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J.", "lastName": "Churchfield" }, { "creatorType": "author", "firstName": "P. J.", "lastName": "Moriarty" }, { "creatorType": "author", "firstName": "J.", "lastName": "Jonkman" }, { "creatorType": "author", "firstName": "J.", "lastName": "Michalakes" } ], "abstractNote": "Large-eddy simulations of atmospheric boundary layers under various stability and surface roughness conditions are performed to investigate the turbulence impact on wind turbines. In particular, the aeroelastic responses of the turbines are studied to characterize the fatigue loading of the turbulence present in the boundary layer and in the wake of the turbines. Two utility-scale 5 MW turbines that are separated by seven rotor diameters are placed in a 3 km by 3 km by 1 km domain. They are subjected to atmospheric turbulent boundary layer flow and data are collected on the structural response of the turbine components. The surface roughness was found to increase the fatigue loads while the atmospheric instability had a small influence. Furthermore, the downstream turbines yielded higher fatigue loads indicating that the turbulent wakes generated from the upstream turbines have significant impact.", "publicationTitle": "Journal of Solar Energy Engineering", "publisher": "", "place": "", "date": "February 8, 2013", "volume": "135", "issue": "3", "section": "", "partNumber": "", "partTitle": "", "pages": "031001-031001", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "J. Sol. Energy Eng.", "DOI": "10.1115/1.4023319", "citationKey": "", "url": "http://dx.doi.org/10.1115/1.4023319", "accessDate": "2013-10-08T15:10:39Z", "PMID": "", "PMCID": "", "ISSN": "0199-6231", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "Silverchair", "callNumber": "", "rights": "", "extra": "", "tags": [], "collections": [ "9JNR72SZ" ], "relations": {}, "dateAdded": "2013-10-08T15:10:39Z", "dateModified": "2013-10-08T15:10:39Z" } }, { "key": "Z4EMF7CU", "version": 403, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/Z4EMF7CU", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/Z4EMF7CU", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Clifton et al.", "parsedDate": "2013-05-31", "numChildren": 0 }, "data": { "key": "Z4EMF7CU", "version": 403, "itemType": "journalArticle", "title": "Turbine Inflow Characterization at the National Wind Technology Center", "creators": [ { "creatorType": "author", "firstName": "Andrew", "lastName": "Clifton" }, { "creatorType": "author", "firstName": "Scott", "lastName": "Schreck" }, { "creatorType": "author", "firstName": "George", "lastName": "Scott" }, { "creatorType": "author", "firstName": "Neil", "lastName": "Kelley" }, { "creatorType": "author", "firstName": "Julie K.", "lastName": "Lundquist" } ], "abstractNote": "Utility-scale wind turbines operate in dynamic flows that can vary significantly over time scales from less than a second to several years. To better understand the inflow to utility-scale turbines on time scales from seconds to minutes, the National Renewable Energy Laboratory installed and commissioned two inflow measurement towers at the National Wind Technology Center near Boulder, Colorado, in 2011. These towers are 135 m tall and instrumented with sonic anemometers, cup anemometers, wind vanes, and temperature measurements to characterize the inflow wind speed and direction, turbulence, stability and thermal stratification for two utility-scale turbines. In this paper, we present variations in mean and turbulent wind parameters with height, atmospheric stability, and as a function of wind direction that could be important for turbine operation, and for the persistence of turbine wakes. Wind speed, turbulence intensity, and dissipation are all factors that affect turbine performance. Our results show that these all vary with height across the rotor disk, demonstrating the importance of measuring atmospheric conditions that influence wind turbine performance at multiple heights in the rotor disk, rather than relying on extrapolation from conditions measured at lower levels.", "publicationTitle": "Journal of Solar Energy Engineering", "publisher": "", "place": "", "date": "May 31, 2013", "volume": "135", "issue": "3", "section": "", "partNumber": "", "partTitle": "", "pages": "031017-031017", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "J. Sol. Energy Eng.", "DOI": "10.1115/1.4024068", "citationKey": "", "url": "http://dx.doi.org/10.1115/1.4024068", "accessDate": "2013-10-08T15:10:06Z", "PMID": "", "PMCID": "", "ISSN": "0199-6231", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "Silverchair", "callNumber": "", "rights": "", "extra": "", "tags": [], "collections": [ "9JNR72SZ" ], "relations": {}, "dateAdded": "2013-10-08T15:10:06Z", "dateModified": "2013-10-08T15:10:06Z" } }, { "key": "KPVRRAV4", "version": 402, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/KPVRRAV4", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/KPVRRAV4", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Kragh et al.", "parsedDate": "2013-06-11", "numChildren": 0 }, "data": { "key": "KPVRRAV4", "version": 402, "itemType": "journalArticle", "title": "Increased Power Capture by Rotor Speed–Dependent Yaw Control of Wind Turbines", "creators": [ { "creatorType": "author", "firstName": "Knud A.", "lastName": "Kragh" }, { "creatorType": "author", "firstName": "Paul A.", "lastName": "Fleming" }, { "creatorType": "author", "firstName": "Andrew K.", "lastName": "Scholbrock" } ], "abstractNote": "When extracting energy from the wind using upwind, horizontal-axis wind turbines, a primary condition for ensuring maximum power yield is the ability to align the rotor axis with the dominating wind direction. Attempts have been made to improve the yaw alignment of wind turbines by applying advanced measurement technologies, such as light detection and ranging systems. However, application of advanced measurement equipment is associated with additional costs and increased system complexity. This study is focused on assessing the current performance of an operating turbine and exploring how the yaw alignment can be improved using measurements from the existing standard measurements system. By analyzing data from a case turbine and a corresponding meteorological mast, a correction scheme for the original yaw control system is suggested. The correction scheme is applied to the case turbine and tested. Results show that, with the correction scheme in place, the yaw alignment of the case turbine is improved and the yaw error is reduced to the vicinity of zero degrees. As a result of the improved yaw alignment, an increased power capture is observed for below-rated wind speeds.", "publicationTitle": "Journal of Solar Energy Engineering", "publisher": "", "place": "", "date": "June 11, 2013", "volume": "135", "issue": "3", "section": "", "partNumber": "", "partTitle": "", "pages": "031018-031018", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "J. Sol. Energy Eng.", "DOI": "10.1115/1.4023971", "citationKey": "", "url": "http://dx.doi.org/10.1115/1.4023971", "accessDate": "2013-10-08T15:09:39Z", "PMID": "", "PMCID": "", "ISSN": "0199-6231", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "Silverchair", "callNumber": "", "rights": "", "extra": "", "tags": [], "collections": [ "9JNR72SZ" ], "relations": {}, "dateAdded": "2013-10-08T15:09:39Z", "dateModified": "2013-10-08T15:09:39Z" } }, { "key": "I6JUKBKH", "version": 401, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/I6JUKBKH", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/I6JUKBKH", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Hand et al.", "parsedDate": "2012-05-17", "numChildren": 0 }, "data": { "key": "I6JUKBKH", "version": 401, "itemType": "presentation", "title": "Renewable Electricity Futures: Exploration of up to 80% Renewable Electrcity Penetration in the United States", "creators": [ { "creatorType": "presenter", "firstName": "M.", "lastName": "Hand" }, { "creatorType": "presenter", "firstName": "E.", "lastName": "DeMeo" }, { "creatorType": "presenter", "firstName": "D.", "lastName": "Hostick" }, { "creatorType": "presenter", "firstName": "T.", "lastName": "Mai" }, { "creatorType": "presenter", "firstName": "C.A.", "lastName": "Schlosser" } ], "abstractNote": "", "presentationType": "", "date": "May 17, 2012", "meetingName": "World Renewable Energy Forum", "place": "Denver, CO", "series": "", "sessionTitle": "", "DOI": "", "citationKey": "", "url": "http://www.nrel.gov/docs/fy13osti/54948.pdf", "accessDate": "", "shortTitle": "", "language": "", "rights": "", "extra": "", "tags": [], "collections": [ "VIZDIKV3" ], "relations": {}, "dateAdded": "2013-04-19T14:14:39Z", "dateModified": "2013-10-08T02:06:07Z" } }, { "key": "AU3GWSB6", "version": 400, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/AU3GWSB6", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/AU3GWSB6", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Diakov", "parsedDate": "2012-12", "numChildren": 0 }, "data": { "key": "AU3GWSB6", "version": 400, "itemType": "journalArticle", "title": "Angle on Solar and Wind Variability", "creators": [ { "creatorType": "author", "firstName": "V.", "lastName": "Diakov" } ], "abstractNote": "", "publicationTitle": "Solar Today", "publisher": "", "place": "", "date": "November/December 2012", "volume": "26", "issue": "7", "section": "", "partNumber": "", "partTitle": "", "pages": "30-33", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://ases.org/solar-today-magazine", "accessDate": "", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "", "rights": "", "extra": "", "tags": [], "collections": [ "PDEFBKXT" ], "relations": {}, "dateAdded": "2012-12-12T17:43:16Z", "dateModified": "2013-10-08T02:01:38Z" } }, { "key": "9ZEQNK9J", "version": 399, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/9ZEQNK9J", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/9ZEQNK9J", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Mendoza and Hur", "parsedDate": "2013-01", "numChildren": 0 }, "data": { "key": "9ZEQNK9J", "version": 399, "itemType": "report", "title": "Duration Test Report for the SWIFT Wind Turbine", "creators": [ { "creatorType": "author", "firstName": "I.", "lastName": "Mendoza" }, { "creatorType": "author", "firstName": "J.", "lastName": "Hur" } ], "abstractNote": "", "reportNumber": "NREL/TP-5000-57126", "reportType": "", "institution": "National Renewable Energy Laboratory", "place": "Golden, CO", "date": "January 2013", "seriesTitle": "", "seriesNumber": "", "pages": "55", "DOI": "", "ISBN": "", "citationKey": "", "url": "http://www.nrel.gov/docs/fy13osti/57126.pdf", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "", "rights": "", "extra": "", "tags": [], "collections": [ "BFFMWPMN" ], "relations": {}, "dateAdded": "2013-02-26T20:11:36Z", "dateModified": "2013-10-08T01:45:07Z" } }, { "key": "AZTTTPT5", "version": 398, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/AZTTTPT5", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/AZTTTPT5", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Florita et al.", "parsedDate": "2013-01", "numChildren": 0 }, "data": { "key": "AZTTTPT5", "version": 398, "itemType": "report", "title": "Identifying Wind and Solar Ramping Events", "creators": [ { "creatorType": "author", "firstName": "A.", "lastName": "Florita" }, { "creatorType": "author", "firstName": "B.-M.", "lastName": "Hodge" }, { "creatorType": "author", "firstName": "K.", "lastName": "Orwig" } ], "abstractNote": "", "reportNumber": "NREL/CP-5500-57447", "reportType": "", "institution": "National Renewable Energy Laboratory", "place": "Golden, CO", "date": "January 2013", "seriesTitle": "", "seriesNumber": "", "pages": "8", "DOI": "", "ISBN": "", "citationKey": "", "url": "http://www.nrel.gov/docs/fy13osti/57447.pdf", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "", "rights": "", "extra": "To be presented at the IEEE Green Technologies Conference Denver, Colorado April 4–5, 2013", "tags": [], "collections": [ "BFFMWPMN" ], "relations": {}, "dateAdded": "2013-02-26T20:13:26Z", "dateModified": "2013-10-08T01:39:05Z" } }, { "key": "T9W9JHKZ", "version": 397, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/T9W9JHKZ", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/T9W9JHKZ", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Pennock", "parsedDate": "2012-10", "numChildren": 0 }, "data": { "key": "T9W9JHKZ", "version": 397, "itemType": "report", "title": "Updated Eastern Interconnect Wind Power Output and Forecasts for ERGIS: July 2012", "creators": [ { "creatorType": "author", "firstName": "K.", "lastName": "Pennock" } ], "abstractNote": "AWS Truepower, LLC (AWST) was retained by the National Renewable Energy Laboratory (NREL) to update wind resource, plant output, and wind power forecasts originally produced by the Eastern Wind Integration and Transmission Study (EWITS). The new data set was to incorporate AWST's updated 200-m wind speed map, additional tall towers that were not included in the original study, and new turbine power curves. Additionally, a primary objective of this new study was to employ new data synthesis techniques developed for the PJM Renewable Integration Study (PRIS) to eliminate diurnal discontinuities resulting from the assimilation of observations into mesoscale model runs. The updated data set covers the same geographic area, 10-minute time resolution, and 2004?2006 study period for the same onshore and offshore (Great Lakes and Atlantic coast) sites as the original EWITS data set.", "reportNumber": "NREL/SR-5500-56616", "reportType": "Subcontract Report", "institution": "National Renewable Energy Laboratory", "place": "Golden, CO", "date": "October 2012", "seriesTitle": "", "seriesNumber": "", "pages": "21", "DOI": "", "ISBN": "", "citationKey": "", "url": "http://www.nrel.gov/docs/fy13osti/56616.pdf", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "", "rights": "", "extra": "Work performed by AWS Truepower, Albany, New York.", "tags": [], "collections": [ "I9U6WR2N" ], "relations": {}, "dateAdded": "2012-12-12T15:48:16Z", "dateModified": "2013-10-08T01:24:20Z" } }, { "key": "5MQABHIR", "version": 396, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/5MQABHIR", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/5MQABHIR", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Koh et al.", "parsedDate": "2013-09", "numChildren": 0 }, "data": { "key": "5MQABHIR", "version": 396, "itemType": "report", "title": "Building and Calibration of a FAST Model of the SWAY Prototype Floating Wind Turbine: Preprint", "creators": [ { "creatorType": "author", "firstName": "J.H.", "lastName": "Koh" }, { "creatorType": "author", "firstName": "A.", "lastName": "Robertson" }, { "creatorType": "author", "firstName": "J.", "lastName": "Jonkman" }, { "creatorType": "author", "firstName": "F.", "lastName": "Driscoll" }, { "creatorType": "author", "firstName": "E.Y.K.", "lastName": "Ng" } ], "abstractNote": "", "reportNumber": "NREL/CP-5000-60096", "reportType": "", "institution": "National Renewable Energy Laboratory", "place": "Golden, CO", "date": "September 2013", "seriesTitle": "", "seriesNumber": "", "pages": "9", "DOI": "", "ISBN": "", "citationKey": "", "url": "http://www.nrel.gov/docs/fy13osti/60096.pdf", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "", "rights": "", "extra": "To be presented at the International Conference on Renewable Energy Research and Applications (ICRERA)\nMadrid, Spain October 20−23, 2013", "tags": [], "collections": [ "F2INFGX9", "W654P26D" ], "relations": {}, "dateAdded": "2013-10-08T00:51:56Z", "dateModified": "2013-10-08T00:59:59Z" } }, { "key": "4EPUHTND", "version": 387, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/130781/items/4EPUHTND", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs/items/4EPUHTND", "type": "text/html" } }, "meta": { "createdByUser": { "id": 250494, "username": "tsandberg", "name": "Tami Sandberg", "links": { "alternate": { "href": "https://www.zotero.org/tsandberg", "type": "text/html" } } }, "creatorSummary": "Sinclair", "parsedDate": "2013-06", "numChildren": 0 }, "data": { "key": "4EPUHTND", "version": 387, "itemType": "report", "title": "Building Toward a Small Wind Turbine Site Assessor Credential (Presentation)", "creators": [ { "creatorType": "author", "firstName": "K.", "lastName": "Sinclair" } ], "abstractNote": "", "reportNumber": "NREL/PR-5000-60183", "reportType": "", "institution": "National Renewable Energy Laboratory", "place": "Golden, CO", "date": "June 2013", "seriesTitle": "", "seriesNumber": "", "pages": "12", "DOI": "", "ISBN": "", "citationKey": "", "url": "http://www.nrel.gov/docs/fy13osti/60183.pdf", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "", "rights": "", "extra": "Presented at the Small Wind Installers Conference 2013, Stevens Point, Wisconsin, 18 June 2013", "tags": [], "collections": [ "F2INFGX9" ], "relations": {}, "dateAdded": "2013-10-08T00:47:02Z", "dateModified": "2013-10-08T00:49:59Z" } }, { "key": "7BA84UTE", "version": 380, "library": { "type": "group", "id": 130781, "name": "NREL_WindandWaterPubs", "links": { "alternate": { "href": "https://www.zotero.org/groups/nrel_windandwaterpubs", "type": "text/html" } } }, "links": { "self": { "href": 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