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Wind Turbine Gearbox Failure Modes - A Brief

Description: Wind turbine gearboxes are not always meeting 20-year design life. Premature failure of gearboxes increases cost of energy, turbine downtime, unplanned maintenance, gearbox replacement and rebuild, and increased warranty reserves. The problem is widespread, affects most Original Equipment Manufacturers, and is not caused by manufacturing practices. There is a need to improve gearbox reliability and reduce turbine downtime. The topics of this presentation are: GRC (Gearbox Reliability Collaborat… more
Date: October 1, 2011
Creator: Sheng, S.; McDade, M. & Errichello, R.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Allocating Variability and Reserve Requirements

Description: This presentation describes how you could conceivably allocate variability and reserve requirements, including how to allocate aggregation benefits. Conclusions of this presentation are: (1) Aggregation provides benefits because individual requirements are not 100% correlated; (2) Method needed to allocate reduced requirement among participants; (3) Differences between allocation results are subtle - (a) Not immediately obvious which method is 'better'; (b) Many are numerically 'correct', they … more
Date: October 1, 2011
Creator: Kirby, B.; King, J. & Milligan, M.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Module Technology: Current Practice and Issues

Description: PV modules must provide mechanical support for the cells, protect the world from the voltages inside, protect the cells, diodes and interconnects from the weather outside, couple as much light as possible into the PV cells and minimize the temperature increase of the cells. The package must continue to serve these functions for at least 25 years as that is the typical module warranty period today. Furthermore the package must do all this for as low a cost as possible since the key to large scal… more
Date: October 5, 2010
Creator: Wohlgemuth, J.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Renewable Electricity Futures

Description: This presentation library summarizes findings of NREL's Renewable Electricity Futures study, published in June 2012. RE Futures investigated the challenges and impacts of achieving very high renewable electricity generation levels in the contiguous United States by 2050. It is being presented at the Utility Variable-Generation Integration Group Fall Technical Workshop on October 24, 2012.
Date: October 1, 2012
Creator: Hand, M. Maureen
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Scripted Building Energy Modeling and Analysis

Description: Building energy analysis is often time-intensive, error-prone, and non-reproducible. Entire energy analyses can be scripted end-to-end using the OpenStudio Ruby API. Common tasks within an analysis can be automated using OpenStudio Measures. Graphical user interfaces (GUI's) and component libraries reduce time, decrease errors, and improve repeatability in energy modeling.
Date: October 1, 2012
Creator: Macumber, D.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

NREL Variability and Reserves Analysis for the Western Interconnect

Description: Additional variability and uncertainty increase reserve requirements. In this light, this presentation discusses how use of generation reserves can be optimized for managing variability and uncertainty. Conclusions of this presentation are: (1) Provided a method for calculating additional reserve requirements due to wind and solar production; (2) Method is based on statistical analysis of historical time series data; (3) Reserves are dynamic, produced for each hour; (4) Reserve time series are … more
Date: October 1, 2011
Creator: Milligan, M. & King, J.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Renewable Electricity Futures

Description: This presentation library summarizes findings of NREL's Renewable Electricity Futures study, published in June 2012. RE Futures investigated the challenges and impacts of achieving very high renewable electricity generation levels in the contiguous United States by 2050.
Date: October 1, 2012
Creator: Mai, Trieu
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Technology and Climate Trends in PV Module Degradation

Description: To sustain the commercial success of photovoltaic (PV) technology it is vital to know how power output decreases with time. Unfortunately, it can take years to accurately measure the long-term degradation of new products, but past experience on older products can provide a basis for prediction of degradation rates of new products. An extensive search resulted in more than 2000 reported degradation rates with more than 1100 reported rates that include some or all IV parameters. In this presentat… more
Date: October 1, 2012
Creator: Jordan, D.; Wohlgemuth, J. & Kurtz, S.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

U.S. Balance-of-Station Cost Drivers and Sensitivities

Description: With balance-of-system (BOS) costs contributing up to 70% of the installed capital cost, it is fundamental to understanding the BOS costs for offshore wind projects as well as potential cost trends for larger offshore turbines. NREL developed a BOS model using project cost estimates developed by GL Garrad Hassan. Aspects of BOS covered include engineering and permitting, ports and staging, transportation and installation, vessels, foundations, and electrical. The data introduce new scaling rela… more
Date: October 1, 2012
Creator: Maples, B.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
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