teed signal quality and minimum transmission power, (ii) computing real-time ... applications of sum of squares techniques in optimization and control.

  8. Stochastic Co-optimization for Hydro-Electric Power Generation

    E-Print Network [OSTI]

    1 Stochastic Co-optimization for Hydro-Electric Power Generation Shi-Jie Deng, Senior Member, IEEE the optimal scheduling problem faced by a hydro-electric power producer that simultaneously participates in multiple markets. Specifically, the hydro-generator participates in both the electricity spot market

  9. SYSTEMS OPTIMIZATION LABORATORY DEPARTMENT OF OPERATIONS RESEARCH

    E-Print Network [OSTI]

    Stanford University

    Liquefaction Coal Gasification Thermal Electric Power Generation Oil Shale Conversion Fuel Refining Coal Slurry

  10. Applications of Optimal Building Energy System Selection and Operation

    SciTech Connect (OSTI)

    Marnay, Chris; Stadler, Michael; Siddiqui, Afzal; DeForest, Nicholas; Donadee, Jon; Bhattacharya, Prajesh; Lai, Judy

    2011-04-01T23:59:59.000Z

    Berkeley Lab has been developing the Distributed Energy Resources Customer Adoption Model (DER-CAM) for several years. Given load curves for energy services requirements in a building microgrid (u grid), fuel costs and other economic inputs, and a menu of available technologies, DER-CAM finds the optimum equipment fleet and its optimum operating schedule using a mixed integer linear programming approach. This capability is being applied using a software as a service (SaaS) model. Optimisation problems are set up on a Berkeley Lab server and clients can execute their jobs as needed, typically daily. The evolution of this approach is demonstrated by description of three ongoing projects. The first is a public access web site focused on solar photovoltaic generation and battery viability at large commercial and industrial customer sites. The second is a building CO2 emissions reduction operations problem for a University of California, Davis student dining hall for which potential investments are also considered. And the third, is both a battery selection problem and a rolling operating schedule problem for a large County Jail. Together these examples show that optimization of building u grid design and operation can be effectively achieved using SaaS.

  11. Utility Systems Management and Operational Optimization

    E-Print Network [OSTI]

    Dhole, V.; Seillier, D.; Garza, K.

    simultaneously within the context of an integrated utilities management objective. Aspen Utilities™ provides a single environment to optimize business processes relating to utilities management and substantially improves financial performance typically equivalent...

  12. Variable speed operation of generators with rotor-speed feedback in wind power applications

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C.P.; Migliore, P.

    1995-11-01T23:59:59.000Z

    The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable-speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable-speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy we analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. in extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

  13. Variable speed operation of generators with rotor-speed feedback in wind power applications

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C.P.; Migliore, P. [National Renewable Energy Lab., Golden, CO (United States). Wind Technology Div.

    1996-10-01T23:59:59.000Z

    The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable-speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable-speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy analyzed uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. In extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

  14. Variable speed operation of generators with rotor-speed feedback in wind power applications

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C.P.; Migliore, P. [National Renewable Energy Lab., Golden, CO (United States)

    1996-11-01T23:59:59.000Z

    The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up, and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy the authors analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. In extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

  15. STOCHASTIC FLOW SEQUENCE GENERATION AND ASPINALL UNIT OPERATIONS

    E-Print Network [OSTI]

    to incorporate paleo #12;iv reconstructed data. The selected methods are then employed to generate syntheticSTOCHASTIC FLOW SEQUENCE GENERATION AND ASPINALL UNIT OPERATIONS By KENNETH C NOWAK B Flow Sequence Generation and Aspinall Unit Operations written by Kenneth C Nowak has been approved

  16. Autonomy and operator-assistance technologies optimize mining processes and mining equipment operation.

    E-Print Network [OSTI]

    Gupta, Abhinav

    operation. · Drills, miners and shearers are guided with laser precision for maximum extraction from the ore#12;· Autonomy and operator-assistance technologies optimize mining processes and mining equipment

  17. Sandia National Laboratories: optimal solar asset operations...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    operations and maintenance Sandia-Electric Power Research Institute Partnership Publishes Photovoltaic Reliability Report On January 21, 2014, in Energy, Facilities, Grid...

  18. Optimizing the Day to Day Operation of Utility Systems

    E-Print Network [OSTI]

    Eastwood, A.; Bealing, C.

    applications of this utility system software were set up for planning purposes, largely off-line. More recently, these applications have become more sophisticated and can operate on-line in real time. They include complex optimization routines to ensure...

  19. Requirements for Emergency Generator Operation All Emergency Generators

    E-Print Network [OSTI]

    Lawson, Catherine L.

    .2% Sulfur or less) As of October 1, 2007 Ultra low Sulfur Diesel must be used (0.05% Sulfur or less be received from manufacturer and sent to REHS Diesel emergency Generators must use low Sulfur Diesel ( 0

  20. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    purchase abs. cooling offset electric supply (kW) hourTariffs electric supply (kW) abs. cooling offset purchasecooling offset Distributed Generation Dispatch Optimization Under Various Electricity Tariffs electric supply (

  1. Optimizing Marshalling by Run-Time Program Generation

    E-Print Network [OSTI]

    Kamin, Sam

    Optimizing Marshalling by Run-Time Program Generation Bari¸s Aktemur1 , Joel Jones2 , Samuel Kamin1. Saving the internal data of an application in an external form is called marshalling. A generic marshaller is difficult to optimize because the format of the data that will be marshalled is unknown

  2. System Operation 1 Introduction to System Operation, Optimization, and Control

    E-Print Network [OSTI]

    McCalley, James D.

    not be confused with regional transmission organizations (RTOs) indicated in Fig. 0.c (and are generally also disaggregation." The motivation for doing so was to create conditions conducive for competition within this very well. In #12;System Operation 5 bringing marketplace competition to the industry, it was necessary

  3. How to use Big Data technologies to optimize operations in Upstream Petroleum Industry

    E-Print Network [OSTI]

    Boyer, Edmond

    How to use Big Data technologies to optimize operations in Upstream Petroleum Industry Abdelkader for it to have value. But what about Big Data generated by the Petroleum Industry and particularly its upstream; Analytics; Upstream Petroleum Industry; Knowledge Management; KM; Business Intelligence; BI; Innovation

  4. How to use Big Data technologies to optimize operations in Upstream Petroleum Industry

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    How to use Big Data technologies to optimize operations in Upstream Petroleum Industry Abdelkader generated by the Petroleum Industry and particularly its upstream segment? Upstream is no stranger to Big the desired outcomes? Keywords Big Data; Analytics; Upstream Petroleum Industry; Knowledge Management; KM

  5. A Methodology for Optimizing Boiler Operating Strategy

    E-Print Network [OSTI]

    Jones, K. C.

    1983-01-01T23:59:59.000Z

    Among the many ways by which an energy manager can conserve energy is the establishment of a strategy for operation of fired boilers. In particular, he can effect total fuel consumption by his decision on how much on-line boiler surplus is required...

  6. AVESTAR Center for Operational Excellence of Electricity Generation Plants

    SciTech Connect (OSTI)

    Zitney, Stephen

    2012-08-29T23:59:59.000Z

    To address industry challenges in attaining operational excellence for electricity generation plants, the U.S. Department of Energy’s (DOE) National Energy Technology Laboratory (NETL) has launched a world-class facility for Advanced Virtual Energy Simulation Training and Research (AVESTARTM). This presentation will highlight the AVESTARTM Center simulators, facilities, and comprehensive training, education, and research programs focused on the operation and control of high-efficiency, near-zero-emission electricity generation plants. The AVESTAR Center brings together state-of-the-art, real-time, high-fidelity dynamic simulators with full-scope operator training systems (OTSs) and 3D virtual immersive training systems (ITSs) into an integrated energy plant and control room environment. AVESTAR’s initial offering combines--for the first time--a “gasification with CO2 capture” process simulator with a “combined-cycle” power simulator together in a single OTS/ITS solution for an integrated gasification combined cycle (IGCC) power plant with carbon dioxide (CO2) capture. IGCC systems are an attractive technology option for power generation, especially when capturing and storing CO2 is necessary to satisfy emission targets. The AVESTAR training program offers a variety of courses that merge classroom learning, simulator-based OTS learning in a control-room operations environment, and immersive learning in the interactive 3D virtual plant environment or ITS. All of the courses introduce trainees to base-load plant operation, control, startups, and shutdowns. Advanced courses require participants to become familiar with coordinated control, fuel switching, power-demand load shedding, and load following, as well as to problem solve equipment and process malfunctions. Designed to ensure work force development, training is offered for control room and plant field operators, as well as engineers and managers. Such comprehensive simulator-based instruction allows for realistic training without compromising worker, equipment, and environmental safety. It also better prepares operators and engineers to manage the plant closer to economic constraints while minimizing or avoiding the impact of any potentially harmful, wasteful, or inefficient events. The AVESTAR Center is also used to augment graduate and undergraduate engineering education in the areas of process simulation, dynamics, control, and safety. Students and researchers gain hands-on simulator-based training experience and learn how the commercial-scale power plants respond dynamically to changes in manipulated inputs, such as coal feed flow rate and power demand. Students also analyze how the regulatory control system impacts power plant performance and stability. In addition, students practice start-up, shutdown, and malfunction scenarios. The 3D virtual ITSs are used for plant familiarization, walk-through, equipment animations, and safety scenarios. To further leverage the AVESTAR facilities and simulators, NETL and its university partners are pursuing an innovative and collaborative R&D program. In the area of process control, AVESTAR researchers are developing enhanced strategies for regulatory control and coordinated plant-wide control, including gasifier and gas turbine lead, as well as advanced process control using model predictive control (MPC) techniques. Other AVESTAR R&D focus areas include high-fidelity equipment modeling using partial differential equations, dynamic reduced order modeling, optimal sensor placement, 3D virtual plant simulation, and modern grid. NETL and its partners plan to continue building the AVESTAR portfolio of dynamic simulators, immersive training systems, and advanced research capabilities to satisfy industry’s growing need for training and experience with the operation and control of clean energy plants. Future dynamic simulators under development include natural gas combined cycle (NGCC) and supercritical pulverized coal (SCPC) plants with post-combustion CO2 capture. These dynamic simulators are targeted for us

  7. Safe Operation of Backup Power Generators

    E-Print Network [OSTI]

    Smith, David

    2006-04-19T23:59:59.000Z

    three-prong plug equipped with a grounding pin. ? Never plug the generator into a wall outlet in a house or other circuit. This practice, known as ?back feeding,? is extremely dangerous because it energizes the failed electrical wiring supply- ing...

  8. Generating Code for High-Level Operations through Code Composition

    E-Print Network [OSTI]

    Generating Code for High-Level Operations through Code Composition James M. Stichnoth August 1997 of the authors and should not be interpreted as necessarily representing the official policies or endorsements: Compilers, code generation, parallelism, communication generation #12;Abstract A traditional compiler

  9. Optimal operation of simple vapour compression cycles

    E-Print Network [OSTI]

    Skogestad, Sigurd

    is the air-conditioner (A/C). In colder regions a cycle operating in the opposite direction, the "heat pump. The coefficients of performance for a heating cycle (heat pump) and a cooling cycle (refrigerator, A/C) are defined as COPh = Qh Ws = h1 - h2 h1 - h4 and COPc = Qc Ws = h4 - h3 h1 - h4 (1.1) respectively. Heat pumps

  10. Wind turbine generator with improved operating subassemblies

    DOE Patents [OSTI]

    Cheney, Jr., Marvin C. (24 Stonepost Rd., Glastonbury, CT 06033)

    1985-01-01T23:59:59.000Z

    A wind turbine includes a yaw spring return assembly to return the nacelle from a position to which it has been rotated by yawing forces, thus preventing excessive twisting of the power cables and control cables. It also includes negative coning restrainers to limit the bending of the flexible arms of the rotor towards the tower, and stop means on the rotor shaft to orient the blades in a vertical position during periods when the unit is upwind when the wind commences. A pendulum pitch control mechanism is improved by orienting the pivot axis for the pendulum arm at an angle to the longitudinal axis of its support arm, and excessive creep is of the synthetic resin flexible beam support for the blades is prevented by a restraining cable which limits the extent of pivoting of the pendulum during normal operation but which will permit further pivoting under abnormal conditions to cause the rotor to stall.

  11. Steam generator operating experience update, 1982-1983. [PWR

    SciTech Connect (OSTI)

    Frank, L.

    1984-06-01T23:59:59.000Z

    This report is a continuation of earlier reports by the staff addressing pressurized water reactor steam generator operating experience. NUREG-0886, Steam Generator Tube Experience, published in February 1982 summarized experience in domestic and foreign plants through December 1981. This report summarizes steam generator operating experience in domestic plants for the years 1982 and 1983. Included are new problems encountered with secondary-side loose parts, sulfur-induced stress-assisted corrosion cracking, and flow-induced vibrational wear in the new preheater design steam generators. The status of Unresolved Safety Issues A3, A4, and A5 is also discussed.

  12. 1M. Panahi, S. Skogestad ' Optimal Operation of a CO2 Capturing Plant for a Wide Range of Disturbances' Optimal Operation of a CO2 Capturing

    E-Print Network [OSTI]

    Skogestad, Sigurd

    1M. Panahi, S. Skogestad ' Optimal Operation of a CO2 Capturing Plant for a Wide Range of Disturbances' Optimal Operation of a CO2 Capturing Plant for a Wide Range of Disturbances Mehdi Panahi Sigurd Skogestad 18.10.2011 AIChE Annual Meeting #12;2M. Panahi, S. Skogestad ' Optimal Operation of a CO2

  13. Data reconciliation and optimal operation of a catalytic naphtha reformer

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Data reconciliation and optimal operation of a catalytic naphtha reformer Tore Lid Statoil Mongstad-mail:skoge@chemeng.ntnu.no) #12;Abstract The naphtha reforming process converts low-octane gasoline blending compo- nents to high-octane components for use in high-performance gasoline fuels. The reformer also has a important function

  14. Data reconciliation and optimal operation of a catalytic naphtha reformer

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Data reconciliation and optimal operation of a catalytic naphtha reformer Tore Lid Statoil Mongstad-mail:skoge@chemeng.ntnu.no) #12;Abstract The naphtha reforming process converts low-octane gasoline blending compo- nents to high-octane components for use in high-performance gasoline fuels. The reformer also has an important function

  15. Operation and Configuration of a Storage Portfolio via Convex Optimization

    E-Print Network [OSTI]

    is equally broad, and includes pumped hydro, compressed air energy storage (CAES), battery energy storage sys type and size of battery is sub- sequently picked as the (single device) storage portfolio. HoweverOperation and Configuration of a Storage Portfolio via Convex Optimization Matt Kraning, Yang Wang

  16. Control and optimal operation of simple heat pump cycles

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Control and optimal operation of simple heat pump cycles Jørgen Bauck Jensen and Sigurd Skogestad in the opposite direction, the "heat pump", has recently become pop- ular. These two applications have also merged. The coefficients of performance for a heating cycle (heat pump) and a cooling cycle (refrigerator, A/C) are defined

  17. Optimal operation of a mixed fluid cascade LNG process

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Optimal operation of a mixed fluid cascade LNG process Jørgen Bauck Jensen & Sigurd Skogestad distances is to first produce liquefied natural gas (LNG) and then transport the LNG by ships. At atmospheric pressure LNG has approximately 600 times the density of gaseous NG and a temperature of ap

  18. Global Optimization for Scheduling Refinery Crude Oil Operations Ramkumar Karuppiaha

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    Global Optimization for Scheduling Refinery Crude Oil Operations Ramkumar Karuppiaha , Kevin C at the front-end of a petroleum refinery. The model relies on a continuous time representation making use-412-268-7139. Email address: grossmann@cmu.edu (I.E. Grossmann) #12;2 Keywords: Refinery scheduling; Nonconvex MINLP

  19. Positive-operator-valued measure optimization of classical correlations

    SciTech Connect (OSTI)

    Hamieh, S.; Kobes, R.; Zaraket, H. [Kernfysisch Versneller Instituut, Zernikelaan 25 9747 AA Groningen (Netherlands); Physics Department, The University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba, R3B 2E9 (Canada)

    2004-11-01T23:59:59.000Z

    We study the problem of optimization over positive-operator-valued measures to extract classical correlation in a bipartite quantum system. The proposed method is applied to binary states only. Moreover, to illustrate this method, an explicit example is studied in detail.

  20. Steam generator operating experience, update for 1989--1990

    SciTech Connect (OSTI)

    Frank, L.

    1991-12-01T23:59:59.000Z

    This report summarizes operational events and degradation mechanisms affecting pressurized water reactor steam generator integrity. It provides: results of 1989 and 1990 steam generator inspections; highlights prevalent problem areas; improvements that have been made in nondestructive testing methods; preventive measures; repair techniques; and replacement procedures. It describes the equipment of the three (3) major suppliers and discusses recent examinations of 76 plants. Major areas of concern are the steam generator degradation mechanisms that affect tube integrity or cause tube leakage and tube failure. These include; (1) intergranular attack (IGA); (2) intergranular stress corrosion cracking (IGSCC); (3) primary water stress corrosion cracking (PWSCC); (4) pitting; and (5) vibrational wear and fatigue. Also discussed are plugging, sleeving, heat treatment, peening, chemical cleaning, and steam generator replacements. The current status of regulatory instruments and inspection guidelines for ensuring the steam generator integrity, is discussed with the highlights of steam generator research. New potential safety issues such as circumferential cracking and tube plug cracking are also discussed.

  1. Distributed Generation Dispatch Optimization under VariousElectricity Tariffs

    SciTech Connect (OSTI)

    Firestone, Ryan; Marnay, Chris

    2007-05-01T23:59:59.000Z

    The on-site generation of electricity can offer buildingowners and occupiers financial benefits as well as social benefits suchas reduced grid congestion, improved energy efficiency, and reducedgreenhouse gas emissions. Combined heat and power (CHP), or cogeneration,systems make use of the waste heat from the generator for site heatingneeds. Real-time optimal dispatch of CHP systems is difficult todetermine because of complicated electricity tariffs and uncertainty inCHP equipment availability, energy prices, and system loads. Typically,CHP systems use simple heuristic control strategies. This paper describesa method of determining optimal control in real-time and applies it to alight industrial site in San Diego, California, to examine: 1) the addedbenefit of optimal over heuristic controls, 2) the price elasticity ofthe system, and 3) the site-attributable greenhouse gas emissions, allunder three different tariff structures. Results suggest that heuristiccontrols are adequate under the current tariff structure and relativelyhigh electricity prices, capturing 97 percent of the value of thedistributed generation system. Even more value could be captured bysimply not running the CHP system during times of unusually high naturalgas prices. Under hypothetical real-time pricing of electricity,heuristic controls would capture only 70 percent of the value ofdistributed generation.

  2. Construction of optimal teleportation witness operators from entanglement witnesses

    E-Print Network [OSTI]

    Satyabrata Adhikari; Nirman Ganguly; A. S. Majumdar

    2012-09-06T23:59:59.000Z

    Teleportation witnesses are hermitian operators which can identify useful entanglement for quantum teleportation. Here we provide a systematic method to construct teleportation witnesses from entanglement witnesses corresponding to general qudit systems. The witnesses so constructed are shown to be optimal for qubit and qutrit systems, and therefore detect the largest set of states useful for teleportation within a given class. We demonstrate the action of the witness pertaining to different classes of states in qubits and qutrits. Decomposition of the witness in terms of spin operators facilitiates experimental identification of useful resources for teleportation.

  3. Cold weather hydrogen generation system and method of operation

    DOE Patents [OSTI]

    Dreier, Ken Wayne (Madison, CT); Kowalski, Michael Thomas (Seymour, CT); Porter, Stephen Charles (Burlington, CT); Chow, Oscar Ken (Simsbury, CT); Borland, Nicholas Paul (Montpelier, VT); Goyette, Stephen Arthur (New Hartford, CT)

    2010-12-14T23:59:59.000Z

    A system for providing hydrogen gas is provided. The system includes a hydrogen generator that produces gas from water. One or more heat generation devices are arranged to provide heating of the enclosure during different modes of operation to prevent freezing of components. A plurality of temperature sensors are arranged and coupled to a controller to selectively activate a heat source if the temperature of the component is less than a predetermined temperature.

  4. Near-optimal operation by self-optimizing control: From process con-trol to marathon running and business systems

    E-Print Network [OSTI]

    Skogestad, Sigurd

    range of systems. The idea of self-optimizing control is explained in more detail in the next sectionNear-optimal operation by self-optimizing control: From process con- trol to marathon running to implement optimal decisions in an uncertain world. A study of how this is done in real systems - from

  5. Decision-Support Software for Grid Operators: Transmission Topology Control for Infrastructure Resilience to the Integration of Renewable Generation

    SciTech Connect (OSTI)

    None

    2012-03-16T23:59:59.000Z

    GENI Project: The CRA team is developing control technology to help grid operators more actively manage power flows and integrate renewables by optimally turning on and off entire power lines in coordination with traditional control of generation and load resources. The control technology being developed would provide grid operators with tools to help manage transmission congestion by identifying the facilities whose on/off status must change to lower generation costs, increase utilization of renewable resources and improve system reliability. The technology is based on fast optimization algorithms for the near to real-time change in the on/off status of transmission facilities and their software implementation.

  6. Simulation and Optimization on Power Plant Operation Using SEGA's EOP Program

    E-Print Network [OSTI]

    Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.

    The operation of a cogeneration power plant is complicated. The Energy Optimization Program (EOP, software made by SEGA, Inc.) was designed to simulate and optimize the operation of TAMU power plant. All major plant components were represented...

  7. Simulation and Optimization on Power Plant Operation Using Sega's EOP Program 

    E-Print Network [OSTI]

    Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.

    2000-01-01T23:59:59.000Z

    The operation of a cogeneration power plant is complicated. The Energy Optimization Program (EOP, software made by SEGA, Inc.) was designed to simulate and optimize the operation of TAMU power plant. All major plant components were represented...

  8. Simulation and Optimization on Power Plant Operation Using Sega's EOP Program

    E-Print Network [OSTI]

    Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.

    2000-01-01T23:59:59.000Z

    The operation of a cogeneration power plant is complicated. The Energy Optimization Program (EOP, software made by SEGA, Inc.) was designed to simulate and optimize the operation of TAMU power plant. All major plant components were represented...

  9. Optimal operation and design of solar-thermal energy storage systems

    E-Print Network [OSTI]

    Lizarraga-García, Enrique

    2012-01-01T23:59:59.000Z

    The present thesis focuses on the optimal operation and design of solar-thermal energy storage systems. First, optimization of time-variable operation to maximize revenue through selling and purchasing electricity to/from ...

  10. Steam generator operating experience: Update for 1984-1986

    SciTech Connect (OSTI)

    Frank, L.; Stokley, J.

    1988-06-01T23:59:59.000Z

    This report summarizes operational events and degradation mechanisms affecting pressurized water reactor steam generator integrity, provides updated inspection results reported in 1984, 1985, and 1986, and highlights both prevalent problem areas and advances in improved equipment test practices, preventive measures, repair techniques, and replacement procedures. It describes equipment design features of the three major suppliers and discusses 68 plants in detail. Steam generator degradation mechanisms include intergranular stress corrosion cracking, primary water stress corrosion cracking, pitting, intergranular attack, and vibration wear that effects tube integrity and causes leakage. Plugging, sleeving heat treatment, peening, chemical cleaning, and steam generator replacements are described and regulatory instruments and inspection guidelines for nondestructive evaluations and girth weld cracking are discusses. The report concludes that although degradation mechanisms are generally understood, the elimination of unscheduled plant shutdowns and costly repairs resulting from leaking tubes has not been achieved. Highlights of steam generator research and unresolved safety issues are discussed. 21 refs., 8 tabs.

  11. Engine optimal operation lines for power-split hybrid electric vehicles

    E-Print Network [OSTI]

    Papalambros, Panos

    . Keywords: hybrid electric vehicle, power split, energy management strategy, optimal operation lineEngine optimal operation lines for power-split hybrid electric vehicles Kukhyun Ahn* and P Y of degrees of freedom in energy management. Optimization problems for the two operation modes are formulated

  12. Power Generation Loading Optimization using a Multi-Objective Constraint-Handling Method via

    E-Print Network [OSTI]

    Li, Xiaodong

    power industry. A major objective for the coal-fired power generation loading optimization results of the power generation loading optimization based on a coal-fired power plant demonstratesPower Generation Loading Optimization using a Multi-Objective Constraint-Handling Method via PSO

  13. Engineering to Control Noise, Loading, and Optimal Operating Points

    SciTech Connect (OSTI)

    Mitchell R. Swartz

    2000-11-12T23:59:59.000Z

    Successful engineering of low-energy nuclear systems requires control of noise, loading, and optimum operating point (OOP) manifolds. The latter result from the biphasic system response of low-energy nuclear reaction (LENR)/cold fusion systems, and their ash production rate, to input electrical power. Knowledge of the optimal operating point manifold can improve the reproducibility and efficacy of these systems in several ways. Improved control of noise, loading, and peak production rates is available through the study, and use, of OOP manifolds. Engineering of systems toward the OOP-manifold drive-point peak may, with inclusion of geometric factors, permit more accurate uniform determinations of the calibrated activity of these materials/systems.

  14. Abstract--A bi-objective optimization model of power and power changes generated by a wind turbine is discussed in this

    E-Print Network [OSTI]

    Kusiak, Andrew

    operating a variable-speed wind turbine with pitch control to maximize power while minimizing the loads prediction, power ramp rate, data mining, wind turbine operation strategy, generator torque, blade pitch1 Abstract--A bi-objective optimization model of power and power changes generated by a wind

  15. Steam generator operating experience, update for 1987--1988

    SciTech Connect (OSTI)

    Frank, L.; Stokley, J.

    1989-06-01T23:59:59.000Z

    This report summarizes operational events and degradation mechanisms affecting pressurized water reactor steam generator integrity, provides results of 1987 and 1988 steam generator inspections, and highlights both prevalent problem areas and improvements that have been made in nondestructive testing methods, preventive measures, repair techniques, and replacement procedures. It describes the equipment of the three major suppliers and discusses recent examinations of 76 plants. Major areas of concern are the steam generator degradation mechanisms that affect tube integrity or cause tube leakage and tube failure. These include intergranular attack (IGA), intergranular stress corrosion cracking (IGSCC), primary water stress corrosion cracking (PWSCC), pitting, and vibrational wear and fatigue. Also discussed are plugging, sleeving, heat treatment, peening, chemical cleaning, and steam generator replacements, the current status of regulatory instruments and inspection guidelines for ensuring the steam generator integrity, and highlights of steam generator research and unresolved safety issues. The report concludes that cracking, both IGSCC on the tube outside diameter and PWSCC on the tube inside diameter, was the major cause of tube degradation during the 1987--1988 period. 24 refs., 8 tabs.

  16. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    Optimization Under Various Electricity Tariffs Firestone,Optimization Under Various Electricity Tariffs Table of3 2.1 Electricity Tariff

  17. Optimal Solar PV Arrays Integration for Distributed Generation

    SciTech Connect (OSTI)

    Omitaomu, Olufemi A [ORNL; Li, Xueping [University of Tennessee, Knoxville (UTK)

    2012-01-01T23:59:59.000Z

    Solar photovoltaic (PV) systems hold great potential for distributed energy generation by installing PV panels on rooftops of residential and commercial buildings. Yet challenges arise along with the variability and non-dispatchability of the PV systems that affect the stability of the grid and the economics of the PV system. This paper investigates the integration of PV arrays for distributed generation applications by identifying a combination of buildings that will maximize solar energy output and minimize system variability. Particularly, we propose mean-variance optimization models to choose suitable rooftops for PV integration based on Markowitz mean-variance portfolio selection model. We further introduce quantity and cardinality constraints to result in a mixed integer quadratic programming problem. Case studies based on real data are presented. An efficient frontier is obtained for sample data that allows decision makers to choose a desired solar energy generation level with a comfortable variability tolerance level. Sensitivity analysis is conducted to show the tradeoffs between solar PV energy generation potential and variability.

  18. Performing a scatterv operation on a hierarchical tree network optimized for collective operations

    DOE Patents [OSTI]

    Archer, Charles J; Blocksome, Michael A; Ratterman, Joseph D; Smith, Brian E

    2013-10-22T23:59:59.000Z

    Performing a scatterv operation on a hierarchical tree network optimized for collective operations including receiving, by the scatterv module installed on the node, from a nearest neighbor parent above the node a chunk of data having at least a portion of data for the node; maintaining, by the scatterv module installed on the node, the portion of the data for the node; determining, by the scatterv module installed on the node, whether any portions of the data are for a particular nearest neighbor child below the node or one or more other nodes below the particular nearest neighbor child; and sending, by the scatterv module installed on the node, those portions of data to the nearest neighbor child if any portions of the data are for a particular nearest neighbor child below the node or one or more other nodes below the particular nearest neighbor child.

  19. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    Optimization Common DG devices are reciprocating engines, gas turbines, microturbines, and fuel cells.

  20. Shockwave generation by a semiconductor bridge operation in water

    SciTech Connect (OSTI)

    Zvulun, E.; Toker, G.; Gurovich, V. Tz.; Krasik, Ya. E. [Physics Department, Technion, Haifa 32000 (Israel)

    2014-05-28T23:59:59.000Z

    A semiconductor bridge (SCB) is a silicon device, used in explosive systems as the electrical initiator element. In recent years, SCB plasma has been extensively studied, both electrically and using fast photography and spectroscopic imaging. However, the value of the pressure buildup at the bridge remains unknown. In this study, we operated SCB devices in water and, using shadow imaging and reference beam interferometry, obtained the velocity of the shock wave propagation and distribution of the density of water. These results, together with a self-similar hydrodynamic model, were used to calculate the pressure generated by the exploding SCB. In addition, the results obtained showed that the energy of the water flow exceeds significantly the energy deposited into the exploded SCB. The latter can be explained by the combustion of the aluminum and silicon atoms released in water, which acts as an oxidizing medium.

  1. Monitoring and Optimization of Building Operations of a Low-Energy School Building

    E-Print Network [OSTI]

    Koenigsdorff, R.; Heinrich, S.; Baumann, O.; Reiser, C.

    consumption was almost met during the second year of operation in 2006 and finally achieved in 2007, due to well-working optimization measures, which were identified through monitoring of the building operation. Heating and cooling energy is mainly provided...

  2. Control and optimal operation of simple heat pump cycles Jrgen B. Jensen and Sigurd Skogestad

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Control and optimal operation of simple heat pump cycles Jørgen B. Jensen and Sigurd Skogestad cycle. Keywords: Operation, heat pump cycle, cyclic process, charge, self-optimizing control 1. The coefficients of performance for a heating cycle (heat pump) and a cooling cycle (re- frigerator, A

  3. Implications of a Regime-Switching Model on Natural Gas Storage Valuation and Optimal Operation

    E-Print Network [OSTI]

    Forsyth, Peter A.

    Implications of a Regime-Switching Model on Natural Gas Storage Valuation and Optimal Operation-switching model for the risk adjusted natural gas spot price and study the implications of the model on the valuation and optimal operation of natural gas storage facilities. We calibrate the model parameters to both

  4. Switching Mode Generation and Optimal Estimation with Application to Skid-Steering

    E-Print Network [OSTI]

    Hartmann, Mitra J. Z.

    to treat the skid-steered vehicle as a switched system, the vehicle's ground interaction is modeled using; optimal estimation; optimal control; estimation algorithms 1 Introduction The skid-steered vehicle (SSVSwitching Mode Generation and Optimal Estimation with Application to Skid-Steering T. M. Caldwell

  5. Optimization of sequential attractor-based movement for compact behaviour generation

    E-Print Network [OSTI]

    Toussaint, Marc

    Optimization of sequential attractor-based movement for compact behaviour generation Marc Toussaint optimal robot motion based on a sequence of attractor dynamics in task space. This is motivated] ­ and by the need for compact movement representations on which efficient optimization can be performed. We

  6. Optimal and Robust Saturated Control for a Clock Generator C. Albea S. Lesecq and D. Puschini

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ,i] [7]. If the clock is generated for the whole circuit, and distributed in each VFI, the maximumOptimal and Robust Saturated Control for a Clock Generator C. Albea S. Lesecq and D. Puschini control engines in each volt- age/frequency island must be taken into account to optimize the circuit

  7. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    utility experience with RTP tariffs is described in 3. Distributed GenerationUtilities Commission, Division of Ratepayer Advocates have also provided support on related work. Distributed Generation

  8. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    the Optimization of Cogeneration Dispatch in a Deregulatedheat and power (CHP), or cogeneration, systems make use ofheat and power (CHP), or cogeneration, systems make use of

  9. Optimal Technology Selection and Operation of Microgrids inCommercial Buildings

    SciTech Connect (OSTI)

    Marnay, Chris; Venkataramanan, Giri; Stadler, Michael; Siddiqui,Afzal; Firestone, Ryan; Chandran, Bala

    2007-01-15T23:59:59.000Z

    The deployment of small (<1-2 MW) clusters of generators,heat and electrical storage, efficiency investments, and combined heatand power (CHP) applications (particularly involving heat activatedcooling) in commercial buildings promises significant benefits but posesmany technical and financial challenges, both in system choice and itsoperation; if successful, such systems may be precursors to widespreadmicrogrid deployment. The presented optimization approach to choosingsuch systems and their operating schedules uses Berkeley Lab'sDistributed Energy Resources Customer Adoption Model [DER-CAM], extendedto incorporate electrical storage options. DER-CAM chooses annual energybill minimizing systems in a fully technology-neutral manner. Anillustrative example for a San Francisco hotel is reported. The chosensystem includes two engines and an absorption chiller, providing anestimated 11 percent cost savings and 10 percent carbon emissionreductions, under idealized circumstances.

  10. Start | Grid View | Browse by Day OR Group/Topical | Author Index | Keyword Index | Personal Scheduler Optimal Operation of a CO2 Capturing Plant for a Wide Range of Disturbances

    E-Print Network [OSTI]

    Skogestad, Sigurd

    flowrate coming from the power plant) change over the expected operating window. Dynamic simulation. The stripping column uses a large fraction, about 15-30% of the net power generated in the power plant. Optimal Scheduler Optimal Operation of a CO2 Capturing Plant for a Wide Range of Disturbances Tuesday, October 18

  11. Development of Optimal Catalyst Designs and Operating Strategies...

    Broader source: Energy.gov (indexed) [DOE]

    ammonia-based SCR Phase 2 Develop first-principles LNT-SCR reactor model for optimization and real-time simulation Elucidate spatio-temporal phenomena in LNT-SCR systems...

  12. Optimization for Design and Operation of Natural Gas Transmission Networks

    E-Print Network [OSTI]

    Dilaveroglu, Sebnem 1986-

    2012-08-22T23:59:59.000Z

    and compressor stations. On an existing network, the model also optimizes the total flow through pipelines that satisfy demand to determine the best purchase amount of gas. A mixed integer nonlinear programming model for steady-state natural gas transmission...

  13. 1052 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 25, NO. 2, MAY 2010 Co-Optimization of Generation Unit Commitment

    E-Print Network [OSTI]

    Oren, Shmuel S.

    into electric network optimization models. Optimal transmission switching is a straight- forward way to leverage economics, power system reliability, power transmission control, power transmission economics. NOMENCLATURE. Generator. Set of generators at node . Transmission element (line or transformer). Set of transmission

  14. Development of Optimal Catalyst Designs and Operating Strategies...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    engine generator testing system for different diesel fuels, fuel blends, fuel additives, and evaluate their efficiency in Nox reduction. p-06harold.pdf More Documents &...

  15. A Three-Operator Splitting Scheme and its Optimization Applications

    E-Print Network [OSTI]

    Damek Davis

    2015-03-04T23:59:59.000Z

    Mar 4, 2015 ... Abstract: Operator splitting schemes have been successfully used in computational sciences to reduce complex problems into a series of ...

  16. A Systems Approach to Optimize the Operation of a Refrigeration Unit at a Chemical Plant 

    E-Print Network [OSTI]

    Papar, R.; Zugibe, K.; Heitler, J.

    2005-01-01T23:59:59.000Z

    This paper focuses on the ongoing system level analysis and the optimization results of two steamturbine driven refrigeration units at the Dow Chemical company Peroxymerics (PXC) plant located at St. Charles Operations in Hahnville, LA. Six-sigma...

  17. Airline schedule planning and operations : optimization-based approaches for delay mitigation

    E-Print Network [OSTI]

    Marla, Lavanya

    2010-01-01T23:59:59.000Z

    We study strategic and operational measures of improving airline system performance and reducing delays for aircraft, crew and passengers. As a strategic approach, we study robust optimization models, which capture possible ...

  18. Intelligent Building Energy Information and Control Systems for Low-Energy Operations and Optimal Demand Response

    E-Print Network [OSTI]

    Piette, Mary Ann

    2014-01-01T23:59:59.000Z

    Systems for  Energy Management and Demand Response in 7.  Linking energy efficiency and demand response.   In for Low-Energy Operations and Optimal Demand Response Mary

  19. Evaluation of Storage Reallocation and Related Strategies for Optimizing Reservoir System Operations

    E-Print Network [OSTI]

    Wurbs, Ralph A.; Carriere, Patrick E.

    TR-145 1988 Evaluation of Storage Reallocation and Related Strategies for Optimizing Reservoir System Operations R.A. Wurbs P.E. Carriere Texas Water Resources Institute Texas A&M University ...

  20. A Systems Approach to Optimize the Operation of a Refrigeration Unit at a Chemical Plant

    E-Print Network [OSTI]

    Papar, R.; Zugibe, K.; Heitler, J.

    2005-01-01T23:59:59.000Z

    This paper focuses on the ongoing system level analysis and the optimization results of two steamturbine driven refrigeration units at the Dow Chemical company Peroxymerics (PXC) plant located at St. Charles Operations in Hahnville, LA. Six...

  1. Stochastic Optimization for Operating Chemical Processes under Uncertainty

    E-Print Network [OSTI]

    Henrion, René

    units like reactors, distillation columns, heat exchangers and so on. Based on mar- ket demands, those. The column is operated at atmospheric pressure. From the design, the diameter of the column, the number distillation column with a feed tank operation, e.g., tray efficiencies and fouling of the equipment, which

  2. Optimizing Cooling Manual of Operations June 30, 2010

    E-Print Network [OSTI]

    Rau, Don C.

    and at other university medical centers across the United States through the National Institute of Child Health available to infants with moderate to severe HIE, protecting their brains therefore reducing the rate of death and improving outcomes at 18 months of age This study of Optimizing Cooling will be examining

  3. Optimal strategies for operating energy storage in an arbitrage Lisa Flatley

    E-Print Network [OSTI]

    Sengun, Mehmet Haluk

    Optimal strategies for operating energy storage in an arbitrage market Lisa Flatley Robert S Mac, energy storage, optimal localized algorithm. AMS subject classifications. 49K30, 93C10 1 Introduction [0, T], for an energy store which is trading in an arbitrage market. Our theory allows for leakage

  4. Use of Short-cut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Use of Short-cut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns Ivar J: Petlyuk distillation column, dividing wall column, optimizing control, minimum energy 1. INTRODUCTION- ments for the level of automatic control and to the design of number of stages in each column section. 2

  5. Use of Shortcut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Use of Short­cut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns Ivar J: Petlyuk distillation column, dividing wall column, optimizing control, minimum energy 1. INTRODUCTION­ ments for the level of automatic control and to the design of number of stages in each column section. 2

  6. Optimization Online - PSMG-A Parallel Structured Model Generator ...

    E-Print Network [OSTI]

    Feng Qiang

    2014-10-10T23:59:59.000Z

    Oct 10, 2014 ... As far as we are aware, PSMG is the first processor for an algebraic modelling language that is capable of generating the problem in parallel.

  7. Stochastic Programming and its Application to Optimal Generation Planning Stochastic Programming and its

    E-Print Network [OSTI]

    McCalley, James D.

    to Optimal Generation Planning 4 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Xraw1 Xraw

  8. Design, integration schemes, and optimization of conventional and pressurized oxy-coal power generation processes

    E-Print Network [OSTI]

    Zebian, Hussam

    2014-01-01T23:59:59.000Z

    Efficient and clean electricity generation is a major challenge for today's world. Multivariable optimization is shown to be essential in unveiling the true potential and the high efficiency of pressurized oxy-coal combustion ...

  9. Optimal Control for Generating Quantum Gates in Open Dissipative Systems

    E-Print Network [OSTI]

    T. Schulte-Herbrueggen; A. Spoerl; N. Khaneja; S. J. Glaser

    2009-05-17T23:59:59.000Z

    Optimal control methods for implementing quantum modules with least amount of relaxative loss are devised to give best approximations to unitary gates under relaxation. The potential gain by optimal control using relaxation parameters against time-optimal control is explored and exemplified in numerical and in algebraic terms: it is the method of choice to govern quantum systems within subspaces of weak relaxation whenever the drift Hamiltonian would otherwise drive the system through fast decaying modes. In a standard model system generalising decoherence-free subspaces to more realistic scenarios, openGRAPE-derived controls realise a CNOT with fidelities beyond 95% instead of at most 15% for a standard Trotter expansion. As additional benefit it requires control fields orders of magnitude lower than the bang-bang decouplings in the latter.

  10. Optimal design and operation of energy polygeneration systems

    E-Print Network [OSTI]

    Chen, Yang, Ph. D. Massachusetts Institute of Technology. Department of Chemical Engineering

    2013-01-01T23:59:59.000Z

    Polygeneration is a concept where multiple energy products are generated in a single plant by tightly integrating multiple processes into one system. Compared to conventional single-product systems, polygeneration systems ...

  11. Optimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    : Multiobjective Optimization, Genetic Algorithms, Wind Energy, Vertical Axis Wind Turbine hal-00763673,version1 #12;2.2. The Wind Turbine Characteristics A Savonius Vertical Axis Wind Turbine of radius R = 0.5 mOptimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms A

  12. Stresa, Italy, 26-28 April 2006 OPTIMIZATION OF PIEZOELECTRIC ELECTRICAL GENERATORS

    E-Print Network [OSTI]

    Boyer, Edmond

    Stresa, Italy, 26-28 April 2006 OPTIMIZATION OF PIEZOELECTRIC ELECTRICAL GENERATORS POWERED the PEG output power [2,3]. Although the power electronic interface used for optimization induces Villeurbanne Cedex, France ABSTRACT This paper compares the performances of a vibration- powered electrical

  13. Optimization for Design and Operation of Natural Gas Transmission Networks 

    E-Print Network [OSTI]

    Dilaveroglu, Sebnem 1986-

    2012-08-22T23:59:59.000Z

    designing and operating the network. A well-designed network helps natural gas companies minimize the costs while increasing the customer service level. The aim of the study is to determine the optimum installation scheduling and locations of new pipelines...

  14. Data-driven optimization and analytics for operations management applications

    E-Print Network [OSTI]

    Uichanco, Joline Ann Villaranda

    2013-01-01T23:59:59.000Z

    In this thesis, we study data-driven decision making in operation management contexts, with a focus on both theoretical and practical aspects. The first part of the thesis analyzes the well-known newsvendor model but under ...

  15. OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS,

    E-Print Network [OSTI]

    Frank, Jason

    of novel components for decentral power generation (solar panels, small wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, small wind turbine or central-producers. Decentralized Power Generation (DPG) refers to an electric power source such as solar, wind or combined heat

  16. Scanning the Issue Special Issue on Program Generation, Optimization, and

    E-Print Network [OSTI]

    Dongarra, Jack

    the development of high-performance libraries and applications for engineers and scientists. The fast evolution an intense and sustained ef- fort--which can stretch over a period of weeks or months, if not years, development, and optimization of high-performance software libraries and applications. The special issue

  17. AVESTAR Center for operational excellence of electricity generation plants

    SciTech Connect (OSTI)

    Zitney, S.

    2012-01-01T23:59:59.000Z

    To address challenges in attaining operational excellence for clean energy plants, the U.S.Department of Energy’s National Energy Technology Laboratory has launched a world-class facility for Advanced Virtual Energy Simulation Training and Research (AVESTAR™). The AVESTAR Center brings together state-of-the-art, real time,high-fidelity dynamic simulators with operator training systems and 3D virtual immersive training systems into an integrated energy plant and control room environment.

  18. Multi-Objective Optimization of Folsom Reservoir Operation RANDI CAMERON FIELD

    E-Print Network [OSTI]

    Lund, Jay R.

    , hydropower and downstream temperature control are desired. In the summer and early fall fishery habitat impose a cost to hydropower generation if colder temperature water bypasses the hydropower tur- bines, and maximize hydropower generation. In this appli- cation, optimal seasonal reservoir release decisions

  19. System and method of cylinder deactivation for optimal engine torque-speed map operation

    DOE Patents [OSTI]

    Sujan, Vivek A; Frazier, Timothy R; Follen, Kenneth; Moon, Suk-Min

    2014-11-11T23:59:59.000Z

    This disclosure provides a system and method for determining cylinder deactivation in a vehicle engine to optimize fuel consumption while providing the desired or demanded power. In one aspect, data indicative of terrain variation is utilized in determining a vehicle target operating state. An optimal active cylinder distribution and corresponding fueling is determined from a recommendation from a supervisory agent monitoring the operating state of the vehicle of a subset of the total number of cylinders, and a determination as to which number of cylinders provides the optimal fuel consumption. Once the optimal cylinder number is determined, a transmission gear shift recommendation is provided in view of the determined active cylinder distribution and target operating state.

  20. Dynamic Phasor Modeling of the Doubly-Fed Induction Machine in Generator Operation Emmanuel Delaleau*

    E-Print Network [OSTI]

    Stankoviæ, Aleksandar

    Dynamic Phasor Modeling of the Doubly-Fed Induction Machine in Generator Operation Emmanuel at variable speed; second, the excitation power electronics converter feeding the rotor windings needs of the doubly- fed induction machine in generator operation using dynamic phasors. This concept is coming from

  1. SUSTAINABLE RESERVOIR OPERATION: CAN WE GENERATE HYDROPOWER AND PRESERVE ECOSYSTEM VALUES?y

    E-Print Network [OSTI]

    Jager, Henriette I.

    SUSTAINABLE RESERVOIR OPERATION: CAN WE GENERATE HYDROPOWER AND PRESERVE ECOSYSTEM VALUES hydropower are typically operated with the goal of maximizing energy revenue, while meeting other legal water approaches. The first approach seeks flow regimes that maximize hydropower generation, while satisfying legal

  2. Optimal command generation for maneuvering the space station

    E-Print Network [OSTI]

    Bryson, Amy Louise

    2001-01-01T23:59:59.000Z

    The objective of this research is to obtain near minimum-fuel and minimum-time maneuver commands for large-angle maneuvers for the international space station. Attitude and angular velocity waypoints are generated using the method of differential...

  3. Optimization Online - Simultaneous Column-and-Row Generation ...

    E-Print Network [OSTI]

    Ibrahim Muter

    2010-11-14T23:59:59.000Z

    Nov 14, 2010 ... Abstract: In this paper, we develop a simultaneous column-and-row generation algorithm that could be applied to a general class of large-scale ...

  4. Optimizing Blast Furnace Operation to Increase Efficiency and Lower Costs

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment ofOil'sEnergy8 * October 2006Optimizing Blast

  5. Optimizing Blast Furnace Operation to Increase Efficiency and Lower Costs |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment ofOil'sEnergy8 * October 2006Optimizing

  6. Sensitivity Analysis of Optimal Operation of an Activated Sludge Process Model for Economic Controlled Variable Selection

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Sensitivity Analysis of Optimal Operation of an Activated Sludge Process Model for Economic operation conducted on an activated sludge process model based on the test-bed benchmark simulation model no. 1 (BSM1) and the activated sludge model no. 1 (ASM1). The objective is to search for a control

  7. Computers and Chemical Engineering 31 (2007) 15901601 Optimal operation of simple refrigeration cycles

    E-Print Network [OSTI]

    Skogestad, Sigurd

    2007-01-01T23:59:59.000Z

    Computers and Chemical Engineering 31 (2007) 1590­1601 Optimal operation of simple refrigeration February 2007 Abstract The paper focuses on operation of simple refrigeration cycles and considers refrigeration cycle and the other is a trans-critical CO2 refrigeration cycle. There is no fundamental

  8. Computers and Chemical Engineering 31 (2007) 712721 Optimal operation of simple refrigeration cycles

    E-Print Network [OSTI]

    Skogestad, Sigurd

    2007-01-01T23:59:59.000Z

    Computers and Chemical Engineering 31 (2007) 712­721 Optimal operation of simple refrigeration online 16 January 2007 Abstract The paper focuses on the operation of simple refrigeration cycles of about 2%. In this paper, refrigeration (cooling) cycles are considered, but the same principles apply

  9. Single-cycle mixed-fluid LNG process Part II: Optimal operation

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Single-cycle mixed-fluid LNG process Part II: Optimal operation Jørgen Bauck Jensen and Sigurd of work that goes into the design of LNG processes, there is surprisingly little attention simple LNG process, namely the PRICO process. Keywords: PRICO, LNG, operation 1 Introduction The process

  10. Optimal monitoring and visualization of steady state power system operation 

    E-Print Network [OSTI]

    Xu, Bei

    2009-06-02T23:59:59.000Z

    3. Matrix conditioning . . . . . . . . . . . . . . . . . . . 22 E. Simulation Results . . . . . . . . . . . . . . . . . . . . . . 22 1. IEEE 14-bus system . . . . . . . . . . . . . . . . . . . 23 a. Case 1: State estimation without measure- ment... errors . . . . . . . . . . . . . . . . . . . . . 25 b. Case 2: Introducing bad data . . . . . . . . . . . 25 c. Case 3: Operating the UPFC at its capacity limit 26 d. Case 4: Controller parameter determination . . . 27 2. IEEE 57-bus system...

  11. Site-Wide Optimization Using an Operations Center

    E-Print Network [OSTI]

    Boland, D.

    "Most industrial sites consist of more that one individual production unit. Whenever this is the case, there is a natural tendency to treat the operation and performance of each unit as one entity within its own right. However, it is generally...

  12. Operational Model for C3 Feedstock Optimization on a

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    Chemical and refinery grade feedstocks with different prices and propylene purities. Best operation Polypropylene production facility Chemical and refinery grade feedstocks with different prices and propyleneTank Propylene (91%) ~79% propylene ~95% propylene 3 #12;Process and Problem Description Chemical Grade (CG

  13. Optimizing operational flexibility and enforcement liability in Title V permits

    SciTech Connect (OSTI)

    McCann, G.T. [Rust Environment and Infrastructure Inc., Greenville, SC (United States)

    1997-12-31T23:59:59.000Z

    Now that most states have interim or full approval of the portions of their state implementation plans (SIPs) implementing Title V (40 CFR Part 70) of the Clean Air Act Amendments (CAAA), most sources which require a Title V permit have submitted or are well on the way to submitting a Title V operating permit application. Numerous hours have been spent preparing applications to ensure the administrative completeness of the application and operational flexibility for the facility. Although much time and effort has been spent on Title V permit applications, the operating permit itself is the final goal. This paper outlines the major Federal requirements for Title V permits as given in the CAAA at 40 CFR 70.6, Permit Content. These Federal requirements and how they will effect final Title V permits and facilities will be discussed. This paper will provide information concerning the Federal requirements for Title V permits and suggestions on how to negotiate a Title V permit to maximize operational flexibility and minimize enforcement liability.

  14. Simulation and optimization of cogeneration power plant operation using an Energy Optimization Program

    E-Print Network [OSTI]

    Zhou, Jijun

    2001-01-01T23:59:59.000Z

    The operation of a combined cycle cogeneration power plant system is complicated because of the complex interactions among components as well as the dynamic nature of the system. Studies of plant operation through experiments in such a sensitive...

  15. Six-phase induction machine operating as a stand-alone self-excited induction generator

    E-Print Network [OSTI]

    Brest, Université de

    -excited induction generator and supplying various loads under different conditions are presented. Firstly generators are particularly used in small and isolated power plants based on wind turbine or hydroelectricSix-phase induction machine operating as a stand- alone self-excited induction generator Kamel

  16. Optimal transfer of an unknown state via a bipartite operation

    E-Print Network [OSTI]

    Yang Liu; Yu Guo; D. L. Zhou

    2012-09-11T23:59:59.000Z

    A fundamental task in quantum information science is to transfer an unknown state from particle $A$ to particle $B$ (often in remote space locations) by using a bipartite quantum operation $\\mathcal{E}^{AB}$. We suggest the power of $\\mathcal{E}^{AB}$ for quantum state transfer (QST) to be the maximal average probability of QST over the initial states of particle $B$ and the identifications of the state vectors between $A$ and $B$. We find the QST power of a bipartite quantum operations satisfies four desired properties between two $d$-dimensional Hilbert spaces. When $A$ and $B$ are qubits, the analytical expressions of the QST power is given. In particular, we obtain the exact results of the QST power for a general two-qubit unitary transformation.

  17. Integrating event detection system operation characteristics into sensor placement optimization.

    SciTech Connect (OSTI)

    Hart, William Eugene; McKenna, Sean Andrew; Phillips, Cynthia Ann; Murray, Regan Elizabeth (US Environmental Protection Agency, Cincinnati, OH); Hart, David Blaine

    2010-05-01T23:59:59.000Z

    We consider the problem of placing sensors in a municipal water network when we can choose both the location of sensors and the sensitivity and specificity of the contamination warning system. Sensor stations in a municipal water distribution network continuously send sensor output information to a centralized computing facility, and event detection systems at the control center determine when to signal an anomaly worthy of response. Although most sensor placement research has assumed perfect anomaly detection, signal analysis software has parameters that control the tradeoff between false alarms and false negatives. We describe a nonlinear sensor placement formulation, which we heuristically optimize with a linear approximation that can be solved as a mixed-integer linear program. We report the results of initial experiments on a real network and discuss tradeoffs between early detection of contamination incidents, and control of false alarms.

  18. Reservoir Stimulation Optimization with Operational Monitoring for Creation of EGS

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Fernandez, Carlos A.

    EGS field projects have not sustained production at rates greater than ½ of what is needed for economic viability. The primary limitation that makes commercial EGS infeasible is our current inability to cost-effectively create high-permeability reservoirs from impermeable, igneous rock within the 3,000-10,000 ft depth range. Our goal is to develop a novel fracturing fluid technology that maximizes reservoir permeability while reducing stimulation cost and environmental impact. Laboratory equipment development to advance laboratory characterization/monitoring is also a priority of this project to study and optimize the physicochemical properties of these fracturing fluids in a range of reservoir conditions. Barrier G is the primarily intended GTO barrier to be addressed as well as support addressing barriers D, E and I.

  19. Optimization of infrared two-color multicycle field synthesis for intense-isolated-attosecond-pulse generation

    SciTech Connect (OSTI)

    Lan Pengfei; Takahashi, Eiji J.; Midorikawa, Katsumi [Extreme Photonics Research Group, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

    2010-11-15T23:59:59.000Z

    We present the optimization of the two-color synthesis method for generating an intense isolated attosecond pulse (IAP) in the multicycle regime. By mixing an infrared assistant pulse with a Ti:sapphire main pulse, we show that an IAP can be produced using a multicycle two-color pulse with a duration longer than 30 fs. We also discuss the influence of the carrier-envelope phase (CEP) and the relative intensity on the generation of IAPs. By optimizing the wavelength of the assistant field, IAP generation becomes insensitive to the CEP slip. Therefore, the optimized two-color method enables us to relax the requirements of pulse duration and easily produce the IAP with a conventional multicycle laser pulse. In addition, it enables us to markedly suppress the ionization of the harmonic medium. This is a major advantage for efficiently generating intense IAPs from a neutral medium by applying the appropriate phase-matching and energy-scaling techniques.

  20. Generating optimal states for a homodyne Bell test

    E-Print Network [OSTI]

    Sonja Daffer; Peter L. Knight

    2005-04-12T23:59:59.000Z

    We present a protocol that produces a conditionally prepared state that can be used for a Bell test based on homodyne detection. Based on the results of Munro [PRA 1999], the state is near-optimal for Bell-inequality violations based on quadrature-phase homodyne measurements that use correlated photon-number states. The scheme utilizes the Gaussian entanglement distillation protocol of Eisert et. al. [Annals of Phys. 2004] and uses only beam splitters and photodetection to conditionally prepare a non-Gaussian state from a source of two-mode squeezed states with low squeezing parameter, permitting a loophole-free test of Bell inequalities.

  1. Optimized Hydrogen and Electricity Generation from Wind | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment ofOil'sEnergy8 * October 2006 Optimize

  2. Computerized operating cost model for industrial steam generation

    SciTech Connect (OSTI)

    Powers, T.D.

    1983-02-01T23:59:59.000Z

    Pending EPA regulations, establishing revised emission levels for industrial boilers are perceived to have an effect on the relative costs of steam production technologies. To aid in the comparison of competitive boiler technologies, the Steam Cost Code was developed which provides levelized steam costs reflecting the effects of a number of key steam cost parameters. The Steam Cost Code is a user interactive FORTRAN program designed to operate on a VAX computer system. The program requires the user to input a number of variables describing the design characteristics, capital costs, and operating conditions for a specific boiler system. Part of the input to the Steam Cost Code is the capital cost of the steam production system. The capital cost is obtained from a program called INDCEPT, developed by Oak Ridge National Laboratory under Department of Energy, Morgantown Energy Technology Center sponsorship.

  3. MULTIOBJECTIVE OPTIMAL DESIGN OF SUPERCONDUCTING GENERATOR USING GENETIC ALGORITHM

    E-Print Network [OSTI]

    Coello, Carlos A. Coello

    Project(Super-GM) and successfully completed to verify electrical features in an electric power system, Itsuya Muta, Tsutomu Hoshino and Taketsune Nakamura Department of Electrical Engineering, Graduate School in this paper. In consideration of electrical and mechanical characteristics of superconducting generator

  4. Optimal distributed power generation under network load constraints

    E-Print Network [OSTI]

    Utrecht, Universiteit

    wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, mainly because of the development of novel components for decentral power generation (solar panels, small (DPG) refers to an electric power source such as solar, wind or combined heat power (CHP) connected

  5. Optimal control of aeroacoustic noise generated by cylinder vortex interaction

    E-Print Network [OSTI]

    Heinkenschloss, Matthias

    of the blade resulting in a strong dipole type acoustic source. The noise generated by BVI is particularly severe, leading to environmental noise pollution in commercial applications and increased observability the fluid dynamics and acoustic mechanisms that result from BVI as well as to validate predictive techniques

  6. Optimal Trajectory Generation for Manipulator Robots under Thermal Constraints

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of industrial robots is generally based on the operator's experience, regardless of the system's ex- act are compared then in section V to the analytical solution, and tested on a real industrial robot. II. TEMPERATURE PREDICTION FOR ROBOTIC SYSTEMS Minimizing the duration of robotic applications usually induces

  7. Optimal Placement and Sizing of Distributed Generator Units using Genetic Optimization

    E-Print Network [OSTI]

    -scale production units (e.g. fuel cells, micro-CHPs, photovoltaic panels) and the liberalization of the energy reliability, etc. This optimization problem can be solved in different ways like exhaustive searches [14

  8. Development of Optimal Catalyst Designs and Operating Strategies for

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:Revised Finding of No53197E T A * S HBatteries with Wide OperatingBatteriesCoupled

  9. Predictive energy Optimization: The Next Generation of Energy Management 

    E-Print Network [OSTI]

    Dickinson, P.

    2013-01-01T23:59:59.000Z

    energy management systems. A quantum leap in building intelligence is required to close the gap between the current state of building operations and the needs of smart grids and smart cities. Unfortunately for the building HVAC controls industry... information and other information and make informed decisions. These informed decisions present the quantum leap required to bridge the gap between buildings run on rules of thumb to the smart buildings required by smart grids and smart cities. Figure...

  10. Predictive energy Optimization: The Next Generation of Energy Management

    E-Print Network [OSTI]

    Dickinson, P.

    2013-01-01T23:59:59.000Z

    energy management systems. A quantum leap in building intelligence is required to close the gap between the current state of building operations and the needs of smart grids and smart cities. Unfortunately for the building HVAC controls industry... information and other information and make informed decisions. These informed decisions present the quantum leap required to bridge the gap between buildings run on rules of thumb to the smart buildings required by smart grids and smart cities. Figure...

  11. Hydrogen Operated Internal Combustion Engines – A New Generation Fuel

    E-Print Network [OSTI]

    B. Rajendra Prasath; E. Leelakrishnan; N. Lokesh; H. Suriyan; E. Guru Prakash; K. Omur; Mustaq Ahmed

    Abstract- The present scenario of the automotive and agricultural sectors is fairly scared with the depletion of fossil fuel. The researchers are working towards to find out the best replacement for the fossil fuel; if not at least to offset the total fuel demand. In regards to emission, the fuel in the form of gaseous state is much than liquid fuel. By considering the various aspects of fuel, hydrogen is expected as a best option when consider as a gaseous state fuel. It is identified as a best alternate fuel for internal combustion engines as well as power generation application, which can be produced easily by means of various processes. The hydrogen in the form of gas can be used in the both spark ignition and compression ignition engines for propelling the vehicles. The selected fuel is much cleaner and fuel efficient than conventional fuel. The present study focusing the various aspects and usage of hydrogen fuel in S.I engine and C.I engine. Keywords- Hydrogen, Spark ignition engine, compression ignition engine, performance, Emission I.

  12. Optimal working conditions for thermoelectric generators with realistic thermal coupling

    E-Print Network [OSTI]

    Apertet, Y; Glavatskaya, O; Goupil, C; Lecoeur, P

    2011-01-01T23:59:59.000Z

    We study how maximum output power can be obtained from a thermoelectric generator(TEG) with nonideal heat exchangers. We demonstrate with an analytic approach based on a force-flux formalism that the sole improvement of the intrinsic characteristics of thermoelectric modules including the enhancement of the figure of merit is of limited interest: the constraints imposed by the working conditions of the TEG must be considered on the same footing. Introducing an effective thermal conductance we derive the conditions which permit maximization of both efficiency and power production of the TEG dissipatively coupled to heat reservoirs. Thermal impedance matching must be accounted for as well as electrical impedance matching in order to maximize the output power. Our calculations also show that the thermal impedance does not only depend on the thermal conductivity at zero electrical current: it also depends on the TEG figure of merit. Our analysis thus yields both electrical and thermal conditions permitting optima...

  13. A power system includes an engine, a motor/generator operatively connected to the engine, and a starter operatively connected to at least one of the engine and the motor/generator.

    DOE Patents [OSTI]

    Hoff, Brian D. (East Peoria, IL); Algrain, Marcelo C. (Peoria, IL)

    2008-12-09T23:59:59.000Z

    A power system includes an engine, a motor/generator operatively connected to the engine, and a starter operatively connected to at least one of the engine and the motor/generator.

  14. Data Warehouse Model to Support Optimized Operation and Energy Savings in Buildings

    E-Print Network [OSTI]

    Stack, P.; Cahill, B.; Manzoor, F.; Menzel, K.

    2011-01-01T23:59:59.000Z

    University College Cork (Ireland) Department of Civil and Environmental Engineering Data Warehouse Model to support Optimized Operation and Energy Savings in Buildings Paul Stack, Brian Cahill, Farhan Manzoor, Prof. Karsten Menzel 20... October 2011 page 1ICEBO 2011 Session 10 - Brian Cahill University College Cork (Ireland) Department of Civil and Environmental Engineering ICT for Optimised Building Operation (ITOBO) 20 October 2011 ICEBO 2011 Session 10 - Brian Cahill page 2...

  15. Optimal meter placement and transaction-based loss allocation in deregulated power system operation

    E-Print Network [OSTI]

    Ding, Qifeng

    2005-02-17T23:59:59.000Z

    (OPF) algorithm to optimize the loss compensation if some transactions elect to purchase the loss service from the Independent System Operator (ISO) and accordingly the incurred losses are fairly allocated back to individual transactions. IEEE test... regulations have been causing the power industry to move rapidly toward the open transmission access, the unbundling of previously integrated services and the creation of regional transmission organizations (RTOs), Independent System Operators (ISOs) and so...

  16. Using a Randomized Path Planner to Generate 3D Task Demonstrations of Robot Operations

    E-Print Network [OSTI]

    Kabanza, Froduald

    Using a Randomized Path Planner to Generate 3D Task Demonstrations of Robot Operations Khaled for generating 3D tasks demonstrations involving a teleoperated robot arm on the International Space Station (ISS 3D animations that show how to perform a given task with the SSRMS. The current ATDG prototype

  17. How Run-of-River Operation Affects Hydropower Generation Henriette I. Jager Mark S. Bevelhimer

    E-Print Network [OSTI]

    Jager, Henriette I.

    How Run-of-River Operation Affects Hydropower Generation and Value Henriette I. Jager Æ Mark S) are mandated to protect aquatic biota, (2) decrease hydropower generation per unit flow, and (3) decrease energy revenue. We tested these three assump- tions by reviewing hydropower projects with license

  18. Teaching Sodium Fast Reactor Technology and Operation for the Present and Future Generations of SFR Users

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Teaching Sodium Fast Reactor Technology and Operation for the Present and Future Generations of SFR or development of sodium fast reactors and related experimental facilities. The sum of courses provided by CEA on sodium fast reactor design, technology, safety and operation experience, decommissioning aspects

  19. Boolean Operations on 3D Selective Nef Complexes: Data Structure, Algorithms, Optimized

    E-Print Network [OSTI]

    Mehlhorn, Kurt

    polyhedra and complexes are quite general. They can model non­manifold solids, unbounded solids, openBoolean Operations on 3D Selective Nef Complexes: Data Structure, Algorithms, Optimized, open and closed sets, mixed­dimensional complexes, and they are closed under all boolean

  20. Optimal operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionation

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Optimal operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionation · The Petlyuk distillation column, see Figure 1(a), with a pre-fractionator (C1) and a main column (C21 and C22) N-7465 Trondheim, Norway Abstract This work shows the unexpected result that over-fractionating one

  1. Optimal Operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionating

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Optimal Operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionating Vidar Trondheim, Norway Keywords: Distillation, Petlyuk, Divided-wall, Minimum energy Abstract This paper shows the unexpected result that over-fractionating one of the product streams in a Petlyuk distillation column may

  2. Control Structure Design for Optimal Operation of 4-Product Thermally Coupled Columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Control Structure Design for Optimal Operation of 4-Product Thermally Coupled Columns Deeptanshu: distillation, thermal coupling, Kaibel column, Petlyuk column Prepared for presentation at the James R. Fair distillation arrangements like Kaibel and Petlyuk columns can be challenging. This paper discusses the control

  3. Active Constraint Regions for Optimal Operation of Distillation Magnus G. Jacobsen and Sigurd Skogestad*

    E-Print Network [OSTI]

    Skogestad, Sigurd

    , NTNU, N-7491, Trondheim, Norway ABSTRACT: When designing the control structure of distillation columnsActive Constraint Regions for Optimal Operation of Distillation Columns Magnus G. Jacobsen presented in an earlier paper, to find how the active constraints for distillation columns change

  4. Optimal Operation of a Wind Farm equipped with a Storage Unit

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Optimal Operation of a Wind Farm equipped with a Storage Unit Paul Charton June 14, 2013 Keywords, viscosity solution, comparison principle. Abstract Due to the fluctuations in their production, wind farm. In particular wind energy is becoming more and more popular. Unlike other energy sources, the main drawback

  5. Degrees of freedom and optimal operation of simple heat pump cycles

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Degrees of freedom and optimal operation of simple heat pump cycles Jørgen Bauck Jensen and Sigurd in the opposite direction, the "heat pump", has recently become pop- ular. These two applications have also merged of performance for a heating cycle (heat pump) and a cooling cycle (refrigerator, A/C) are defined as COPh = Qh

  6. Bulk CMOS Device Optimization for High-Speed and Ultra-Low Power Operations

    E-Print Network [OSTI]

    Nyathi, Jabulani

    Bulk CMOS Device Optimization for High-Speed and Ultra-Low Power Operations Brent Bero and Jabulani- Interest in subthreshold design has increased due to the emergence of systems that require ultra-low power creating a clear divide between designing for high speed and ultra-low power. It might be beneficial

  7. Cost Optimal Operation of Thermal Energy Storage System with Real-Time Prices

    E-Print Network [OSTI]

    Cost Optimal Operation of Thermal Energy Storage System with Real-Time Prices Toru Kashima, Member of the result [4]. The same can be said for time varying real-time prices. Real-time energy pricing is not yet such as chillers. Energy resources such as electricity or natural gas are bought from suppliers at certain prices

  8. Energy Efficient DSL via Heterogeneous Sleeping States: Optimization Structures and Operation

    E-Print Network [OSTI]

    transitions is lower both in energy and time. The power consumption at L3 is zero but the switching cost for LEnergy Efficient DSL via Heterogeneous Sleeping States: Optimization Structures and Operation University, USA, 2 ESAT-SCD, KU Leuven, Belgium, 3 ASSIA, Inc., USA Abstract--Switching off a DSL line

  9. A Semi-Lagrangian Approach for Natural Gas Storage Valuation and Optimal Operation

    E-Print Network [OSTI]

    Forsyth, Peter A.

    A Semi-Lagrangian Approach for Natural Gas Storage Valuation and Optimal Operation Zhuliang Chen such as fuel and electricity, natural gas prices exhibit seasonality dynamics due to fluctuations in demand [28]. As such, natural gas storage facilities are constructed to provide a cushion for such fluctuations

  10. Continuous Control Primitive Trajectory Generation and Optimal Motion Splines for All-Wheel Steering Mobile

    E-Print Network [OSTI]

    Kelly, Alonzo

    algorithms based on the Ackermann, differential drive, or omnidirectional steering models. Ackerman with all-wheel steering capability differ from these models in that the velocity vector can be aimed in anyContinuous Control Primitive Trajectory Generation and Optimal Motion Splines for All

  11. Optimal Integration of Renewable Energy Resources in Data Centers with Behind-the-Meter Renewable Generator

    E-Print Network [OSTI]

    Mohsenian-Rad, Hamed

    1 Optimal Integration of Renewable Energy Resources in Data Centers with Behind-the-Meter Renewable-- Renewable energy resources, such as wind and solar power, are rapidly becoming generation technologies-temporal variations, the integration of renewable energy resources is usually very challenging. Some of the previously

  12. Modeling and Optimization of Next Generation Feedstock Development for Chemical Process

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    Modeling and Optimization of Next Generation Feedstock Development for Chemical Process Industry -Glutamic acid Anaerobic digestion mass Cellulose Biogas Bio oil Gasoline Diesel Butanol Dimethyl ether,Oil Polyol Biodiesel Glycerin Naphtha and Diesel Liquefaction / d h l Thermo chemical Protein Protein

  13. Probability-Based Software for Grid Optimization: Improved Power System Operations Using Advanced Stochastic Optimization

    SciTech Connect (OSTI)

    None

    2012-02-24T23:59:59.000Z

    GENI Project: Sandia National Laboratories is working with several commercial and university partners to develop software for market management systems (MMSs) that enable greater use of renewable energy sources throughout the grid. MMSs are used to securely and optimally determine which energy resources should be used to service energy demand across the country. Contributions of electricity to the grid from renewable energy sources such as wind and solar are intermittent, introducing complications for MMSs, which have trouble accommodating the multiple sources of price and supply uncertainties associated with bringing these new types of energy into the grid. Sandia’s software will bring a new, probability-based formulation to account for these uncertainties. By factoring in various probability scenarios for electricity production from renewable energy sources in real time, Sandia’s formula can reduce the risk of inefficient electricity transmission, save ratepayers money, conserve power, and support the future use of renewable energy.

  14. Insertion of operation-and-indicate instructions for optimized SIMD code

    DOE Patents [OSTI]

    Eichenberger, Alexander E; Gara, Alan; Gschwind, Michael K

    2013-06-04T23:59:59.000Z

    Mechanisms are provided for inserting indicated instructions for tracking and indicating exceptions in the execution of vectorized code. A portion of first code is received for compilation. The portion of first code is analyzed to identify non-speculative instructions performing designated non-speculative operations in the first code that are candidates for replacement by replacement operation-and-indicate instructions that perform the designated non-speculative operations and further perform an indication operation for indicating any exception conditions corresponding to special exception values present in vector register inputs to the replacement operation-and-indicate instructions. The replacement is performed and second code is generated based on the replacement of the at least one non-speculative instruction. The data processing system executing the compiled code is configured to store special exception values in vector output registers, in response to a speculative instruction generating an exception condition, without initiating exception handling.

  15. Optimal discrimination of quantum states on a two-dimensional Hilbert space by local operations and classical communication

    E-Print Network [OSTI]

    Kenji Nakahira; Tsuyoshi Sasaki Usuda

    2015-01-26T23:59:59.000Z

    We study the discrimination of multipartite quantum states by local operations and classical communication. We derive that any optimal discrimination of quantum states spanning a two-dimensional Hilbert space in which each party's space is finite dimensional is possible by local operations and one-way classical communication, regardless of the optimality criterion used and how entangled the states are.

  16. Operational control and maintenance integrity of typical and atypical coil tube steam generating systems

    SciTech Connect (OSTI)

    Beardwood, E.S.

    1999-07-01T23:59:59.000Z

    Coil tube steam generators are low water volume to boiler horsepower (bhp) rating, rapid steaming units which occupy substantially less space per boiler horsepower than equivalent conventional tire tube and water tube boilers. These units can be retrofitted into existing steam systems with relative ease and are more efficient than the generators they replace. During the early 1970's they became a popular choice for steam generation in commercial, institutional and light to medium industrial applications. Although these boiler designs do not require skilled or certified operators, an appreciation for a number of the operational conditions that result in lower unscheduled maintenance, increased reliability and availability cycles would be beneficial to facility owners, managers, and operators. Conditions which afford lower operating and maintenance costs will be discussed from a practical point of view. An overview of boiler design and operation is also included. Pitfalls are provided for operational and idle conditions. Water treatment application, as well as steam system operations not conducive to maintaining long term system integrity; with resolutions, will be addressed.

  17. Operational experience and maintenance programs of Transamerica Delaval, Inc., diesel generators

    SciTech Connect (OSTI)

    Rajan, J.R.

    1994-05-01T23:59:59.000Z

    Concerns regarding the reliability of large-bore, medium-speed diesel generators manufactured by Transamerica Delaval, Inc. (TDI) for application at domestic nuclear plants were first prompted by a crankshaft failure at Shoreham Nuclear Power Station in August 1983. A number of diesel generator components were identified which had potential deficiencies from a manufacturing and operational standpoint. In response to these problems, 11 (now 8) U.S. nuclear utility owners formed a TDI Diesel Generator Owners Group (Owners Group) to address operational and regulatory issues relative to diesel generator sets used for standby emergency power. The Owners` Group performed extensive design reviews of all key engine components and developed recommendations to be implemented by the individual owners concerning needed component replacements and modifications, component inspections to validate the {open_quotes}as-manufactured{close_quotes} and {open_quotes}as-assembled{close_quotes} quality of key engine components, engine testing, and an enhanced maintenance and surveillance program.

  18. Models, Calculation and Optimization of Gas Networks, Equipment and Contracts for Design, Operation, Booking and Accounting

    E-Print Network [OSTI]

    Ostromuhov, Leonid A

    2011-01-01T23:59:59.000Z

    There are proposed models of contracts, technological equipment and gas networks and methods of their optimization. The flow in network undergoes restrictions of contracts and equipment to be operated. The values of sources and sinks are provided by contracts. The contract models represent (sub-) networks. The simplest contracts represent either nodes or edges. Equipment is modeled by edges. More sophisticated equipment is represented by sub-networks. Examples of such equipment are multi-poles and compressor stations with many entries and exits. The edges can be of different types corresponding to equipment and contracts. On such edges, there are given systems of equation and inequalities simulating the contracts and equipment. On this base, the methods proposed that allow: calculation and control of contract values for booking on future days and for accounting of sales and purchases; simulation and optimization of design and of operation of gas networks. These models and methods are realized in software syst...

  19. Cavity-enhanced second harmonic generation via nonlinear-overlap optimization

    E-Print Network [OSTI]

    Lin, Zin; Loncar, Marko; Johnson, Steven G; Rodriguez, Alejandro W

    2015-01-01T23:59:59.000Z

    We describe an approach based on topology optimization that enables automatic discovery of wavelength-scale photonic structures for achieving high-efficiency second-harmonic generation (SHG). A key distinction from previous formulation and designs that seek to maximize Purcell factors at individual frequencies is that our method not only aims to achieve frequency matching (across an entire octave) and large radiative lifetimes, but also optimizes the equally important nonlinear--coupling figure of merit $\\bar{\\beta}$, involving a complicated spatial overlap-integral between modes. We apply this method to the particular problem of optimizing micropost and grating-slab cavities (one-dimensional multilayered structures) and demonstrate that a variety of material platforms can support modes with the requisite frequencies, large lifetimes $Q \\gtrsim 10^3$, small modal volumes $\\sim (\\lambda/n)^3$, and extremely large $\\bar{\\beta} \\gtrsim 10^{-2}$, orders of magnitude larger than the state of the art.

  20. Optimal energy-harvesting cycles for load-driven dielectric generators in plane strain

    E-Print Network [OSTI]

    R. Springhetti; E. Bortot; G. deBotton; M. Gei

    2014-03-13T23:59:59.000Z

    The performances of energy harvesting generators based on dielectric elastomers are investigated. The configuration is of a thin dielectric film coated by stretchable electrodes at both sides. The film is first stretched, then charged and subsequently, afterwards it is released, and finally the charge is harvested at a higher electric potential. The amount of energy extracted by this cycle is bounded by the electric breakdown and the ultimate stretch ratio of the film as well as by structural instabilities due to loss of tension. To identify the optimal cycle that complies with these limits we formulate a constraint optimization problem and solve it with a dedicated solver for two typical classes of elastic dielectrics. As anticipated, we find that the performance of the generator depends critically on the ultimate stretch ratio of the film. However, more surprising is our finding of a universal limit on the dielectric strength of the film beyond which the optimal cycle is independent of this parameter. Thus, we reveal that, regardless of how large the dielectric strength of the material is, there is an upper bound on the amount of harvested energy that depends only on the ultimate stretch ratio. We conclude the work with detailed calculations of the optimal cycles for two commercially available elastic dielectrics.

  1. Optimizing Geographic Allotment of Photovoltaic Capacity in a Distributed Generation Setting: Preprint

    SciTech Connect (OSTI)

    Urquhart, B.; Sengupta, M.; Keller, J.

    2012-09-01T23:59:59.000Z

    A multi-objective optimization was performed to allocate 2MW of PV among four candidate sites on the island of Lanai such that energy was maximized and variability in the form of ramp rates was minimized. This resulted in an optimal solution set which provides a range of geographic allotment alternatives for the fixed PV capacity. Within the optimal set, a tradeoff between energy produced and variability experienced was found, whereby a decrease in variability always necessitates a simultaneous decrease in energy. A design point within the optimal set was selected for study which decreased extreme ramp rates by over 50% while only decreasing annual energy generation by 3% over the maximum generation allocation. To quantify the allotment mix selected, a metric was developed, called the ramp ratio, which compares ramping magnitude when all capacity is allotted to a single location to the aggregate ramping magnitude in a distributed scenario. The ramp ratio quantifies simultaneously how much smoothing a distributed scenario would experience over single site allotment and how much a single site is being under-utilized for its ability to reduce aggregate variability. This paper creates a framework for use by cities and municipal utilities to reduce variability impacts while planning for high penetration of PV on the distribution grid.

  2. Tool-Assisted Unit-Test Generation and Selection Based on Operational Abstractions

    E-Print Network [OSTI]

    Xie, Tao

    Tool-Assisted Unit-Test Generation and Selection Based on Operational Abstractions Tao Xie1 of Washington, Seattle, WA 98105 Abstract. Unit testing, a common step in software development, presents a chal- lenge. When produced manually, unit test suites are often insufficient to identify defects. The main

  3. Operation and Control of Distribution Systems with high level integration of Renewable Generation units

    E-Print Network [OSTI]

    Bak-Jensen, Birgitte

    models Probabilistic methodologies are being applied to power system analysis since 70' [9] becauseOperation and Control of Distribution Systems with high level integration of Renewable Generation. Diagonal 649 Pavelló A, 08028 Barcelona, Spain Summary Traditional power systems have a hierarchical

  4. Optimizing the CEBAF Injector for Beam Operation with a Higher Voltage Electron Gun

    E-Print Network [OSTI]

    Hannon, F E; Kazimi, R

    2011-01-01T23:59:59.000Z

    Recent developments in the DC gun technology used at CEBAF have allowed an increase in operational voltage from 100kV to 130kV. In the near future this will be extended further to 200kV with the purchase of a new power supply. The injector components and layout at this time have been designed specifically for 100kV operation. It is anticipated that with an increase in gun voltage and optimization of the layout and components for 200kV operation, that the electron bunch length and beam brightness can be improved upon. This paper explores some upgrade possibilities for a 200kV gun CEBAF injector through beam dynamic simulations.

  5. Optimizing the CEBAF Injector for Beam Operation with a Higher Voltage Electron Gun

    SciTech Connect (OSTI)

    F.E. Hannon, A.S. Hofler, R. Kazimi

    2011-03-01T23:59:59.000Z

    Recent developments in the DC gun technology used at CEBAF have allowed an increase in operational voltage from 100kV to 130kV. In the near future this will be extended further to 200kV with the purchase of a new power supply. The injector components and layout at this time have been designed specifically for 100kV operation. It is anticipated that with an increase in gun voltage and optimization of the layout and components for 200kV operation, that the electron bunch length and beam brightness can be improved upon. This paper explores some upgrade possibilities for a 200kV gun CEBAF injector through beam dynamic simulations.

  6. Operational-Condition-Independent Criteria Dedicated to Monitoring Wind Turbine Generators: Preprint

    SciTech Connect (OSTI)

    Yang, W.; Sheng, S.; Court, R.

    2012-08-01T23:59:59.000Z

    To date the existing wind turbine condition monitoring technologies and commercially available systems have not been fully accepted for improving wind turbine availability and reducing their operation and maintenance costs. One of the main reasons is that wind turbines are subject to constantly varying loads and operate at variable rotational speeds. As a consequence, the influences of turbine faults and the effects of varying load and speed are coupled together in wind turbine condition monitoring signals. So, there is an urgent need to either introduce some operational condition de-coupling procedures into the current wind turbine condition monitoring techniques or develop a new operational condition independent wind turbine condition monitoring technique to maintain high turbine availability and achieve the expected economic benefits from wind. The purpose of this paper is to develop such a technique. In the paper, three operational condition independent criteria are developed dedicated for monitoring the operation and health condition of wind turbine generators. All proposed criteria have been tested through both simulated and practical experiments. The experiments have shown that these criteria provide a solution for detecting both mechanical and electrical faults occurring in wind turbine generators.

  7. Real-Time Combined Heat and Power Operational Strategy Using a Hierarchical Optimization Algorithm

    SciTech Connect (OSTI)

    Yun, Kyung Tae; Cho, Heejin; Luck, Rogelio; Mago, Pedro J.

    2011-06-01T23:59:59.000Z

    Existing attempts to optimize the operation of Combined Heat and Power (CHP) systems for building applications have two major limitations: the electrical and thermal loads are obtained from historical weather profiles; and the CHP system models ignore transient responses by using constant equipment efficiencies. This paper considers the transient response of a building combined with a hierarchical CHP optimal control algorithm to obtain a real-time integrated system that uses the most recent weather and electric load information. This is accomplished by running concurrent simulations of two transient building models. The first transient building model uses current as well as forecast input information to obtain short term predictions of the thermal and electric building loads. The predictions are then used by an optimization algorithm, i.e., a hierarchical controller, that decides the amount of fuel and of electrical energy to be allocated at the current time step. In a simulation, the actual physical building is not available and, hence, to simulate a real-time environment, a second, building model with similar but not identical input loads are used to represent the actual building. A state-variable feedback loop is completed at the beginning of each time step by copying, i.e., measuring, the state variable from the actual building and restarting the predictive model using these ?measured? values as initial conditions. The simulation environment presented in this paper features nonlinear effects such as the dependence of the heat exchanger effectiveness on their operating conditions. The results indicate that the CHP engine operation dictated by the proposed hierarchical controller with uncertain weather conditions have the potential to yield significant savings when compared to conventional systems using current values of electricity and fuel prices.

  8. MagRad: A code to optimize the operation of superconducting magnets in a radiation environment

    SciTech Connect (OSTI)

    Yeaw, C.T.

    1995-12-31T23:59:59.000Z

    A powerful computational tool, called MagRad, has been developed which optimizes magnet design for operation in radiation fields. Specifically, MagRad has been used for the analysis and design modification of the cable-in-conduit conductors of the TF magnet systems in fusion reactor designs. Since the TF magnets must operate in a radiation environment which damages the material components of the conductor and degrades their performance, the optimization of conductor design must account not only for start-up magnet performance, but also shut-down performance. The degradation in performance consists primarily of three effects: reduced stability margin of the conductor; a transition out of the well-cooled operating regime; and an increased maximum quench temperature attained in the conductor. Full analysis of the magnet performance over the lifetime of the reactor includes: radiation damage to the conductor, stability, protection, steady state heat removal, shielding effectiveness, optimal annealing schedules, and finally costing of the magnet and reactor. Free variables include primary and secondary conductor geometric and compositional parameters, as well as fusion reactor parameters. A means of dealing with the radiation damage to the conductor, namely high temperature superconductor anneals, is proposed, examined, and demonstrated to be both technically feasible and cost effective. Additionally, two relevant reactor designs (ITER CDA and ARIES-II/IV) have been analyzed. Upon addition of pure copper strands to the cable, the ITER CDA TF magnet design was found to be marginally acceptable, although much room for both performance improvement and cost reduction exists. A cost reduction of 10-15% of the capital cost of the reactor can be achieved by adopting a suitable superconductor annealing schedule. In both of these reactor analyses, the performance predictive capability of MagRad and its associated costing techniques have been demonstrated.

  9. Turbine Reliability and Operability Optimization through the use of Direct Detection Lidar Final Technical Report

    SciTech Connect (OSTI)

    Johnson, David K; Lewis, Matthew J; Pavlich, Jane C; Wright, Alan D; Johnson, Kathryn E; Pace, Andrew M

    2013-02-01T23:59:59.000Z

    The goal of this Department of Energy (DOE) project is to increase wind turbine efficiency and reliability with the use of a Light Detection and Ranging (LIDAR) system. The LIDAR provides wind speed and direction data that can be used to help mitigate the fatigue stress on the turbine blades and internal components caused by wind gusts, sub-optimal pointing and reactionary speed or RPM changes. This effort will have a significant impact on the operation and maintenance costs of turbines across the industry. During the course of the project, Michigan Aerospace Corporation (MAC) modified and tested a prototype direct detection wind LIDAR instrument; the resulting LIDAR design considered all aspects of wind turbine LIDAR operation from mounting, assembly, and environmental operating conditions to laser safety. Additionally, in co-operation with our partners, the National Renewable Energy Lab and the Colorado School of Mines, progress was made in LIDAR performance modeling as well as LIDAR feed forward control system modeling and simulation. The results of this investigation showed that using LIDAR measurements to change between baseline and extreme event controllers in a switching architecture can reduce damage equivalent loads on blades and tower, and produce higher mean power output due to fewer overspeed events. This DOE project has led to continued venture capital investment and engagement with leading turbine OEMs, wind farm developers, and wind farm owner/operators.

  10. Analysis of oscillation characteristics and optimal conditions for high power operation of Gyrotron FU CW GIII

    SciTech Connect (OSTI)

    Tatematsu, Y., E-mail: tatema@fir.u-fukui.ac.jp; Yamaguchi, Y.; Kawase, T.; Ichioka, R.; Ogawa, I.; Saito, T.; Idehara, T. [Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507 (Japan)

    2014-08-15T23:59:59.000Z

    The oscillation characteristics of Gyrotron FU CW GIII and its wave frequency and output power dependences on the magnetic field strength, the gun coil current, and the anode voltage were investigated experimentally. The experimental results were analyzed theoretically using a self-consistent code that included the electron properties in the cavity, corresponding to the actual operating conditions in the experiments. As a result, it was found that the variation in frequency with the magnetic field strength was related to an axial profile change in the electromagnetic wave in the cavity. In addition, the optimal condition that gives the maximum output power was found to be determined by the pitch factor rather than by the electron beam radius under the given operating conditions.

  11. A Systems Engineering Framework for Design, Construction and Operation of the Next Generation Nuclear Plant

    SciTech Connect (OSTI)

    Edward J. Gorski; Charles V. Park; Finis H. Southworth

    2004-06-01T23:59:59.000Z

    Not since the International Space Station has a project of such wide participation been proposed for the United States. Ten countries, the European Union, universities, Department of Energy (DOE) laboratories, and industry will participate in the research and development, design, construction and/or operation of the fourth generation of nuclear power plants with a demonstration reactor to be built at a DOE site and operational by the middle of the next decade. This reactor will be like no other. The Next Generation Nuclear Plant (NGNP) will be passively safe, economical, highly efficient, modular, proliferation resistant, and sustainable. In addition to electrical generation, the NGNP will demonstrate efficient and cost effective generation of hydrogen to support the President’s Hydrogen Initiative. To effectively manage this multi-organizational and technologically complex project, systems engineering techniques and processes will be used extensively to ensure delivery of the final product. The technological and organizational challenges are complex. Research and development activities are required, material standards require development, hydrogen production, storage and infrastructure requirements are not well developed, and the Nuclear Regulatory Commission may further define risk-informed/performance-based approach to licensing. Detailed design and development will be challenged by the vast cultural and institutional differences across the participants. Systems engineering processes must bring the technological and organizational complexity together to ensure successful product delivery. This paper will define the framework for application of systems engineering to this $1.5B - $1.9B project.

  12. Coupled Operation of a Wind Farm and Pumped Storage Facility: Techno-Economic Modelling and Stochastic Optimization

    E-Print Network [OSTI]

    Victoria, University of

    Coupled Operation of a Wind Farm and Pumped Storage Facility: Techno-Economic Modelling Operation of a Wind Farm and Pumped Storage Facility: Techno-Economic Modelling and Stochastic Optimization a stochastic programming approach to the techno-economic analysis of a wind farm coupled with a pumped storage

  13. Optimal Operation of a Waste Incineration Plant for District Heating Johannes Jaschke, Helge Smedsrud, Sigurd Skogestad*, Henrik Manum

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Optimal Operation of a Waste Incineration Plant for District Heating Johannes J¨aschke, Helge@chemeng.ntnu.no off-line. This systematic approach is here applied to a waste incineration plant for district heating. In district heating networks, operators usually wish to ob- tain the lowest possible return temperature

  14. Generation and Optimization of Test cases for Object-Oriented Software Using State Chart Diagram

    E-Print Network [OSTI]

    Swain, Ranjita Kumari; Mohapatra, Durga Prasad

    2012-01-01T23:59:59.000Z

    The process of testing any software system is an enormous task which is time consuming and costly. The time and required effort to do sufficient testing grow, as the size and complexity of the software grows, which may cause overrun of the project budget, delay in the development of software system or some test cases may not be covered. During SDLC (software development life cycle), generally the software testing phase takes around 40-70% of the time and cost. State-based testing is frequently used in software testing. Test data generation is one of the key issues in software testing. A properly generated test suite may not only locate the errors in a software system, but also help in reducing the high cost associated with software testing. It is often desired that test data in the form of test sequences within a test suite can be automatically generated to achieve required test coverage. This paper proposes an optimization approach to test data generation for the state-based software testing. In this paper, ...

  15. Genetic algorithm applied to the optimization of quantum cascade lasers with second harmonic generation

    SciTech Connect (OSTI)

    Gaji?, A. [School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade (Serbia); Telekom Srbija, a.d., Takovska 2, 11000 Belgrade (Serbia); Radovanovi?, J., E-mail: radovanovic@etf.bg.ac.rs; Milanovi?, V. [School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade (Serbia); Indjin, D.; Ikoni?, Z. [School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT (United Kingdom)

    2014-02-07T23:59:59.000Z

    A computational model for the optimization of the second order optical nonlinearities in GaInAs/AlInAs quantum cascade laser structures is presented. The set of structure parameters that lead to improved device performance was obtained through the implementation of the Genetic Algorithm. In the following step, the linear and second harmonic generation power were calculated by self-consistently solving the system of rate equations for carriers and photons. This rate equation system included both stimulated and simultaneous double photon absorption processes that occur between the levels relevant for second harmonic generation, and material-dependent effective mass, as well as band nonparabolicity, were taken into account. The developed method is general, in the sense that it can be applied to any higher order effect, which requires the photon density equation to be included. Specifically, we have addressed the optimization of the active region of a double quantum well In{sub 0.53}Ga{sub 0.47}As/Al{sub 0.48}In{sub 0.52}As structure and presented its output characteristics.

  16. Optimal selection of on-site generation with combined heat andpower applications

    SciTech Connect (OSTI)

    Siddiqui, Afzal S.; Marnay, Chris; Bailey, Owen; HamachiLaCommare, Kristina

    2004-11-30T23:59:59.000Z

    While demand for electricity continues to grow, expansion of the traditional electricity supply system, or macrogrid, is constrained and is unlikely to keep pace with the growing thirst western economies have for electricity. Furthermore, no compelling case has been made that perpetual improvement in the overall power quality and reliability (PQR)delivered is technically possible or economically desirable. An alternative path to providing high PQR for sensitive loads would generate close to them in microgrids, such as the Consortium for Electricity Reliability Technology Solutions (CERTS) Microgrid. Distributed generation would alleviate the pressure for endless improvement in macrogrid PQR and might allow the establishment of a sounder economically based level of universal grid service. Energy conversion from available fuels to electricity close to loads can also provide combined heat and power (CHP) opportunities that can significantly improve the economics of small-scale on-site power generation, especially in hot climates when the waste heat serves absorption cycle cooling equipment that displaces expensive on-peak electricity. An optimization model, the Distributed Energy Resources Customer Adoption Model (DER-CAM), developed at Berkeley Lab identifies the energy bill minimizing combination of on-site generation and heat recovery equipment for sites, given their electricity and heat requirements, the tariffs they face, and a menu of available equipment. DER-CAM is used to conduct a systemic energy analysis of a southern California naval base building and demonstrates atypical current economic on-site power opportunity. Results achieve cost reductions of about 15 percent with DER, depending on the tariff.Furthermore, almost all of the energy is provided on-site, indicating that modest cost savings can be achieved when the microgrid is free to select distributed generation and heat recovery equipment in order to minimize its over all costs.

  17. Optimization of Fuel Cell System Operating Conditions for Fuel Cell Vehicles

    E-Print Network [OSTI]

    Zhao, Hengbing; Burke, Andy

    2008-01-01T23:59:59.000Z

    A.F. Burke, Modeling and Optimization of PEMFC Systems andPEM Fuel Cell System Optimization, Proceedings of the 2 ndof the fuel cell system optimization model Fig. 5 Flowchart

  18. Detailed analysis of an endoreversible fuel cell : Maximum power and optimal operating temperature determination

    E-Print Network [OSTI]

    A. Vaudrey; P. Baucour; F. Lanzetta; R. Glises

    2010-08-30T23:59:59.000Z

    Producing useful electrical work in consuming chemical energy, the fuel cell have to reject heat to its surrounding. However, as it occurs for any other type of engine, this thermal energy cannot be exchanged in an isothermal way in finite time through finite areas. As it was already done for various types of systems, we study the fuel cell within the finite time thermodynamics framework and define an endoreversible fuel cell. Considering different types of heat transfer laws, we obtain an optimal value of the operating temperature, corresponding to a maximum produced power. This analysis is a first step of a thermodynamical approach of design of thermal management devices, taking into account performances of the whole system.

  19. Detailed analysis of an endoreversible fuel cell : Maximum power and optimal operating temperature determination

    E-Print Network [OSTI]

    Vaudrey, A; Lanzetta, F; Glises, R

    2009-01-01T23:59:59.000Z

    Producing useful electrical work in consuming chemical energy, the fuel cell have to reject heat to its surrounding. However, as it occurs for any other type of engine, this thermal energy cannot be exchanged in an isothermal way in finite time through finite areas. As it was already done for various types of systems, we study the fuel cell within the finite time thermodynamics framework and define an endoreversible fuel cell. Considering different types of heat transfer laws, we obtain an optimal value of the operating temperature, corresponding to a maximum produced power. This analysis is a first step of a thermodynamical approach of design of thermal management devices, taking into account performances of the whole system.

  20. Optimization of Preprocessing and Densification of Sorghum Stover at Full-scale Operation

    SciTech Connect (OSTI)

    Neal A. Yancey; Jaya Shankar Tumuluru; Craig C. Conner; Christopher T. Wright

    2011-08-01T23:59:59.000Z

    Transportation costs can be a prohibitive step in bringing biomass to a preprocessing location or biofuel refinery. One alternative to transporting biomass in baled or loose format to a preprocessing location, is to utilize a mobile preprocessing system that can be relocated to various locations where biomass is stored, preprocess and densify the biomass, then ship it to the refinery as needed. The Idaho National Laboratory has a full scale 'Process Demonstration Unit' PDU which includes a stage 1 grinder, hammer mill, drier, pellet mill, and cooler with the associated conveyance system components. Testing at bench and pilot scale has been conducted to determine effects of moisture on preprocessing, crop varieties on preprocessing efficiency and product quality. The INLs PDU provides an opportunity to test the conclusions made at the bench and pilot scale on full industrial scale systems. Each component of the PDU is operated from a central operating station where data is collected to determine power consumption rates for each step in the process. The power for each electrical motor in the system is monitored from the control station to monitor for problems and determine optimal conditions for the system performance. The data can then be viewed to observe how changes in biomass input parameters (moisture and crop type for example), mechanical changes (screen size, biomass drying, pellet size, grinding speed, etc.,), or other variations effect the power consumption of the system. Sorgum in four foot round bales was tested in the system using a series of 6 different screen sizes including: 3/16 in., 1 in., 2 in., 3 in., 4 in., and 6 in. The effect on power consumption, product quality, and production rate were measured to determine optimal conditions.

  1. EIS-0302: Transfer of the Heat Source/Radioisotope Thermoelectric Generator Assembly and Test Operations From the Mound Site

    Broader source: Energy.gov [DOE]

    This EIS analyzes DOE's proposed transfer of the Heat Source/Radioisotope Thermoelectric Generator (HS/RTG) operations at the Mound Site near Miamisburg, Ohio, to an alternative DOE site.

  2. Project Title: Small Scale Electrical Power Generation from Heat Co-Produced in Geothermal Fluids: Mining Operation

    SciTech Connect (OSTI)

    Clark, Thomas M [Principal Investigator; Erlach, Celeste [Communications Mgr.

    2014-12-30T23:59:59.000Z

    Demonstrate the technical and economic feasibility of small scale power generation from low temperature co-produced fluids. Phase I is to Develop, Design and Test an economically feasible low temperature ORC solution to generate power from lower temperature co-produced geothermal fluids. Phase II &III are to fabricate, test and site a fully operational demonstrator unit on a gold mine working site and operate, remotely monitor and collect data per the DOE recommended data package for one year.

  3. Has Restructuring Improved Operating Efficiency at U.S. Electricity Generating Plants?

    E-Print Network [OSTI]

    Fabrizio, Kira; Rose, Nancy; Wolfram, Catherine

    2004-01-01T23:59:59.000Z

    Cost Efficiency of Electric Generating Plants: A Stochasticat US Electricity Generating Plants? Kira Markiewicz, Nancyat US Electricity Generating Plants? Kira Markiewicz UC

  4. Research Support in Hungary Machine scheduling LED public lighting Microsimulation in public transportation Finally Optimization and Operation Research methods for

    E-Print Network [OSTI]

    Balázs, Bánhelyi

    Euros per full time researcher year. The Hungarian research support scheme has several other smallerResearch Support in Hungary Machine scheduling LED public lighting Microsimulation in public transportation Finally Optimization and Operation Research methods for Real Life Industrial Problems Tibor

  5. Systems Modeling and Analysis Industrial Engineers are interested in optimizing the design and operation of complex systems

    E-Print Network [OSTI]

    Dyer, Bill

    Systems Modeling and Analysis Industrial Engineers are interested in optimizing the design and operation of complex systems composed of people and machines using information, materials and energy to produce goods and services. Analyzing such systems with information-driven models is an essential step

  6. System Modeling and Design Optimization for a Next-Generation Unattended Sensor

    SciTech Connect (OSTI)

    McDonald, Benjamin S.; Myjak, Mitchell J.; Hensley, Walter K.; Smart, John E.

    2013-04-01T23:59:59.000Z

    We are developing a next-generation unattendedsensor that can detect and identify radiation sources while operating on battery power for several weeks. The system achieves smaller size and weight over systems that use NaI:Tl and 3He detectors by using a relatively new scintillator, Cs2LiYCl6:Ce:Ce (CLYC). This material can detect both gamma rays and thermal neutrons, has energy resolution of ~4% full width at half maximum at 662 keV, and allows for particle discrimination by pulse amplitude as well as pulse shape. The overall design features an array of sixteen CLYC detectors, each read out by a photomultiplier tube and custom pulse processing electronics. A field-programmable gate array analyzes the energy spectra using computationally efficient algorithms for anomaly detection.

  7. Has Restructuring Improved Operating Efficiency at U.S. Electricity Generating Plants?

    E-Print Network [OSTI]

    Fabrizio, Kira; Rose, Nancy; Wolfram, Catherine

    2004-01-01T23:59:59.000Z

    in electricity generation, relative to IOU plants in stateselectricity generation sector restructuring in the United States on plant-plant over the year, measured by annual net megawatt-hours of electricity generation,

  8. Capacity analysis, cycle time optimization, and supply chain strategy in multi-product biopharmaceutical manufacturing operations

    E-Print Network [OSTI]

    Fetcho-Phillips, Kacey L. (Kacey Lynn)

    2011-01-01T23:59:59.000Z

    Application of system optimization theory, supply chain principles, and capacity modeling are increasingly valuable tools for use in pharmaceutical manufacturing facilities. The dynamics of the pharmaceutical industry - ...

  9. A New Coarsening Operator for the Optimal Preconditioning of the Dual and Primal Domain Decomposition Methods

    E-Print Network [OSTI]

    Spatiales Universit'e de Li`ege Rue Ernest Solvay, 21, B­4000 Li`ege, Belgium Abstract We present an optimal

  10. Optimal Technology Investment and Operation in Zero-Net-Energy Buildings with Demand Response

    E-Print Network [OSTI]

    Stadler, Michael

    2009-01-01T23:59:59.000Z

    optimal could be acquired. Battery storage costs are roughlylead/acid battery) and thermal storage capabilities wereis limited by battery size - Heat storage is limited by

  11. Modeling and experiments on differential pumping in linear plasma generators operating at high gas flows

    SciTech Connect (OSTI)

    Eck, H. J. N. van; Koppers, W. R.; Rooij, G. J. van; Goedheer, W. J.; Cardozo, N. J. Lopes; Kleyn, A. W. [FOM-Institute for Plasma Physics Rijnhuizen, Association EURATOM-FOM, Trilateral Euregio Cluster, P.O. Box 1207, 3430 BE Nieuwegein (Netherlands); Engeln, R.; Schram, D. C. [Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)

    2009-03-15T23:59:59.000Z

    The direct simulation Monte Carlo (DSMC) method was used to investigate the efficiency of differential pumping in linear plasma generators operating at high gas flows. Skimmers are used to separate the neutrals from the plasma beam, which is guided from the source to the target by a strong axial magnetic field. In this way, the neutrals are prevented to reach the target region. The neutral flux to the target must be lower than the plasma flux to enable ITER relevant plasma-surface interaction (PSI) studies. It is therefore essential to control the neutral gas dynamics. The DSMC method was used to model the expansion of a hot gas in a low pressure vessel where a small discrepancy in shock position was found between the simulations and a well-established empirical formula. Two stage differential pumping was modeled and applied in the linear plasma devices Pilot-PSI and PLEXIS. In Pilot-PSI a factor of 4.5 pressure reduction for H{sub 2} has been demonstrated. Both simulations and experiments showed that the optimum skimmer position depends on the position of the shock and therefore shifts for different gas parameters. The shape of the skimmer has to be designed such that it has a minimum impact on the shock structure. A too large angle between the skimmer and the forward direction of the gas flow leads to an influence on the expansion structure. A pressure increase in front of the skimmer is formed and the flow of the plasma beam becomes obstructed. It has been shown that a skimmer with an angle around 53 deg. gives the best performance. The use of skimmers is implemented in the design of the large linear plasma generator Magnum-PSI. Here, a three stage differentially pumped vacuum system is used to reach low enough neutral pressures near the target, opening a door to PSI research in the ITER relevant regime.

  12. Energy 42 (2012) 486-496 Thermoeconomic operation optimization of a coal-fired power plant

    E-Print Network [OSTI]

    Luh, Peter

    2012-01-01T23:59:59.000Z

    optimization of a coal-fired power plant Jie Xiong a, Haibo Zhao a.*, Chao Zhang a, Chuguang Zheng a, Peter B optimization on a 300 MW coal-fired power plant located in Yiyang (Hunan Province, China) is accomplished based, are succes- sively realized on the power plant. Both strategies aim to minimize the total annual cost ofthe

  13. Optimal Technology Investment and Operation in Zero-Net-Energy Buildings with Demand Response

    SciTech Connect (OSTI)

    Stadler , Michael; Siddiqui, Afzal; Marnay, Chris; ,, Hirohisa Aki; Lai, Judy

    2009-05-26T23:59:59.000Z

    The US Department of Energy has launched the Zero-Net-Energy (ZNE) Commercial Building Initiative (CBI) in order to develop commercial buildings that produce as much energy as they use. Its objective is to make these buildings marketable by 2025 such that they minimize their energy use through cutting-edge energy-efficient technologies and meet their remaining energy needs through on-site renewable energy generation. We examine how such buildings may be implemented within the context of a cost- or carbon-minimizing microgrid that is able to adopt and operate various technologies, such as photovoltaic (PV) on-site generation, heat exchangers, solar thermal collectors, absorption chillers, and passive / demand-response technologies. We use a mixed-integer linear program (MILP) that has a multi-criteria objective function: the minimization of a weighted average of the building's annual energy costs and carbon / CO2 emissions. The MILP's constraints ensure energy balance and capacity limits. In addition, constraining the building's energy consumed to equal its energy exports enables us to explore how energy sales and demand-response measures may enable compliance with the CBI. Using a nursing home in northern California and New York with existing tariff rates and technology data, we find that a ZNE building requires ample PV capacity installed to ensure electricity sales during the day. This is complemented by investment in energy-efficient combined heat and power equipment, while occasional demand response shaves energy consumption. A large amount of storage is also adopted, which may be impractical. Nevertheless, it shows the nature of the solutions and costs necessary to achieve ZNE. For comparison, we analyze a nursing home facility in New York to examine the effects of a flatter tariff structure and different load profiles. It has trouble reaching ZNE status and its load reductions as well as efficiency measures need to be more effective than those in the CA case. Finally, we illustrate that the multi-criteria frontier that considers costs and carbon emissions in the presence of demand response dominates the one without it.

  14. Optimal Technology Investment and Operation in Zero-Net-Energy Buildings with Demand Response

    E-Print Network [OSTI]

    Stadler, Michael

    2009-01-01T23:59:59.000Z

    Operation in Zero-Net- Energy Buildings with Demand ResponseOperation in Zero-Net-Energy Buildings with Demand Responsemicrogrid, storage, zero- net energy buildings, zero-carbon

  15. Optimal Planning and Operation of Smart Grids with Electric Vehicle Interconnection

    E-Print Network [OSTI]

    Stadler, Michael

    2012-01-01T23:59:59.000Z

    Planning and Operation of Smart Grids with Electric VehiclePlanning and Operation of Smart Grids with Electric Vehicleenergy costs at the smart grid or commercial building due to

  16. Optimal Technology Investment and Operation in Zero-Net-Energy Buildings with Demand Response

    E-Print Network [OSTI]

    Stadler, Michael

    2009-01-01T23:59:59.000Z

    Golden, CO, USA. Electricity Storage Association, MorganUSA Figure 7. Optimal schedule for meeting the electricityUSA Figure 4. CA nursing home January and July weekday electricity

  17. Reducing Building Energy Costs Using Optimized Operation Strategies for Constant Volume Air Handling Systems

    E-Print Network [OSTI]

    Liu, M.; Athar, A.; Reddy, A.; Claridge, D. E.; Haberl, J. S.; White, E.

    1994-01-01T23:59:59.000Z

    , building energy consumption can be further reduced even after these traditional O&M measures are applied. This involves optimal adjusting of cold deck and hot deck settings according to the ambient temperature and organizing cold deck settings properly... where more than one cold deck is present (Extended O&M Measures). The cold deck and hot deck settings can be adjusted continuously by the Energy Management and Control Systems without additional investment. The optimized cold deck settings can...

  18. Review of Operational Water Consumption and Withdrawal Factors for Electricity Generating Technologies

    SciTech Connect (OSTI)

    Macknick, J.; Newmark, R.; Heath, G.; Hallett, K. C.

    2011-03-01T23:59:59.000Z

    Various studies have attempted to consolidate published estimates of water use impacts of electricity generating technologies, resulting in a wide range of technologies and values based on different primary sources of literature. The goal of this work is to consolidate the various primary literature estimates of water use during the generation of electricity by conventional and renewable electricity generating technologies in the United States to more completely convey the variability and uncertainty associated with water use in electricity generating technologies.

  19. Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation

    SciTech Connect (OSTI)

    Eto, Joseph H.; Undrill, John; Mackin, Peter; Daschmans, Ron; Williams, Ben; Haney, Brian; Hunt, Randall; Ellis, Jeff; Illian, Howard; Martinez, Carlos; O'Malley, Mark; Coughlin, Katie; LaCommare, Kristina Hamachi

    2010-12-20T23:59:59.000Z

    An interconnected electric power system is a complex system that must be operated within a safe frequency range in order to reliably maintain the instantaneous balance between generation and load. This is accomplished by ensuring that adequate resources are available to respond to expected and unexpected imbalances and restoring frequency to its scheduled value in order to ensure uninterrupted electric service to customers. Electrical systems must be flexible enough to reliably operate under a variety of"change" scenarios. System planners and operators must understand how other parts of the system change in response to the initial change, and need tools to manage such changes to ensure reliable operation within the scheduled frequency range. This report presents a systematic approach to identifying metrics that are useful for operating and planning a reliable system with increased amounts of variable renewable generation which builds on existing industry practices for frequency control after unexpected loss of a large amount of generation. The report introduces a set of metrics or tools for measuring the adequacy of frequency response within an interconnection. Based on the concept of the frequency nadir, these metrics take advantage of new information gathering and processing capabilities that system operators are developing for wide-area situational awareness. Primary frequency response is the leading metric that will be used by this report to assess the adequacy of primary frequency control reserves necessary to ensure reliable operation. It measures what is needed to arrest frequency decline (i.e., to establish frequency nadir) at a frequency higher than the highest set point for under-frequency load shedding within an interconnection. These metrics can be used to guide the reliable operation of an interconnection under changing circumstances.

  20. Start | Grid View | Browse by Day OR Group/Topical | Author Index | Keyword Index | Personal Scheduler Active Constraint Regions for Economically Optimal Operation of Distillation

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Scheduler Active Constraint Regions for Economically Optimal Operation of Distillation Columns Tuesday and operation of distillation columns has been widely studied, as illustrated by for example Skogestad (1993 operation of distillation columns has been studied relatively little. The issue of active constraints

  1. Optimizations enabling transformations and code generation for th HP V class

    E-Print Network [OSTI]

    Carvallo de Ochoa, Julio Antonio

    2000-01-01T23:59:59.000Z

    and unique issues involved in the implementation of the code generation back-end for the HP V class multiprocessor....

  2. Analysis of the Impact of Balancing Area Cooperation on the Operation of the Western Interconnection with Wind and Solar Generation (Presentation)

    SciTech Connect (OSTI)

    Milligan, M.; Lew, D.; Jordan, G.; Piwko, R.; Kirby, B.; King, J.; Beuning, S.

    2011-05-01T23:59:59.000Z

    This presentation describes the analysis of the impact of balancing area cooperation on the operation of the Western Interconnection with wind and solar generation, including a discussion of operating reserves, ramping, production simulation, and conclusions.

  3. A Study of Optimization of Reservoir Operations of the Colorado River

    E-Print Network [OSTI]

    been exactly repro- #12;iv duced. The equalization policy has not been matched completely of 6% in forecasted hydropower generation value are possible using reasonable amounts of flexibility. Because the annual value from the three hydropower generation locations in the Lower Basin of the Colorado

  4. Real-time Pricing Leading to Optimal Operation under Distributed Decision Makings

    E-Print Network [OSTI]

    Hespanha, João Pedro

    such as renewable, micro-combined heat and power systems as well as energy storage systems such as batteries and development on the future power grid in which small but variety and a huge number of distributed generators, since the legacy power grid is intended for delivering energy from centralized power generators

  5. Fuzzy logic controller optimization

    DOE Patents [OSTI]

    Sepe, Jr., Raymond B; Miller, John Michael

    2004-03-23T23:59:59.000Z

    A method is provided for optimizing a rotating induction machine system fuzzy logic controller. The fuzzy logic controller has at least one input and at least one output. Each input accepts a machine system operating parameter. Each output produces at least one machine system control parameter. The fuzzy logic controller generates each output based on at least one input and on fuzzy logic decision parameters. Optimization begins by obtaining a set of data relating each control parameter to at least one operating parameter for each machine operating region. A model is constructed for each machine operating region based on the machine operating region data obtained. The fuzzy logic controller is simulated with at least one created model in a feedback loop from a fuzzy logic output to a fuzzy logic input. Fuzzy logic decision parameters are optimized based on the simulation.

  6. Optimal operating conditions and configurations for humidification-dehumidification desalination cycles

    E-Print Network [OSTI]

    Lienhard V, John H.

    , each with either an air or a water heater, were considered in this analysis. Numerical optimization distillate) [kJ/kg] L length of heater [m] m mass flow rate [kg/s] mr mass flow rate ratio (feed water to dry that result in maximum gained output ratio (GOR). Closed air open water as well as open air open water cycles

  7. Optimal Transmission Switching in Electric Networks for Improved Economic Operations1

    E-Print Network [OSTI]

    Ferris, Michael C.

    . Abstract Growing demand for electric power seems to necessitate new transmission lines, but obstacles demand with existing infrastructure. In this paper we present the formulation for an Optimal Power Flow have been considered static infrastructure, a "superhighway" for power delivery. However, switching

  8. A Survey of Techniques Used to Control Microgrid Generation and Storage during Island Operation

    E-Print Network [OSTI]

    Michael Angelo Pedrasa

    A microgrid is a cluster of interconnected distributed generators, loads and intermediate storage units that cooperate with each other to be collectively treated by the grid as a controllable load or generator. Power quality events and pre-set conditions will make the microgrid disconnect from the

  9. Optimal suppression of defect generation during a passage across a quantum critical point

    E-Print Network [OSTI]

    Ning Wu; Arun Nanduri; Herschel Rabitz

    2014-12-09T23:59:59.000Z

    The dynamics of quantum phase transitions are inevitably accompanied by the formation of defects when crossing a quantum critical point. For a generic class of quantum critical systems, we solve the problem of minimizing the production of defects through the use of a gradient-based deterministic optimal control algorithm. By considering a finite size quantum Ising model with a tunable global transverse field, we show that an optimal power law quench of the transverse field across the Ising critical point works well at minimizing the number of defects, in spite of being drawn from a subset of quench profiles. These power law quenches are shown to be inherently robust against noise. The optimized defect density exhibits a transition at a critical ratio of the quench duration to the system size, which we argue coincides with the intrinsic speed limit for quantum evolution.

  10. Optimized Generation of Data-Path from C Codes for FPGAs

    E-Print Network [OSTI]

    Guo, Zhi; Najjar, Walid; Vissers, Kees

    2011-01-01T23:59:59.000Z

    FPGAs, as computing devices, offer significant speedup over microprocessors. Furthermore, their configurability offers an advantage over traditional ASICs. However, they do not yet enjoy high-level language programmability, as microprocessors do. This has become the main obstacle for their wider acceptance by application designers. ROCCC is a compiler designed to generate circuits from C source code to execute on FPGAs, more specifically on CSoCs. It generates RTL level HDLs from frequently executing kernels in an application. In this paper, we describe ROCCC's system overview and focus on its data path generation. We compare the performance of ROCCC-generated VHDL code with that of Xilinx IPs. The synthesis result shows that ROCCC-generated circuit takes around 2x ~ 3x area and runs at comparable clock rate.

  11. Optimization-based routing and scheduling of IED-detection assets in contemporary military operations

    E-Print Network [OSTI]

    Marks, Christopher E. (Christopher Edward)

    2009-01-01T23:59:59.000Z

    Improvised Explosive Devices, or IEDs, have become a familiar and lethal part of contemporary military operations in Iraq and Afghanistan, producing more casualties than any other weapons system. One reason for their success ...

  12. Predictive storm damage modeling and optimizing crew response to improve storm response operations

    E-Print Network [OSTI]

    Whipple, Sean David

    2014-01-01T23:59:59.000Z

    Utility infrastructures are constantly damaged by naturally occurring weather. Such damage results in customer service interruption and repairs are necessary to return the system to normal operation. In most cases these ...

  13. DeltaSky: Optimal Maintenance of Skyline Deletions without Exclusive Dominance Region Generation

    E-Print Network [OSTI]

    Egecioglu, Ã?mer

    of the so called exclusive dominance region (EDR) to achieve optimal I/O performance for deletion maintenance. However, the shape of an EDR becomes extremely complex in higher dimensions, and algorithms for its computation have not been developed. We derive a systematic way to decompose a d-dimensional EDR

  14. Distributed generation and demand side management : applications to transmission system operation 

    E-Print Network [OSTI]

    Hayes, Barry Patrick

    2013-07-01T23:59:59.000Z

    Electricity networks are undergoing a period of rapid change and transformation, with increased penetration levels of renewable-based distributed generation, and new influences on electricity end-use patterns from ...

  15. Micro-grid operation of inverter based distributed generation with voltage and frequency dependent loads

    E-Print Network [OSTI]

    Zeineldin, H. H.

    Distribution systems are experiencing increasing penetration of distributed generation (DG). One attractive option is to use the available DG capacity during utility outages by forming planned micro-grids. Load sharing ...

  16. Wind Energy Management System EMS Integration Project: Incorporating Wind Generation and Load Forecast Uncertainties into Power Grid Operations

    SciTech Connect (OSTI)

    Makarov, Yuri V.; Huang, Zhenyu; Etingov, Pavel V.; Ma, Jian; Guttromson, Ross T.; Subbarao, Krishnappa; Chakrabarti, Bhujanga B.

    2010-01-01T23:59:59.000Z

    The power system balancing process, which includes the scheduling, real time dispatch (load following) and regulation processes, is traditionally based on deterministic models. Since the conventional generation needs time to be committed and dispatched to a desired megawatt level, the scheduling and load following processes use load and wind and solar power production forecasts to achieve future balance between the conventional generation and energy storage on the one side, and system load, intermittent resources (such as wind and solar generation), and scheduled interchange on the other side. Although in real life the forecasting procedures imply some uncertainty around the load and wind/solar forecasts (caused by forecast errors), only their mean values are actually used in the generation dispatch and commitment procedures. Since the actual load and intermittent generation can deviate from their forecasts, it becomes increasingly unclear (especially, with the increasing penetration of renewable resources) whether the system would be actually able to meet the conventional generation requirements within the look-ahead horizon, what the additional balancing efforts would be needed as we get closer to the real time, and what additional costs would be incurred by those needs. To improve the system control performance characteristics, maintain system reliability, and minimize expenses related to the system balancing functions, it becomes necessary to incorporate the predicted uncertainty ranges into the scheduling, load following, and, in some extent, into the regulation processes. It is also important to address the uncertainty problem comprehensively by including all sources of uncertainty (load, intermittent generation, generators’ forced outages, etc.) into consideration. All aspects of uncertainty such as the imbalance size (which is the same as capacity needed to mitigate the imbalance) and generation ramping requirement must be taken into account. The latter unique features make this work a significant step forward toward the objective of incorporating of wind, solar, load, and other uncertainties into power system operations. Currently, uncertainties associated with wind and load forecasts, as well as uncertainties associated with random generator outages and unexpected disconnection of supply lines, are not taken into account in power grid operation. Thus, operators have little means to weigh the likelihood and magnitude of upcoming events of power imbalance. In this project, funded by the U.S. Department of Energy (DOE), a framework has been developed for incorporating uncertainties associated with wind and load forecast errors, unpredicted ramps, and forced generation disconnections into the energy management system (EMS) as well as generation dispatch and commitment applications. A new approach to evaluate the uncertainty ranges for the required generation performance envelope including balancing capacity, ramping capability, and ramp duration has been proposed. The approach includes three stages: forecast and actual data acquisition, statistical analysis of retrospective information, and prediction of future grid balancing requirements for specified time horizons and confidence levels. Assessment of the capacity and ramping requirements is performed using a specially developed probabilistic algorithm based on a histogram analysis, incorporating all sources of uncertainties of both continuous (wind and load forecast errors) and discrete (forced generator outages and start-up failures) nature. A new method called the “flying brick” technique has been developed to evaluate the look-ahead required generation performance envelope for the worst case scenario within a user-specified confidence level. A self-validation algorithm has been developed to validate the accuracy of the confidence intervals.

  17. Proceedings: EPRI Workshop on Improved Operational Flexibility: Making the Most of Generating Assets

    SciTech Connect (OSTI)

    None

    2004-07-01T23:59:59.000Z

    EPRI conducted the Workshop on Improved Operational Flexibility in October 2003. This report presents the Proceedings from that workshop. Within the Proceedings, each session is captured with the presenters' presentation slides.

  18. Incorporating operational flexibility into electric generation planning : impacts and methods for system design and policy analysis

    E-Print Network [OSTI]

    Palmintier, Bryan S. (Bryan Stephen)

    2013-01-01T23:59:59.000Z

    This dissertation demonstrates how flexibility in hourly electricity operations can impact long-term planning and analysis for future power systems, particularly those with substantial variable renewables (e.g., wind) or ...

  19. Operational behavior of a double-fed permanent magnet generator for wind turbines

    E-Print Network [OSTI]

    Reddy, Sivananda Kumjula

    2005-01-01T23:59:59.000Z

    Greater efficiency in wind turbine systems is achieved by allowing the rotor to change its rate of rotation as the wind speed changes. The wind turbine system is decoupled from the utility grid and a variable speed operation ...

  20. Particle Swarm Optimization Based Reactive Power Optimization

    E-Print Network [OSTI]

    Sujin, P R; Linda, M Mary

    2010-01-01T23:59:59.000Z

    Reactive power plays an important role in supporting the real power transfer by maintaining voltage stability and system reliability. It is a critical element for a transmission operator to ensure the reliability of an electric system while minimizing the cost associated with it. The traditional objectives of reactive power dispatch are focused on the technical side of reactive support such as minimization of transmission losses. Reactive power cost compensation to a generator is based on the incurred cost of its reactive power contribution less the cost of its obligation to support the active power delivery. In this paper an efficient Particle Swarm Optimization (PSO) based reactive power optimization approach is presented. The optimal reactive power dispatch problem is a nonlinear optimization problem with several constraints. The objective of the proposed PSO is to minimize the total support cost from generators and reactive compensators. It is achieved by maintaining the whole system power loss as minimum...

  1. Optimization of operating parameters for the Texas A&M Variable Energy Cyclotron

    E-Print Network [OSTI]

    Wolters, Richard Arthur

    1969-01-01T23:59:59.000Z

    for the degree of iViASTER OI" SCIENCE January I9G9 Major Subie& t: NUCLEAR ENGINEERING OPTIMIZATION OF PZBATIbi'C PARAMETERS I OR TF E TEXAS A@iVl VARIAI31 E ENEBCY CTC1. OTBON A Thesis by RICIIABD ART 'UB WOLTERS, J R. Approved as to slyle and cor tent... assistance throughout the course of this work; The AEC and the Cyclotron Institute I' or my assistantship so that I could continue my education in Nuclear Engineering; TAMVEC personnel for making the working atmosphere en- joyable; Dr, R, G. Cochran, Dr...

  2. Microsoft Word - Optimizes Assets Operates Efficiently_APPROVED_2009_09_09.docx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA / USACE LMI-EFRCAddendum 1April1 Page 1OPTIMIZES ASSET

  3. Smart grids are forcing the evolution of grid operational strategies. The variability inherent in large-scale renewable generation challenges existing regulation approaches.

    E-Print Network [OSTI]

    Hiskens, Ian A.

    stable, optimal operation. Wide Area Monitoring and Control (WAMC) Phasor measurement units (PMUs transformers (TCPSTs, phase angle differences), and unified power flow controllers (UPFCs, all of the aboveSmart grids are forcing the evolution of grid operational strategies. The variability inherent

  4. Commissioning, Operation, Real Time Monitoring and Evaluation of Pilot: Achieving Optimal Performance through Building Commissioning

    E-Print Network [OSTI]

    Pang,X.; Piette, M.A.; Hao,B.

    2014-01-01T23:59:59.000Z

    , Mary Ann Piette, Bin Hao Interface Engineering, PG&E, WattWise, CABR, Xingye Presented By Lawrence Berkeley National Laboratory November 11, 2014 ESL-IC-14-09-30 Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing...

  5. Monitoring and Optimization of Building Operations of a Low-Energy School Building 

    E-Print Network [OSTI]

    Koenigsdorff, R.; Heinrich, S.; Baumann, O.; Reiser, C.

    2008-01-01T23:59:59.000Z

    The ambitious design and energy concept of the new Gebhard-Müller-Schule (GMS) school building in Biberach/Riss, Germany proved itself during the first three school years of operation. The intended target value of 30 kWh/(m2a) overall heating energy...

  6. Optimal Operation of Finite-time Tricycles with Heat Conduction Losses Raj K. Pathria

    E-Print Network [OSTI]

    Salamon, Peter

    -principle limits to the finite-time operation of a cycling working fluid acting as an agent in the transfer of heat of Curzon and Ahlborn for the efficiency of a Carnot-like heat engine at maximu m power. PACS: 05.70.Ln, 05 means "internall y reversible" and allows us to treat the subsystems participating in a process as being

  7. Optimization of operating temperature in cryocooled HTS magnets for compactness and efficiency

    E-Print Network [OSTI]

    Chang, Ho-Myung

    . The magnet systems considered here are refrigerated by a closed-cycle cryocooler, and liquid cryogens may-cooled without any liquid (Fig. 1b). As the operating temperature of the magnet decreases, both the refrigeration load of the magnet and the required power per unit refrigeration at cryocooler increases dramati- cally

  8. Contacts to WTE operators in Austria using the Balance-Method to label the electricity generated

    E-Print Network [OSTI]

    Szmolyan, Peter

    of "Green" Energy and Fossil CO2 Emissions from WTE Plants Description The Balance-Method is based. Annual biogenic and fossil CO2 emissions from the WTE plant % "Fossil" CO2-emissions % Ratio of "green; - Difference between O2 consumption and CO2 production. The required operating data from the WTE plant

  9. Wind Energy Management System Integration Project Incorporating Wind Generation and Load Forecast Uncertainties into Power Grid Operations

    SciTech Connect (OSTI)

    Makarov, Yuri V.; Huang, Zhenyu; Etingov, Pavel V.; Ma, Jian; Guttromson, Ross T.; Subbarao, Krishnappa; Chakrabarti, Bhujanga B.

    2010-09-01T23:59:59.000Z

    The power system balancing process, which includes the scheduling, real time dispatch (load following) and regulation processes, is traditionally based on deterministic models. Since the conventional generation needs time to be committed and dispatched to a desired megawatt level, the scheduling and load following processes use load and wind power production forecasts to achieve future balance between the conventional generation and energy storage on the one side, and system load, intermittent resources (such as wind and solar generation) and scheduled interchange on the other side. Although in real life the forecasting procedures imply some uncertainty around the load and wind forecasts (caused by forecast errors), only their mean values are actually used in the generation dispatch and commitment procedures. Since the actual load and intermittent generation can deviate from their forecasts, it becomes increasingly unclear (especially, with the increasing penetration of renewable resources) whether the system would be actually able to meet the conventional generation requirements within the look-ahead horizon, what the additional balancing efforts would be needed as we get closer to the real time, and what additional costs would be incurred by those needs. In order to improve the system control performance characteristics, maintain system reliability, and minimize expenses related to the system balancing functions, it becomes necessary to incorporate the predicted uncertainty ranges into the scheduling, load following, and, in some extent, into the regulation processes. It is also important to address the uncertainty problem comprehensively, by including all sources of uncertainty (load, intermittent generation, generators’ forced outages, etc.) into consideration. All aspects of uncertainty such as the imbalance size (which is the same as capacity needed to mitigate the imbalance) and generation ramping requirement must be taken into account. The latter unique features make this work a significant step forward toward the objective of incorporating of wind, solar, load, and other uncertainties into power system operations. In this report, a new methodology to predict the uncertainty ranges for the required balancing capacity, ramping capability and ramp duration is presented. Uncertainties created by system load forecast errors, wind and solar forecast errors, generation forced outages are taken into account. The uncertainty ranges are evaluated for different confidence levels of having the actual generation requirements within the corresponding limits. The methodology helps to identify system balancing reserve requirement based on a desired system performance levels, identify system “breaking points”, where the generation system becomes unable to follow the generation requirement curve with the user-specified probability level, and determine the time remaining to these potential events. The approach includes three stages: statistical and actual data acquisition, statistical analysis of retrospective information, and prediction of future grid balancing requirements for specified time horizons and confidence intervals. Assessment of the capacity and ramping requirements is performed using a specially developed probabilistic algorithm based on a histogram analysis incorporating all sources of uncertainty and parameters of a continuous (wind forecast and load forecast errors) and discrete (forced generator outages and failures to start up) nature. Preliminary simulations using California Independent System Operator (California ISO) real life data have shown the effectiveness of the proposed approach. A tool developed based on the new methodology described in this report will be integrated with the California ISO systems. Contractual work is currently in place to integrate the tool with the AREVA EMS system.

  10. Appeared in Proceedings of First International ACM/IEEE Symposium on Code Generation and Optimization, 2003 Optimizing Memory Accesses For Spatial Computation

    E-Print Network [OSTI]

    Budiu, Mihai

    many efficient and powerful optimizations it cannot be easily applied in the presence of pointers and Optimization, 2003 Optimizing Memory Accesses For Spatial Computation Mihai Budiu and Seth C. Goldstein present the internal representation and optimizations used by the CASH compiler for improving the memory

  11. Subtask 1.24 - Optimization of Cooling Water Resources for Power Generation

    SciTech Connect (OSTI)

    Daniel Stepan; Richard Shockey; Bethany Kurz; Wesley Peck

    2009-03-31T23:59:59.000Z

    The Energy & Environmental Research Center (EERC) has developed an interactive, Web-based decision support system (DSS{copyright} 2007 EERC Foundation) to provide power generation utilities with an assessment tool to address water supply issues when planning new or modifying existing generation facilities. The Web-based DSS integrates water and wastewater treatment technology and water law information with a geographic information system-based interactive map that links to state and federal water quality and quantity databases for North Dakota, South Dakota, Minnesota, Wyoming, Montana, Nebraska, Wisconsin, and Iowa.

  12. Circuit model optimization of a nano split ring resonator dimer antenna operating in infrared spectral range

    SciTech Connect (OSTI)

    Gneiding, N., E-mail: Natalia.Gneiding@physik.uni-erlangen.de [Erlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg, 91052 Erlangen (Germany); Zhuromskyy, O.; Peschel, U. [Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, 91058 Erlangen (Germany); Shamonina, E. [Department of Engineering Science, University of Oxford, Parks Road, OX1 3PJ Oxford (United Kingdom)

    2014-10-28T23:59:59.000Z

    Metamaterials are comprised of metallic structures with a strong response to incident electromagnetic radiation, like, for example, split ring resonators. The interaction of resonator ensembles with electromagnetic waves can be simulated with finite difference or finite elements algorithms, however, above a certain ensemble size simulations become inadmissibly time or memory consuming. Alternatively a circuit description of metamaterials, a well developed modelling tool at radio and microwave frequencies, allows to significantly increase the simulated ensemble size. This approach can be extended to the IR spectral range with an appropriate set of circuit element parameters accounting for physical effects such as electron inertia and finite conductivity. The model is verified by comparing the coupling coefficients with the ones obtained from the full wave numerical simulations, and used to optimize the nano-antenna design with improved radiation characteristics.

  13. The Optimizing Control and Energy Saving Operations of One Teaching Building

    E-Print Network [OSTI]

    Lu, J.; Chen, Y.; Chen, J.

    2006-01-01T23:59:59.000Z

    : cold source; energy-saving operation; number control; water temperature control 1. FOREWORD With the fast development of economy and technology, it becomes more and more popular for the public buildings to adopt the central air conditioning... systems. This phenomenon causes the sharp increase of the energy consumption on air conditioning systems, which accounts for 50% of the total energy consumption of buildings[1]. In addition, the energy consumption of the cold source system...

  14. A Virtual Reality Framework to Optimize Design, Operation and Refueling of GEN-IV Reactors.

    SciTech Connect (OSTI)

    Rizwan-uddin; Nick Karancevic; Stefano Markidis; Joel Dixon; Cheng Luo; Jared Reynolds

    2008-04-23T23:59:59.000Z

    many GEN-IV candidate designs are currently under investigation. Technical issues related to material, safety and economics are being addressed at research laboratories, industry and in academia. After safety, economic feasibility is likely to be the most important crterion in the success of GEN-IV design(s). Lessons learned from the designers and operators of GEN-II (and GEN-III) reactors must play a vital role in achieving both safety and economic feasibility goals.

  15. Optimization of a Microscale, Axial-Flux, Permanent-Magnet Generator D. P. Arnold1*

    E-Print Network [OSTI]

    -phase, axial- flux, PM machine, consisting of a stator with Cu surface windings and a multi-pole SmCo PM rotor of the overall machine geometry and stator winding patterns. 2. MACHINE OVERVIEW The generator is a three back iron and a stator with Cu surface windings on a magnetically soft substrate, which serves

  16. Optimal sizing study of hybrid wind/PV/diesel power generation unit

    SciTech Connect (OSTI)

    Belfkira, Rachid; Zhang, Lu; Barakat, Georges [Groupe de Recherche en Electrotechnique et Automatique du Havre, University of Le Havre, 25 rue Philippe Lebon, BP 1123, 76063 Le Havre (France)

    2011-01-15T23:59:59.000Z

    In this paper, a methodology of sizing optimization of a stand-alone hybrid wind/PV/diesel energy system is presented. This approach makes use of a deterministic algorithm to suggest, among a list of commercially available system devices, the optimal number and type of units ensuring that the total cost of the system is minimized while guaranteeing the availability of the energy. The collection of 6 months of data of wind speed, solar radiation and ambient temperature recorded for every hour of the day were used. The mathematical modeling of the main elements of the hybrid wind/PV/diesel system is exposed showing the more relevant sizing variables. A deterministic algorithm is used to minimize the total cost of the system while guaranteeing the satisfaction of the load demand. A comparison between the total cost of the hybrid wind/PV/diesel energy system with batteries and the hybrid wind/PV/diesel energy system without batteries is presented. The reached results demonstrate the practical utility of the used sizing methodology and show the influence of the battery storage on the total cost of the hybrid system. (author)

  17. Design and optimization of a bi-axial vibration-driven electromagnetic generator

    SciTech Connect (OSTI)

    Yang, Jin, E-mail: yangjin@cqu.edu.cn; Yu, Qiangmo; Zhao, Jiangxin; Zhao, Nian; Wen, Yumei; Li, Ping; Qiu, Jing [Department of Optoelectronic Engineering, Research Center of Sensors and Instruments, Chongqing University, Chongqing 400044 (China)

    2014-09-21T23:59:59.000Z

    To scavenge energy from ambient vibrations with arbitrary in-plane motion directions and over a wide frequency range, a novel electromagnetic vibration energy harvester is designed and optimized. In the harvester, a circular cross-section elastic rod, not a traditional thin cantilever beam, is used to extract ambient vibration energy because of its capability to collect vibration from arbitrary in-plane motion directions. The magnetic interaction between magnets and the iron core contributes to a nonlinear oscillation of the rod with increased frequency bandwidth. The influences of the structure configurations on the electrical output and the working bandwidth of the harvester are investigated using Ansoft's Maxwell 3D to achieve optimal performance. The experimental results show that the harvester is sensitive to vibrations from arbitrary in-plane directions and it exhibits a bandwidth of 5.7 Hz and a maximum power of 13.4 mW at an acceleration of 0.6 g (with g=9.8 ms?²).

  18. Operable Generating Units in the United States by State and Energy Source, 2011

    U.S. Energy Information Administration (EIA) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro IndustriesTownDells,1Stocks Nov-14 Dec-14 Jan-15LiquidBGOperable Generating Units in the

  19. Operating Reserve Reductions from a Proposed Energy Imbalance Market with Wind and Solar Generation in the Western Interconnection

    SciTech Connect (OSTI)

    King, J.; Kirby, B.; Milligan, M.; Beuning, S.

    2012-05-01T23:59:59.000Z

    This paper considers several alternative forms of an energy imbalance market (EIM) proposed in the nonmarket areas of the Western Interconnection. The proposed EIM includes two changes in operating practices that independently reduce variability and increase access to responsive resources: balancing authority cooperation and sub-hourly dispatch. As the penetration of variable generation increases on the power system, additional interest in coordination would likely occur. Several alternative approaches could be used, but consideration of any form of coordinated unit commitment is beyond the scope of this analysis. This report examines the benefits of several possible EIM implementations--both separately and in concert.

  20. Analysis of viscoelastic soft dielectric elastomer generators operating in an electrical circuit

    E-Print Network [OSTI]

    Eliana Bortot; Ralf Denzer; Andreas Menzel; Massimiliano Gei

    2014-11-13T23:59:59.000Z

    A predicting model for soft Dielectric Elastomer Generators (DEGs) must consider a realistic model of the electromechanical behaviour of the elastomer filling, the variable capacitor and of the electrical circuit connecting all elements of the device. In this paper such an objective is achieved by proposing a complete framework for reliable simulations of soft energy harvesters. In particular, a simple electrical circuit is realised by connecting the capacitor, stretched periodically by a source of mechanical work, in parallel with a battery through a diode and with an electrical load consuming the energy produced. The electrical model comprises resistances simulating the effect of the electrodes and of the conductivity current invariably present through the dielectric film. As these devices undergo a high number of electro-mechanical loading cycles at large deformation, the time-dependent response of the material must be taken into account as it strongly affects the generator outcome. To this end, the viscoelastic behaviour of the polymer and the possible change of permittivity with strains are analysed carefully by means of a proposed coupled electro-viscoelastic constitutive model, calibrated on experimental data available in the literature for an incompressible polyacrilate elastomer (3M VHB4910). Numerical results showing the importance of time-dependent behaviour on the evaluation of performance of DEGs for different loading conditions, namely equi-biaxial and uniaxial, are reported in the final section.

  1. A Comparative Study of Modular Axial Flux Podded Generators for Marine Current Turbines

    E-Print Network [OSTI]

    Brest, Université de

    A Comparative Study of Modular Axial Flux Podded Generators for Marine Current Turbines Sofiane turbines (MCTs). Due to the submarine environment, maintenance operations are very hard, very costly current turbine, axial flux permanent magnet generator, design, optimization. Nomenclature MCT = Marine

  2. Optimization of Operating Parameters for Minimum Mechanical Specific Energy in Drilling

    SciTech Connect (OSTI)

    Hamrick, Todd

    2011-05-25T23:59:59.000Z

    Efficiency in drilling is measured by Mechanical Specific Energy (MSE). MSE is the measure of the amount of energy input required to remove a unit volume of rock, expressed in units of energy input divided by volume removed. It can be expressed mathematically in terms of controllable parameters; Weight on Bit, Torque, Rate of Penetration, and RPM. It is well documented that minimizing MSE by optimizing controllable factors results in maximum Rate of Penetration. Current methods for computing MSE make it possible to minimize MSE in the field only through a trial-and-error process. This work makes it possible to compute the optimum drilling parameters that result in minimum MSE. The parameters that have been traditionally used to compute MSE are interdependent. Mathematical relationships between the parameters were established, and the conventional MSE equation was rewritten in terms of a single parameter, Weight on Bit, establishing a form that can be minimized mathematically. Once the optimum Weight on Bit was determined, the interdependent relationship that Weight on Bit has with Torque and Penetration per Revolution was used to determine optimum values for those parameters for a given drilling situation. The improved method was validated through laboratory experimentation and analysis of published data. Two rock types were subjected to four treatments each, and drilled in a controlled laboratory environment. The method was applied in each case, and the optimum parameters for minimum MSE were computed. The method demonstrated an accurate means to determine optimum drilling parameters of Weight on Bit, Torque, and Penetration per Revolution. A unique application of micro-cracking is also presented, which demonstrates that rock failure ahead of the bit is related to axial force more than to rotation speed.

  3. Monitoring equipment environment during nuclear plant operation at Salem and Hope Creek generating stations

    SciTech Connect (OSTI)

    Blum, A.; Smith, R.J. [Public Service Electric and Gas Co., Hancocks Bridge, NJ (United States)

    1991-06-01T23:59:59.000Z

    Monitoring of environmental parameters has become a significant issue for operating nuclear power plants. While the long-term benefits of plant life extension programs are being pursued with comprehensive environmental monitoring programs, the potential effect of local hot spots at various plant locations needs to be evaluated for its effect on equipment degradation and shortening of equipment qualified life. A significant benefit can be experienced from temperature monitoring when a margin exists between the design versus actual operating temperature. This margin can be translated into longer equipment qualified life and significant reduction in maintenance activities. At PSE and G, the immediate need for monitoring environmental parameters is being accomplished via the use of a Logic Beach Bitlogger. The Bitlogger is a portable data loggings system consisting of a system base, input modules and a communication software package. Thermocouples are installed on selected electrical equipment and cables are run from the thermocouples to the input module of the Bitlogger. Temperature readings are taken at selected intervals, stored in memory, and downloaded periodically to a PC software program, i.e., Lotus. The data is formatted into tabular or graphical documents. Because of their versatility, Bitloggers are being used differently at the authors Nuclear facility. At the Salem Station (2 Units-4 loop Westinghouse PWR), a battery powered, fully portable, calibrated Bitlogger is located in an accessible area inside Containment where it monitors the temperature of various electrical equipment within the Pressurizer Enclosure. It is planned that close monitoring of the local hot spot temperatures in this area will allow them to adjust and reconcile the environmental qualification of the equipment.

  4. Electrical power obtained from burning landfill gas into a gas turbine generator: Experience after one year of operation

    SciTech Connect (OSTI)

    Fabbri, R.; Mignani, N.

    1998-07-01T23:59:59.000Z

    A typical example of a ``waste to energy'' concept can be found also in the landfill environment. The biogas derived by fermentation process is usually burnt into gas engines. This choice is usually due to the electric efficiency that is normally higher than gas turbine application and to the size that usually, almost in Italian landfill size, does not allow power higher than 1,000 kW. On the other side gas turbine applications, typically based on generator sets greater than 1,000 kW do not require special biogas pre-treatment; require less maintenance and have an extremely higher reliability. The paper describes an application of a gas turbine generator of 4,800 kW outlining the experiences collected after one year of operation. During this period, the system fulfilled the target of a total operating time greater than 8,000 hours. Description is done of the biogas compression system feeding the turbine and also of the subsystem adopted to reach the above mentioned target reliability.

  5. Measure Guideline: Condensing Boilers - Optimizing Efficiency and Response Time During Setback Operation

    SciTech Connect (OSTI)

    Arena, L.

    2014-02-01T23:59:59.000Z

    Conventional wisdom surrounding space heating has told us a couple of things consistently for several years now: size the mechanical systems to the heating loads and setting the thermostat back at night will result in energy savings. The problem is these two recommendations oppose each other. A system that is properly sized to the heating load will not have the extra capacity necessary to recover from a thermostat setback, especially at design conditions. The implication of this is that, for setback to be successfully implemented, the heating system must be oversized. This issue is exacerbated further when an outdoor reset control is used with a condensing boiler, because not only is the system matched to the load at design, the outdoor reset control matches the output to the load under varying outdoor temperatures. Under these circumstances, the home may never recover from setback. Special controls to bypass the outdoor reset sensor are then needed. Properly designing a hydronic system for setback operation can be accomplished but depends on several factors. Determining the appropriateness of setback for a particular project is the first step. This is followed by proper sizing of the boiler and baseboard to ensure the needed capacity can be met. Finally, control settings must be chosen that result in the most efficient and responsive performance. This guide provides step by step instructions for heating contractors and hydronic designers for selecting the proper control settings to maximize system performance and improve response time when using a thermostat setback.

  6. The Use of Exhaust Gas Recirculation to Optimize Fuel Economy and Minimize Emission in Engines Operating on E85 Fuel

    SciTech Connect (OSTI)

    Wu, Ko-Jen

    2011-12-31T23:59:59.000Z

    This report summarizes activities conducted for the project “The Use of Exhaust Gas Recirculation to Optimized Fuel Economy and Minimize Emissions in Engines Operating on E85 Fuel” under COOPERATIVE AGREEMENT NUMBER DE-FC26-07NT43271, which are as outlined in the STATEMENT OF PROJECT OBJECTIVES (SOPO) dated March 2007 and in the supplemental SOPO dated October 2010. The project objective was to develop and demonstrate an internal combustion engine that is optimized for E85 (85% ethanol and 15% gasoline) fuel operation to achieve substantially improved fuel economy while operating with E85 fuel and that is also production viable in the near- to medium-term. The key engine technology selected for research and development was turbocharging, which is known to improve fuel economy thru downsizing and is in particular capable of exploiting ethanol fuel’s characteristics of high octane number and high latent heat of vaporization. The engine further integrated synergistic efficiency improving technologies of cooled exhaust gas recirculation (EGR), direct fuel injection and dual continuously variable intake and exhaust cam phasers. On the vehicle level, fuel economy was furthered thru powertrain system optimization by mating a state-of-the-art six-speed automatic transmission to the engine. In order to achieve the project’s objective of near- to medium-term production viability, it was essential to develop the engine to be flex-fuel capable of operating with fuels ranging from E0 (0% ethanol and 100% gasoline) to E85 and to use three-way type of catalyst technology for exhaust aftertreatment. Within these scopes, various technologies were developed through systems approach to focus on ways to help accelerate catalyst light-off. Significant amount of development took place during the course of the project within General Motors, LLC. Many prototype flex-fuel engines were designed, built and developed with various hardware configurations selected to achieve the project goals. Several flex-fuel demonstration vehicles were designed and built for carrying out calibration development and final testing to quantify the technology merits. Based on the extensive test results collected from dynamometer and vehicle testing, the fuel economy benefits of cooled EGR from the intended level of turbocharger technology were quantified. When combined with turbo downsizing, the FE benefits are considered large enough for E0 fuel as well as for E85 fuel to warrant further development of the technology beyond the current proof-of-concept level to a level that can meet production driveability quality and durability requirements in order to meet customers’ expectations. Cold-start cart test results from the emissions segment of the project were positive, confirming the assumption of faster thermal response of turbo exhaust system for emissions reductions for both E0 and E85 fuels. Vehicle emissions test results directionally correlated to the cold-start cart findings. The limited number of test runs did demonstrate the potentials of meeting stringent emission standards, however, they did not comprehend the factors such as hardware variability and long-term durability, 3 which are essential for mass production to satisfy customers’ expectations. It is therefore recommended, moving forward, durability concerns over turbocharger, EGR system and aftertreatment system, which would likely impact production viability, should be addressed. The data moreover suggested that further FE increase is likely with turbocharger technology advancement.

  7. ASCO steam generators operating experience. Safety criteria for defect management and effectiveness of preventive measures

    SciTech Connect (OSTI)

    Toribio, E.L. [Associacion Nuclear Asco AIE, Barcelona (Spain)

    1997-02-01T23:59:59.000Z

    ASCO NPP is a two W-PWR 930 Mwe Units. Each Unit is provided with three Westinghouse Model D3 steam generators which are of preheater type and Inconel 600 MA as tube material. The Secondary side was designed and erected with copper alloys. Unit I: 81.072 EFPH, and Unit II: 69.720 EFPH. The results of the Eddy Currents Inspections performed during the first refueling outage showed Denting at tube support plates and PWSCC at roll transition zone in Unit I and Denting in Unit II. Later inspections showed other types of damages, such as: (1) ODSCC at tube support plates intersections. (2) Circumferential cracks OD and ID at roll transition zone. (3) Wear at antivibration bars and preheater baffles level. Consequently, in order to limit the plugging rate, A.N. ASCO decided to license new plugging criteria in addition to the 40% depth criterion included in Technical Specification. The new licensing criteria and surveillance requirements, varying with tube zone, are explained in the paper.

  8. Efficient generation and optimization of stochastic template banks by a neighboring cell algorithm

    E-Print Network [OSTI]

    Henning Fehrmann; Holger J. Pletsch

    2014-11-17T23:59:59.000Z

    Placing signal templates (grid points) as efficiently as possible to cover a multi-dimensional parameter space is crucial in computing-intensive matched-filtering searches for gravitational waves, but also in similar searches in other fields of astronomy. To generate efficient coverings of arbitrary parameter spaces, stochastic template banks have been advocated, where templates are placed at random while rejecting those too close to others. However, in this simple scheme, for each new random point its distance to every template in the existing bank is computed. This rapidly increasing number of distance computations can render the acceptance of new templates computationally prohibitive, particularly for wide parameter spaces or in large dimensions. This work presents a neighboring cell algorithm that can dramatically improve the efficiency of constructing a stochastic template bank. By dividing the parameter space into sub-volumes (cells), for an arbitrary point an efficient hashing technique is exploited to obtain the index of its enclosing cell along with the parameters of its neighboring templates. Hence only distances to these neighboring templates in the bank are computed, massively lowering the overall computing cost, as demonstrated in simple examples. Furthermore, we propose a novel method based on this technique to increase the fraction of covered parameter space solely by directed template shifts, without adding any templates. As is demonstrated in examples, this method can be highly effective..

  9. Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation

    E-Print Network [OSTI]

    Eto, Joseph H.

    2011-01-01T23:59:59.000Z

    of the Impact of Wind Generation on System Frequency2008. Analysis of Wind Generation Impact on ERCOT Ancillarywith Increased Wind Generation. LBNL-XXXX. Berkeley:

  10. Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation

    E-Print Network [OSTI]

    Eto, Joseph H.

    2011-01-01T23:59:59.000Z

    of Variable Renewable Generation The report is accompaniedit Relates to Wind-Powered Generation. LBNL-XXXX. Berkeley:with Increased Wind Generation. LBNL-XXXX. Berkeley:

  11. Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation

    E-Print Network [OSTI]

    Eto, Joseph H.

    2011-01-01T23:59:59.000Z

    North America Dynamic Wind Generator Modeling Update, Basedperformed by the WECC Wind Generator Modeling Group and theand in particular, wind generators are the primary resources

  12. Photovoltaic solar system connected to the electric power grid operating as active power generator and reactive power compensator

    SciTech Connect (OSTI)

    Albuquerque, Fabio L.; Moraes, Adelio J.; Guimaraes, Geraldo C.; Sanhueza, Sergio M.R.; Vaz, Alexandre R. [Universidade Federal de Uberlandia, Uberlandia-MG, CEP 38400-902 (Brazil)

    2010-07-15T23:59:59.000Z

    In the case of photovoltaic (PV) systems acting as distributed generation (DG) systems, the DC energy that is produced is fed to the grid through the power-conditioning unit (inverter). The majority of contemporary inverters used in DG systems are current source inverters (CSI) operating at unity power factor. If, however, we assume that voltage source inverters (VSI) can replace CSIs, we can generate reactive power proportionally to the remaining unused capacity at any given time. According to the theory of instantaneous power, the inverter reactive power can be regulated by changing the amplitude of its output voltage. In addition, the inverter active power can be adjusted by modifying the phase angle of its output voltage. Based on such theory, both the active power supply and the reactive power compensation (RPC) can be carried out simultaneously. When the insolation is weak or the PV modules are inoperative at night, the RPC feature of a PV system can still be used to improve the inverter utilisation factor. Some MATLAB simulation results are included here to show the feasibility of the method. (author)

  13. Development of Optimal Catalyst Designs and Operating Strategies for Lean NOx Reduction in Coupled LNT-SCR Systems

    SciTech Connect (OSTI)

    Harold, Michael; Crocker, Mark; Balakotaiah, Vemuri; Luss, Dan; Choi, Jae-Soon; Dearth, Mark; McCabe, Bob; Theis, Joe

    2013-09-30T23:59:59.000Z

    Oxides of nitrogen in the form of nitric oxide (NO) and nitrogen dioxide (NO{sub 2}) commonly referred to as NO{sub x}, is one of the two chemical precursors that lead to ground-level ozone, a ubiquitous air pollutant in urban areas. A major source of NO{sub x} is generated by equipment and vehicles powered by diesel engines, which have a combustion exhaust that contains NO{sub x} in the presence of excess O{sub 2}. Catalytic abatement measures that are effective for gasoline-fueled engines such as the precious metal containing three-way catalytic converter (TWC) cannot be used to treat O2-laden exhaust containing NO{sub x}. Two catalytic technologies that have emerged as effective for NO{sub x} abatement are NO{sub x} storage and reduction (NSR) and selective catalytic reduction (SCR). NSR is similar to TWC but requires much larger quantities of expensive precious metals and sophisticated periodic switching operation, while SCR requires an on-board source of ammonia which serves as the chemical reductant of the NO{sub x}. The fact that NSR produces ammonia as a byproduct while SCR requires ammonia to work has led to interest in combining the two together to avoid the need for the cumbersome ammonia generation system. In this project a comprehensive study was carried out of the fundamental aspects and application feasibility of combined NSR/SCR. The project team, which included university, industry, and national lab researchers, investigated the kinetics and mechanistic features of the underlying chemistry in the lean NOx trap (LNT) wherein NSR was carried out, with particular focus on identifying the operating conditions such as temperature and catalytic properties which lead to the production of ammonia in the LNT. The performance features of SCR on both model and commercial catalysts focused on the synergy between the LNT and SCR converters in terms of utilizing the upstream-generated ammonia and alternative reductants such as propylene, representing the hydrocarbon component of diesel exhaust. First-principle models of the LNT and SCR converters, which utilized the mechanistic-based kinetics and realistic treatments of the flow and transport processes, in combination with bench-scale reactor experiments helped to identify the best designs for combining the NSR and SCR catalysts over a range of operating conditions encountered in practice. This included catalysts having multiple zones and layers and additives with the focus on determining the minimal precious metal component needed to meet emission abatement targets over a wide range of operating conditions. The findings from this study provide diesel vehicle and catalyst companies valuable information to develop more cost effective diesel emissions catalysts which helps to expand the use of more fuel efficient diesel power. The fundamental modeling and experimental tools and findings from this project can be applied to catalyst technologies used in the energy and chemical industries. Finally, the project also led to training of several doctoral students who were placed in research jobs in industry and academia.

  14. Tone signal generator for producing multioperator tone signals using an operator circuit including a waveform generator, a selector and an enveloper

    DOE Patents [OSTI]

    Dong, Q.; Jenkins, M.V.; Bernadas, S.R.

    1997-09-09T23:59:59.000Z

    A frequency modulation (FM) tone signal generator for generating a FM tone signal is disclosed. The tone signal generator includes a waveform generator having a plurality of wave tables, a selector and an enveloper. The waveform generator furnishes a waveform signal in response to a phase angle address signal. Each wave table stores a different waveform. The selector selects one of the wave tables in response to a plurality of selection signals such that the selected wave table largely provides the waveform signal upon being addressed largely by the phase angle address signal. Selection of the selected wave table varies with each selection signal. The enveloper impresses an envelope signal on the waveform signal. The envelope signal is used as a carrier or modulator for generating the FM tone signal. 17 figs.

  15. DOE Backup Power Working Group Best Practices Handbook for Maintenance and Operation of Engine Generators, Volume II

    SciTech Connect (OSTI)

    Gross, R.E.

    1998-10-30T23:59:59.000Z

    The lubricating oil system provides a means to introduce a lubricant in the form of a film to reduce friction and wear between surfaces that bear against each other as they move.1 The oil film which is established also cools the parts by carrying generated heat away from hot surfaces, cleans and carries dirt or metal wear particles to the filter media, and helps seal the piston to the cylinder during combustion. Most systems are pressure lubricated and distribute oil under pressure to bearings, gears, and power assemblies. Lubricating oil usually reaches main, connecting rod, and camshaft bearings through drilled passages in the cylinder block and crankshaft or through piping and common manifolds.Many parts rely on oil for cooling, so if the lube oil system fails to perform its function the engine will overheat. Metal to metal surfaces not separated by a thin film of oil rapidly build up frictional heat. As the metals reach their melting point, they tend to weld together in spots or streaks. Lube oil system failures can cause significant damage to an engine in a short period of time. Proper maintenance and operation of the lubricating oil system is essential if your engine is to accomplish its mission.

  16. ASSESSMENT OF THE POTENTIAL FOR HYDROGEN GENERATION DURING GROUTING OPERATIONS IN THE R- AND P-REACTOR VESSELS

    SciTech Connect (OSTI)

    Wiersma, B.

    2009-12-29T23:59:59.000Z

    The R- and P-reactor buildings were retired from service and are now being prepared for deactivation and decommissioning (D&D). D&D activities will consist primarily of immobilizing contaminated components and structures in a grout-like formulation. Aluminum corrodes very rapidly when it comes in contact with the alkaline grout materials and as a result produces hydrogen gas. To address this potential deflagration/explosion hazard, the Materials Science and Technology Directorate (MS&T) of the Savannah River National Laboratory (SRNL) has been requested to review and evaluate existing experimental and analytical studies of this issue to determine if any process constraints on the chemistry of the fill material and the fill operation are necessary. Various options exist for the type of grout material that may be used for D&D of the reactor vessels. The grout formulation options include ceramicrete (pH 6-8), low pH portland cement + silica fume grout (pH 10.4), or Portland cement grout (pH 12.5). The assessment concluded that either ceramicrete or the silica fume grout may be used to safely grout the P-reactor vessel. The risk of accumulation of a flammable mixture of hydrogen between the grout-air interface and the top of the reactor is very low. Portland cement grout, on the other hand, for the same range of process parameters does not provide a significant margin of safety against the accumulation of flammable gas in the reactor vessel during grouting operations in the P-reactor vessel. It is recommended that this grout not be utilized for this task. The R-reactor vessel contains significantly less aluminum and thus a Portland cement grout may be considered as well. For example, if the grout fill rate is less than 1 inch/min and the grout temperature is maintained at 70 C or less, the risk of hydrogen accumulation in the R-reactor vessel is very low for the Portland cement. Alternatively, if the grout fill rate is less than 0.5 inch/min and the grout is maintained at a temperature of 80 C, the risk will again be very low. Although these calculations are conservative, there are some measures that may be taken to further minimize the potential for hydrogen evolution. (1) Minimize the temperature of the grout as much as practical. Lower temperatures will mean lower hydrogen generation rates. For P-reactor, grout temperatures less than 100 C should provide an adequate safety margin for the pH 8 and pH 10.4 grout formulations. For R-reactor, grout temperatures less than 70 C or 80 C will provide an adequate safety margin for the Portland cement. The other grout formulations are also viable options for R-reactor. (2) Minimize the grout fill rate as much as practical. Lowering the fill rate takes advantage of passivation of the aluminum components and hence lower hydrogen generation rates. For P-reactor, fill rates that are less than 2 inches/min for the ceramicrete and the silica fume grouts will reduce the chance of significant hydrogen accumulation. For R-reactor, fill rates less than 1 inch/min will again minimize the risk of hydrogen accumulation. (3) Ventilate the building as much as practical (e.g., leave doors open) to further disperse hydrogen. The volumetric hydrogen generation rates in the P-reactor vessel, however, are low for the pH 8 and pH 10.4 grout, (i.e., less than 0.32 ft{sup 3}/min). If further walk-down inspections of the reactor vessels suggest an increase in the actual areal density of aluminum, the calculations should be re-visited.

  17. ASSESSMENT OF THE POTENTIAL FOR HYDROGEN GENERATION DURING GROUTING OPERATIONS IN THE R AND P REACTOR VESSELS

    SciTech Connect (OSTI)

    Wiersma, B.

    2009-10-29T23:59:59.000Z

    The R- and P-reactor buildings were retired from service and are now being prepared for deactivation and decommissioning (D&D). D&D activities will consist primarily of immobilizing contaminated components and structures in a grout-like formulation. Aluminum corrodes very rapidly when it comes in contact with the alkaline grout materials and as a result produces hydrogen gas. To address this potential deflagration/explosion hazard, the Materials Science and Technology Directorate (MS&T) of the Savannah River National Laboratory (SRNL) has been requested to review and evaluate existing experimental and analytical studies of this issue to determine if any process constraints on the chemistry of the fill material and the fill operation are necessary. Various options exist for the type of grout material that may be used for D&D of the reactor vessels. The grout formulation options include ceramicrete (pH 6-8), low pH portland cement + silica fume grout (pH 10.4), or portland cement grout (pH 12.5). The assessment concluded that either ceramicrete or the silica fume grout may be used to safely grout the R- and P- reactor vessels. The risk of accumulation of a flammable mixture of hydrogen between the grout-air interface and the top of the reactor is very low. Conservative calculations estimate that either ceramicrete or the silica fume grout may be used to safely grout the R- and P- reactor vessels. The risk of accumulation of a flammable mixture of hydrogen between the grout-air interface and the top of the reactor is very low. Although these calculations are conservative, there are some measures that may be taken to further minimize the potential for hydrogen evolution. (1) Minimize the temperature of the grout as much as practical. Lower temperatures will mean lower hydrogen generation rates. Grout temperatures less than 100 C should however, still provide an adequate safety margin for the pH 8 and pH 10.4 grout formulations. (2) Minimize the fill rate as much as practical. Lowering the fill rate takes advantage of passivation of the aluminum components and hence lower hydrogen generation rates. Fill rates that are less than 2 inches/min will reduce the chance of significant hydrogen build-up. (3) Ventilate the building as much as practical (e.g., leave doors open) to further disperse hydrogen. The volumetric hydrogen generation rates however, are low for the pH 8 and pH 10.4 grout, i.e., less than 0.32 ft{sup 3}/min. Portland cement grout, on the other hand, for the same range of process parameters does not provide a significant margin of safety against the accumulation of flammable gas in the reactor vessel during grouting operations. It is recommended that this grout not be utilized for this task. If further walk-down inspections of the reactor vessels suggest an increase in the actual areal density of aluminum, the calculations should be re-visited.

  18. Regenerative Heater Optimization for Steam Turbo-Generation Cycles of Generation IV Nuclear Power Plants with a Comparison of Two Concepts for the Westinghouse International Reactor Innovative and Secure (IRIS)

    SciTech Connect (OSTI)

    Williams, W.C.

    2002-08-01T23:59:59.000Z

    The intent of this study is to discuss some of the many factors involved in the development of the design and layout of a steam turbo-generation unit as part of a modular Generation IV nuclear power plant. Of the many factors involved in the design and layout, this research will cover feed water system layout and optimization issues. The research is arranged in hopes that it can be generalized to any Generation IV system which uses a steam powered turbo-generation unit. The research is done using the ORCENT-II heat balance codes and the Salisbury methodology to be reviewed herein. The Salisbury methodology is used on an original cycle design by Famiani for the Westinghouse IRIS and the effects due to parameter variation are studied. The vital parameters of the Salisbury methodology are the incremental heater surface capital cost (S) in $/ft{sup 2}, the value of incremental power (I) in $/kW, and the overall heat transfer coefficient (U) in Btu/ft{sup 2}-degrees Fahrenheit-hr. Each is varied in order to determine the effects on the cycles overall heat rate, output, as well as, the heater surface areas. The effects of each are shown. Then the methodology is then used to compare the optimized original Famiani design consisting of seven regenerative feedwater heaters with an optimized new cycle concept, INRC8, containing four regenerative heaters. The results are shown. It can be seen that a trade between the complexity of the seven stage regenerative Famiani cycle and the simplicity of the INRC8 cycle can be made. It is desired that this methodology can be used to show the ability to evaluate modularity through the value of size a complexity of the system as well as the performance. It also shows the effectiveness of the Salisbury methodology in the optimization of regenerative cycles for such an evaluation.

  19. Next Generation Nuclear Plant Project Evaluation of Siting a HTGR Co-generation Plant on an Operating Commercial Nuclear Power Plant Site

    SciTech Connect (OSTI)

    L.E. Demick

    2011-10-01T23:59:59.000Z

    This paper summarizes an evaluation by the Idaho National Laboratory (INL) Next Generation Nuclear Plant (NGNP) Project of siting a High Temperature Gas-cooled Reactor (HTGR) plant on an existing nuclear plant site that is located in an area of significant industrial activity. This is a co-generation application in which the HTGR Plant will be supplying steam and electricity to one or more of the nearby industrial plants.

  20. All farming operations that land apply manure or agricultural process wastewater, whether they generate the manure or import it from another operation, must have a written Manure Management Plan. All farming operations that include an Animal Concentra-

    E-Print Network [OSTI]

    Guiltinan, Mark

    All farming operations that land apply manure or agricultural process wastewater, whether. Pennsylvania Chapter 91 regulations address pollution control and prevention at agricultural operations

  1. Electrohydrodynamic (EHD) Thermal Control Systems (TCS) operate by applying an electric field to a dielectric fluid that, in turn, generates a

    E-Print Network [OSTI]

    Farritor, Shane

    Electrohydrodynamic (EHD) Thermal Control Systems (TCS) operate by applying an electric field to a dielectric fluid that, in turn, generates a force that can be used to pump fluids and separate liquid Electrohydrodynamic (EHD) Based Thermal Control Subsytems at NASAGSFC Jeffrey R. Didion Mathew Showalter NASA Goddard

  2. Abstract --With the increasing acceptance, micro-grid, combined with distributed generation (DG), may be operated in

    E-Print Network [OSTI]

    Chen, Zhe

    ), may be operated in two modes: grid-connected mode and island mode. In grid connected mode, energy operation point; the coordinate control of voltage and frequency with a feed forward control of the voltage the operation modes. The new droop control method has been validated through simulations by PSCAD software

  3. Conceptual design and optimization of a 1-1/2 generation PFBC plant task 14. Topical report

    SciTech Connect (OSTI)

    White, J.S.; Witman, P.M.; Harbaugh, L.; Rubow, L.N.; Horazak, D.A.

    1994-12-01T23:59:59.000Z

    The economics and performance of advanced pressurized fluidized bed (PFBC) cycles developed for utility applications during the last 10 years (especially the 2nd-Generation PFBC cycle) are projected to be favorable compared to conventional pulverized coal power plants. However, the improved economics of 2nd-Generation PFBC cycles are accompanied by the perception of increased technological risk related to the pressurized carbonizer and its associated gas cleanup systems. A PFBC cycle that removed the uncertainties of the carbonizer while retaining the high efficiency and low cost of a 2nd-Generation PFBC cycle could improve the prospects for early commercialization and pave the way for the introduction of the complete 2nd-Generation PFBC cycle at some later date. One such arrangement is a PFBC cycle with natural gas topping combustion, referred to as the 1.5-Generation PFBC cycle. This cycle combines the advantages of the 2nd-Generation PFBC plant with the reduced risk associated with a gas turbine burning natural gas, and can potentially be part of a phased approach leading to the commercialization of utility 2nd-Generation PFBC cycles. The 1.5-Generation PFBC may also introduce other advantages over the more complicated 2nd-Generation PFBC system. This report describes the technical and economic evaluation of 1.5-Generation PFBC cycles for utility or industrial power generation.

  4. Doubly Fed Induction Generator in an Offshore Wind Power Plant Operated at Rated V/Hz: Preprint

    SciTech Connect (OSTI)

    Muljadi, E.; Singh, M.; Gevorgian, V.

    2012-06-01T23:59:59.000Z

    This paper introduces the concept of constant Volt/Hz operation of offshore wind power plants. The deployment of offshore WPPs requires power transmission from the plant to the load center inland. Since this power transmission requires submarine cables, there is a need to use High-Voltage Direct Current transmission, which is economical for transmission distances longer than 50 kilometers. In the concept presented here, the onshore substation is operated at 60 Hz synced with the grid, and the offshore substation is operated at variable frequency and voltage, thus allowing the WPP to be operated at constant Volt/Hz.

  5. Managing power system security and optimization

    SciTech Connect (OSTI)

    O'Grady, M.J. (Potomac Electric Power Co., Washington, DC (United States)); Briggs, W.T.; Stadlin, W.O.

    1994-10-01T23:59:59.000Z

    Power system control objectives of energy management systems (EMSs) are well defined and understood: reliability, security, and optimization. However, the approaches to achieving these objectives have often resulted in disjointed solutions and poor acceptance by system operators. This article describes how the new PEPCO EMS provides unique system-wide (generation, transmission, distribution) security and optimization strategies via a coordinated suite of real-time closed-loop control functions. System operators played a key role in defining the application features and user interfaces, ensuring correct operating practices.

  6. Performance Optimization of a Fan System- Overcoming Impacts of Modified Design Criteria Due to Regulatory Requirements and Changed Operating Conditions

    E-Print Network [OSTI]

    Wroblewski, R. G.; Preis, F.; Smith, R.

    that was applied to address fan inefficiency. Energy savings from optimizing the system are estimated to be 338 kW, nearly half of the original measured input power of 678 kW. The project is currently being implemented and will have a payback period of less than 8...

  7. A Mixed-Integer Linear Programming Model for Optimizing the Scheduling and Assignment of Tank Farm Operations

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 A Mixed-Integer Linear Programming Model for Optimizing the Scheduling and Assignment of Tank, Midland, MI 48674, USA Abstract This paper presents a novel mixed-integer linear programming (MILP multi-product processing lines and the assignment of dedicated storage tanks to finished products

  8. Abstract--This paper presents the consequences and operating limitations of installing distributed generation (DG) to electric

    E-Print Network [OSTI]

    are required for the selection of interruption devices, protective relays, and their coordination. Systems must Terms--Distributed / dispersed generation, power distri- bution, power system protection, fault in siting conventional generation ­ but, for whatever reason, protection engineers as well as transmission

  9. Abundance and distribution of macro-crustaceans in the intake and discharge areas before and during early operation of the Cedar Bayou Generating Station

    E-Print Network [OSTI]

    Schmidt, Monroe

    1972-01-01T23:59:59.000Z

    and Discharge Areas Before and During Early Operation of the Cedar Bayou Generating Station. (May 1972) Monroe Schmidt, A. A. , Blinn College; B. S. , Texas A&M University Directed by: Dr. Kirk Strawn Two trawl and 1 seine station in Tabbs Bay, 2 trawl... were collected twice monthly from May through October 1970. Genera- tion of electric power (and discharge of heated water) by Unit 1, a 750 MW steam-electric unit of the Houston Lighting and Power Company's Cedar Bayou Generating Station, began...

  10. Evaluating shortfalls in mixed-integer programming approaches for the optimal design and dispatch of distributed generation systems

    E-Print Network [OSTI]

    heat and power Fuel cells Building energy a b s t r a c t The distributed generation (DG) of combined Wisconsin, retrofitted with solid-oxide fuel cells (SOFCs) and a hot water storage tank. The simpler model of renewable or non- renewable sources of power generation (e.g., photovoltaic (PV) cells, fuel cells

  11. Integration and operation of post-combustion capture system on coal-fired power generation: load following and peak power

    E-Print Network [OSTI]

    Brasington, Robert David, S.M. Massachusetts Institute of Technology

    2012-01-01T23:59:59.000Z

    Coal-fired power plants with post combustion capture and sequestration (CCS) systems have a variety of challenges to integrate the steam generation, air quality control, cooling water systems and steam turbine with the ...

  12. Adaptive optimization of a lead compensator based upon input command frequency during operations of X-Y positioning table

    E-Print Network [OSTI]

    Jordan, Eric Alan

    1997-01-01T23:59:59.000Z

    . . . . . . . . . . . . . . . . . . . . 15 Fig. 10. Total cost approximation with minimum cost denoted at optimal crossover frequency. . Fig. 11 Example of FFT sampled data depicting time window and zero padding after 18 time window. Fig. 12. FFT frequency determination from partial... 10' 10' 10' Frequency (rad/sec) Fig. 7. Bode plot depicting design specifications. The parameters of the controller are calculated using these specifications. Since the crossover frequency can be realized simply by varying (he gain, the zero...

  13. Dynamic Analysis of Hybrid Energy Systems under Flexible Operation and Variable Renewable Generation -- Part I: Dynamic Performance Analysis and Part II: Dynamic Cost

    SciTech Connect (OSTI)

    Humberto E. Garcia; Amit Mohanty; Wen-Chiao Lin; Robert S. Cherry

    2013-04-01T23:59:59.000Z

    Dynamic analysis of hybrid energy systems (HES) under flexible operation and variable renewable generation is considered in order to better understand various challenges and opportunities associated with the high system variability arising from the integration of renewable energy into the power grid. Unique consequences are addressed by devising advanced HES solutions in which multiple forms of energy commodities, such as electricity and chemical products, may be exchanged. Dynamic models of various unit operations are developed and integrated within two different HES options. One HES option, termed traditional, produces electricity only and consists of a primary heat generator (PHG) (e.g., a small modular reactor), a steam turbine generator, a wind farm, and a battery storage. The other HES option, termed advanced, includes not only the components present in the traditional option but also a chemical plant complex to repurpose excess energy for non-electricity services, such as for the production of chemical goods (e.g., transportation fuel). In either case, a given HES is connected to the power grid at a point of common coupling and requested to deliver a certain electricity generation profile as dictated by a regional power grid operator based on a predicted demand curve. Dynamic analysis of these highly-coupled HES are performed to identify their key dynamical properties and limitations and to prescribe solutions for best managing and mitigating the high variability introduced from incorporating renewable energy into the energy mix. A comparative dynamic cost analysis is also conducted to determine best HES options. The cost function includes a set of metrics for computing fixed costs, such as fixed operations and maintenance (O&M) and overnight capital costs, and also variable operational costs, such as cost of variability, variable O&M cost, and cost of environmental impact, together with revenues. Assuming different options for implementing PHG (e.g., natural gas, coal, nuclear), preliminary results identify the level of renewable penetration at which a given advanced HES option (e.g., a nuclear hybrid) becomes increasingly more economical than a traditional electricity-only generation solution. Conditions are also revealed under which carbon resources may be better utilized as carbon sources for chemical production rather than as combustion material for electricity generation.

  14. Application of Time-Lapse Seismic Monitoring for the Control and Optimization of CO2 Enhanced Oil Recovery Operations

    SciTech Connect (OSTI)

    Brian Toelle

    2008-11-30T23:59:59.000Z

    This project, 'Application of Time-Lapse Seismic Monitoring for the Control and Optimization of CO{sub 2} Enhanced Oil Recovery Operations', investigated the potential for monitoring CO{sub 2} floods in carbonate reservoirs through the use of standard p-wave seismic data. This primarily involved the use of 4D seismic (time lapse seismic) in an attempt to observe and map the movement of the injected CO{sub 2} through a carbonate reservoir. The differences between certain seismic attributes, such as amplitude, were used for this purpose. This technique has recently been shown to be effective in CO{sub 2} monitoring in Enhanced Oil Recovery (EOR) projects, such as Weyborne. This study was conducted in the Charlton 30/31 field in the northern Michigan Basin, which is a Silurian pinnacle reef that completed its primary production in 1997 and was scheduled for enhanced oil recovery using injected CO{sub 2}. Prior to injection an initial 'Base' 3D survey was obtained over the field and was then processed and interpreted. CO{sub 2} injection within the main portion of the reef was conducted intermittently during 13 months starting in August 2005. During this time, 29,000 tons of CO{sub 2} was injected into the Guelph formation, historically known as the Niagaran Brown formation. By September 2006, the reservoir pressure within the reef had risen to approximately 2000 lbs and oil and water production from the one producing well within the field had increased significantly. The determination of the reservoir's porosity distribution, a critical aspect of reservoir characterization and simulation, proved to be a significant portion of this project. In order to relate the differences observed between the seismic attributes seen on the multiple 3D seismic surveys and the actual location of the CO{sub 2}, a predictive reservoir simulation model was developed based on seismic attributes obtained from the base 3D seismic survey and available well data. This simulation predicted that the CO{sub 2} injected into the reef would remain in the northern portion of the field. Two new wells, the State Charlton 4-30 and the Larsen 3-31, were drilled into the field in 2006 and 2008 respectively and supported this assessment. A second (or 'Monitor') 3D seismic survey was acquired during September 2007 over most of the field and duplicated the first (Base) survey, as much as possible. However, as the simulation and new well data available at that time indicated that the CO{sub 2} was concentrated in the northern portion of the field, the second seismic survey was not acquired over the extreme southern end of the area covered by the original (or Base) 3D survey. Basic processing was performed on the second 3D seismic survey and, finally, 4D processing methods were applied to both the Base and the Monitor surveys. In addition to this 3D data, a shear wave seismic data set was obtained at the same time. Interpretation of the 4D seismic data indicated that a significant amplitude change, not attributable to differences in acquisition or processing, existed at the locations within the reef predicted by the reservoir simulation. The reservoir simulation was based on the porosity distribution obtained from seismic attributes from the Base 3D survey. Using this validated reservoir simulation the location of oil within the reef at the time the Monitor survey was obtained and recommendations made for the drilling of additional EOR wells. The economic impact of this project has been estimated in terms of both enhanced oil recovery and CO{sub 2} sequestration potential. In the northern Michigan Basin alone, the Niagaran reef play is comprised of over 700 Niagaran reefs with reservoirs already depleted by primary production. Potentially there is over 1 billion bbls of oil (original oil in place minus primary recovery) remains in the reefs in Michigan, much of which could be more efficiently mobilized utilizing techniques similar to those employed in this study.

  15. EA-0995: Drum Storage Facility for Interim Storage of Materials Generated by Environmental Restoration Operations, Golden, Colorado

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts of the proposal to construct and operate a drum storage facility at the U.S. Department of Energy's Rocky Flats Environmental Technology Site in Golden,...

  16. Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation

    E-Print Network [OSTI]

    Eto, Joseph H.

    2011-01-01T23:59:59.000Z

    electricity (e.g. , steam turbines, combustion turbines,all be used to run a steam turbine). See Undrill (2010) forcycle plants whose steam turbines are operated with their

  17. Optimized scalar promotion with load and splat SIMD instructions

    DOE Patents [OSTI]

    Eichenberger, Alexander E; Gschwind, Michael K; Gunnels, John A

    2013-10-29T23:59:59.000Z

    Mechanisms for optimizing scalar code executed on a single instruction multiple data (SIMD) engine are provided. Placement of vector operation-splat operations may be determined based on an identification of scalar and SIMD operations in an original code representation. The original code representation may be modified to insert the vector operation-splat operations based on the determined placement of vector operation-splat operations to generate a first modified code representation. Placement of separate splat operations may be determined based on identification of scalar and SIMD operations in the first modified code representation. The first modified code representation may be modified to insert or delete separate splat operations based on the determined placement of the separate splat operations to generate a second modified code representation. SIMD code may be output based on the second modified code representation for execution by the SIMD engine.

  18. Analysis and optimization of the Graz cycle : a coal fired power generation scheme with near-zero carbon dioxide emissions

    E-Print Network [OSTI]

    Alexander, Brentan R

    2007-01-01T23:59:59.000Z

    Humans are releasing record amounts of carbon dioxide into the atmosphere through the combustion of fossil fuels in power generation plants. With mounting evidence that this carbon dioxide is a leading cause of global ...

  19. robust passenger oriented airline scheduling - Optimization Online

    E-Print Network [OSTI]

    Luis

    2010-10-29T23:59:59.000Z

    have historically been separated and optimized in a sequential manner. ... objectives are passengers' satisfaction and operator costs. We try to .... a computerized schedule construction system that begins by generating demand using a ...... Environmental Engineering and the Engineering Systems, Massachusetts Institute of.

  20. Hydrogen generation and foaming during tests in the GFPS simulating DWPF operations with Tank 42 sludge and CST

    SciTech Connect (OSTI)

    Koopman, D.C.

    1999-12-08T23:59:59.000Z

    This report summarizes the pilot-scale research requested by the salt disposition team to examine the effect of crystalline silicotitanate (CST) resin with adsorbed noble metals on the maximum hydrogen generation rate produced during the DWPF melter feed preparation processes.

  1. Design, Analysis, and Optimization of a Radioisotope Thermophotovoltaic (RTPV) Generator, and its Applicability to an Illustrative Space Mission

    SciTech Connect (OSTI)

    Schock, Alfred; Mukunda, Meera; Or, Chuen T; Kumar, Vasanth; Summers, G.

    1994-10-01T23:59:59.000Z

    Paper presented at the 45th Congress of the IAF in Jerusalem, Israel, October 1994. The paper describes the results of a DOE-sponsored design study of a radioisotope thermophotovoltaic generator (RTPV), to complement similar studies of Radioisotope Thermoelectric Generators (RTGs) and Stirling Generators (RSGs) previously published by the authors. To focus the design effort, it was decided to direct it at a specific illustrative space mission, Pluto Fast Flyby (PFF). That mission, under study by the JPL, envisages a direct eight to nine-year flight to Pluto (the only unexplored planet in the solar system), followed by comprehensive mapping, surface composition, and atmospheric structure measurements during a brief flyby of the planet and its moon Charon, and transmission of the recorded science data to Earth during a six-week post-encounter cruise.

  2. Optimization of the design and mode of operation of a QD laser for reducing the heat-to-bitrate ratio

    SciTech Connect (OSTI)

    Zhukov, A. E., E-mail: zhukale@gmail.com; Savelyev, A. V. [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)] [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation); Maximov, M. V. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Kryzhanovskaya, N. V. [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)] [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation); Gordeev, N. Yu.; Shernyakov, Yu. M. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Payusov, A. S.; Nadtochiy, A. M.; Zubov, F. I.; Korenev, V. V. [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)] [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)

    2013-08-15T23:59:59.000Z

    Heat dissipation under the high-speed modulation of quantum dot edge-emitting lasers is considered. It is shown that, for a given laser diode, there is a bias current at which the heat-to-bitrate ratio is minimized. Moreover, there exists a certain optimal optical loss of the laser cavity at which the lowest heat-to-bitrate ratio is provided for any design of edge-emitting lasers that can be fabricated from an epitaxial structure. The heat-to-bitrate ratio and the corresponding bitrate are numerically calculated and analytical expressions are derived. It is demonstrated that the heat-to-bitrate ratio of quantum dot edge-emitting lasers can be less than 0.4 pJ/bit at a bitrate exceeding 10 Gbit/s.

  3. Optimized Generation of Data-path from C Codes for FPGAs Zhi Guo Betul Buyukkurt Walid Najjar

    E-Print Network [OSTI]

    Najjar, Walid A.

    on FPGAs, more specifically on CSoCs. It generates RTL level HDLs from frequently executing kernels System- on-a-Chip (CSoC), which has one or more microprocessors integrated with a field-programmable gate in the way of wider acceptance of CSoC platforms is their programmability. Application developers must have

  4. Effect of steam generator configuration in a loss of the RHR during mid-loop operation at PKL facility

    SciTech Connect (OSTI)

    Villanueva, J. F.; Carlos, S.; Martorell, S.; Sanchez, F. [Dpto. Ingenieria Quimica Y Nuclear, Universitat Politecnica de Valencia, Camino Vera s/n, 46022 Valencia (Spain)

    2012-07-01T23:59:59.000Z

    The loss of the residual heat removal system in mid-loop conditions may occur with a non-negligible contribution to the plant risk, so the analysis of the accidental sequences and the actions to mitigate the accident are of great interest in shutdown conditions. In order to plan the appropriate measures to mitigate the accident is necessary to understand the thermal-hydraulic processes following the loss of the residual heat removal system during shutdown. Thus, transients of this kind have been simulated using best-estimate codes in different integral test facilities and compared with experimental data obtained in different facilities. In PKL (Primaerkreislauf-Versuchsanlage, primary coolant loop test facility) test facility different series of experiments have been undertaken to analyze the plant response in shutdown. In this context, the E3 and F2 series consist of analyzing the loss of the residual heat removal system with a reduced inventory in the primary system. In particular, the experiments were developed to investigate the influence of the steam generators secondary side configuration on the plant response, what involves the consideration of different number of steam generators filled with water and ready for activation, on the heat transfer mechanisms inside the steam generators U-tubes. This work presents the results of such experiments calculated using, RELAP5/Mod 3.3. (authors)

  5. Backup power working group best practices handbook for maintenance and operation of engine generators, Volume 1. Revision 1

    SciTech Connect (OSTI)

    Gross, R.; Padgett, A.B.; Burrows, K.P.; Fairchild, P.N.; Lam, T.; Janes, J.

    1997-06-01T23:59:59.000Z

    This handbook is divided into the four chapters. Chapter one covers the design, procurement, storage, handling and testing of diesel fuel oil to be used in DOE backup power supplies. Chapter two discusses the selection of automatic transfer switches to be used in DOE backup power supplies. Chapter three is about low voltage open frame air circuit breaker operation, testing, and maintenance for DOE backup power supplies. And chapter four covers installation, design, and maintenance of engine cooling water and jacket water systems.

  6. Optimization Online - Optimal Scenario Tree Reduction for ...

    E-Print Network [OSTI]

    W.L. Oliveira

    2008-11-21T23:59:59.000Z

    Nov 21, 2008 ... Abstract: The mid-term operation planning of hydro-thermal power systems ... If the number of synthetic sequences is too big, the optimization ...

  7. Performance/Energy Optimization of DSP Transforms on the XScale Processor

    E-Print Network [OSTI]

    Franchetti, Franz

    Performance/Energy Optimization of DSP Transforms on the XScale Processor Paolo D'Alberto, Markus P). To do this, we use SPIRAL, a program generation and optimization system for signal processing transforms energy; this is especially important for devices operating on limited power sources such as batteries

  8. Optimization of Cooling Water

    E-Print Network [OSTI]

    Matson, J.

    A cooling water system can be optimized by operation at the highest possible cycles of concentration without risking sealing and fouling on heat exchanger surfaces. The way to optimize will be shown, with a number of examples of new systems....

  9. Operations Research Analyst

    Broader source: Energy.gov [DOE]

    The incumbent in this position will serve as an Operations Research Analyst in the Generation Scheduling (PGS). The Operations Research Analyst is responsible for analytical work that involves...

  10. Steam generation in line-focus solar collectors: a comparative assessment of thermal performance, operating stability, and cost issues

    SciTech Connect (OSTI)

    Murphy, L.M.; May, E.K.

    1982-04-01T23:59:59.000Z

    The engineering and system benefits of using direct steam (in situ) generation in line-focus collectors are assessed. The major emphasis of the analysis is a detailed thermal performance comparison of in situ systems (which utilize unfired boilers). The analysis model developed for this study is discussed in detail. An analysis of potential flow stability problems is also provided along with a cursory cost analysis and an assessment of freeze protection, safety, and control issues. Results indicated a significant thermal performance advantage over the more conventional oil and flash systems and the flow stability does not appear to be a significant problem. In particular, at steam temperatures of 220/sup 0/C (430/sup 0/F) under the chosen set of assumptions, annual delivered energy predictions indicate that the in situ system can deliver 15% more energy than an oil system and 12% more energy than a flash system, with all of the systems using the same collector field. Further, the in situ system may result in a 10% capital cost reduction. Other advantages include improvement in simpler control when compared with flash systems, and fluid handling and safety enhancement when compared with oil systems.

  11. Composition-optimized TiO{sub 2}/CdS{sub x}Se{sub 1-x} core/shell nanowire arrays for photoelectrochemical hydrogen generation

    SciTech Connect (OSTI)

    Ai, Guanjie; Mo, Rong; Xu, Hang; Chen, Qian; Yang, Sui; Li, Hongxing, E-mail: hongxinglee@xtu.edu.cn; Zhong, Jianxin [Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Hunan 411105 (China)

    2014-11-07T23:59:59.000Z

    Core/shell heterostructured TiO{sub 2}/CdS{sub x}Se{sub 1-x} nanowire arrays (NWAs) were prepared via physical vapor deposition of CdS{sub x}Se{sub 1-x} layer onto the hydrothermal pre-grown TiO{sub 2} NWAs with FTO as conductive substrate. By change the sulfur content (x) in the TiO{sub 2}/CdS{sub x}Se{sub 1-x} nano-composites, it was observed that the light absorption edge can be gradually tuned within a broad wavelength from 540 to 710?nm. When used as photoanodes for hydrogen generation, the as-prepared TiO{sub 2}/CdS{sub x}Se{sub 1-x} NWAs show much higher photoelectroncatalytic activity than the pristine TiO{sub 2} NWAs. Moreover, the TiO{sub 2}/CdS{sub x}Se{sub 1-x} photoelectrode with x?=?0.52 exhibited the highest photocurrent level and outstanding stability, which is more suitable for long-time hydrogen generation. This study may be useful in the design of alloy hetrostructure photoelectrodes with optimal chemical composition toward the more efficient solar conversion devices.

  12. Optimization Online Digest -- March 2015

    E-Print Network [OSTI]

    Real-Time Dispatchability of Bulk Power Systems with Volatile Renewable Generations ... Optimization of Multiple Receivers Solar Power Tower systems

  13. Virtually simulating the next generation of clean energy technologies: NETL's AVESTAR Center is dedicated to the safe, reliable and efficient operation of advanced energy plants with carbon capture

    SciTech Connect (OSTI)

    Zitney, S.

    2012-01-01T23:59:59.000Z

    Imagine using a real-time virtual simulator to learn to fly a space shuttle or rebuild your car's transmission without touching a piece of equipment or getting your hands dirty. Now, apply this concept to learning how to operate and control a state-of-the-art, electricity-producing power plant capable of carbon dioxide (CO{sub 2}) capture. That's what the National Energy Technology Laboratory's (NETL) Advanced Virtual Energy Simulation Training and Research (AVESTAR) Center (www.netl.doe.gov/avestar) is designed to do. Established as part of the Department of Energy's (DOE) initiative to advance new clean energy technology for power generation, the AVESTAR Center focuses primarily on providing simulation-based training for process engineers and energy plant operators, starting with the deployment of a first-of-a-kind operator training simulator for an integrated gasification combined cycle (IGCC) power plant with CO{sub 2} capture. The IGCC dynamic simulator builds on, and reaches beyond, conventional power plant simulators to merge, for the first time, a 'gasification with CO{sub 2} capture' process simulator with a 'combined-cycle' power simulator. Based on Invensys Operations Management's SimSci-Esscor DYNSIM software, the high-fidelity dynamic simulator provides realistic training on IGCC plant operations, including normal and faulted operations, as well as plant start-up, shutdown and power demand load changes. The highly flexible simulator also allows for testing of different types of fuel sources, such as petcoke and biomass, as well as co-firing fuel mixtures. The IGCC dynamic simulator is available at AVESTAR's two locations, NETL (Figure 1) and West Virginia University's National Research Center for Coal and Energy (www.nrcce.wvu.edu), both in Morgantown, W.Va. By offering a comprehensive IGCC training program, AVESTAR aims to develop a workforce well prepared to operate, control and manage commercial-scale gasification-based power plants with CO{sub 2} capture. The facility and simulator at West Virginia University promotes NETL's outreach mission by offering hands-on simulator training and education to researchers and university students.

  14. Optimal Control c David I. Wilson

    E-Print Network [OSTI]

    petroleum refinery, steel smelter, etc.) are very interested in optimal control & operation because it saves

  15. SCHEDULING TVA'S RESERVOIRS WITH RIVERWARE Timothy M. Magee, Operations Research Analyst, Center for Advanced Decision Support

    E-Print Network [OSTI]

    Ware's capabilities with TVA's daily operations scheduling models which optimize hydropower value while meeting non and operates 29 conventional hydropower plants and one pumped storage hydropower plant in the Tennessee Valley to hydropower generation, the reservoir system provides other beneficial services throughout the Tennessee

  16. Cogeneration Operational Issues

    E-Print Network [OSTI]

    Williams, M.

    operations. Other operational issues also include utility transmission planning, generation planning and fuel mix decisions. All of these operational problems have an impact on the ratepayer in regard to quality of electric service and future rates. Both...

  17. Optimization of water distribution operation

    E-Print Network [OSTI]

    Pennington, Walter Carlton

    1987-01-01T23:59:59.000Z

    water demands consistent to LEG ENO FORECAST ? ACTUAL /'4 / /g / I I I /4 / . / li, / 1000 0 2. 5 5. 0 7. 5 10. 0 12. 5 15. 0 17. 5 20. 0 22. 5 25. 0 27. 5 30. 0 TIME [DAYS] FIG. 5. - June 1986, Forecasted vs Actua1 Water Demands O O O Q z... X a CI 4500 3500 3000 2500 2000 l( I '( I l / FORECAST 2. 5 5. 0 7. 5 10. 0 12. 5 15. 0 17. 5 20. 0 22. 5 25. 0 27. 5 30. 0 TIME [DAYS] FIG. 6. - July 1986, Forecasted vs Actual Water Demands 33 the actual variation but the error...

  18. Optimal Operation of Kaibel Columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    of Kaibel distillation column Loss method Control Structure Design Estimation Our estimation method Dynamic Is it necessary to manipulate RV ? Control of Kaibel distillation column Loss method Control Structure Design distillation column Loss method Control Structure Design Estimation Our estimation method Dynamic compensation

  19. OPTIMAL OPERATION USING STRUCTURAL INFORMATION

    E-Print Network [OSTI]

    Skogestad, Sigurd

    structure and heat exchanger areas. In addition to structure and areas, the stream data (heat capacity to controlling the target temperatures, minimizes the utility consumption. The method results in a decentralized, such as variations in supply temperatures, flowrates and possibly in heat transfer coefficients are given. The goal

  20. Optimization of water distribution operation 

    E-Print Network [OSTI]

    Pennington, Walter Carlton

    1987-01-01T23:59:59.000Z

    water demands consistent to LEG ENO FORECAST ? ACTUAL /'4 / /g / I I I /4 / . / li, / 1000 0 2. 5 5. 0 7. 5 10. 0 12. 5 15. 0 17. 5 20. 0 22. 5 25. 0 27. 5 30. 0 TIME [DAYS] FIG. 5. - June 1986, Forecasted vs Actua1 Water Demands O O O Q z... X a CI 4500 3500 3000 2500 2000 l( I '( I l / FORECAST 2. 5 5. 0 7. 5 10. 0 12. 5 15. 0 17. 5 20. 0 22. 5 25. 0 27. 5 30. 0 TIME [DAYS] FIG. 6. - July 1986, Forecasted vs Actual Water Demands 33 the actual variation but the error...

  1. Operational Controls for Variable Generators

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)IntegratedSpeeding access toTest and Evaluation

  2. Multiobjective optimization of the dry electric discharge machining process

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    information on the optimum operating conditions. A number of performance variables such as material removal pressure and spindle speed. A Pareto­optimal front was then obtained using NSGA II. Analysis of the front place through the process of controlled spark generation. It is one of the most popular non

  3. Analysis of the Impact of Balancing Area Cooperation on the Operation of WECC and the Compounding Effect of Wind and Solar Generation

    SciTech Connect (OSTI)

    Jordan, G.; Piwko, D.

    2013-02-01T23:59:59.000Z

    It is the intent of this analysis to examine the operational benefits of increased cooperation between a large number of WECC operating regions.

  4. Steam System Optimization: A Case Study

    E-Print Network [OSTI]

    Iordanova, N.; Venkatesan, V. V.

    /hr is imported from an outside power plant and 170,000 lbslhr is internally generated as waste heat recovery. The steam system analysis identified energy savings worth of $2,400,000 per year. The optimization measures were in two categories: ? no cost / low... cost that can be done through better maintenance and improvement of operating conditions. ? major improvement that requires a significant amount of investment, that includes the modification of process and major equipment. Though the findings...

  5. Hybrid robust predictive optimization method of power system dispatch

    DOE Patents [OSTI]

    Chandra, Ramu Sharat (Niskayuna, NY); Liu, Yan (Ballston Lake, NY); Bose, Sumit (Niskayuna, NY); de Bedout, Juan Manuel (West Glenville, NY)

    2011-08-02T23:59:59.000Z

    A method of power system dispatch control solves power system dispatch problems by integrating a larger variety of generation, load and storage assets, including without limitation, combined heat and power (CHP) units, renewable generation with forecasting, controllable loads, electric, thermal and water energy storage. The method employs a predictive algorithm to dynamically schedule different assets in order to achieve global optimization and maintain the system normal operation.

  6. Optimizing Process Loads in Industrial Cogeneration Energy Systems

    E-Print Network [OSTI]

    Ahner, D. J.; Babson, P. E.

    processes. AUTOMATION REQUIREMENTS The Operations energy Management System (OEMS) can require on-line operation using current measurements (e.g. flow, powers, temperatures, etc.), and calculating optimum energy purchase and equipment dispatch within...kW., A.. kW >- kW OPTIMIZING PROCESS LOADS IN INDUSTRIAL COGENERAnON ENERGY SYSTEMS DJ. Ahner Manager, Generation Technology Power Tecbnologies, Inc. Schenectady, New York ABSTRACT Optimum dispatcb of energy supply systems can...

  7. HOMOTOPY OPTIMIZATION METHODS FOR GLOBAL OPTIMIZATION

    E-Print Network [OSTI]

    O'Leary, Dianne P.

    HOMOTOPY OPTIMIZATION METHODS FOR GLOBAL OPTIMIZATION DANIEL M. DUNLAVY AND DIANNE P. O'LEARY under Grants CCR 02-04084 and CCF 05-14213. 1 #12;2 D.M. DUNLAVY AND D.P. O'LEARY point is generated

  8. Modeling & Optimization An ABB Speciality

    E-Print Network [OSTI]

    generation; transmission systems and substations; network management Low-voltage products; contactors, soft, 2009 | Slide 11 #12;Steps to Achieve Advanced Control / Optimization Build process model: First principle (White Box) Black box Grey box Design controller / optimizer / product Engineer / implement

  9. November 18, 2008 1 Abstract--In this paper, we analyze the N-1 reliable DC optimal

    E-Print Network [OSTI]

    Ferris, Michael C.

    of the transmission element (line or transformer) and the model can be used for planning and/or operations. We or transformer) g: generator d: load c: operating state; c = 0 indicates the no contingency state (steady- stateNovember 18, 2008 1 Abstract--In this paper, we analyze the N-1 reliable DC optimal dispatch

  10. Partially Adaptive Stochastic Optimization for Electric Power ...

    E-Print Network [OSTI]

    Jikai Zou

    2015-01-03T23:59:59.000Z

    Jan 3, 2015 ... Abstract: Electric Power Generation Expansion Planning (GEP) is the problem of determining an optimal construction and generation plan of ...

  11. Optimal Model-Based Production Planning

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 Optimal Model-Based Production Planning for Refinery Operation Abdulrahman Alattas Advisor Steam distillation column Conclusion #12;3 Introduction Refinery production planning models Optimizing refinery operation Crude selection Maximizing profit; minimizing cost LP-based, linear process unit

  12. Optimization Online Digest -- January 2015

    E-Print Network [OSTI]

    Object-Parallel Infrastructure for Implementing First-Order Methods, with an Example ... Partially Adaptive Stochastic Optimization for Electric Power Generation ...

  13. Optimal Cloning and No Signaling

    E-Print Network [OSTI]

    Sibasish Ghosh; Guruprasad Kar; Anirban Roy

    1999-07-01T23:59:59.000Z

    It is shown that no signaling constraint generates the whole class of 1 $\\rightarrow$ 2 optimal quantum cloning machines of single qubits.

  14. Optimizing Co-Processing of Bio-Oil in Refinery Unit Operations Using a Davison Criculating Riser Presentatio for BETO 2015 Project Peer Review

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment ofOil'sEnergy8 * October 2006OptimizingOptimizing

  15. Research Note on a Parabolic Heat-Balance Integral Method with Unspecified Exponent: An Entropy Generation Approach in Optimal Profile Determination

    E-Print Network [OSTI]

    Jordan Hristov

    2010-12-12T23:59:59.000Z

    The heat-balance integral method of Goodman is studied with two simple 1-D heat conduction problems with prescribed temperature and flux boundary conditions. These classical problems with well known exact solutions enable to demonstrate the heat-balance integral method performance by a parabolic profile and the entropy generation minimization concept in definition of the appropriate profile exponent. The basic assumption generating the additional constraints needed to perform the solution is based on the requirement to minimize the difference in the local thermal entropy generation rates calculated by the approximate and the exact profile, respectively. This concept is easily applicable since the general concept has simple implementation of the condition requiring the thermal entropy generations calculated through both profiles to be the same at the boundary. The entropy minimization generation approach automatically generates the additional requirement which is deficient in the set of conditions defined by the heat-balance integral method concept.

  16. COMPUTATIONAL OPTIMIZATION OF GAS COMPRESSOR ...

    E-Print Network [OSTI]

    2015-02-26T23:59:59.000Z

    Feb 26, 2015 ... When considering cost-optimal operation of gas transport net- works ..... The four most frequently used drive types are gas turbines, gas driven.

  17. Study on Control Performance of HVAC System or Interior Zone and Perimeter Zone in Office Building; Estimation of Optimal PI Tuning in Cooling Operation

    E-Print Network [OSTI]

    Maehara, K.; Sagara, N.

    2007-01-01T23:59:59.000Z

    of not being able to satisfy the requirements of room temperature control during the cooling period in summer, an optimal PID parameter (O-PI) is selected through simulation of its two feedback control systems with mutual influence using the models identified...

  18. Wholesale marginal prices in competitive generation markets

    SciTech Connect (OSTI)

    Perez-Arriaga, I.J. [National Electric Regulatory Commission, Madrid (Spain)] [National Electric Regulatory Commission, Madrid (Spain); Meseguer, C. [Univ. Pontificia Comillas, Madrid (Spain). Inst. de Investigacion Tecnologica] [Univ. Pontificia Comillas, Madrid (Spain). Inst. de Investigacion Tecnologica

    1997-05-01T23:59:59.000Z

    Wholesale marginal electricity prices are being used in several actual competitive generation markets worldwide, both to remunerate generators and to charge consumption. These prices must account not only for energy, but also for guarantee of supply in the long and the short term. This paper: (a) provides a sound conceptual and quantitative foundation for wholesale pricing based on generation services, where any existing restrictions in operation or planning in real power markets are accounted for, (b) clearly establishes the relationship between short term marginal costs, long term marginal costs and optimal wholesale electricity prices, and (c) identifies the reasons for mismatches in cost recovery with marginal generation prices. The theoretical results are verified with a detailed realistic power system model.

  19. 3190.ps - Optimization Online

    E-Print Network [OSTI]

    fare, it is essential to select and operate at an equilibrium with optimal social ...... construct the CSP matrix R for L(?,(si(?))i?I? )?? based on (16) to induce a ...

  20. Optimization of Hot Standby

    E-Print Network [OSTI]

    de Souza, J.; Holden, D.

    2004-01-01T23:59:59.000Z

    Energy Optimization is one of the key issues facing the chemical process industries today. The drivers are both economic and environmental. Utilities are among the top operating expenses for manufacturers, reflecting elevated energy prices...

  1. Optimization Online

    E-Print Network [OSTI]

    Optimization Online is a repository of e-prints about optimization and related topics. Submissions to Optimization Online are moderated by a team of volunteer

  2. Decision support for operations and maintenance (DSOM) system

    DOE Patents [OSTI]

    Jarrell, Donald B. (Kennewick, WA); Meador, Richard J. (Richland, WA); Sisk, Daniel R. (Richland, WA); Hatley, Darrel D. (Kennewick, WA); Brown, Daryl R. (Richland, WA); Keibel, Gary R. (Richland, WA); Gowri, Krishnan (Richland, WA); Reyes-Spindola, Jorge F. (Richland, WA); Adams, Kevin J. (San Bruno, CA); Yates, Kenneth R. (Lake Oswego, OR); Eschbach, Elizabeth J. (Fort Collins, CO); Stratton, Rex C. (Richland, WA)

    2006-03-21T23:59:59.000Z

    A method for minimizing the life cycle cost of processes such as heating a building. The method utilizes sensors to monitor various pieces of equipment used in the process, for example, boilers, turbines, and the like. The method then performs the steps of identifying a set optimal operating conditions for the process, identifying and measuring parameters necessary to characterize the actual operating condition of the process, validating data generated by measuring those parameters, characterizing the actual condition of the process, identifying an optimal condition corresponding to the actual condition, comparing said optimal condition with the actual condition and identifying variances between the two, and drawing from a set of pre-defined algorithms created using best engineering practices, an explanation of at least one likely source and at least one recommended remedial action for selected variances, and providing said explanation as an output to at least one user.

  3. Weather forecast-based optimization of integrated energy systems.

    SciTech Connect (OSTI)

    Zavala, V. M.; Constantinescu, E. M.; Krause, T.; Anitescu, M.

    2009-03-01T23:59:59.000Z

    In this work, we establish an on-line optimization framework to exploit detailed weather forecast information in the operation of integrated energy systems, such as buildings and photovoltaic/wind hybrid systems. We first discuss how the use of traditional reactive operation strategies that neglect the future evolution of the ambient conditions can translate in high operating costs. To overcome this problem, we propose the use of a supervisory dynamic optimization strategy that can lead to more proactive and cost-effective operations. The strategy is based on the solution of a receding-horizon stochastic dynamic optimization problem. This permits the direct incorporation of economic objectives, statistical forecast information, and operational constraints. To obtain the weather forecast information, we employ a state-of-the-art forecasting model initialized with real meteorological data. The statistical ambient information is obtained from a set of realizations generated by the weather model executed in an operational setting. We present proof-of-concept simulation studies to demonstrate that the proposed framework can lead to significant savings (more than 18% reduction) in operating costs.

  4. Process optimization made easy: design of experiments with multi-bioreactor system BIOSTAT Qplus

    E-Print Network [OSTI]

    Cai, Long

    Process optimization made easy: design of experiments with multi-bioreactor system BIOSTAT® Qplus and statistical evaluation of experiments. Although a DoE investigation is executable in one bioreactor, multi-bioreactor generation of bioreactor systems designed for parallel operation (Fig. 1). Application-driven, pre

  5. Edinburgh Research Explorer Local solutions of the optimal power flow problem

    E-Print Network [OSTI]

    Millar, Andrew J.

    law (KVL), which describes the flow of power in transmission lines, and is a nonlinear function of bus is to find a steady state operating point that minimizes the cost of electric power generation whileEdinburgh Research Explorer Local solutions of the optimal power flow problem Citation

  6. Control and optimization system

    DOE Patents [OSTI]

    Xinsheng, Lou

    2013-02-12T23:59:59.000Z

    A system for optimizing a power plant includes a chemical loop having an input for receiving an input parameter (270) and an output for outputting an output parameter (280), a control system operably connected to the chemical loop and having a multiple controller part (230) comprising a model-free controller. The control system receives the output parameter (280), optimizes the input parameter (270) based on the received output parameter (280), and outputs an optimized input parameter (270) to the input of the chemical loop to control a process of the chemical loop in an optimized manner.

  7. Gamma ray generator

    DOE Patents [OSTI]

    Firestone, Richard B; Reijonen, Jani

    2014-05-27T23:59:59.000Z

    An embodiment of a gamma ray generator includes a neutron generator and a moderator. The moderator is coupled to the neutron generator. The moderator includes a neutron capture material. In operation, the neutron generator produces neutrons and the neutron capture material captures at least some of the neutrons to produces gamma rays. An application of the gamma ray generator is as a source of gamma rays for calibration of gamma ray detectors.

  8. The effect of the operation modes of a gas discharge low-pressure amalgam lamp on the intensity of generation of 185 nm UV vacuum radiation

    SciTech Connect (OSTI)

    Vasilyak, L. M., E-mail: vasilyak@ihed.ras.ru [Russian Academy of Sciences, Joint Institute of High Temperatures (Russian Federation); Drozdov, L. A., E-mail: lit@npo.lit.ru; Kostyuchenko, S. V.; Sokolov, D. V. [ZAO LIT (Russian Federation); Kudryavtsev, N. N.; Sobur, D. A., E-mail: soburda@gmail.com [Moscow Institute for Physics and Technology (Russian Federation)

    2011-12-15T23:59:59.000Z

    The effect of the discharge current, mercury vapor pressure, and the inert gas pressure on the intensity and efficiency of the 185 nm line generation are considered. The spectra of the UV radiation (vacuum ultraviolet) transmission by protective coatings from the oxides of rare earth metals and aluminum are investigated.

  9. Optimization Journals, Sites, Societies

    E-Print Network [OSTI]

    Optimization Online Links. Optimization related societies. Mathematical Optimization Society · SIAM · INFORMS. Optimization related journals. Mathematical ...

  10. Robust optimization based self scheduling of hydro-thermal Genco ...

    E-Print Network [OSTI]

    Alireza Soroudi

    2013-12-29T23:59:59.000Z

    Dec 29, 2013 ... Abstract: This paper proposes a robust optimization model for optimal self scheduling of a hydro-thermal generating company. The proposed ...

  11. Energy optimization system

    DOE Patents [OSTI]

    Zhou, Zhi; de Bedout, Juan Manuel; Kern, John Michael; Biyik, Emrah; Chandra, Ramu Sharat

    2013-01-22T23:59:59.000Z

    A system for optimizing customer utility usage in a utility network of customer sites, each having one or more utility devices, where customer site is communicated between each of the customer sites and an optimization server having software for optimizing customer utility usage over one or more networks, including private and public networks. A customer site model for each of the customer sites is generated based upon the customer site information, and the customer utility usage is optimized based upon the customer site information and the customer site model. The optimization server can be hosted by an external source or within the customer site. In addition, the optimization processing can be partitioned between the customer site and an external source.

  12. CSEM WP 135 Has Restructuring Improved Operating Efficiency

    E-Print Network [OSTI]

    California at Berkeley. University of

    CSEM WP 135 Has Restructuring Improved Operating Efficiency at US Electricity Generating Plants Operating Efficiency at US Electricity Generating Plants? Kira Markiewicz UC Berkeley, Haas School assesses the impact of electricity industry restructuring on generating plant operating efficiency. Cost

  13. Assessment of Distributed Generation Potential in JapaneseBuildings

    SciTech Connect (OSTI)

    Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida,Masaru

    2005-05-25T23:59:59.000Z

    To meet growing energy demands, energy efficiency, renewable energy, and on-site generation coupled with effective utilization of exhaust heat will all be required. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems (or microgrids). This research investigates a method of choosing economically optimal DER, expanding on prior studies at the Berkeley Lab using the DER design optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM finds the optimal combination of installed equipment from available DER technologies, given prevailing utility tariffs, site electrical and thermal loads, and a menu of available equipment. It provides a global optimization, albeit idealized, that shows how the site energy loads can be served at minimum cost by selection and operation of on-site generation, heat recovery, and cooling. Five prototype Japanese commercial buildings are examined and DER-CAM applied to select the economically optimal DER system for each. The five building types are office, hospital, hotel, retail, and sports facility. Based on the optimization results, energy and emission reductions are evaluated. Furthermore, a Japan-U.S. comparison study of policy, technology, and utility tariffs relevant to DER installation is presented. Significant decreases in fuel consumption, carbon emissions, and energy costs were seen in the DER-CAM results. Savings were most noticeable in the sports facility (a very favourable CHP site), followed by the hospital, hotel, and office building.

  14. Species composition, distribution, and seasonal abundance of macro-zooplankton in intake and discharge areas before and during early operation of the Cedar Bayou generating station

    E-Print Network [OSTI]

    Kalke, Richard D

    1972-01-01T23:59:59.000Z

    collections were made during the first and third weekends of each month. As of March I, 1970 collec- tions were made on alternate weekends for purposes of greater uni- formity. Generation of electric power and discharge of heated water by Unit 1, a 750 MW... for invertebrates while Middle Bay, Tabbs Bay and Cedar Bayou ranked in decreas1ng order. Factors thought to have caused differences in abundance of species and catch per effort between the areas studied were: (I) degree of pollution in each area, (2) amount...

  15. Modeling Power System Operation with Intermittent Resources

    SciTech Connect (OSTI)

    Marinovici, Maria C.; Kirkham, Harold; Glass, Kevin A.; Carlsen, Leif C.

    2013-02-27T23:59:59.000Z

    Electricity generating companies and power system operators face the need to minimize total fuel cost or maximize total profit over a given time period. These issues become optimization problems subject to a large number of constraints that must be satisfied simultaneously. The grid updates due to smart-grid technologies plus the penetration of intermittent re- sources in electrical grid introduce additional complexity to the optimization problem. The Renewable Integration Model (RIM) is a computer model of interconnected power system. It is intended to provide insight and advice on complex power systems management, as well as answers to integration of renewable energy questions. This paper describes RIM basic design concept, solution method, and the initial suite of modules that it supports.

  16. An optimal Wegner estimate and its application to the global continuity of the integrated density of states for random Schrödinger operators

    E-Print Network [OSTI]

    Jean-Michel Combes; Peter Hislop; Frédéric Klopp

    2006-10-14T23:59:59.000Z

    We prove that the integrated density of states (IDS) of random Schr\\"{o}dinger operators with Anderson-type potentials on $L^2 (\\R^d)$, for $d \\geq1$, is locally H\\"{o}lder continuous at all energies with the same H\\"{o}lder exponent $0energies. The single-site potential $u\\in L\\_0^\\infty (\\R^d)$ must be nonnegative and compactly-supported. The unperturbed Hamiltonian must be periodic and satisfy a unique continuation principle. We also prove analogous continuity results for the IDS of random Anderson-type perturbations of the Landau Hamiltonian in two-dimensions. All of these results follow from a new Wegner estimate for local random Hamiltonians with rather general probability measures.

  17. Optimal control with adaptive internal dynamics models 

    E-Print Network [OSTI]

    Mitrovic, Djordje; Klanke, Stefan; Vijayakumar, Sethu

    2008-01-01T23:59:59.000Z

    Optimal feedback control has been proposed as an attractive movement generation strategy in goal reaching tasks for anthropomorphic manipulator systems. The optimal feedback control law for systems with non-linear dynamics ...

  18. U.S. Installation, Operation, and Performance Standards for Microturbi...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Installation, Operation, and Performance Standards for Microturbine Generator Sets, August 2000 U.S. Installation, Operation, and Performance Standards for Microturbine Generator...

  19. Optimal Model-Based Production Planning

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 Optimal Model-Based Production Planning for Refinery Operation Abdulrahman Alattas Advisor;2 Outline Introduction Problem Statement Refinery Planning Model Development LP Planning Models NLP Planning Models Conclusion #12;3 Introduction Refinery production planning models Optimizing refinery

  20. Operations | Argonne National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Operations Argonne mentors students for the next generation of scientistsMay 28, 2015 On May 6, the accomplishments of seventeen Chicago-area high school students that had been...

  1. Final Submission to Optimization and Engineering (Paper Number: OPTE 279 NA)

    E-Print Network [OSTI]

    Chen, Wei

    ), and Automobile Design (Bennet 1997). However, the traditional MDO generates deterministic optimal designs, which

  2. Local Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul Trodden

    E-Print Network [OSTI]

    Grothey, Andreas

    is primarily due to Kirchhoff's voltage law (KVL), which describes the flow of power in transmission lines that minimizes the cost of electric power generation while satisfying operating constraints and meeting demandLocal Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul

  3. Sootblowing optimization for improved boiler performance

    DOE Patents [OSTI]

    James, John Robert; McDermott, John; Piche, Stephen; Pickard, Fred; Parikh, Neel J.

    2012-12-25T23:59:59.000Z

    A sootblowing control system that uses predictive models to bridge the gap between sootblower operation and boiler performance goals. The system uses predictive modeling and heuristics (rules) associated with different zones in a boiler to determine an optimal sequence of sootblower operations and achieve boiler performance targets. The system performs the sootblower optimization while observing any operational constraints placed on the sootblowers.

  4. Sootblowing optimization for improved boiler performance

    DOE Patents [OSTI]

    James, John Robert; McDermott, John; Piche, Stephen; Pickard, Fred; Parikh, Neel J

    2013-07-30T23:59:59.000Z

    A sootblowing control system that uses predictive models to bridge the gap between sootblower operation and boiler performance goals. The system uses predictive modeling and heuristics (rules) associated with different zones in a boiler to determine an optimal sequence of sootblower operations and achieve boiler performance targets. The system performs the sootblower optimization while observing any operational constraints placed on the sootblowers.

  5. REQUEST BY WESTINGHOUSE POWER GENERATION, A FORMER DIVISION OF...

    Broader source: Energy.gov (indexed) [DOE]

    selection and optimization to develop the next generation of gas-fired advanced turbine systems (ATS's) for green field and repowered electricity generation applications....

  6. Sandia National Laboratories: Utility Operations and Programs

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Market TransformationUtility Operations and Programs Utility Operations and Programs Utilities need to understand how solar generating technologies will behave on their systems...

  7. Optimization Neuroimaging'',

    E-Print Network [OSTI]

    Nielsen, Finn Ã?rup

    Canonical Ridge Analysis with Ridge Parameter Optimization F. �. Nielsen, L. K. Hansen and S. C - PLS 1 = k 0 = k optimal k k = optimal k k £ £ 0 #12; Canonical Ridge Analysis with Ridge Parameter Optimization F. �. Nielsen, L. K. Hansen and S. C. Strother The Human Brain Project, P20 MH57180 ``Spatial

  8. Optimization Online - Conjugate gradient methods based on secant ...

    E-Print Network [OSTI]

    Y Narushima

    2011-09-28T23:59:59.000Z

    Sep 28, 2011 ... Conjugate gradient methods based on secant conditions that generate descent search directions for unconstrained optimization.

  9. FIELD TEST INSTRUCTION 100-NR-2 OPERABLE UNIT DESIGN OPTIMIZATION STUDY FOR SEQUESTRATION OF SR-90 SATURATED ZONE APATITE PERMEABLE REACTIVE BARRIER EXTENSION

    SciTech Connect (OSTI)

    BOWLES NA

    2010-10-06T23:59:59.000Z

    The objective of this field test instruction is to provide technical guidance for aqueous injection emplacement of an extension apatite permeable reactive barrier (PRE) for the sequestration of strontium-90 (Sr-90) using a high concentration amendment formulation. These field activities will be conducted according to the guidelines established in DOE/RL-2010-29, 100-NR-2 Design Optimization Study, hereafter referred to as the DOS. The DOS supports the Federal Facility Agreement Consent Order (EPA et al., 1989), Milestone M-16-06-01, and 'Complete Construction of a Permeable Reactive Barrier at 100-N.' Injections of apatite precursor chemicals will occur at an equal distance intervals on each end of the existing PRE to extend the PRB from the existing 91 m (300 ft) to at least 274 m (900 ft). Field testing at the 100-N Area Apatite Treatability Test Site, as depicted on Figure 1, shows that the barrier is categorized by two general hydrologic conceptual models based on overall well capacity and contrast between the Hanford and Ringold hydraulic conductivities. The upstream portion of the original barrier, shown on Figure 1, is characterized by relatively low overall well specific capacity. This is estimated from well development data and a lower contrast in hydraulic conductivity between the Hanford formation and Ringold Formations. Comparison of test results from these two locations indicate that permeability contrast between the Hanford formation and Ringold Formation is significantly less over the upstream one-third of the barrier. The estimated hydraulic conductivity for the Hanford formation and Ringold Formation over the upstream portion of the barrier based on observations during emplacement of the existing 91 m (300 ft) PRB is approximately 12 and 10 m/day (39 and 32 ft/day), respectively (PNNL-17429). However, these estimates should be used as a rough guideline only, as significant variability in hydraulic conductivity is likely to be observed in the barrier extension wells, particularly those in the Ringold formation. The downstream portion of the original barrier, shown on Figure 1, is characterized by generally higher well specific capacity and a larger hydraulic conductivity contrast between the Hanford formation and Ringold Formation. Hydraulic conductivity rates for the Hanford formation and Ringold Formation over the downstream portion of the barrier were estimated at 29 and 9 m/day (95 and 29 ft/day), respectively (with the Hanford formation hydraulic conductivity being greater in the downstream portion than the upstream portion). Once again, it should be noted that the actual conductivities may vary significantly, and the values state above should only be used as a rough initial estimates. Optimum apatite emplacement has been shown to occur when injections targeting the Hanford formation and the Ringold Formation are performed separately. The remainder of this test instruction provides details for conducting these formation-targeted injections.

  10. Finding Benefits by Modeling and Optimizing Steam and Power Systems

    E-Print Network [OSTI]

    Jones, B.; Nelson, D.

    2007-01-01T23:59:59.000Z

    A site-wide steam modeling and optimization program (Visual MESA) was implemented at the INEOS Chocolate Bayou site. This program optimizes steam production, compressor turbine extraction, pump operation (turbine/motor) operation, as well...

  11. Finding Benefits by Modeling and Optimizing Steam and Power Systems 

    E-Print Network [OSTI]

    Jones, B.; Nelson, D.

    2007-01-01T23:59:59.000Z

    A site-wide steam modeling and optimization program (Visual MESA) was implemented at the INEOS Chocolate Bayou site. This program optimizes steam production, compressor turbine extraction, pump operation (turbine/motor) operation, as well...

  12. OPTIMAL DESIGN OF HYBRID FUEL CELL VEHICLES

    E-Print Network [OSTI]

    Jeongwoo Han; Michael Kokkolaras; Panos Papalambros

    Fuel cells are being considered increasingly as a viable alternative energy source for automobiles because of their clean and efficient power generation. Numerous technological concepts have been developed and compared in terms of safety, robust operation, fuel economy, and vehicle performance. However, several issues still exist and must be addressed to improve the viability of this emerging technology. Despite the relatively large number of models and prototypes, a model-based vehicle design capability with sufficient fidelity and efficiency is not yet available in the literature. In this article we present an analysis and design optimization model for fuel cell vehicles that can be applied to both hybrid and non-hybrid vehicles by integrating a fuel cell vehicle simulator with a physics-based fuel cell model. The integration is achieved via quasi-steady fuel cell performance maps, and provides the ability to modify the characteristics of fuel cell systems with sufficient accuracy (less than 5 % error) and efficiency (98 % computational time reduction on average). Thus, a vehicle can be optimized subject to constraints that include various performance metrics and design specifications so that the overall efficiency of the hybrid fuel cell vehicle can be improved by 14 % without violating any constraints. The obtained optimal fuel cell system is also compared to other, not vehicle-related, fuel cell systems optimized for maximum power density or maximum efficiency. A tradeoff between power density and efficiency can be observed depending on the size of compressors. Typically, a larger compressor results in higher fuel cell power density at the cost of fuel cell efficiency because it operates in a wider current region. When optimizing the fuel cell

  13. Process Design and Operation for Energy Efficiency

    E-Print Network [OSTI]

    Rossiter, A. P.; Nath, R.; Yell, M. D.

    by the following example from a large petrochemical plant that recently installed an optimization system: It was plant practice to maintain a large steam reserve in the operation...

  14. Washington Nuclear Profile - Columbia Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    Columbia Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

  15. Illinois Nuclear Profile - Dresden Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    Dresden Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

  16. Illinois Nuclear Profile - Byron Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    Byron Generating Station" ,"Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date"...

  17. Illinois Nuclear Profile - Braidwood Generation Station

    U.S. Energy Information Administration (EIA) Indexed Site

    Braidwood Generation Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License...

  18. Optimization Online - All Areas Submissions - January 2015

    E-Print Network [OSTI]

    Partially Adaptive Stochastic Optimization for Electric Power Generation Expansion ... Object-Parallel Infrastructure for Implementing First-Order Methods, with an ...

  19. Optimization Online - A Simpler Approach to Matrix Completion

    E-Print Network [OSTI]

    Benjamin Recht

    2009-10-04T23:59:59.000Z

    Oct 4, 2009 ... Keywords: Matrix completion, low-rank matrices, convex optimization, nuclear norm minimization, random matrices, operator Chernoff bound, ...

  20. Sandia National Laboratories: next generation energy technology

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    next generation energy technology SWiFT Commissioned to Study Wind Farm Optimization On July 29, 2013, in Energy, Facilities, News, News & Events, Partnership, Renewable Energy,...

  1. Load-follow control simulation with optimization

    SciTech Connect (OSTI)

    Yim, Man-Sung; Christenson, J.M.

    1989-01-01T23:59:59.000Z

    For the simulation of load-follow control operation of pressurized water reactors (PWRs), the system model needs to describe both primary and secondary system behaviors, because the load-change signal in the secondary system delivers a change in the primary system through the thermal-hydraulic interactions in the steam generator. In this study, the characteristics of load-follow control for a PWR were investigated using a one-dimensional core model combined with a simplified nuclear steam supply system model using optimization. The overall system model includes one-dimensional core neutronics with all the space-dependent feedback effects, Xe-I dynamics, core thermal balances, primary loop thermal balances, and steam generator dynamic responses to turbine load changes. The final system equations were manipulated for the lumped parameter representations by using the model expansion technique for the core model.

  2. The thermodynamics of creating correlations: Limitations and optimal protocols

    E-Print Network [OSTI]

    David Edward Bruschi; Martí Perarnau-Llobet; Nicolai Friis; Karen V. Hovhannisyan; Marcus Huber

    2015-03-11T23:59:59.000Z

    We establish a rigorous connection between fundamental resource theories at the quantum scale. Correlations and entanglement constitute indispensable resources for numerous quantum information tasks. However, their establishment comes at the cost of energy, the resource of thermodynamics, and is limited by the initial entropy. Here, the optimal conversion of energy into correlations is investigated. Assuming the presence of a thermal bath, we establish general bounds for arbitrary systems and construct a protocol saturating them. The amount of correlations, quantified by the mutual information, can increase at most linearly with the available energy, and we determine where the linear regime breaks down. We further consider the generation of genuine quantum correlations, focusing on the fundamental constituents of our universe: fermions and bosons. For fermionic modes, we find the optimal entangling protocol. For bosonic modes, we show that while Gaussian operations can be outperformed in creating entanglement, their performance is optimal for high energies.

  3. A linear nonequilibrium thermodynamics approach to optimization of thermoelectric devices

    E-Print Network [OSTI]

    Ouerdane, H; Apertet, Y; Michot, A; Abbout, A

    2013-01-01T23:59:59.000Z

    Improvement of thermoelectric systems in terms of performance and range of applications relies on progress in materials science and optimization of device operation. In this chapter, we focuse on optimization by taking into account the interaction of the system with its environment. For this purpose, we consider the illustrative case of a thermoelectric generator coupled to two temperature baths via heat exchangers characterized by a thermal resistance, and we analyze its working conditions. Our main message is that both electrical and thermal impedance matching conditions must be met for optimal device performance. Our analysis is fundamentally based on linear nonequilibrium thermodynamics using the force-flux formalism. An outlook on mesoscopic systems is also given.

  4. Optimization Online Digest -- March 2008

    E-Print Network [OSTI]

    Tractable Robust Expected Utility and Risk Models for Portfolio Optimization ... of a semidefinite programming solver based on CSDP on a distributed memory cluster ... Epi-convergent Scenario Generation Method for Stochastic Problems via ...

  5. Computational Optimization of Gas Compressor Stations: MINLP ...

    E-Print Network [OSTI]

    Daniel Rose

    2015-02-26T23:59:59.000Z

    Feb 26, 2015 ... Abstract: When considering cost-optimal operation of gas transport networks, compressor stations play the most important role. Proper ...

  6. Power Generation Asset Management Technology Roadmap M

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    be done to determine optimal sensor deployment to address these criteria. TC8 Incorporate turbine layouts, make efforts and operational status within wind power plants to have more...

  7. Registration of Electric Generators (Connecticut)

    Broader source: Energy.gov [DOE]

    All electric generating facilities operating in the state, with the exception of hydroelectric and nuclear facilities, must obtain a certificate of registration from the Department of Public...

  8. Operational Effectiveness in Use fo BAS 

    E-Print Network [OSTI]

    Bobker, M.; Joseph, M.; Ascazubi, M.; Brown, T.; Thorpe, K.; Essman, J.

    2013-01-01T23:59:59.000Z

    ?to??suck?out?the?data?? ? Database?Feudalism? ? proliferation?without? shared?standard ? Re?creating?the?inter? operability?situation ? More?complex??optimizing??control? routines?? challenges?for?the?human? operators ICEBO?2013???????????????????????????CITY...

  9. Optimal Control of Distributed Energy Resources using Model Predictive Control

    SciTech Connect (OSTI)

    Mayhorn, Ebony T.; Kalsi, Karanjit; Elizondo, Marcelo A.; Zhang, Wei; Lu, Shuai; Samaan, Nader A.; Butler-Purry, Karen

    2012-07-22T23:59:59.000Z

    In an isolated power system (rural microgrid), Distributed Energy Resources (DERs) such as renewable energy resources (wind, solar), energy storage and demand response can be used to complement fossil fueled generators. The uncertainty and variability due to high penetration of wind makes reliable system operations and controls challenging. In this paper, an optimal control strategy is proposed to coordinate energy storage and diesel generators to maximize wind penetration while maintaining system economics and normal operation. The problem is formulated as a multi-objective optimization problem with the goals of minimizing fuel costs and changes in power output of diesel generators, minimizing costs associated with low battery life of energy storage and maintaining system frequency at the nominal operating value. Two control modes are considered for controlling the energy storage to compensate either net load variability or wind variability. Model predictive control (MPC) is used to solve the aforementioned problem and the performance is compared to an open-loop look-ahead dispatch problem. Simulation studies using high and low wind profiles, as well as, different MPC prediction horizons demonstrate the efficacy of the closed-loop MPC in compensating for uncertainties in wind and demand.

  10. Plant Energy Cost Optimization Program (PECOP)

    E-Print Network [OSTI]

    Robinson, A. M.

    1980-01-01T23:59:59.000Z

    The Plant Energy Cost Optimization Program (PECOP) is a Management System designed to reduce operating cost in a continuous operating multi product plant by reviewing all cost factors and selecting plant wide production schedules which are most...

  11. Synthetic guide star generation

    DOE Patents [OSTI]

    Payne, Stephen A.; Page, Ralph H.; Ebbers, Christopher A.; Beach, Raymond J.

    2004-03-09T23:59:59.000Z

    A system for assisting in observing a celestial object and providing synthetic guide star generation. A lasing system provides radiation at a frequency at or near 938 nm and radiation at a frequency at or near 1583 nm. The lasing system includes a fiber laser operating between 880 nm and 960 nm and a fiber laser operating between 1524 nm and 1650 nm. A frequency-conversion system mixes the radiation and generates light at a frequency at or near 589 nm. A system directs the light at a frequency at or near 589 nm toward the celestial object and provides synthetic guide star generation.

  12. Synthetic guide star generation

    DOE Patents [OSTI]

    Payne, Stephen A. (Castro Valley, CA) [Castro Valley, CA; Page, Ralph H. (Castro Valley, CA) [Castro Valley, CA; Ebbers, Christopher A. (Livermore, CA) [Livermore, CA; Beach, Raymond J. (Livermore, CA) [Livermore, CA

    2008-06-10T23:59:59.000Z

    A system for assisting in observing a celestial object and providing synthetic guide star generation. A lasing system provides radiation at a frequency at or near 938 nm and radiation at a frequency at or near 1583 nm. The lasing system includes a fiber laser operating between 880 nm and 960 nm and a fiber laser operating between 1524 nm and 1650 nm. A frequency-conversion system mixes the radiation and generates light at a frequency at or near 589 nm. A system directs the light at a frequency at or near 589 nm toward the celestial object and provides synthetic guide star generation.

  13. STUDIES ON OPTIMAL OPERATION AND CONTROL OF

    E-Print Network [OSTI]

    Skogestad, Sigurd

    this trend has been reversed. Batch distillation is becoming increasingly important as a result separation tasks. However, this type of separation requires the input of relatively large amounts of energy with high added value and greater demands for flexibility and productivity. With this renewed interest

  14. Optimization Online - Effective Strategies to Teach Operations ...

    E-Print Network [OSTI]

    Somayeh Moazeni

    2012-07-30T23:59:59.000Z

    Jul 30, 2012 ... ... business, economics, electrical engineering, civil engineering, chemical engineering, and related fields, have incorporated some topics in ...

  15. Reservoir-Stimulation Optimization with Operational Monitoring...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Testing and Development at the Raft River Geothermal Field, Idaho Creation of an Engineered Geothermal System through Hydraulic and Thermal Stimulation Desert Peak EGS Project...

  16. Optimization of the Heating System Operation 

    E-Print Network [OSTI]

    Xu, W.; Mao, S.

    2006-01-01T23:59:59.000Z

    A new regulation method of the heating system is presented, which is based on the variation of outdoor temperature, to improve the economical efficiency and the timing regulation of the heating system. A function is put forward between the energy...

  17. Convex Optimization of Centralized Inventory Operations

    E-Print Network [OSTI]

    2005-01-10T23:59:59.000Z

    Jan 10, 2005 ... Page 1 ... number of references on this topic and discuss strategies for adjusting correlations without changing individual means and variances.

  18. Smart Grid Application of Optimal Transmission Switching

    E-Print Network [OSTI]

    Ferris, Michael C.

    ;6 Introduction continued Electric Transmission Network Flow Problem Optimal Power Flow (OPF) AlternatingSmart Grid Application of Optimal Transmission Switching By, Kory W. Hedman, et al.* University (Professor, UC Berkeley) #12;2 Motivation Co-optimize transmission topology and generation dispatch

  19. Robust Methods for Engineering Design Optimization

    E-Print Network [OSTI]

    Dennis, Brian

    Random Energy Lost Generation Hybrid Example · Optimization of turbine cascade (2-D) with hybrid GA for optimized blade Hybrid Algorithms · Use a combination of algorithms plus a switching strategy for searching #12;7 Flowchart of automatic switching among modules in a hybrid optimizer Design Variance 0 DFP GA NM

  20. Optimal Power Dispatch via Multistage Stochastic Programming

    E-Print Network [OSTI]

    Römisch, Werner

    Mathematical models for cost-optimal power scheduling in hydro-thermal systems often combine several di cultiesOptimal Power Dispatch via Multistage Stochastic Programming M.P. Nowak1 and W. Romisch1 Abstract. The short-term cost-optimal dispatch of electric power in a generation sys- tem under uncertain electricity

  1. Optimization 1-1 Convex Optimization & Duality

    E-Print Network [OSTI]

    Fan, Xingzhe

    1 Optimization 1-1 Convex Optimization & Duality EEN634, Spring 2007 BASED ON LECTURES GIVEN AT MIT and Princeton Department of ECE, UMiami Optimization 1-2 #12;2 Optimization 1-3 Optimization 1-4 #12;3 Optimization 1-5 Optimization 1-6 #12;4 Optimization 1-7 Optimization 1-8 #12;5 Optimization 1-9 Optimization 1

  2. 4th Generation ECR Ion Sources

    E-Print Network [OSTI]

    Lyneis, Claude M.

    2010-01-01T23:59:59.000Z

    4th Generation ECR Ion Sources Claude M Lyneis, D. Leitner,to developing a 4 th generation ECR ion source with an RFover current 3 rd generation ECR ion sources, which operate

  3. Safe Operation of Backup Power Generators (Spanish) 

    E-Print Network [OSTI]

    Smith, David

    2006-04-19T23:59:59.000Z

    por el servicio de Extensi?n en el Internet: http://texaserc.tamu.edu Los programas educativos del Servicio de Extensi?n Agr?cola de Texas est?n disponibles para todas las personas, sin distinci?n de raza, color, sexo, minusvalidez, religi?n, edad u...

  4. Safe Operation of Backup Power Generators (Spanish)

    E-Print Network [OSTI]

    Smith, David

    2006-04-19T23:59:59.000Z

    por el servicio de Extensi?n en el Internet: http://texaserc.tamu.edu Los programas educativos del Servicio de Extensi?n Agr?cola de Texas est?n disponibles para todas las personas, sin distinci?n de raza, color, sexo, minusvalidez, religi?n, edad u...

  5. Distributed Generation Operational Reliability and Availability Database,

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:Revised Finding of No53197E T ADRAFTJanuary 2004 | Department

  6. Distributed Generation Operational Reliability, Executive Summary Report,

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:Revised Finding of No53197E T ADRAFTJanuary 2004 | DepartmentJanuary 2004 |

  7. Strong Equivalence of Qualitative Optimization Problems

    E-Print Network [OSTI]

    Faber, Wolfgang; Woltran, Stefan

    2011-01-01T23:59:59.000Z

    We introduce the framework of qualitative optimization problems (or, simply, optimization problems) to represent preference theories. The formalism uses separate modules to describe the space of outcomes to be compared (the generator) and the preferences on outcomes (the selector). We consider two types of optimization problems. They differ in the way the generator, which we model by a propositional theory, is interpreted: by the standard propositional logic semantics, and by the equilibrium-model (answer-set) semantics. Under the latter interpretation of generators, optimization problems directly generalize answer-set optimization programs proposed previously. We study strong equivalence of optimization problems, which guarantees their interchangeability within any larger context. We characterize several versions of strong equivalence obtained by restricting the class of optimization problems that can be used as extensions and establish the complexity of associated reasoning tasks. Understanding strong equiv...

  8. Optimal Power Flow Incorporating Voltage Collapse Constraints

    E-Print Network [OSTI]

    Cañizares, Claudio A.

    Optimal Power Flow Incorporating Voltage Collapse Constraints William Rosehart Claudio Ca on the current operating con- ditions is presented. Second, an Optimal Power Flow formulation that incorporates: Voltage Collapse, Optimal Power Flow, Bifur- cations. I. Introduction As open-access market principles

  9. ONLINE OPTIMIZATION AND SELECTION OF MEASUREMENTS

    E-Print Network [OSTI]

    Skogestad, Sigurd

    117 Chapter 7 ON­LINE OPTIMIZATION AND SELECTION OF MEASUREMENTS This is the last of three chapters that discuss optimal operation of a general heat exchanger network. A method that combines the use of steady state optimization and decentralized feedback control is proposed. A general steady state model

  10. Operations & Maintenance

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Operations and Maintenance Operations OASIS: OATI (Note: this site is not hosted by Western and requires a digital certificate and login for full access.) Contact Information...

  11. Operations & Maintenance

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Rates Operations & Maintenance Operations OASIS: WACM (Note: this site is not hosted by Western and requires a digital certificate and login for full access.) wesTTrans Common...

  12. Enhanced Building Operation Using "Operation Diagnostics" - A Case Study 

    E-Print Network [OSTI]

    Baumann, O.

    2005-01-01T23:59:59.000Z

    ICEBO International Conference for Enhanced Building Operations October 11-13, 2005, Pittsburgh, PA, USA Enhanced Building Operation Using ‘Operation Diagnostics’ – A Case Study Dipl.-Ing. Oliver Baumann Division for Building and System...- ing function implemented in the used visualization tool Pia [4] that enables to select and highlight data interactively in the diagram. Subsequently, numerical analysis gives the possibility to estimate optimization and saving potential...

  13. Column Generation for Extended Formulations - Optimization Online

    E-Print Network [OSTI]

    2011-07-08T23:59:59.000Z

    Jul 8, 2011 ... reformulation in order to define a good quality outer approximation of the .... extends to the case where one only has a good reformulation in an ..... by inspection. ..... the formulation is kept under control by way of managing its variables .... ming solution as a hyper-path (associated to a unit flow incoming to

  14. Optimal Model-Based Production Planning

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 Optimal Model-Based Production Planning for Refinery Operation Abdulrahman Alattas Advisor Distillation Column FI Model Conclusion #12;3 Introduction Refinery production planning models Optimizing refinery operation Crude selection Maximizing profit; minimizing cost LP-based, linear process unit

  15. Optimal Model-Based Production Planning for

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 1 Optimal Model-Based Production Planning for Refinery Operation Abdulrahman Alattas Advisor to refinery profit and economics Refinery production planning models Operation optimization Crude selection Integrate scheduling into planning model Current Project collaboration with BP Goal: develop a refinery

  16. Direct optimization overly optimizes data Kazunori Yoshizawa

    E-Print Network [OSTI]

    Yoshizawa, Kazunori

    OPINION Direct optimization overly optimizes data Kazunori Yoshizawa Systematic Entomology optimization is a criterion that recognizes sequence alignment and tree search as a single epistemological optimization criterion, all data partitions are combined and optimized simultaneously along with the same tree

  17. Cask fleet operations study

    SciTech Connect (OSTI)

    Not Available

    1988-01-01T23:59:59.000Z

    The Nuclear Waste Policy Act of 1982 assigned to the Department of Energy's (DOE) Office of Civilian Waste Management the responsibility for disposing of high-level waste and spent fuel. A significant part of that responsibility involves transporting nuclear waste materials within the federal waste management system; that is, from the waste generator to the repository. The lead responsibility for transportation operations has been assigned to Oak Ridge Operations, with Oak Ridge National Laboratory (ORNL) providing technical support through the Transportation Operations Support Task Group. One of the ORNL support activities involves assessing what facilities, equipment and services are required to assure that an acceptable, cost-effective and safe transportation operations system can be designed, operated and maintained. This study reviews, surveys and assesses the experience of Nuclear Assurance Corporation (NAC) in operating a fleet of spent-fuel shipping casks to aid in developing the spent-fuel transportation system.

  18. Performing aggressive code optimization with an ability to rollback changes made by the aggressive optimizations

    DOE Patents [OSTI]

    Gschwind, Michael K

    2013-07-23T23:59:59.000Z

    Mechanisms for aggressively optimizing computer code are provided. With these mechanisms, a compiler determines an optimization to apply to a portion of source code and determines if the optimization as applied to the portion of source code will result in unsafe optimized code that introduces a new source of exceptions being generated by the optimized code. In response to a determination that the optimization is an unsafe optimization, the compiler generates an aggressively compiled code version, in which the unsafe optimization is applied, and a conservatively compiled code version in which the unsafe optimization is not applied. The compiler stores both versions and provides them for execution. Mechanisms are provided for switching between these versions during execution in the event of a failure of the aggressively compiled code version. Moreover, predictive mechanisms are provided for predicting whether such a failure is likely.

  19. Fighting dephasing noise with robust optimal control

    E-Print Network [OSTI]

    Kevin C. Young; Dylan J Gorman; K. Birgitta Whaley

    2010-05-28T23:59:59.000Z

    We address the experimentally relevant problem of robust mitigation of dephasing noise acting on a qubit. We first present an extension of a method for representing $1/\\omega^{\\alpha}$ noise developed by Kuopanportti et al. to the efficient representation of arbitrary Markovian noise. We then add qubit control pulses to enable the design of numerically optimized, two-dimensional control functions with bounded amplitude, that are capable of decoupling the qubit from the dephasing effects of a broad variety of Markovian noise spectral densities during arbitrary one qubit quantum operations. We illustrate the method with development of numerically optimized control pulse sequences that minimize decoherence due to a combination of $1/\\omega$ and constant offset noise sources. Comparison with the performance of standard dynamical decoupling protocols shows that the numerically optimized pulse sequences are considerably more robust with respect to the noise offset, rendering them attractive for application to situations where homogeneous dephasing noise sources are accompanied by some extent of heterogeneous dephasing. Application to the mitigation of dephasing noise on spin qubits in silicon indicates that high fidelity single qubit gates are possible with current pulse generation technology.

  20. Optimization of pulsed-DEER measurements for Gd-based labels...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Optimization of pulsed-DEER measurements for Gd-based labels: choice of operational frequencies, pulse durations and positions, Optimization of pulsed-DEER measurements for...

  1. Operational Waste Volume Projection

    SciTech Connect (OSTI)

    STRODE, J.N.

    2000-08-28T23:59:59.000Z

    Waste receipts to the double-shell tank system are analyzed and wastes through the year 2015 are projected based on generation trends of the past 12 months. A computer simulation of site operations is performed, which results in projections of tank fill schedules, tank transfers, evaporator operations, tank retrieval, and aging waste tank usage. This projection incorporates current budget planning and the clean-up schedule of the Tri-Party Agreement. Assumptions were current as of June. 2000.

  2. Operational waste volume projection

    SciTech Connect (OSTI)

    Koreski, G.M.

    1996-09-20T23:59:59.000Z

    Waste receipts to the double-shell tank system are analyzed and wastes through the year 2015 are projected based on generation trends of the past 12 months. A computer simulation of site operations is performed, which results in projections of tank fill schedules, tank transfers, evaporator operations, tank retrieval, and aging waste tank usage. This projection incorporates current budget planning and the clean-up schedule of the Tri-Party Agreement. Assumptions were current as of June 1996.

  3. Optimal quantum multi-parameter estimation and application to dipole- and exchange-coupled qubits

    E-Print Network [OSTI]

    Kevin C. Young; Mohan Sarovar; Robert Kosut; K. Birgitta Whaley

    2009-06-04T23:59:59.000Z

    We consider the problem of quantum multi-parameter estimation with experimental constraints and formulate the solution in terms of a convex optimization. Specifically, we outline an efficient method to identify the optimal strategy for estimating multiple unknown parameters of a quantum process and apply this method to a realistic example. The example is two electron spin qubits coupled through the dipole and exchange interactions with unknown coupling parameters -- explicitly, the position vector relating the two qubits and the magnitude of the exchange interaction are unknown. This coupling Hamiltonian generates a unitary evolution which, when combined with arbitrary single-qubit operations, produces a universal set of quantum gates. However, the unknown parameters must be known precisely to generate high-fidelity gates. We use the Cram\\'er-Rao bound on the variance of a point estimator to construct the optimal series of experiments to estimate these free parameters, and present a complete analysis of the optimal experimental configuration. Our method of transforming the constrained optimal parameter estimation problem into a convex optimization is powerful and widely applicable to other systems.

  4. Typed Self-Optimization

    E-Print Network [OSTI]

    Brown, Matt

    2013-01-01T23:59:59.000Z

    Optimizations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 and 26. APPENDIX B Optimizations Included in thisappendix are the three optimization steps which together

  5. Investigation of optimal reactor control for a load-following PWR

    SciTech Connect (OSTI)

    Yim, M.S.

    1987-01-01T23:59:59.000Z

    Characteristics of optimal load-follow control of PWR plants are investigated in this study. A simple system model that describes main features of physical processes in the system was developed. The system model includes core neutronics with all the spatial dependent feedback effects, Xe-I dynamics, core thermal balances, primary-loop thermal balances, and steam-generator dynamic responses to turbine load changes. An optimal control problem that describes power-level control and power-distribution control problem together and considers all the important system operation limits as hard inquality constraints was formulated. The full-length control rod bank positions, part-length control rod positions, and boron concentration changes were modeled as control variables and turbine load variations were used as the forcing variable. Because modern PWR operating policy is to leave the part-length rods uninserted, the part-length rods were not used as a control variable in the optimal control calculations. The optimal control problem was converted to unconstrained nonlinear optimization problem by using the discretization approximation and the penalty function technique. The converted problem was solved by the nonlinear Gauss-Newton method which showed superior performance over all of the other tested optimization methods.

  6. Steam System Optimization

    E-Print Network [OSTI]

    Aegerter, R.

    2004-01-01T23:59:59.000Z

    opportunities. Often flanges, control valves, steam turbines, man ways, sections of piping, heads on vessels, etc. are bare and can significantly increase the steam demand. An insulation survey should be conducted of the steam, condensate... is being let down. Some projects are independent of the steam balance, such as eliminating high-pressure (HP) steam leaks, insulating HP steam piping, optimizing the boiler operation, and improving the performance of condensing turbines...

  7. Optimization of Heat Exchangers

    SciTech Connect (OSTI)

    Ivan Catton

    2010-10-01T23:59:59.000Z

    The objective of this research is to develop tools to design and optimize heat exchangers (HE) and compact heat exchangers (CHE) for intermediate loop heat transport systems found in the very high temperature reator (VHTR) and other Generation IV designs by addressing heat transfer surface augmentation and conjugate modeling. To optimize heat exchanger, a fast running model must be created that will allow for multiple designs to be compared quickly. To model a heat exchanger, volume averaging theory, VAT, is used. VAT allows for the conservation of mass, momentum and energy to be solved for point by point in a 3 dimensional computer model of a heat exchanger. The end product of this project is a computer code that can predict an optimal configuration for a heat exchanger given only a few constraints (input fluids, size, cost, etc.). As VAT computer code can be used to model characteristics )pumping power, temperatures, and cost) of heat exchangers more quickly than traditional CFD or experiment, optimization of every geometric parameter simultaneously can be made. Using design of experiment, DOE and genetric algorithms, GE, to optimize the results of the computer code will improve heat exchanger disign.

  8. OPERATIONAL RISK RODNEY COLEMAN

    E-Print Network [OSTI]

    Coleman, Rodney

    is entered into with the aim of generating wealth, in the pursuit of returns Wiley Encyclopedia of Operations, not only because losses are widely expressed in monetary terms but also since the industry is highly the loss events are penalties imposed for contravening regulations, they enter the public domain. Onetime

  9. Design of Optimal Regulators

    E-Print Network [OSTI]

    Alexander Bolonkin; Robert Sierakowski

    2007-01-19T23:59:59.000Z

    Current research suggests the use of a liner quadratic performance index for optimal control of regulators in various applications. Some examples include correcting the trajectory of rocket and air vehicles, vibration suppression of flexible structures, and airplane stability. In all these cases, the focus is in suppressing/decreasing system deviations rapidly. However, if one compares the Linear Quadratic Regulator (LQR) solution with optimal solutions (minimum time), it is seen that the LQR solution is less than optimal in some cases indeed (3-6) times that obtained using a minimum time solution. Moreover, the LQR solution is sometimes unacceptable in practice due to the fact that values of control extend beyond admissible limits and thus the designer must choose coefficients in the linear quadratic form, which are unknown. The authors suggest methods which allow finding a quasi-optimal LQR solution with bounded control which is closed to the minimum time solution. They also remand the process of the minimum time decision. Keywords: Optimal regulator, minimum time controller, Linear Quadratic Regulator (LQR). -- This paper is declared a work of the U.S. Government and not subject to copyright protection in the USA. The manuscript is accepted as paper AIAA-2003-6638 by 2nd AIAA Unmanned Unlimited Systems, Technologies, and Operations-Aerospace, Land, and See Conference and Workshop - Exhibit, San Diego, California, USA, 15-18 Sep. 2003.

  10. Geometric numerical integration of nonholonomic systems and optimal control problems

    E-Print Network [OSTI]

    M. de Leon; D. Martin de Diego; A. Santamaria Merino

    2002-12-02T23:59:59.000Z

    A geometric derivation of numerical integrators for nonholonomic systems and optimal control problems is obtained. It is based in the classical technique of generating functions adapted to the special features of nonholonomic systems and optimal control problems.

  11. Real-Time Optimization Strategies for Building Systems

    E-Print Network [OSTI]

    2011-09-02T23:59:59.000Z

    Optimization-based control is a key technology in next-generation building systems. ... For instance, many optimization studies assume that demand shifting is the ...... While demand response programs can provide a financial incentive, current ...

  12. Supplement Analysis for the Site-Wide Environmental Impact Statement for Continued Operation of Los Alamos National Laboratory -- Recovery and Storage of Strontium-90 Fueled Radioisotope Thermal Electric Generators at Los Alamos National Laboratory

    SciTech Connect (OSTI)

    N /A

    2004-01-22T23:59:59.000Z

    This Supplement Analysis (SA) has been prepared to determine if the Site-Wide Environmental Impact Statement for Continued Operations of Los Alamos National Laboratory (SWEIS) (DOE/EIS-0238) adequately addresses the environmental effects of recovery and storage for disposal of six strontium-90 (Sr-90) fueled radioisotope thermal electric generators (RTGs) at the Los Alamos National Laboratory (LANL) Technical Area (TA)-54, Area G, or if the SWEIS needs to be supplemented. DOE's National Nuclear Security Administration (NNSA) proposed to recover and store six Sr-90 RTGs from the commercial sector as part of its Offsite-Source Recovery Project (OSRP). The OSRP focuses on the proactive recovery and storage of unwanted radioactive sealed sources exceeding the US Nuclear Regulatory Commission (NRC) limits for Class C low-level waste (also known as Greater than Class C waste, or GTCC). In response to the events of September 11, 2001, NRC conducted a risk-based evaluation of potential vulnerabilities to terrorist threats involving NRC-licensed nuclear facilities and materials. NRC's evaluation concluded that possession of unwanted radioactive sealed sources with no disposal outlet presents a potential vulnerability (NRC 2002). In a November 25, 2003 letter to the manager of the NNSA's Los Alamos Site Office, the NRC Office of Nuclear Security and Incident Response identified recovery of several Sr-90 RTGs as the highest priority and requested that DOE take whatever actions necessary to recovery these sources as soon as possible. This SA specifically compares key impact assessment parameters of this proposal to the offsite source recovery program evaluated in the SWEIS and a subsequent SA that evaluated a change to the approach of a portion of the recovery program. It also provides an explanation of any differences between the Proposed Action and activities described in the previous SWEIS and SA analyses.

  13. The Use of Exhaust Gas Recirculation to Optimize Fuel Economy...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    The Use of Exhaust Gas Recirculation to Optimize Fuel Economy and Minimize Emissions in Engines Operating on E85 Fuel The Use of Exhaust Gas Recirculation to Optimize Fuel Economy...

  14. Process and Energy Optimization Revitalizes Energy Management at Eastman

    E-Print Network [OSTI]

    Greenwaldt, W. C.

    2007-01-01T23:59:59.000Z

    In 2005, the Eastman-Texas Operations Energy Management Team (EMT), in response to rapidly increasing energy prices, initiated a new energy optimization program to optimize the site’s energy intensity. This new program utilized a process and energy...

  15. Optimal Sequencing of Central Refrigeration Equipment in an Industrial Plant

    E-Print Network [OSTI]

    Fiorino, D. P.; Priest, J. W.

    1986-01-01T23:59:59.000Z

    A model was developed to find a viable solution to the problem of selecting the optimal sequence of refrigeration equipment (chillers, cooling towers, pumps) to operate in a Central Utility Plant. The optimal equipment sequence is that sequence...

  16. Optimization Online - Nonlinear Optimization Submissions - 2012

    E-Print Network [OSTI]

    Sonia Cafieri, Alberto Costa, Pierre Hansen. February 2012. Unconstrained Optimization Smoothing SQP Algorithm for Non-Lipschitz Optimization with ...

  17. Optimization Online - Nonlinear Optimization Submissions - 2003

    E-Print Network [OSTI]

    Optimization Online is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  18. Optimization Online - Nonlinear Optimization Submissions - 2001

    E-Print Network [OSTI]

    Optimization Online is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  19. Optimization Online - Global Optimization Submissions - 2007

    E-Print Network [OSTI]

    Optimization Online is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  20. Optimization Online - Global Optimization Submissions - 2001

    E-Print Network [OSTI]

    Optimization Online is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  1. Optimization Online - Nonlinear Optimization Submissions - 2000

    E-Print Network [OSTI]

    Optimization Online is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  2. Optimization Online - Combinatorial Optimization Submissions - 2002

    E-Print Network [OSTI]

    Optimization Online is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  3. Thermodynamic optimization of heat-driven refrigerators in the transient regime

    SciTech Connect (OSTI)

    Vargas, J.V.C.; Parise, J.A.R.; Ledezma, G.A.; Bianchi, M.V.A.

    2000-02-01T23:59:59.000Z

    The present work introduces a transient endoreversible model of a heat-driven refrigeration plant, which is driven by a fuel-burning heater. The model consists of a combustion chamber with negligible heat loss to the ambient, a refrigerator with three finite-size heat exchangers, namely, the evaporator between the refrigeration load and refrigerant, the condenser between the refrigerant and the ambient, and the generator between the combustion chamber and the refrigerant, and finally the refrigerated space. The total thermal conductance of the three heat exchangers is fixed. A thermodynamic optimization of the absorption cycle is then performed, reporting the operating conditions for minimum time to reach a prescribed cold-space temperature, thus maximum refrigeration rate, specifically, the optimal mass fuel flow rate and the optimal way of allocating the thermal conductance inventory. Half of the total supply of thermal conductance has to be divided equally between the generator and evaporator and the other half allocated to the condenser, for optimal operation. A narrow range of fuel flow rates lead to the minimum time to achieve a prescribed cold-space temperature, thus stressing the importance of the transient analysis. Appropriate dimensionless groups were identified and the generalized results are reported in dimensionless charts.

  4. Lazy Parallelization: A Finite State Machine Based Optimization Approach for Data Parallel Image Processing Applications

    E-Print Network [OSTI]

    Seinstra, Frank J.

    performance image processing applications is often sub-optimal. This is be- cause inter-operation optimization performance optimization to each library operation in isolation, and ignore global opti- mization for fullLazy Parallelization: A Finite State Machine Based Optimization Approach for Data Parallel Image

  5. New Jersey Nuclear Profile - PSEG Salem Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    PSEG Salem Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License...

  6. California Nuclear Profile - San Onofre Nuclear Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    San Onofre Nuclear Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License...

  7. New Jersey Nuclear Profile - PSEG Hope Creek Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    PSEG Hope Creek Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License...

  8. Illinois Nuclear Profile - LaSalle Generating Station

    U.S. Energy Information Administration (EIA) Indexed Site

    LaSalle Generating Station" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration...

  9. Fuel Efficiency and Emissions Optimization of Heavy-Duty Diesel...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    More Documents & Publications Model-Based Transient Calibration Optimization for Next Generation Diesel Engines Demonstrating Fuel Consumption and Emissions Reductions with...

  10. Optimized Triple-Junction Solar Cells Using Inverted Metamorphic Approach (Presentation)

    SciTech Connect (OSTI)

    Geisz, J. F.

    2008-11-01T23:59:59.000Z

    Record efficiencies with triple-junction inverted metamorphic designs, modeling useful to optimize, and consider operating conditions before choosing design.

  11. Utrecht University Close Co-operation

    E-Print Network [OSTI]

    Utrecht, Universiteit

    Utrecht University Close Co-operation #12;1 CloseCo-operation Preface 3 TheNextGeneration 18 Facts&Figures 20 Faculty Humanities 4 Faculty Geosciences 6 Faculty Medicine/UniversityMedicalCenter Utrecht 8 VeterinaryMedicine 16 Contents Utrecht University CloseCo-operation #12;3 CloseCo-operation It is a great

  12. Distributed Generation Investment by a Microgrid under Uncertainty

    E-Print Network [OSTI]

    Siddiqui, Afzal

    2008-01-01T23:59:59.000Z

    L, editor. 11 th Annual Real Options Conference, Berkeley,from its utility. Using the real options approach, we find aDistributed Generation; Real Options; Optimal Investment;

  13. Distributed Generation Investment by a Microgrid Under Uncertainty

    E-Print Network [OSTI]

    Siddiqui, Afzal; Marnay, Chris

    2006-01-01T23:59:59.000Z

    utility. Using the real options approach, we find naturalDistributed Generation; Real Options; Optimal Investment. 1.based microgrid via the real options approach to determine

  14. Convergent relaxations of polynomial optimization problems with ...

    E-Print Network [OSTI]

    2010-01-11T23:59:59.000Z

    These non-commuting variables are viewed as bounded operators on a .... i , where ? denotes the adjoint operation on ...... Polynomials in hermitian variables are elements of the free ?-algebra K[x] with generators .... In particular, the speed of.

  15. An Approximate Inference Approach to Temporal Optimization in Optimal Control

    E-Print Network [OSTI]

    Vijayakumar, Sethu

    ­ Motivation · Stochastic Optimal feedback control (SOFC) is a plausible move- ment generation strategy in goal with non-linear dynamics and non-quadratic costs SOFC law can only be found locally and iteratively, e ­ SOFC Model Random variables we use here: xt state of a plant (joint angles q and velocities q) ut

  16. BEopt: Software for Identifying Optimal Building Designs on the Path to Zero Net Energy; Preprint

    SciTech Connect (OSTI)

    Christensen, C.; Horowitz, S.; Givler, T.; Courtney, A.; Barker, G.

    2005-04-01T23:59:59.000Z

    A zero net energy (ZNE) building produces as much energy on-site as it uses on an annual basis--using a grid-tied, net-metered photovoltaic (PV) system and active solar. The optimal path to ZNE extends from a base case to the ZNE building through a series of energy-saving building designs with minimal energy-related owning and operating costs. BEopt is a computer program designed to find optimal building designs along the path to ZNE. A user selects from among predefined options in various categories to specify options to be considered in the optimization. Energy savings are calculated relative to a reference. The reference can be either a user-defined base-case building or a climate-specific Building America Benchmark building automatically generated by BEopt. The user can also review and modify detailed information on all available options and the Building America Benchmark in a linked options library spreadsheet.

  17. Adaptive Optimal Control for Redundantly Actuated Arms 

    E-Print Network [OSTI]

    Mitrovic, Djordje; Klanke, Stefan; Vijayakumar, Sethu

    2008-01-01T23:59:59.000Z

    Optimal feedback control has been proposed as an attractive movement generation strategy in goal reaching tasks for anthropomorphic manipulator systems. Recent developments, such as the iterative Linear Quadratic Gaussian ...

  18. Optimization Online - All Areas Submissions - March 2008

    E-Print Network [OSTI]

    ... a semidefinite programming solver based on CSDP on a distributed memory cluster ... Tractable Robust Expected Utility and Risk Models for Portfolio Optimization ... Epi-convergent Scenario Generation Method for Stochastic Problems via ...

  19. Embedded Online Optimization for Model Predictive Control at ...

    E-Print Network [OSTI]

    2013-03-05T23:59:59.000Z

    optimization-based control systems on low cost embedded platforms. ..... Modern computing platforms must allow for a wide range of applications that operate on.

  20. The Use of Exhaust Gas Recirculation to Optimize Fuel Economy...

    Broader source: Energy.gov (indexed) [DOE]

    Use of Exhaust Gas Recirculation to Optimize Fuel Economy and Minimize Emissions in Engines Operating on E85 Fuel Quarterly Biomass ProgramClean Cities State Web Conference:...

  1. Gas Network Optimization: A comparison of Piecewise Linear Models

    E-Print Network [OSTI]

    2014-06-22T23:59:59.000Z

    Gas network optimization manages the gas transport by minimizing operating costs and .... This problem represents the transportation process of natural gas. 79.

  2. Optimization of Cylindrical Hall Thrusters

    SciTech Connect (OSTI)

    Yevgeny Raitses, Artem Smirnov, Erik Granstedt, and Nathaniel J. Fi

    2007-07-24T23:59:59.000Z

    The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized cylindrical thrusters led to performance improvements in the 50-200W input power range, including plume narrowing, increased thruster efficiency, reliable discharge initiation, and stable operation. __________________________________________________

  3. Optimization of Cylindrical Hall Thrusters

    SciTech Connect (OSTI)

    Yevgeny Raitses, Artem Smirnov, Erik Granstedt, and Nathaniel J. Fisch

    2007-11-27T23:59:59.000Z

    The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized cylindrical thrusters led to performance improvements in the 50-200W input power range, including plume narrowing, increased thruster efficiency, reliable discharge initiation, and stable operation.

  4. A methodology for optimal MSW management, with an application in the waste transportation of Attica Region, Greece

    SciTech Connect (OSTI)

    Economopoulou, M.A. [Hellenic Statistical Authority, Pireos 46 and Eponiton, Pireus 185 10 (Greece); Economopoulou, A.A. [Ministry of Environment, Energy and Climatic Change, 15 Amaliados Street, Athens 11523 (Greece); Economopoulos, A.P., E-mail: eco@otenet.gr [Environmental Engineering Dept., Technical University of Crete, Chania 73100 (Greece)

    2013-11-15T23:59:59.000Z

    Highlights: • A two-step (strategic and detailed optimal planning) methodology is used for solving complex MSW management problems. • A software package is outlined, which can be used for generating detailed optimal plans. • Sensitivity analysis compares alternative scenarios that address objections and/or wishes of local communities. • A case study shows the application of the above procedure in practice and demonstrates the results and benefits obtained. - Abstract: The paper describes a software system capable of formulating alternative optimal Municipal Solid Wastes (MSWs) management plans, each of which meets a set of constraints that may reflect selected objections and/or wishes of local communities. The objective function to be minimized in each plan is the sum of the annualized capital investment and annual operating cost of all transportation, treatment and final disposal operations involved, taking into consideration the possible income from the sale of products and any other financial incentives or disincentives that may exist. For each plan formulated, the system generates several reports that define the plan, analyze its cost elements and yield an indicative profile of selected types of installations, as well as data files that facilitate the geographic representation of the optimal solution in maps through the use of GIS. A number of these reports compare the technical and economic data from all scenarios considered at the study area, municipality and installation level constituting in effect sensitivity analysis. The generation of alternative plans offers local authorities the opportunity of choice and the results of the sensitivity analysis allow them to choose wisely and with consensus. The paper presents also an application of this software system in the capital Region of Attica in Greece, for the purpose of developing an optimal waste transportation system in line with its approved waste management plan. The formulated plan was able to: (a) serve 113 Municipalities and Communities that generate nearly 2 million t/y of comingled MSW with distinctly different waste collection patterns, (b) take into consideration several existing waste transfer stations (WTS) and optimize their use within the overall plan, (c) select the most appropriate sites among the potentially suitable (new and in use) ones, (d) generate the optimal profile of each WTS proposed, and (e) perform sensitivity analysis so as to define the impact of selected sets of constraints (limitations in the availability of sites and in the capacity of their installations) on the design and cost of the ensuing optimal waste transfer system. The results show that optimal planning offers significant economic savings to municipalities, while reducing at the same time the present levels of traffic, fuel consumptions and air emissions in the congested Athens basin.

  5. A Communication-Optimal Framework for Contracting Distributed Tensors

    SciTech Connect (OSTI)

    Rajbhandari, Samyam; NIkam, Akshay; Lai, Pai-Wei; Stock, Kevin; Krishnamoorthy, Sriram; Sadayappan, Ponnuswamy

    2014-11-16T23:59:59.000Z

    Tensor contractions are extremely compute intensive generalized matrix multiplication operations encountered in many computational science fields, such as quantum chemistry and nuclear physics. Unlike distributed matrix multiplication, which has been extensively studied, limited work has been done in understanding distributed tensor contractions. In this paper, we characterize distributed tensor contraction algorithms on torus networks. We develop a framework with three fundamental communication operators to generate communication-efficient contraction algorithms for arbitrary tensor contractions. We show that for a given amount of memory per processor, our framework is communication optimal for all tensor contractions. We demonstrate performance and scalability of our framework on up to 262,144 cores of BG/Q supercomputer using five tensor contraction examples.

  6. Fast K System Generators of Pseudorandom Numbers

    E-Print Network [OSTI]

    Akopov, N Z; Nersessian, A B; Savvidy, G K; Greiner, W

    1993-01-01T23:59:59.000Z

    We suggest fast algorithm for the matrix generator of pseudorandom numbers based on Kolmogorov-Anosov K systems which has been earliar proposed in \\cite{savvidy1,akopov1}. This algorithm reduces $N^{2}$ operation of the matrix generator to $NlnN$ and essentially reduces the generation time. It also clarifies the algebraic structure of this type of K system generators.

  7. Fast K System Generators of Pseudorandom Numbers

    E-Print Network [OSTI]

    N. Z. Akopov; E. M. Madounts; A. B. Nersesian; G. K. Savvidy; W. Greiner

    1993-11-19T23:59:59.000Z

    We suggest fast algorithm for the matrix generator of pseudorandom numbers based on Kolmogorov-Anosov K systems which has been earliar proposed in \\cite{savvidy1,akopov1}. This algorithm reduces $N^{2}$ operation of the matrix generator to $NlnN$ and essentially reduces the generation time. It also clarifies the algebraic structure of this type of K system generators.

  8. Method for protecting an electric generator

    DOE Patents [OSTI]

    Kuehnle, Barry W. (Ammon, ID); Roberts, Jeffrey B. (Ammon, ID); Folkers, Ralph W. (Ammon, ID)

    2008-11-18T23:59:59.000Z

    A method for protecting an electrical generator which includes providing an electrical generator which is normally synchronously operated with an electrical power grid; providing a synchronizing signal from the electrical generator; establishing a reference signal; and electrically isolating the electrical generator from the electrical power grid if the synchronizing signal is not in phase with the reference signal.

  9. Optimal experiment design for time-lapse traveltime tomography

    SciTech Connect (OSTI)

    Ajo-Franklin, J.B.

    2009-10-01T23:59:59.000Z

    Geophysical monitoring techniques offer the only noninvasive approach capable of assessing both the spatial and temporal dynamics of subsurface fluid processes. Increasingly, permanent sensor arrays in boreholes and on the ocean floor are being deployed to improve the repeatability and increase the temporal sampling of monitoring surveys. Because permanent arrays require a large up-front capital investment and are difficult (or impossible) to re-configure once installed, a premium is placed on selecting a geometry capable of imaging the desired target at minimum cost. We present a simple approach to optimizing downhole sensor configurations for monitoring experiments making use of differential seismic traveltimes. In our case, we use a design quality metric based on the accuracy of tomographic reconstructions for a suite of imaging targets. By not requiring an explicit singular value decomposition of the forward operator, evaluation of this objective function scales to problems with a large number of unknowns. We also restrict the design problem by recasting the array geometry into a low dimensional form more suitable for optimization at a reasonable computational cost. We test two search algorithms on the design problem: the Nelder-Mead downhill simplex method and the Multilevel Coordinate Search algorithm. The algorithm is tested for four crosswell acquisition scenarios relevant to continuous seismic monitoring, a two parameter array optimization, several scenarios involving four parameter length/offset optimizations, and a comparison of optimal multi-source designs. In the last case, we also examine trade-offs between source sparsity and the quality of tomographic reconstructions. One general observation is that asymmetric array lengths improve localized image quality in crosswell experiments with a small number of sources and a large number of receivers. Preliminary results also suggest that high-quality differential images can be generated using only a small number of optimally positioned sources.

  10. Interconnection networks synthesis and optimization

    E-Print Network [OSTI]

    Zhu, Yi

    2008-01-01T23:59:59.000Z

    Synthesis and Optimization . . . . . . . . . . .1.Wire Style Optimization . . . . . . . . . . . . . B. PowerSynthesis and Optimization . 1. Overview . . . . . . . . . .

  11. Relaying and Controls for Generator Applications

    E-Print Network [OSTI]

    Massey, G. W.

    this transfer. The following pages outline the options available for Federal Bureau ofPrisons Kansas City, Kansas generator selection and operation, the common relays used for generator protection and control, and the minimum recommended control... and the sequence ofoperation for the generator system. The next section will discuss relays typically used in controlling and protecting the generator during normal and abnormal operating conditions. COMMONLY APPLIED PROTECfIVE AND CONTROL RELAYS Relays...

  12. Optimizing Natural Gas Use: A Case Study

    E-Print Network [OSTI]

    Venkatesan, V. V.; Schweikert, P.

    2007-01-01T23:59:59.000Z

    Optimization of Steam & Energy systems in any continuously operating process plant results in substantial reduction in Natural gas purchases. During periods of natural gas price hikes, this would benefit the plant to control their fuel budget...

  13. Modeling Variability and Uncertainty of Photovoltaic Generation: A Hidden State Spatial Statistical Approach

    E-Print Network [OSTI]

    Callaway, Duncan S; Tabone, Michaelangelo D

    2015-01-01T23:59:59.000Z

    Operational im- pacts of wind generation on California poweralong with all solar and wind generation) is different thanincreases in wind and solar generation—see those cited

  14. Soliton molecules: Experiments and optimization

    SciTech Connect (OSTI)

    Mitschke, Fedor [Universität Rostock, Institut für Physik, Universitätsplatz 3, 18051 Rostock (Germany)

    2014-10-06T23:59:59.000Z

    Stable compound states of several fiber-optic solitons have recently been demonstrated. In the first experiment their shape was approximated, for want of a better description, by a sum of Gaussians. Here we discuss an optimization strategy which helps to find preferable shapes so that the generation of radiative background is reduced.

  15. Stratified vapor generator

    DOE Patents [OSTI]

    Bharathan, Desikan (Lakewood, CO); Hassani, Vahab (Golden, CO)

    2008-05-20T23:59:59.000Z

    A stratified vapor generator (110) comprises a first heating section (H.sub.1) and a second heating section (H.sub.2). The first and second heating sections (H.sub.1, H.sub.2) are arranged so that the inlet of the second heating section (H.sub.2) is operatively associated with the outlet of the first heating section (H.sub.1). A moisture separator (126) having a vapor outlet (164) and a liquid outlet (144) is operatively associated with the outlet (124) of the second heating section (H.sub.2). A cooling section (C.sub.1) is operatively associated with the liquid outlet (144) of the moisture separator (126) and includes an outlet that is operatively associated with the inlet of the second heating section (H.sub.2).

  16. Distributed Generation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    at customer sites to address peak load. 2 Using these resources could reduce required installed capacity and would increase the operating reserve margins for the network,...

  17. Fuzzy Optimality and Evolutionary Multiobjective Optimization

    E-Print Network [OSTI]

    Coello, Carlos A. Coello

    Fuzzy Optimality and Evolutionary Multiobjective Optimization M. Farina and P. Amato. Pareto optimality is someway ineffective for optimization problems with several (more than three) objectives. In fact the Pareto optimal set tends to become a wide portion of the whole design domain search

  18. Optimization of Logic Programs with Dynamic Scheduling

    E-Print Network [OSTI]

    Stuckey, Peter J.

    of program transformations designed to reduce this additional over­ head, while preserving the operational using high­level program transformation was already illustrated in [?]. However, optimizationOptimization of Logic Programs with Dynamic Scheduling Germ'an Puebla Facultad de Inform

  19. APPROXIMATE DYNAMIC PROGRAMMING FOR OPTIMIZING OIL

    E-Print Network [OSTI]

    Van Roy, Ben

    In this chapter, a new ADP algorithm integrating (1) systematic basis function con- struction, (2) a linear op- timization techniques to improve the performance of petroleum reservoir operations. Many optimization algorithms have been applied to maximize reservoir performance. Most of these optimization

  20. Chemical Reactor Analysis and Optimal Digestion

    E-Print Network [OSTI]

    Jumars, Pete

    J 310 Chemical Reactor Analysis and Optimal Digestion An optimal digestion theory can be readily derived from basic principles o f chemical reactor analysis and design Deborah L. Penry and Peter a reactor and an operating strategy that maximize the yield or yield rate of desired reaction products