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Accelerating Computation of the Unit Commitment Problem

Description: Production cost models (PCMs) simulate power system operation at hourly (or higher) resolution. While computation times often extend into multiple days, the sequential nature of PCM's makes parallelism difficult. We exploit the persistence of unit commitment decisions to select partition boundaries for simulation horizon decomposition and parallel computation. Partitioned simulations are benchmarked against sequential solutions for optimality and computation time.
Date: October 1, 2013
Creator: Hummon, M.; Barrows, C. & Jones, W.

Accelerating Fatigue Testing for Cu Ribbon Interconnects

Description: This presentation describes fatigue experiments and discusses dynamic mechanical loading for Cu ribbon interconnects.
Date: May 1, 2013
Creator: Bosco, N.; Silverman, T.; Wohlgemuth , J.; Kurtz, S.; Inoue, M.; Sakurai, K. et al.

Accounting for the Variation of Driver Aggression in the Simulation of Conventional and Advanced Vehicles

Description: This presentation discusses a method of accounting for realistic levels of driver aggression to higher-level vehicle studies, including the impact of variation in real-world driving characteristics (acceleration and speed) on vehicle energy consumption and different powertrains (e.g., conventionally powered vehicles versus electrified drive vehicles [xEVs]). Aggression variation between drivers can increase fuel consumption by more than 50% or decrease it by more than 20% from average. The norm… more
Date: May 1, 2013
Creator: Neubauer, J. & Wood, E.

Adding Complex Terrain and Stable Atmospheric Condition Capability to the Simulator for On/Offshore Wind Farm Applications (SOWFA)

Description: This presentation describes changes made to NREL's OpenFOAM-based wind plant aerodynamics solver so that it can compute the stably stratified atmospheric boundary layer and flow over terrain. Background about the flow solver, the Simulator for Off/Onshore Wind Farm Applications (SOWFA) is given, followed by details of the stable stratification/complex terrain modifications to SOWFA, along with some preliminary results calculations of a stable atmospheric boundary layer and flow over a simple se… more
Date: June 1, 2013
Creator: Churchfield, M. J.

Alternative Fuels Market and Policy Trends

Description: Market forces and policies are increasing opportunities for alternative fuels. There is no one-size-fits-all, catch-all, silver-bullet fuel. States play a critical role in the alternative fuel market and are taking a leading role.
Date: September 1, 2013
Creator: Schroeder, A. N.

An Analysis of Concentrating Solar Power with Thermal Energy Storage in a California 33% Renewable Scenario (Report Summary)

Description: This analysis evaluates CSP with TES in a scenario where California derives 33% of its electricity from renewable energy sources. It uses a commercial grid simulation tool to examine the avoided operational and capacity costs associated with CSP and compares this value to PV and a baseload generation with constant output. Overall, the analysis demonstrates several properties of dispatchable CSP, including the flexibility to generate during periods of high value and avoid generation during perio… more
Date: April 1, 2013
Creator: Denholm, P.; Wan, Y. H.; Hummon, M. & Mehos, M.

Analysis of Variability and Uncertainty in Wind Power Forecasting: An International Comparison

Description: This presentation summarizes the work to investigate the uncertainty in wind forecasting at different times of year and compare wind forecast errors in different power systems using large-scale wind power prediction data from six countries: the United States, Finland, Spain, Denmark, Norway, and Germany.
Date: October 1, 2013
Creator: Zhang, J.; Hodge, B.; Miettinen, J.; Holttinen, H.; Gomez-Lozaro, E.; Cutululis, N. et al.

Analyzing the Effects of Climate and Thermal Configuration on Community Energy Storage Systems

Description: Community energy storage (CES) has been proposed to mitigate the high variation in output from renewable sources and reduce peak load on the electrical grid. Thousands of these systems may be distributed around the grid to provide benefits to local distribution circuits and to the grid as a whole when aggregated. CES must be low cost to purchase and install and also largely maintenance free through more than 10 years of service life to be acceptable to most utilities.Achieving the required syst… more
Date: October 1, 2013
Creator: Neubauer, J.; Pesaran, A.; Coleman, D. & Chen, D.

Building Toward a Small Wind Turbine Site Assessor Credential

Description: Proper site assessment is integral to the development of a successful small wind project. Without a small wind site assessor certification program, consumers, including state incentive program managers, lack a benchmark for differentiating between qualified and nonqualified site assessors. A small wind site assessor best practice manual is being developed as a resource for consumers until a credential program becomes available. This presentation describes the purpose, proposed content, and the … more
Date: September 1, 2013
Creator: Sinclair, K.

Built Environment Energy Analysis Tool Overview

Description: This presentation provides an overview of the Built Environment Energy Analysis Tool, which is designed to assess impacts of future land use/built environment patterns on transportation-related energy use and greenhouse gas (GHG) emissions. The tool can be used to evaluate a range of population distribution and urban design scenarios for 2030 and 2050. This tool was produced as part of the Transportation Energy Futures (TEF) project, a Department of Energy-sponsored multi-agency project initiat… more
Date: April 1, 2013
Creator: Porter, C.

Clean Energy Finance: Challenges and Opportunities of Early-Stage Energy Investing

Description: Characterized by a changing landscape and new opportunities, today's increasingly complex energy decision space will need innovative financing and investment models to appropriately assess risk and profitability. This report provides an overview of the current state of clean energy finance across the entire spectrum but with a focus on early stage investing, and it includes insights from investors across all investment classes. Further, this report aims to provide a roadmap with the mechanisms,… more
Date: December 1, 2013
Creator: Heap, D.; Pless, J. & Aieta, N.

A Comparison of Supercritical Carbon Dioxide Power Cycle Configurations with an Emphasis on CSP Applications

Description: Recent research suggests that an emerging power cycle technology using supercritical carbon dioxide (s-CO2) operated in a closed-loop Brayton cycle offers the potential of equivalent or higher cycle efficiency versus supercritical or superheated steam cycles at temperatures relevant for CSP applications. Preliminary design-point modeling suggests that s-CO2 cycle configurations can be devised that have similar overall efficiency but different temperature and/or pressure characteristics. This pa… more
Date: September 1, 2013
Creator: Neises, T. & Turchi, C.

Computational Tools for Accelerating Carbon Capture Process Development

Description: This presentation reports development of advanced computational tools to accelerate next generation technology development. These tools are to develop an optimized process using rigorous models. They include: Process Models; Simulation-Based Optimization; Optimized Process; Uncertainty Quantification; Algebraic Surrogate Models; and Superstructure Optimization (Determine Configuration).
Date: June 4, 2013
Creator: Miller, David; Sahinidis, N.V,; Cozad, A; Lee, A; Kim, H; Morinelly, J. et al.

Constraining GPDs at Jefferson Lab

Description: This slide-show presents work on DeeplyVirtual Compton Scattering(DVCS), DeeplyVirtual MesonProduction (DVMP), and the GPD program atJLab12 GeV.
Date: October 1, 2013
Creator: Jo, Hyon-Suk

Coordinating Permit Offices and the Development of Utility-Scale Geothermal Energy

Description: Permitting is a major component of the geothermal development process. Better coordination across government agencies could reduce uncertainty of the process and the actual time of permitting. This presentation highlights various forms of coordinating permit offices at the state and federal level in the western United States, discusses inefficiencies and mitigation techniques for permitting natural resource projects, analyzes whether various approaches are easily adaptable to utility-scale geot… more
Date: October 1, 2013
Creator: Levine, A.; Young, K. & Witherbee, K.

Current State of the Voluntary Renewable Energy Market

Description: This presentation highlights the status of the voluntary green power market in 2012. The voluntary green power market totaled more than 48 million MWh in 2012, with about 1.9 million customers participating. The supply continues to be dominated by wind, though solar is increasing its share of utility green pricing programs. Prices for voluntary renewable energy certificates (RECs) increased to above $1/MWh.
Date: September 1, 2013
Creator: Heeter, J.
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